From 191fec009f4f297793f63d75522af777bbe3d515 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pawe=C5=82=20Stawicki?= Date: Sun, 8 Jan 2017 17:01:07 +0100 Subject: [PATCH] Add digipot i2c control for MCP4018 --- Marlin/digipot_mcp4018.cpp | 91 ++++++++++++++++++++++++++++++++++++++ Marlin/digipot_mcp4451.cpp | 2 +- 2 files changed, 92 insertions(+), 1 deletion(-) create mode 100644 Marlin/digipot_mcp4018.cpp diff --git a/Marlin/digipot_mcp4018.cpp b/Marlin/digipot_mcp4018.cpp new file mode 100644 index 000000000..21c1e02e1 --- /dev/null +++ b/Marlin/digipot_mcp4018.cpp @@ -0,0 +1,91 @@ +/** + * Marlin 3D Printer Firmware + * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin] + * + * Based on Sprinter and grbl. + * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm + * + * 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 3 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 . + * + */ + +#include "MarlinConfig.h" + +#if ENABLED(DIGIPOT_I2C) && ENABLED(DIGIPOT_MCP4018) + +#include "Stream.h" +#include "utility/twi.h" +#include //https://github.com/felias-fogg/SlowSoftI2CMaster + +// Settings for the I2C based DIGIPOT (MCP4018) based on WT150 + +#define DIGIPOT_I2C_ADDRESS 0x2f + +#define DIGIPOT_A4988_Rsx 0.250 +#define DIGIPOT_A4988_Vrefmax 5.0 +#define DIGIPOT_A4988_MAX_VALUE 127 + +#define DIGIPOT_A4988_Itripmax(Vref) ((Vref)/(8.0*DIGIPOT_A4988_Rsx)) + +#define DIGIPOT_A4988_FACTOR (DIGIPOT_A4988_MAX_VALUE/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax)) +//TODO: MAX_CURRENT -0.5A ?? (currently set to 2A, max possible current 2.5A) +#define DIGIPOT_A4988_MAX_CURRENT (DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax) - 0.5) + +static byte current_to_wiper(float current) { + return byte(ceil(float((DIGIPOT_A4988_FACTOR * current)))); +} + +static uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = { + DIGIPOTS_I2C_SDA_X, + DIGIPOTS_I2C_SDA_Y, + DIGIPOTS_I2C_SDA_Z, + DIGIPOTS_I2C_SDA_E0, + DIGIPOTS_I2C_SDA_E1, +}; + +static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = { + SlowSoftI2CMaster { sda_pins[0], DIGIPOTS_I2C_SCL }, + SlowSoftI2CMaster { sda_pins[1], DIGIPOTS_I2C_SCL }, + SlowSoftI2CMaster { sda_pins[2], DIGIPOTS_I2C_SCL }, + SlowSoftI2CMaster { sda_pins[3], DIGIPOTS_I2C_SCL }, + SlowSoftI2CMaster { sda_pins[4], DIGIPOTS_I2C_SCL } +}; + +static void i2c_send(int channel, byte v) { + if (WITHIN(channel, 0, DIGIPOT_I2C_NUM_CHANNELS - 1)) { + pots[channel].i2c_start(((DIGIPOT_I2C_ADDRESS) << 1) | I2C_WRITE); + pots[channel].i2c_write(v); + pots[channel].i2c_stop(); + } +} + +// This is for the MCP4018 I2C based digipot +void digipot_i2c_set_current(int channel, float current) { + current = min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT)); + + i2c_send(channel, current_to_wiper(current)); +} + +void digipot_i2c_init() { + const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS; + + for (uint8_t i = 0; i < DIGIPOT_I2C_NUM_CHANNELS; i++) + pots[i].i2c_init(); + + // setup initial currents as defined in Configuration_adv.h + for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++) + digipot_i2c_set_current(i, digipot_motor_current[i]); +} + +#endif // DIGIPOT_I2C && DIGIPOT_MCP4018 diff --git a/Marlin/digipot_mcp4451.cpp b/Marlin/digipot_mcp4451.cpp index c6a01915f..9c91ac2ae 100644 --- a/Marlin/digipot_mcp4451.cpp +++ b/Marlin/digipot_mcp4451.cpp @@ -22,7 +22,7 @@ #include "MarlinConfig.h" -#if ENABLED(DIGIPOT_I2C) +#if ENABLED(DIGIPOT_I2C) && DISABLED(DIGIPOT_MCP4018) #include "Stream.h" #include "utility/twi.h"