/* Copyright 2018 Jack Humbert * Copyright 2018 Yiancar * * 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/>. */ /* This library follows the convention of the AVR i2c_master library. * As a result addresses are expected to be already shifted (addr << 1). * I2CD1 is the default driver which corresponds to pins B6 and B7. This * can be changed. * Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. */ #pragma once #include <ch.h> #include <hal.h> #ifdef I2C1_BANK # define I2C1_SCL_BANK I2C1_BANK # define I2C1_SDA_BANK I2C1_BANK #endif #ifndef I2C1_SCL_BANK # define I2C1_SCL_BANK GPIOB #endif #ifndef I2C1_SDA_BANK # define I2C1_SDA_BANK GPIOB #endif #ifndef I2C1_SCL # define I2C1_SCL 6 #endif #ifndef I2C1_SDA # define I2C1_SDA 7 #endif #ifdef USE_I2CV1 # ifndef I2C1_OPMODE # define I2C1_OPMODE OPMODE_I2C # endif # ifndef I2C1_CLOCK_SPEED # define I2C1_CLOCK_SPEED 100000 /* 400000 */ # endif # ifndef I2C1_DUTY_CYCLE # define I2C1_DUTY_CYCLE STD_DUTY_CYCLE /* FAST_DUTY_CYCLE_2 */ # endif #else // The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock // For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html # ifndef I2C1_TIMINGR_PRESC # define I2C1_TIMINGR_PRESC 0U # endif # ifndef I2C1_TIMINGR_SCLDEL # define I2C1_TIMINGR_SCLDEL 7U # endif # ifndef I2C1_TIMINGR_SDADEL # define I2C1_TIMINGR_SDADEL 0U # endif # ifndef I2C1_TIMINGR_SCLH # define I2C1_TIMINGR_SCLH 38U # endif # ifndef I2C1_TIMINGR_SCLL # define I2C1_TIMINGR_SCLL 129U # endif #endif #ifndef I2C_DRIVER # define I2C_DRIVER I2CD1 #endif #ifdef USE_GPIOV1 # ifndef I2C1_SCL_PAL_MODE # define I2C1_SCL_PAL_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN # endif # ifndef I2C1_SDA_PAL_MODE # define I2C1_SDA_PAL_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN # endif #else // The default PAL alternate modes are used to signal that the pins are used for I2C # ifndef I2C1_SCL_PAL_MODE # define I2C1_SCL_PAL_MODE 4 # endif # ifndef I2C1_SDA_PAL_MODE # define I2C1_SDA_PAL_MODE 4 # endif #endif typedef int16_t i2c_status_t; #define I2C_STATUS_SUCCESS (0) #define I2C_STATUS_ERROR (-1) #define I2C_STATUS_TIMEOUT (-2) void i2c_init(void); i2c_status_t i2c_start(uint8_t address); i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout); i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout); i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout); i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout); void i2c_stop(void);