155be34a1d
I2C timing parameters were seemingly set up for an STM32F303 target MCU, at a specific clock speed. This commit allows specifying the timing parameters via config.h, allowing other STM32 MCUs to be targeted, potentially at different clock frequencies. Alternate function modes for the I2C pins are now also configurable, allowing for remapping to other pins.
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* Copyright 2018 Jack Humbert
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* Copyright 2018 Yiancar
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*
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* This program is free sofare: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Sofare Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* This library follows the convention of the AVR i2c_master library.
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* As a result addresses are expected to be already shifted (addr << 1).
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* I2CD1 is the default driver which corresponds to pins B6 and B7. This
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* can be changed.
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* Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
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* STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file.
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*/
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#include "ch.h"
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#include <hal.h>
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#ifdef I2C1_BANK
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#define I2C1_SCL_BANK I2C1_BANK
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#define I2C1_SDA_BANK I2C1_BANK
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#endif
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#ifndef I2C1_SCL_BANK
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#define I2C1_SCL_BANK GPIOB
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#endif
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#ifndef I2C1_SDA_BANK
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#define I2C1_SDA_BANK GPIOB
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#endif
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#ifndef I2C1_SCL
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#define I2C1_SCL 6
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#endif
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#ifndef I2C1_SDA
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#define I2C1_SDA 7
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#endif
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// The default PAL alternate modes are used to signal that the pins are used for I2C
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#ifndef I2C1_SCL_PAL_MODE
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#define I2C1_SCL_PAL_MODE 4
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#endif
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#ifndef I2C1_SDA_PAL_MODE
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#define I2C1_SDA_PAL_MODE 4
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#endif
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// The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock
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// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
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#ifndef I2C1_TIMINGR_PRESC
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#define I2C1_TIMINGR_PRESC 15U
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#endif
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#ifndef I2C1_TIMINGR_SCLDEL
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#define I2C1_TIMINGR_SCLDEL 4U
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#endif
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#ifndef I2C1_TIMINGR_SDADEL
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#define I2C1_TIMINGR_SDADEL 2U
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#endif
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#ifndef I2C1_TIMINGR_SCLH
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#define I2C1_TIMINGR_SCLH 15U
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#endif
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#ifndef I2C1_TIMINGR_SCLL
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#define I2C1_TIMINGR_SCLL 21U
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#endif
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#ifndef I2C_DRIVER
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#define I2C_DRIVER I2CD1
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#endif
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typedef int16_t i2c_status_t;
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#define I2C_STATUS_SUCCESS (0)
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#define I2C_STATUS_ERROR (-1)
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#define I2C_STATUS_TIMEOUT (-2)
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void i2c_init(void);
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i2c_status_t i2c_start(uint8_t address);
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i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_transmit_receive(uint8_t address, uint8_t * tx_body, uint16_t tx_length, uint8_t * rx_body, uint16_t rx_length);
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i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
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i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t* regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
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void i2c_stop(void);
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