You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
207 lines
5.8 KiB
207 lines
5.8 KiB
/*
|
|
|
|
u8g_com_arduino_uc_i2c.c
|
|
|
|
com interface for arduino (AND atmega) and the SSDxxxx chip (SOLOMON) variant
|
|
I2C protocol
|
|
|
|
ToDo: Rename this to u8g_com_avr_ssd_i2c.c
|
|
|
|
Universal 8bit Graphics Library
|
|
|
|
Copyright (c) 2012, olikraus@gmail.com
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without modification,
|
|
are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice, this list
|
|
of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright notice, this
|
|
list of conditions and the following disclaimer in the documentation and/or other
|
|
materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
|
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
Special pin usage:
|
|
U8G_PI_I2C_OPTION additional options
|
|
U8G_PI_A0_STATE used to store the last value of the command/data register selection
|
|
U8G_PI_SET_A0 1: Signal request to update I2C device with new A0_STATE, 0: Do nothing, A0_STATE matches I2C device
|
|
U8G_PI_SCL clock line (NOT USED)
|
|
U8G_PI_SDA data line (NOT USED)
|
|
|
|
U8G_PI_RESET reset line (currently disabled, see below)
|
|
|
|
Protocol:
|
|
SLA, Cmd/Data Selection, Arguments
|
|
The command/data register is selected by a special instruction byte, which is sent after SLA
|
|
|
|
The continue bit is always 0 so that a (re)start is equired for the change from cmd to/data mode
|
|
*/
|
|
|
|
#include "u8g.h"
|
|
|
|
#if defined(U8G_WITH_PINLIST)
|
|
|
|
#define DOGM240_SLA_CMD (0x38*2)
|
|
#define DOGM240_SLA_DATA (0x39*2)
|
|
|
|
uint8_t u8g_com_arduino_uc_start_sequence(u8g_t *u8g)
|
|
{
|
|
/* are we requested to set the a0 state? */
|
|
if ( u8g->pin_list[U8G_PI_SET_A0] == 0 )
|
|
return 1;
|
|
|
|
if ( u8g->pin_list[U8G_PI_A0_STATE] == 0 )
|
|
{
|
|
if ( u8g_i2c_start(DOGM240_SLA_CMD) == 0 )
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
if ( u8g_i2c_start(DOGM240_SLA_DATA) == 0 )
|
|
return 0;
|
|
}
|
|
|
|
u8g->pin_list[U8G_PI_SET_A0] = 0;
|
|
return 1;
|
|
}
|
|
|
|
uint8_t u8g_com_arduino_uc_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
|
|
{
|
|
switch(msg)
|
|
{
|
|
case U8G_COM_MSG_INIT:
|
|
//u8g_com_arduino_digital_write(u8g, U8G_PI_SCL, HIGH);
|
|
//u8g_com_arduino_digital_write(u8g, U8G_PI_SDA, HIGH);
|
|
//u8g->pin_list[U8G_PI_A0_STATE] = 0; /* inital RS state: unknown mode */
|
|
|
|
u8g_i2c_init(u8g->pin_list[U8G_PI_I2C_OPTION]);
|
|
|
|
break;
|
|
|
|
case U8G_COM_MSG_STOP:
|
|
break;
|
|
|
|
case U8G_COM_MSG_RESET:
|
|
/* Currently disabled, but it could be enable. Previous restrictions have been removed */
|
|
/* u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val); */
|
|
break;
|
|
|
|
case U8G_COM_MSG_CHIP_SELECT:
|
|
u8g->pin_list[U8G_PI_A0_STATE] = 0;
|
|
u8g->pin_list[U8G_PI_SET_A0] = 1; /* force a0 to set again, also forces start condition */
|
|
if ( arg_val == 0 )
|
|
{
|
|
/* disable chip, send stop condition */
|
|
u8g_i2c_stop();
|
|
}
|
|
else
|
|
{
|
|
/* enable, do nothing: any byte writing will trigger the i2c start */
|
|
}
|
|
break;
|
|
|
|
case U8G_COM_MSG_WRITE_BYTE:
|
|
//u8g->pin_list[U8G_PI_SET_A0] = 1;
|
|
if ( u8g_com_arduino_uc_start_sequence(u8g) == 0 )
|
|
return u8g_i2c_stop(), 0;
|
|
if ( u8g_i2c_send_byte(arg_val) == 0 )
|
|
return u8g_i2c_stop(), 0;
|
|
// u8g_i2c_stop();
|
|
break;
|
|
|
|
case U8G_COM_MSG_WRITE_SEQ:
|
|
//u8g->pin_list[U8G_PI_SET_A0] = 1;
|
|
if ( u8g_com_arduino_uc_start_sequence(u8g) == 0 )
|
|
return u8g_i2c_stop(), 0;
|
|
{
|
|
register uint8_t *ptr = arg_ptr;
|
|
while( arg_val > 0 )
|
|
{
|
|
if ( u8g_i2c_send_byte(*ptr++) == 0 )
|
|
return u8g_i2c_stop(), 0;
|
|
arg_val--;
|
|
}
|
|
}
|
|
// u8g_i2c_stop();
|
|
break;
|
|
|
|
case U8G_COM_MSG_WRITE_SEQ_P:
|
|
//u8g->pin_list[U8G_PI_SET_A0] = 1;
|
|
if ( u8g_com_arduino_uc_start_sequence(u8g) == 0 )
|
|
return u8g_i2c_stop(), 0;
|
|
{
|
|
register uint8_t *ptr = arg_ptr;
|
|
while( arg_val > 0 )
|
|
{
|
|
if ( u8g_i2c_send_byte(u8g_pgm_read(ptr)) == 0 )
|
|
return 0;
|
|
ptr++;
|
|
arg_val--;
|
|
}
|
|
}
|
|
// u8g_i2c_stop();
|
|
break;
|
|
|
|
case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
|
|
u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
|
|
u8g->pin_list[U8G_PI_SET_A0] = 1; /* force a0 to set again */
|
|
|
|
#ifdef OLD_CODE
|
|
if ( i2c_state != 0 )
|
|
{
|
|
u8g_i2c_stop();
|
|
i2c_state = 0;
|
|
}
|
|
|
|
if ( u8g_com_arduino_uc_start_sequence(arg_val) == 0 )
|
|
return 0;
|
|
|
|
/* setup bus, might be a repeated start */
|
|
/*
|
|
if ( u8g_i2c_start(I2C_SLA) == 0 )
|
|
return 0;
|
|
if ( arg_val == 0 )
|
|
{
|
|
i2c_state = 1;
|
|
|
|
if ( u8g_i2c_send_byte(I2C_CMD_MODE) == 0 )
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
i2c_state = 2;
|
|
if ( u8g_i2c_send_byte(I2C_DATA_MODE) == 0 )
|
|
return 0;
|
|
}
|
|
*/
|
|
#endif
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#else /* defined(U8G_WITH_PINLIST) */
|
|
|
|
uint8_t u8g_com_arduino_uc_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
#endif /* defined(U8G_WITH_PINLIST) */
|
|
|