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Merge pull request #484 from jackhumbert/lets-split-support

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Add Let's Split support
pull/494/head
Jack Humbert 9 years ago committed by GitHub
parent 5baaf871bb a4bf46f9b1
commit 21e443101f
22 changed files with 1807 additions and 18 deletions
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1
keyboards/atreus/Makefile
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@ -5,6 +5,7 @@ ifdef TEENSY2
ATRUES_UPLOAD_COMMAND = teensy_loader_cli -w -mmcu=$(MCU) $(TARGET).hex ATRUES_UPLOAD_COMMAND = teensy_loader_cli -w -mmcu=$(MCU) $(TARGET).hex
else else
OPT_DEFS += -DATREUS_ASTAR OPT_DEFS += -DATREUS_ASTAR
OPT_DEFS += -DCATERINA_BOOTLOADER
ATRUES_UPLOAD_COMMAND = while [ ! -r $(USB) ]; do sleep 1; done; \ ATRUES_UPLOAD_COMMAND = while [ ! -r $(USB) ]; do sleep 1; done; \
avrdude -p $(MCU) -c avr109 -U flash:w:$(TARGET).hex -P $(USB) avrdude -p $(MCU) -c avr109 -U flash:w:$(TARGET).hex -P $(USB)
endif endif

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keyboards/lets_split/Makefile
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SRC += matrix.c \
i2c.c \
split_util.c \
serial.c
# MCU name
#MCU = at90usb1287
MCU = atmega32u4
# Processor frequency.
# This will define a symbol, F_CPU, in all source code files equal to the
# processor frequency in Hz. You can then use this symbol in your source code to
# calculate timings. Do NOT tack on a 'UL' at the end, this will be done
# automatically to create a 32-bit value in your source code.
#
# This will be an integer division of F_USB below, as it is sourced by
# F_USB after it has run through any CPU prescalers. Note that this value
# does not *change* the processor frequency - it should merely be updated to
# reflect the processor speed set externally so that the code can use accurate
# software delays.
F_CPU = 16000000
#
# LUFA specific
#
# Target architecture (see library "Board Types" documentation).
ARCH = AVR8
# Input clock frequency.
# This will define a symbol, F_USB, in all source code files equal to the
# input clock frequency (before any prescaling is performed) in Hz. This value may
# differ from F_CPU if prescaling is used on the latter, and is required as the
# raw input clock is fed directly to the PLL sections of the AVR for high speed
# clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
# at the end, this will be done automatically to create a 32-bit value in your
# source code.
#
# If no clock division is performed on the input clock inside the AVR (via the
# CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
F_USB = $(F_CPU)
# Interrupt driven control endpoint task(+60)
OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
# Boot Section Size in *bytes*
# Teensy halfKay 512
# Teensy++ halfKay 1024
# Atmel DFU loader 4096
# LUFA bootloader 4096
# USBaspLoader 2048
OPT_DEFS += -DBOOTLOADER_SIZE=4096
# Build Options
# change to "no" to disable the options, or define them in the Makefile in
# the appropriate keymap folder that will get included automatically
#
BOOTMAGIC_ENABLE ?= no # Virtual DIP switch configuration(+1000)
MOUSEKEY_ENABLE ?= yes # Mouse keys(+4700)
EXTRAKEY_ENABLE ?= yes # Audio control and System control(+450)
CONSOLE_ENABLE ?= no # Console for debug(+400)
COMMAND_ENABLE ?= yes # Commands for debug and configuration
NKRO_ENABLE ?= no # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
BACKLIGHT_ENABLE ?= no # Enable keyboard backlight functionality
MIDI_ENABLE ?= no # MIDI controls
AUDIO_ENABLE ?= yes # Audio output on port C6
UNICODE_ENABLE ?= no # Unicode
BLUETOOTH_ENABLE ?= no # Enable Bluetooth with the Adafruit EZ-Key HID
RGBLIGHT_ENABLE ?= no # Enable WS2812 RGB underlight. Do not enable this with audio at the same time.
# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE ?= no # Breathing sleep LED during USB suspend
CUSTOM_MATRIX = yes
ifndef QUANTUM_DIR
include ../../Makefile
endif

98
keyboards/lets_split/config.h
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/*
Copyright 2012 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CONFIG_H
#define CONFIG_H
#include "config_common.h"
/* USB Device descriptor parameter */
#define VENDOR_ID 0xFEED
#define PRODUCT_ID 0x3060
#define DEVICE_VER 0x0001
#define MANUFACTURER Wootpatoot
#define PRODUCT Lets Split
#define DESCRIPTION A split keyboard for the cheap makers
/* key matrix size */
// Rows are doubled-up
#define MATRIX_ROWS 8
#define MATRIX_COLS 6
// wiring of each half
#define MATRIX_ROW_PINS { B5, B4, E6, D7 }
#define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
#define CATERINA_BOOTLOADER
// #define USE_I2C
// #define EE_HANDS
#define I2C_MASTER_LEFT
// #define I2C_MASTER_RIGHT
/* COL2ROW or ROW2COL */
#define DIODE_DIRECTION COL2ROW
/* define if matrix has ghost */
//#define MATRIX_HAS_GHOST
/* number of backlight levels */
// #define BACKLIGHT_LEVELS 3
/* Set 0 if debouncing isn't needed */
#define DEBOUNCING_DELAY 5
/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
#define LOCKING_SUPPORT_ENABLE
/* Locking resynchronize hack */
#define LOCKING_RESYNC_ENABLE
/* key combination for command */
#define IS_COMMAND() ( \
keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
)
/* ws2812 RGB LED */
#define ws2812_PORTREG PORTD
#define ws2812_DDRREG DDRD
#define ws2812_pin PD1
#define RGBLED_NUM 28 // Number of LEDs
#define RGBLIGHT_HUE_STEP 10
#define RGBLIGHT_SAT_STEP 17
#define RGBLIGHT_VAL_STEP 17
/*
* Feature disable options
* These options are also useful to firmware size reduction.
*/
/* disable debug print */
// #define NO_DEBUG
/* disable print */
// #define NO_PRINT
/* disable action features */
//#define NO_ACTION_LAYER
//#define NO_ACTION_TAPPING
//#define NO_ACTION_ONESHOT
//#define NO_ACTION_MACRO
//#define NO_ACTION_FUNCTION
#endif

2
keyboards/lets_split/eeprom-lefthand.eep
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:080000000000000000000001F7
:00000001FF

2
keyboards/lets_split/eeprom-righthand.eep
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:080000000000000000000000F8
:00000001FF

159
keyboards/lets_split/i2c.c
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#include <util/twi.h>
#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <util/twi.h>
#include <stdbool.h>
#include "i2c.h"
// Limits the amount of we wait for any one i2c transaction.
// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
// 9 bits, a single transaction will take around 90μs to complete.
//
// (F_CPU/SCL_CLOCK) => # of μC cycles to transfer a bit
// poll loop takes at least 8 clock cycles to execute
#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8
#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)
volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
static volatile uint8_t slave_buffer_pos;
static volatile bool slave_has_register_set = false;
// Wait for an i2c operation to finish
inline static
void i2c_delay(void) {
uint16_t lim = 0;
while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
lim++;
// easier way, but will wait slightly longer
// _delay_us(100);
}
// Setup twi to run at 100kHz
void i2c_master_init(void) {
// no prescaler
TWSR = 0;
// Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
// Check datasheets for more info.
TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
}
// Start a transaction with the given i2c slave address. The direction of the
// transfer is set with I2C_READ and I2C_WRITE.
// returns: 0 => success
// 1 => error
uint8_t i2c_master_start(uint8_t address) {
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
i2c_delay();
// check that we started successfully
if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
return 1;
TWDR = address;
TWCR = (1<<TWINT) | (1<<TWEN);
i2c_delay();
if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
return 1; // slave did not acknowledge
else
return 0; // success
}
// Finish the i2c transaction.
void i2c_master_stop(void) {
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
uint16_t lim = 0;
while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
lim++;
}
// Write one byte to the i2c slave.
// returns 0 => slave ACK
// 1 => slave NACK
uint8_t i2c_master_write(uint8_t data) {
TWDR = data;
TWCR = (1<<TWINT) | (1<<TWEN);
i2c_delay();
// check if the slave acknowledged us
return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
}
// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
// if ack=0 the acknowledge bit is not set.
// returns: byte read from i2c device
uint8_t i2c_master_read(int ack) {
TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);
i2c_delay();
return TWDR;
}
void i2c_reset_state(void) {
TWCR = 0;
}
void i2c_slave_init(uint8_t address) {
TWAR = address << 0; // slave i2c address
// TWEN - twi enable
// TWEA - enable address acknowledgement
// TWINT - twi interrupt flag
// TWIE - enable the twi interrupt
TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
}
ISR(TWI_vect);
ISR(TWI_vect) {
uint8_t ack = 1;
switch(TW_STATUS) {
case TW_SR_SLA_ACK:
// this device has been addressed as a slave receiver
slave_has_register_set = false;
break;
case TW_SR_DATA_ACK:
// this device has received data as a slave receiver
// The first byte that we receive in this transaction sets the location
// of the read/write location of the slaves memory that it exposes over
// i2c. After that, bytes will be written at slave_buffer_pos, incrementing
// slave_buffer_pos after each write.
if(!slave_has_register_set) {
slave_buffer_pos = TWDR;
// don't acknowledge the master if this memory loctaion is out of bounds
if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
ack = 0;
slave_buffer_pos = 0;
}
slave_has_register_set = true;
} else {
i2c_slave_buffer[slave_buffer_pos] = TWDR;
BUFFER_POS_INC();
}
break;
case TW_ST_SLA_ACK:
case TW_ST_DATA_ACK:
// master has addressed this device as a slave transmitter and is
// requesting data.
TWDR = i2c_slave_buffer[slave_buffer_pos];
BUFFER_POS_INC();
break;
case TW_BUS_ERROR: // something went wrong, reset twi state
TWCR = 0;
default:
break;
}
// Reset everything, so we are ready for the next TWI interrupt
TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
}

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keyboards/lets_split/i2c.h
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#ifndef I2C_H
#define I2C_H
#include <stdint.h>
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
#define I2C_READ 1
#define I2C_WRITE 0
#define I2C_ACK 1
#define I2C_NACK 0
#define SLAVE_BUFFER_SIZE 0x10
// i2c SCL clock frequency
#define SCL_CLOCK 100000L
extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
void i2c_master_init(void);
uint8_t i2c_master_start(uint8_t address);
void i2c_master_stop(void);
uint8_t i2c_master_write(uint8_t data);
uint8_t i2c_master_read(int);
void i2c_reset_state(void);
void i2c_slave_init(uint8_t address);
#endif

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keyboards/lets_split/imgs/split-keyboard-i2c-schematic.png
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keyboards/lets_split/imgs/split-keyboard-serial-schematic.png
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keyboards/lets_split/keymaps/default/keymap.c
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#include "lets_split.h"
#include "action_layer.h"
#include "eeconfig.h"
extern keymap_config_t keymap_config;
// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.
#define _QWERTY 0
#define _COLEMAK 1
#define _DVORAK 2
#define _LOWER 3
#define _RAISE 4
#define _ADJUST 16
enum custom_keycodes {
QWERTY = SAFE_RANGE,
COLEMAK,
DVORAK,
LOWER,
RAISE,
ADJUST,
};
// Fillers to make layering more clear
#define _______ KC_TRNS
#define XXXXXXX KC_NO
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
/* Qwerty
* ,-----------------------------------------------------------------------------------.
* | Tab | Q | W | E | R | T | Y | U | I | O | P | Bksp |
* |------+------+------+------+------+-------------+------+------+------+------+------|
* | Esc | A | S | D | F | G | H | J | K | L | ; | " |
* |------+------+------+------+------+------|------+------+------+------+------+------|
* | Shift| Z | X | C | V | B | N | M | , | . | / |Enter |
* |------+------+------+------+------+------+------+------+------+------+------+------|
* |Adjust| Ctrl | Alt | GUI |Lower |Space |Space |Raise | Left | Down | Up |Right |
* `-----------------------------------------------------------------------------------'
*/
[_QWERTY] = KEYMAP( \
KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSPC, \
KC_ESC, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, \
KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_ENT , \
ADJUST, KC_LCTL, KC_LALT, KC_LGUI, LOWER, KC_SPC, KC_SPC, RAISE, KC_LEFT, KC_DOWN, KC_UP, KC_RGHT \
),
/* Colemak
* ,-----------------------------------------------------------------------------------.
* | Tab | Q | W | F | P | G | J | L | U | Y | ; | Bksp |
* |------+------+------+------+------+-------------+------+------+------+------+------|
* | Esc | A | R | S | T | D | H | N | E | I | O | " |
* |------+------+------+------+------+------|------+------+------+------+------+------|
* | Shift| Z | X | C | V | B | K | M | , | . | / |Enter |
* |------+------+------+------+------+------+------+------+------+------+------+------|
* |Adjust| Ctrl | Alt | GUI |Lower |Space |Space |Raise | Left | Down | Up |Right |
* `-----------------------------------------------------------------------------------'
*/
[_COLEMAK] = KEYMAP( \
KC_TAB, KC_Q, KC_W, KC_F, KC_P, KC_G, KC_J, KC_L, KC_U, KC_Y, KC_SCLN, KC_BSPC, \
KC_ESC, KC_A, KC_R, KC_S, KC_T, KC_D, KC_H, KC_N, KC_E, KC_I, KC_O, KC_QUOT, \
KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_K, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_ENT , \
ADJUST, KC_LCTL, KC_LALT, KC_LGUI, LOWER, KC_SPC, KC_SPC, RAISE, KC_LEFT, KC_DOWN, KC_UP, KC_RGHT \
),
/* Dvorak
* ,-----------------------------------------------------------------------------------.
* | Tab | " | , | . | P | Y | F | G | C | R | L | Bksp |
* |------+------+------+------+------+-------------+------+------+------+------+------|
* | Esc | A | O | E | U | I | D | H | T | N | S | / |
* |------+------+------+------+------+------|------+------+------+------+------+------|
* | Shift| ; | Q | J | K | X | B | M | W | V | Z |Enter |
* |------+------+------+------+------+------+------+------+------+------+------+------|
* |Adjust| Ctrl | Alt | GUI |Lower |Space |Space |Raise | Left | Down | Up |Right |
* `-----------------------------------------------------------------------------------'
*/
[_DVORAK] = KEYMAP( \
KC_TAB, KC_QUOT, KC_COMM, KC_DOT, KC_P, KC_Y, KC_F, KC_G, KC_C, KC_R, KC_L, KC_BSPC, \
KC_ESC, KC_A, KC_O, KC_E, KC_U, KC_I, KC_D, KC_H, KC_T, KC_N, KC_S, KC_SLSH, \
KC_LSFT, KC_SCLN, KC_Q, KC_J, KC_K, KC_X, KC_B, KC_M, KC_W, KC_V, KC_Z, KC_ENT , \
ADJUST, KC_LCTL, KC_LALT, KC_LGUI, LOWER, KC_SPC, KC_SPC, RAISE, KC_LEFT, KC_DOWN, KC_UP, KC_RGHT \
),
/* Lower
* ,-----------------------------------------------------------------------------------.
* | ~ | ! | @ | # | $ | % | ^ | & | * | ( | ) | Bksp |
* |------+------+------+------+------+-------------+------+------+------+------+------|
* | Del | F1 | F2 | F3 | F4 | F5 | F6 | _ | + | | \ | | |
* |------+------+------+------+------+------|------+------+------+------+------+------|
* | | F7 | F8 | F9 | F10 | F11 | F12 |ISO ~ |ISO | | | |Enter |
* |------+------+------+------+------+------+------+------+------+------+------+------|
* | | | | | | | | Next | Vol- | Vol+ | Play |
* `-----------------------------------------------------------------------------------'
*/
[_LOWER] = KEYMAP( \
KC_TILD, KC_EXLM, KC_AT, KC_HASH, KC_DLR, KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC, \
KC_DEL, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE, \
_______, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12,S(KC_NUHS),S(KC_NUBS),_______, _______, _______, \
_______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY \
),
/* Raise
* ,-----------------------------------------------------------------------------------.
* | ` | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | Bksp |
* |------+------+------+------+------+-------------+------+------+------+------+------|
* | Del | F1 | F2 | F3 | F4 | F5 | F6 | - | = | [ | ] | \ |
* |------+------+------+------+------+------|------+------+------+------+------+------|
* | | F7 | F8 | F9 | F10 | F11 | F12 |ISO # |ISO / | | |Enter |
* |------+------+------+------+------+------+------+------+------+------+------+------|
* | | | | | | | | Next | Vol- | Vol+ | Play |
* `-----------------------------------------------------------------------------------'
*/
[_RAISE] = KEYMAP( \
KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_BSPC, \
KC_DEL, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_MINS, KC_EQL, KC_LBRC, KC_RBRC, KC_BSLS, \
_______, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_NUHS, KC_NUBS, _______, _______, _______, \
_______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY \
),
/* Adjust (Lower + Raise)
* ,-----------------------------------------------------------------------------------.
* | | Reset| | | | | | | | | | Del |
* |------+------+------+------+------+-------------+------+------+------+------+------|
* | | | |Aud on|Audoff|AGnorm|AGswap|Qwerty|Colemk|Dvorak| | |
* |------+------+------+------+------+------|------+------+------+------+------+------|
* | | | | | | | | | | | | |
* |------+------+------+------+------+------+------+------+------+------+------+------|
* | | | | | | | | | | | |
* `-----------------------------------------------------------------------------------'
*/
[_ADJUST] = KEYMAP( \
_______, RESET, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_DEL, \
_______, _______, _______, AU_ON, AU_OFF, AG_NORM, AG_SWAP, QWERTY, COLEMAK, DVORAK, _______, _______, \
_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, \
_______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______ \
)
};
#ifdef AUDIO_ENABLE
float tone_qwerty[][2] = SONG(QWERTY_SOUND);
float tone_dvorak[][2] = SONG(DVORAK_SOUND);
float tone_colemak[][2] = SONG(COLEMAK_SOUND);
#endif
void persistant_default_layer_set(uint16_t default_layer) {
eeconfig_update_default_layer(default_layer);
default_layer_set(default_layer);
}
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
switch (keycode) {
case QWERTY:
if (record->event.pressed) {
#ifdef AUDIO_ENABLE
PLAY_NOTE_ARRAY(tone_qwerty, false, 0);
#endif
persistant_default_layer_set(1UL<<_QWERTY);
}
return false;
break;
case COLEMAK:
if (record->event.pressed) {
#ifdef AUDIO_ENABLE
PLAY_NOTE_ARRAY(tone_colemak, false, 0);
#endif
persistant_default_layer_set(1UL<<_COLEMAK);
}
return false;
break;
case DVORAK:
if (record->event.pressed) {
#ifdef AUDIO_ENABLE
PLAY_NOTE_ARRAY(tone_dvorak, false, 0);
#endif
persistant_default_layer_set(1UL<<_DVORAK);
}
return false;
break;
case LOWER:
if (record->event.pressed) {
layer_on(_LOWER);
update_tri_layer(_LOWER, _RAISE, _ADJUST);
} else {
layer_off(_LOWER);
update_tri_layer(_LOWER, _RAISE, _ADJUST);
}
return false;
break;
case RAISE:
if (record->event.pressed) {
layer_on(_RAISE);
update_tri_layer(_LOWER, _RAISE, _ADJUST);
} else {
layer_off(_RAISE);
update_tri_layer(_LOWER, _RAISE, _ADJUST);
}
return false;
break;
case ADJUST:
if (record->event.pressed) {
layer_on(_ADJUST);
} else {
layer_off(_ADJUST);
}
return false;
break;
}
return true;
}

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keyboards/lets_split/lets_split.c
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#include "lets_split.h"
#ifdef AUDIO_ENABLE
float tone_startup[][2] = SONG(STARTUP_SOUND);
float tone_goodbye[][2] = SONG(GOODBYE_SOUND);
#endif
void matrix_init_kb(void) {
#ifdef AUDIO_ENABLE
_delay_ms(20); // gets rid of tick
PLAY_NOTE_ARRAY(tone_startup, false, 0);
#endif
// // green led on
// DDRD |= (1<<5);
// PORTD &= ~(1<<5);
// // orange led on
// DDRB |= (1<<0);
// PORTB &= ~(1<<0);
matrix_init_user();
};
void shutdown_user(void) {
PLAY_NOTE_ARRAY(tone_goodbye, false, 0);
_delay_ms(150);
stop_all_notes();
}

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#ifndef LETS_SPLIT_H
#define LETS_SPLIT_H
#include "quantum.h"
void promicro_bootloader_jmp(bool program);
#define KEYMAP( \
k00, k01, k02, k03, k04, k05, k40, k41, k42, k43, k44, k45, \
k10, k11, k12, k13, k14, k15, k50, k51, k52, k53, k54, k55, \
k20, k21, k22, k23, k24, k25, k60, k61, k62, k63, k64, k65, \
k30, k31, k32, k33, k34, k35, k70, k71, k72, k73, k74, k75 \
) \
{ \
{ k00, k01, k02, k03, k04, k05 }, \
{ k10, k11, k12, k13, k14, k15 }, \
{ k20, k21, k22, k23, k24, k25 }, \
{ k30, k31, k32, k33, k34, k35 }, \
{ k40, k41, k42, k43, k44, k45 }, \
{ k50, k51, k52, k53, k54, k55 }, \
{ k60, k61, k62, k63, k64, k65 }, \
{ k70, k71, k72, k73, k74, k75 } \
}
#endif

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/*
Copyright 2012 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* scan matrix
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "i2c.h"
#include "serial.h"
#include "split_util.h"
#include "pro_micro.h"
#include "config.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
#define ERROR_DISCONNECT_COUNT 5
static uint8_t debouncing = DEBOUNCE;
static const int ROWS_PER_HAND = MATRIX_ROWS/2;
static uint8_t error_count = 0;
static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static matrix_row_t read_cols(void);
static void init_cols(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
__attribute__ ((weak))
void matrix_init_quantum(void) {
matrix_init_kb();
}
__attribute__ ((weak))
void matrix_scan_quantum(void) {
matrix_scan_kb();
}
__attribute__ ((weak))
void matrix_init_kb(void) {
matrix_init_user();
}
__attribute__ ((weak))
void matrix_scan_kb(void) {
matrix_scan_user();
}
__attribute__ ((weak))
void matrix_init_user(void) {
}
__attribute__ ((weak))
void matrix_scan_user(void) {
}
inline
uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
void matrix_init(void)
{
debug_enable = true;
debug_matrix = true;
debug_mouse = true;
// initialize row and col
unselect_rows();
init_cols();
TX_RX_LED_INIT;
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
matrix_init_quantum();
}
uint8_t _matrix_scan(void)
{
// Right hand is stored after the left in the matirx so, we need to offset it
int offset = isLeftHand ? 0 : (ROWS_PER_HAND);
for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
select_row(i);
_delay_us(30); // without this wait read unstable value.
matrix_row_t cols = read_cols();
if (matrix_debouncing[i+offset] != cols) {
matrix_debouncing[i+offset] = cols;
debouncing = DEBOUNCE;
}
unselect_rows();
}
if (debouncing) {
if (--debouncing) {
_delay_ms(1);
} else {
for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
matrix[i+offset] = matrix_debouncing[i+offset];
}
}
}
return 1;
}
// Get rows from other half over i2c
int i2c_transaction(void) {
int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
if (err) goto i2c_error;
// start of matrix stored at 0x00
err = i2c_master_write(0x00);
if (err) goto i2c_error;
// Start read
err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
if (err) goto i2c_error;
if (!err) {
int i;
for (i = 0; i < ROWS_PER_HAND-1; ++i) {
matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
}
matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
i2c_master_stop();
} else {
i2c_error: // the cable is disconnceted, or something else went wrong
i2c_reset_state();
return err;
}
return 0;
}
#ifndef USE_I2C
int serial_transaction(void) {
int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
if (serial_update_buffers()) {
return 1;
}
for (int i = 0; i < ROWS_PER_HAND; ++i) {
matrix[slaveOffset+i] = serial_slave_buffer[i];
}
return 0;
}
#endif
uint8_t matrix_scan(void)
{
int ret = _matrix_scan();
#ifdef USE_I2C
if( i2c_transaction() ) {
#else
if( serial_transaction() ) {
#endif
// turn on the indicator led when halves are disconnected
TXLED1;
error_count++;
if (error_count > ERROR_DISCONNECT_COUNT) {
// reset other half if disconnected
int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
for (int i = 0; i < ROWS_PER_HAND; ++i) {
matrix[slaveOffset+i] = 0;
}
}
} else {
// turn off the indicator led on no error
TXLED0;
error_count = 0;
}
matrix_scan_quantum();
return ret;
}
void matrix_slave_scan(void) {
_matrix_scan();
int offset = (isLeftHand) ? 0 : (MATRIX_ROWS / 2);
#ifdef USE_I2C
for (int i = 0; i < ROWS_PER_HAND; ++i) {
/* i2c_slave_buffer[i] = matrix[offset+i]; */
i2c_slave_buffer[i] = matrix[offset+i];
}
#else
for (int i = 0; i < ROWS_PER_HAND; ++i) {
serial_slave_buffer[i] = matrix[offset+i];
}
#endif
}
bool matrix_is_modified(void)
{
if (debouncing) return false;
return true;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & ((matrix_row_t)1<<col));
}
inline
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
void matrix_print(void)
{
print("\nr/c 0123456789ABCDEF\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
phex(row); print(": ");
pbin_reverse16(matrix_get_row(row));
print("\n");
}
}
uint8_t matrix_key_count(void)
{
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
count += bitpop16(matrix[i]);
}
return count;
}
static void init_cols(void)
{
for(int x = 0; x < MATRIX_COLS; x++) {
_SFR_IO8((col_pins[x] >> 4) + 1) &= ~_BV(col_pins[x] & 0xF);
_SFR_IO8((col_pins[x] >> 4) + 2) |= _BV(col_pins[x] & 0xF);
}
}
static matrix_row_t read_cols(void)
{
matrix_row_t result = 0;
for(int x = 0; x < MATRIX_COLS; x++) {
result |= (_SFR_IO8(col_pins[x] >> 4) & _BV(col_pins[x] & 0xF)) ? 0 : (1 << x);
}
return result;
}
static void unselect_rows(void)
{
for(int x = 0; x < ROWS_PER_HAND; x++) {
_SFR_IO8((row_pins[x] >> 4) + 1) &= ~_BV(row_pins[x] & 0xF);
_SFR_IO8((row_pins[x] >> 4) + 2) |= _BV(row_pins[x] & 0xF);
}
}
static void select_row(uint8_t row)
{
_SFR_IO8((row_pins[row] >> 4) + 1) |= _BV(row_pins[row] & 0xF);
_SFR_IO8((row_pins[row] >> 4) + 2) &= ~_BV(row_pins[row] & 0xF);
}

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/*
pins_arduino.h - Pin definition functions for Arduino
Part of Arduino - http://www.arduino.cc/
Copyright (c) 2007 David A. Mellis
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
$Id: wiring.h 249 2007-02-03 16:52:51Z mellis $
*/
#ifndef Pins_Arduino_h
#define Pins_Arduino_h
#include <avr/pgmspace.h>
// Workaround for wrong definitions in "iom32u4.h".
// This should be fixed in the AVR toolchain.
#undef UHCON
#undef UHINT
#undef UHIEN
#undef UHADDR
#undef UHFNUM
#undef UHFNUML
#undef UHFNUMH
#undef UHFLEN
#undef UPINRQX
#undef UPINTX
#undef UPNUM
#undef UPRST
#undef UPCONX
#undef UPCFG0X
#undef UPCFG1X
#undef UPSTAX
#undef UPCFG2X
#undef UPIENX
#undef UPDATX
#undef TCCR2A
#undef WGM20
#undef WGM21
#undef COM2B0
#undef COM2B1
#undef COM2A0
#undef COM2A1
#undef TCCR2B
#undef CS20
#undef CS21
#undef CS22
#undef WGM22
#undef FOC2B
#undef FOC2A
#undef TCNT2
#undef TCNT2_0
#undef TCNT2_1
#undef TCNT2_2
#undef TCNT2_3
#undef TCNT2_4
#undef TCNT2_5
#undef TCNT2_6
#undef TCNT2_7
#undef OCR2A
#undef OCR2_0
#undef OCR2_1
#undef OCR2_2
#undef OCR2_3
#undef OCR2_4
#undef OCR2_5
#undef OCR2_6
#undef OCR2_7
#undef OCR2B
#undef OCR2_0
#undef OCR2_1
#undef OCR2_2
#undef OCR2_3
#undef OCR2_4
#undef OCR2_5
#undef OCR2_6
#undef OCR2_7
#define NUM_DIGITAL_PINS 30
#define NUM_ANALOG_INPUTS 12
#define TX_RX_LED_INIT DDRD |= (1<<5), DDRB |= (1<<0)
#define TXLED0 PORTD |= (1<<5)
#define TXLED1 PORTD &= ~(1<<5)
#define RXLED0 PORTB |= (1<<0)
#define RXLED1 PORTB &= ~(1<<0)
static const uint8_t SDA = 2;
static const uint8_t SCL = 3;
#define LED_BUILTIN 13
// Map SPI port to 'new' pins D14..D17
static const uint8_t SS = 17;
static const uint8_t MOSI = 16;
static const uint8_t MISO = 14;
static const uint8_t SCK = 15;
// Mapping of analog pins as digital I/O
// A6-A11 share with digital pins
static const uint8_t A0 = 18;
static const uint8_t A1 = 19;
static const uint8_t A2 = 20;
static const uint8_t A3 = 21;
static const uint8_t A4 = 22;
static const uint8_t A5 = 23;
static const uint8_t A6 = 24; // D4
static const uint8_t A7 = 25; // D6
static const uint8_t A8 = 26; // D8
static const uint8_t A9 = 27; // D9
static const uint8_t A10 = 28; // D10
static const uint8_t A11 = 29; // D12
#define digitalPinToPCICR(p) ((((p) >= 8 && (p) <= 11) || ((p) >= 14 && (p) <= 17) || ((p) >= A8 && (p) <= A10)) ? (&PCICR) : ((uint8_t *)0))
#define digitalPinToPCICRbit(p) 0
#define digitalPinToPCMSK(p) ((((p) >= 8 && (p) <= 11) || ((p) >= 14 && (p) <= 17) || ((p) >= A8 && (p) <= A10)) ? (&PCMSK0) : ((uint8_t *)0))
#define digitalPinToPCMSKbit(p) ( ((p) >= 8 && (p) <= 11) ? (p) - 4 : ((p) == 14 ? 3 : ((p) == 15 ? 1 : ((p) == 16 ? 2 : ((p) == 17 ? 0 : (p - A8 + 4))))))
// __AVR_ATmega32U4__ has an unusual mapping of pins to channels
extern const uint8_t PROGMEM analog_pin_to_channel_PGM[];
#define analogPinToChannel(P) ( pgm_read_byte( analog_pin_to_channel_PGM + (P) ) )
#define digitalPinToInterrupt(p) ((p) == 0 ? 2 : ((p) == 1 ? 3 : ((p) == 2 ? 1 : ((p) == 3 ? 0 : ((p) == 7 ? 4 : NOT_AN_INTERRUPT)))))
#ifdef ARDUINO_MAIN
// On the Arduino board, digital pins are also used
// for the analog output (software PWM). Analog input
// pins are a separate set.
// ATMEL ATMEGA32U4 / ARDUINO LEONARDO
//
// D0 PD2 RXD1/INT2
// D1 PD3 TXD1/INT3
// D2 PD1 SDA SDA/INT1
// D3# PD0 PWM8/SCL OC0B/SCL/INT0
// D4 A6 PD4 ADC8
// D5# PC6 ??? OC3A/#OC4A
// D6# A7 PD7 FastPWM #OC4D/ADC10
// D7 PE6 INT6/AIN0
//
// D8 A8 PB4 ADC11/PCINT4
// D9# A9 PB5 PWM16 OC1A/#OC4B/ADC12/PCINT5
// D10# A10 PB6 PWM16 OC1B/0c4B/ADC13/PCINT6
// D11# PB7 PWM8/16 0C0A/OC1C/#RTS/PCINT7
// D12 A11 PD6 T1/#OC4D/ADC9
// D13# PC7 PWM10 CLK0/OC4A
//
// A0 D18 PF7 ADC7
// A1 D19 PF6 ADC6
// A2 D20 PF5 ADC5
// A3 D21 PF4 ADC4
// A4 D22 PF1 ADC1
// A5 D23 PF0 ADC0
//
// New pins D14..D17 to map SPI port to digital pins
//
// MISO D14 PB3 MISO,PCINT3
// SCK D15 PB1 SCK,PCINT1
// MOSI D16 PB2 MOSI,PCINT2
// SS D17 PB0 RXLED,SS/PCINT0
//
// Connected LEDs on board for TX and RX
// TXLED D24 PD5 XCK1
// RXLED D17 PB0
// HWB PE2 HWB
// these arrays map port names (e.g. port B) to the
// appropriate addresses for various functions (e.g. reading
// and writing)
const uint16_t PROGMEM port_to_mode_PGM[] = {
NOT_A_PORT,
NOT_A_PORT,
(uint16_t) &DDRB,
(uint16_t) &DDRC,
(uint16_t) &DDRD,
(uint16_t) &DDRE,
(uint16_t) &DDRF,
};
const uint16_t PROGMEM port_to_output_PGM[] = {
NOT_A_PORT,
NOT_A_PORT,
(uint16_t) &PORTB,
(uint16_t) &PORTC,
(uint16_t) &PORTD,
(uint16_t) &PORTE,
(uint16_t) &PORTF,
};
const uint16_t PROGMEM port_to_input_PGM[] = {
NOT_A_PORT,
NOT_A_PORT,
(uint16_t) &PINB,
(uint16_t) &PINC,
(uint16_t) &PIND,
(uint16_t) &PINE,
(uint16_t) &PINF,
};
const uint8_t PROGMEM digital_pin_to_port_PGM[] = {
PD, // D0 - PD2
PD, // D1 - PD3
PD, // D2 - PD1
PD, // D3 - PD0
PD, // D4 - PD4
PC, // D5 - PC6
PD, // D6 - PD7
PE, // D7 - PE6
PB, // D8 - PB4
PB, // D9 - PB5
PB, // D10 - PB6
PB, // D11 - PB7
PD, // D12 - PD6
PC, // D13 - PC7
PB, // D14 - MISO - PB3
PB, // D15 - SCK - PB1
PB, // D16 - MOSI - PB2
PB, // D17 - SS - PB0
PF, // D18 - A0 - PF7
PF, // D19 - A1 - PF6
PF, // D20 - A2 - PF5
PF, // D21 - A3 - PF4
PF, // D22 - A4 - PF1
PF, // D23 - A5 - PF0
PD, // D24 - PD5
PD, // D25 / D6 - A7 - PD7
PB, // D26 / D8 - A8 - PB4
PB, // D27 / D9 - A9 - PB5
PB, // D28 / D10 - A10 - PB6
PD, // D29 / D12 - A11 - PD6
};
const uint8_t PROGMEM digital_pin_to_bit_mask_PGM[] = {
_BV(2), // D0 - PD2
_BV(3), // D1 - PD3
_BV(1), // D2 - PD1
_BV(0), // D3 - PD0
_BV(4), // D4 - PD4
_BV(6), // D5 - PC6
_BV(7), // D6 - PD7
_BV(6), // D7 - PE6
_BV(4), // D8 - PB4
_BV(5), // D9 - PB5
_BV(6), // D10 - PB6
_BV(7), // D11 - PB7
_BV(6), // D12 - PD6
_BV(7), // D13 - PC7
_BV(3), // D14 - MISO - PB3
_BV(1), // D15 - SCK - PB1
_BV(2), // D16 - MOSI - PB2
_BV(0), // D17 - SS - PB0
_BV(7), // D18 - A0 - PF7
_BV(6), // D19 - A1 - PF6
_BV(5), // D20 - A2 - PF5
_BV(4), // D21 - A3 - PF4
_BV(1), // D22 - A4 - PF1
_BV(0), // D23 - A5 - PF0
_BV(5), // D24 - PD5
_BV(7), // D25 / D6 - A7 - PD7
_BV(4), // D26 / D8 - A8 - PB4
_BV(5), // D27 / D9 - A9 - PB5
_BV(6), // D28 / D10 - A10 - PB6
_BV(6), // D29 / D12 - A11 - PD6
};
const uint8_t PROGMEM digital_pin_to_timer_PGM[] = {
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
TIMER0B, /* 3 */
NOT_ON_TIMER,
TIMER3A, /* 5 */
TIMER4D, /* 6 */
NOT_ON_TIMER,
NOT_ON_TIMER,
TIMER1A, /* 9 */
TIMER1B, /* 10 */
TIMER0A, /* 11 */
NOT_ON_TIMER,
TIMER4A, /* 13 */
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
NOT_ON_TIMER,
};
const uint8_t PROGMEM analog_pin_to_channel_PGM[] = {
7, // A0 PF7 ADC7
6, // A1 PF6 ADC6
5, // A2 PF5 ADC5
4, // A3 PF4 ADC4
1, // A4 PF1 ADC1
0, // A5 PF0 ADC0
8, // A6 D4 PD4 ADC8
10, // A7 D6 PD7 ADC10
11, // A8 D8 PB4 ADC11
12, // A9 D9 PB5 ADC12
13, // A10 D10 PB6 ADC13
9 // A11 D12 PD6 ADC9
};
#endif /* ARDUINO_MAIN */
// These serial port names are intended to allow libraries and architecture-neutral
// sketches to automatically default to the correct port name for a particular type
// of use. For example, a GPS module would normally connect to SERIAL_PORT_HARDWARE_OPEN,
// the first hardware serial port whose RX/TX pins are not dedicated to another use.
//
// SERIAL_PORT_MONITOR Port which normally prints to the Arduino Serial Monitor
//
// SERIAL_PORT_USBVIRTUAL Port which is USB virtual serial
//
// SERIAL_PORT_LINUXBRIDGE Port which connects to a Linux system via Bridge library
//
// SERIAL_PORT_HARDWARE Hardware serial port, physical RX & TX pins.
//
// SERIAL_PORT_HARDWARE_OPEN Hardware serial ports which are open for use. Their RX & TX
// pins are NOT connected to anything by default.
#define SERIAL_PORT_MONITOR Serial
#define SERIAL_PORT_USBVIRTUAL Serial
#define SERIAL_PORT_HARDWARE Serial1
#define SERIAL_PORT_HARDWARE_OPEN Serial1
#endif /* Pins_Arduino_h */

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Let's Split
======
This readme and most of the code are from https://github.com/ahtn/tmk_keyboard/
Split keyboard firmware for Arduino Pro Micro or other ATmega32u4
based boards.
Features
--------
Some features supported by the firmware:
* Either half can connect to the computer via USB, or both halves can be used
independently.
* You only need 3 wires to connect the two halves. Two for VCC and GND and one
for serial communication.
* Optional support for I2C connection between the two halves if for some
reason you require a faster connection between the two halves. Note this
requires an extra wire between halves and pull-up resistors on the data lines.
Required Hardware
-----------------
Apart from diodes and key switches for the keyboard matrix in each half, you
will need:
* 2 Arduino Pro Micro's. You can find theses on aliexpress for ≈3.50USD each.
* 2 TRS sockets
* 1 TRS cable.
Alternatively, you can use any sort of cable and socket that has at least 3
wires. If you want to use I2C to communicate between halves, you will need a
cable with at least 4 wires and 2x 4.7kΩ pull-up resistors
Optional Hardware
-----------------
A speaker can be hooked-up to either side to the `5` (`C6`) pin and `GND`, and turned on via `AUDIO_ENABLE`.
Wiring
------
The 3 wires of the TRS cable need to connect GND, VCC, and digital pin 3 (i.e.
PD0 on the ATmega32u4) between the two Pro Micros.
Then wire your key matrix to any of the remaining 17 IO pins of the pro micro
and modify the `matrix.c` accordingly.
The wiring for serial:
![serial wiring](imgs/split-keyboard-serial-schematic.png)
The wiring for i2c:
![i2c wiring](imgs/split-keyboard-i2c-schematic.png)
The pull-up resistors may be placed on either half. It is also possible
to use 4 resistors and have the pull-ups in both halves, but this is
unnecessary in simple use cases.
Notes on Software Configuration
-------------------------------
Configuring the firmware is similar to any other TMK project. One thing
to note is that `MATIX_ROWS` in `config.h` is the total number of rows between
the two halves, i.e. if your split keyboard has 4 rows in each half, then
`MATRIX_ROWS=8`.
Also the current implementation assumes a maximum of 8 columns, but it would
not be very difficult to adapt it to support more if required.
Flashing
--------
If you define `EE_HANDS` in your `config.h`, you will need to set the
EEPROM for the left and right halves. The EEPROM is used to store whether the
half is left handed or right handed. This makes it so that the same firmware
file will run on both hands instead of having to flash left and right handed
versions of the firmware to each half. To flash the EEPROM file for the left
half run:
```
make eeprom-left
```
and similarly for right half
```
make eeprom-right
```
After you have flashed the EEPROM for the first time, you then need to program
the flash memory:
```
make program
```
Note that you need to program both halves, but you have the option of using
different keymaps for each half. You could program the left half with a QWERTY
layout and the right half with a Colemak layout. Then if you connect the left
half to a computer by USB the keyboard will use QWERTY and Colemak when the
right half is connected.

225
keyboards/lets_split/serial.c
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@ -0,0 +1,225 @@
/*
* WARNING: be careful changing this code, it is very timing dependent
*/
#ifndef F_CPU
#define F_CPU 16000000
#endif
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdbool.h>
#include "serial.h"
// Serial pulse period in microseconds. Its probably a bad idea to lower this
// value.
#define SERIAL_DELAY 24
uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
#define SLAVE_DATA_CORRUPT (1<<0)
volatile uint8_t status = 0;
inline static
void serial_delay(void) {
_delay_us(SERIAL_DELAY);
}
inline static
void serial_output(void) {
SERIAL_PIN_DDR |= SERIAL_PIN_MASK;
}
// make the serial pin an input with pull-up resistor
inline static
void serial_input(void) {
SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK;
SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
}
inline static
uint8_t serial_read_pin(void) {
return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK);
}
inline static
void serial_low(void) {
SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK;
}
inline static
void serial_high(void) {
SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
}
void serial_master_init(void) {
serial_output();
serial_high();
}
void serial_slave_init(void) {
serial_input();
// Enable INT0
EIMSK |= _BV(INT0);
// Trigger on falling edge of INT0
EICRA &= ~(_BV(ISC00) | _BV(ISC01));
}
// Used by the master to synchronize timing with the slave.
static
void sync_recv(void) {
serial_input();
// This shouldn't hang if the slave disconnects because the
// serial line will float to high if the slave does disconnect.
while (!serial_read_pin());
serial_delay();
}
// Used by the slave to send a synchronization signal to the master.
static
void sync_send(void) {
serial_output();
serial_low();
serial_delay();
serial_high();
}
// Reads a byte from the serial line
static
uint8_t serial_read_byte(void) {
uint8_t byte = 0;
serial_input();
for ( uint8_t i = 0; i < 8; ++i) {
byte = (byte << 1) | serial_read_pin();
serial_delay();
_delay_us(1);
}
return byte;
}
// Sends a byte with MSB ordering
static
void serial_write_byte(uint8_t data) {
uint8_t b = 8;
serial_output();
while( b-- ) {
if(data & (1 << b)) {
serial_high();
} else {
serial_low();
}
serial_delay();
}
}
// interrupt handle to be used by the slave device
ISR(SERIAL_PIN_INTERRUPT) {
sync_send();
uint8_t checksum = 0;
for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
serial_write_byte(serial_slave_buffer[i]);
sync_send();
checksum += serial_slave_buffer[i];
}
serial_write_byte(checksum);
sync_send();
// wait for the sync to finish sending
serial_delay();
// read the middle of pulses
_delay_us(SERIAL_DELAY/2);
uint8_t checksum_computed = 0;
for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
serial_master_buffer[i] = serial_read_byte();
sync_send();
checksum_computed += serial_master_buffer[i];
}
uint8_t checksum_received = serial_read_byte();
sync_send();
serial_input(); // end transaction
if ( checksum_computed != checksum_received ) {
status |= SLAVE_DATA_CORRUPT;
} else {
status &= ~SLAVE_DATA_CORRUPT;
}
}
inline
bool serial_slave_DATA_CORRUPT(void) {
return status & SLAVE_DATA_CORRUPT;
}
// Copies the serial_slave_buffer to the master and sends the
// serial_master_buffer to the slave.
//
// Returns:
// 0 => no error
// 1 => slave did not respond
int serial_update_buffers(void) {
// this code is very time dependent, so we need to disable interrupts
cli();
// signal to the slave that we want to start a transaction
serial_output();
serial_low();
_delay_us(1);
// wait for the slaves response
serial_input();
serial_high();
_delay_us(SERIAL_DELAY);
// check if the slave is present
if (serial_read_pin()) {
// slave failed to pull the line low, assume not present
sei();
return 1;
}
// if the slave is present syncronize with it
sync_recv();
uint8_t checksum_computed = 0;
// receive data from the slave
for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
serial_slave_buffer[i] = serial_read_byte();
sync_recv();
checksum_computed += serial_slave_buffer[i];
}
uint8_t checksum_received = serial_read_byte();
sync_recv();
if (checksum_computed != checksum_received) {
sei();
return 1;
}
uint8_t checksum = 0;
// send data to the slave
for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
serial_write_byte(serial_master_buffer[i]);
sync_recv();
checksum += serial_master_buffer[i];
}
serial_write_byte(checksum);
sync_recv();
// always, release the line when not in use
serial_output();
serial_high();
sei();
return 0;
}

26
keyboards/lets_split/serial.h
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@ -0,0 +1,26 @@
#ifndef MY_SERIAL_H
#define MY_SERIAL_H
#include "config.h"
#include <stdbool.h>
/* TODO: some defines for interrupt setup */
#define SERIAL_PIN_DDR DDRD
#define SERIAL_PIN_PORT PORTD
#define SERIAL_PIN_INPUT PIND
#define SERIAL_PIN_MASK _BV(PD0)
#define SERIAL_PIN_INTERRUPT INT0_vect
#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
#define SERIAL_MASTER_BUFFER_LENGTH 1
// Buffers for master - slave communication
extern volatile uint8_t serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH];
extern volatile uint8_t serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH];
void serial_master_init(void);
void serial_slave_init(void);
int serial_update_buffers(void);
bool serial_slave_data_corrupt(void);
#endif

76
keyboards/lets_split/split_util.c
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@ -0,0 +1,76 @@
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/power.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/eeprom.h>
#include "split_util.h"
#include "matrix.h"
#include "i2c.h"
#include "serial.h"
#include "keyboard.h"
#include "config.h"
volatile bool isLeftHand = true;
static void setup_handedness(void) {
#ifdef EE_HANDS
isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
#else
#ifdef I2C_MASTER_RIGHT
isLeftHand = !has_usb();
#else
isLeftHand = has_usb();
#endif
#endif
}
static void keyboard_master_setup(void) {
#ifdef USE_I2C
i2c_master_init();
#else
serial_master_init();
#endif
}
static void keyboard_slave_setup(void) {
#ifdef USE_I2C
i2c_slave_init(SLAVE_I2C_ADDRESS);
#else
serial_slave_init();
#endif
}
bool has_usb(void) {
USBCON |= (1 << OTGPADE); //enables VBUS pad
_delay_us(5);
return (USBSTA & (1<<VBUS)); //checks state of VBUS
}
void split_keyboard_setup(void) {
setup_handedness();
if (has_usb()) {
keyboard_master_setup();
} else {
keyboard_slave_setup();
}
sei();
}
void keyboard_slave_loop(void) {
matrix_init();
while (1) {
matrix_slave_scan();
}
}
// this code runs before the usb and keyboard is initialized
void matrix_setup(void) {
split_keyboard_setup();
if (!has_usb()) {
keyboard_slave_loop();
}
}

22
keyboards/lets_split/split_util.h
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@ -0,0 +1,22 @@
#ifndef SPLIT_KEYBOARD_UTIL_H
#define SPLIT_KEYBOARD_UTIL_H
#include <stdbool.h>
#ifdef EE_HANDS
#define EECONFIG_BOOTMAGIC_END (uint8_t *)10
#define EECONFIG_HANDEDNESS EECONFIG_BOOTMAGIC_END
#endif
#define SLAVE_I2C_ADDRESS 0x32
extern volatile bool isLeftHand;
// slave version of matix scan, defined in matrix.c
void matrix_slave_scan(void);
void split_keyboard_setup(void);
bool has_usb(void);
void keyboard_slave_loop(void);
#endif

2
quantum/quantum.c
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@ -89,7 +89,7 @@ bool process_record_quantum(keyrecord_t *record) {
shutdown_user(); shutdown_user();
#endif #endif
wait_ms(250); wait_ms(250);
#ifdef ATREUS_ASTAR #ifdef CATERINA_BOOTLOADER
*(uint16_t *)0x0800 = 0x7777; // these two are a-star-specific *(uint16_t *)0x0800 = 0x7777; // these two are a-star-specific
#endif #endif
bootloader_jump(); bootloader_jump();

54
tmk_core/common/avr/bootloader.c
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@ -73,26 +73,46 @@ uint32_t reset_key __attribute__ ((section (".noinit")));
/* initialize MCU status by watchdog reset */ /* initialize MCU status by watchdog reset */
void bootloader_jump(void) { void bootloader_jump(void) {
#ifdef PROTOCOL_LUFA #ifndef CATERINA_BOOTLOADER
USB_Disable();
cli();
_delay_ms(2000);
#endif
#ifdef PROTOCOL_PJRC #ifdef PROTOCOL_LUFA
cli(); USB_Disable();
UDCON = 1; cli();
USBCON = (1<<FRZCLK); _delay_ms(2000);
UCSR1B = 0; #endif
_delay_ms(5);
#endif
// watchdog reset #ifdef PROTOCOL_PJRC
reset_key = BOOTLOADER_RESET_KEY; cli();
wdt_enable(WDTO_250MS); UDCON = 1;
for (;;); USBCON = (1<<FRZCLK);
} UCSR1B = 0;
_delay_ms(5);
#endif
// watchdog reset
reset_key = BOOTLOADER_RESET_KEY;
wdt_enable(WDTO_250MS);
for (;;);
#else
// this block may be optional
// TODO: figure it out
uint16_t *const bootKeyPtr = (uint16_t *)0x0800;
// Value used by Caterina bootloader use to determine whether to run the
// sketch or the bootloader programmer.
uint16_t bootKey = 0x7777;
*bootKeyPtr = bootKey;
// setup watchdog timeout
wdt_enable(WDTO_60MS);
while(1) {} // wait for watchdog timer to trigger
#endif
}
/* this runs before main() */ /* this runs before main() */
void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3"))); void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));

5
tmk_core/common/matrix.h
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@ -72,6 +72,11 @@ void matrix_scan_kb(void);
void matrix_init_user(void); void matrix_init_user(void);
void matrix_scan_user(void); void matrix_scan_user(void);
#ifdef I2C_SPLIT
void slave_matrix_init(void);
uint8_t slave_matrix_scan(void);
#endif
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

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