990 lines
23 KiB
C
990 lines
23 KiB
C
/*
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* Copyright (c) 2017, I-SENSE group of ICCS
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* Copyright (c) 2017 Linaro Ltd
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* I2C Driver for: STM32F1, STM32F2, STM32F4 and STM32L1
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*
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*/
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#include <drivers/clock_control/stm32_clock_control.h>
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#include <drivers/clock_control.h>
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#include <sys/util.h>
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#include <kernel.h>
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#include <soc.h>
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#include <stm32_ll_i2c.h>
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#include <errno.h>
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#include <drivers/i2c.h>
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#include "i2c_ll_stm32.h"
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#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_REGISTER(i2c_ll_stm32_v1);
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#include "i2c-priv.h"
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#define STM32_I2C_TRANSFER_TIMEOUT_MSEC 500
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#define STM32_I2C_TIMEOUT_USEC 1000
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#define I2C_REQUEST_WRITE 0x00
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#define I2C_REQUEST_READ 0x01
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#define HEADER 0xF0
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static void stm32_i2c_generate_start_condition(I2C_TypeDef *i2c)
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{
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uint16_t cr1 = LL_I2C_ReadReg(i2c, CR1);
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if (cr1 & I2C_CR1_STOP) {
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LOG_DBG("%s: START while STOP active!", __func__);
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LL_I2C_WriteReg(i2c, CR1, cr1 & ~I2C_CR1_STOP);
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}
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LL_I2C_GenerateStartCondition(i2c);
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}
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#ifdef CONFIG_I2C_STM32_INTERRUPT
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static void stm32_i2c_disable_transfer_interrupts(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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LL_I2C_DisableIT_TX(i2c);
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LL_I2C_DisableIT_RX(i2c);
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LL_I2C_DisableIT_EVT(i2c);
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LL_I2C_DisableIT_BUF(i2c);
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LL_I2C_DisableIT_ERR(i2c);
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}
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static void stm32_i2c_enable_transfer_interrupts(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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LL_I2C_EnableIT_ERR(i2c);
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LL_I2C_EnableIT_EVT(i2c);
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LL_I2C_EnableIT_BUF(i2c);
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}
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#endif /* CONFIG_I2C_STM32_INTERRUPT */
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static void stm32_i2c_reset(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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uint16_t cr1, cr2, oar1, oar2, trise, ccr;
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#if defined(I2C_FLTR_ANOFF) && defined(I2C_FLTR_DNF)
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uint16_t fltr;
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#endif
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/* disable i2c and disable IRQ's */
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LL_I2C_Disable(i2c);
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#ifdef CONFIG_I2C_STM32_INTERRUPT
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stm32_i2c_disable_transfer_interrupts(dev);
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#endif
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/* save all important registers before reset */
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cr1 = LL_I2C_ReadReg(i2c, CR1);
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cr2 = LL_I2C_ReadReg(i2c, CR2);
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oar1 = LL_I2C_ReadReg(i2c, OAR1);
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oar2 = LL_I2C_ReadReg(i2c, OAR2);
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ccr = LL_I2C_ReadReg(i2c, CCR);
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trise = LL_I2C_ReadReg(i2c, TRISE);
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#if defined(I2C_FLTR_ANOFF) && defined(I2C_FLTR_DNF)
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fltr = LL_I2C_ReadReg(i2c, FLTR);
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#endif
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/* reset i2c hardware */
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LL_I2C_EnableReset(i2c);
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LL_I2C_DisableReset(i2c);
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/* restore all important registers after reset */
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LL_I2C_WriteReg(i2c, CR1, cr1);
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LL_I2C_WriteReg(i2c, CR2, cr2);
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/* bit 14 of OAR1 must always be 1 */
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oar1 |= (1 << 14);
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LL_I2C_WriteReg(i2c, OAR1, oar1);
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LL_I2C_WriteReg(i2c, OAR2, oar2);
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LL_I2C_WriteReg(i2c, CCR, ccr);
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LL_I2C_WriteReg(i2c, TRISE, trise);
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#if defined(I2C_FLTR_ANOFF) && defined(I2C_FLTR_DNF)
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LL_I2C_WriteReg(i2c, FLTR, fltr);
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#endif
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}
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static void stm32_i2c_master_finish(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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#ifdef CONFIG_I2C_STM32_INTERRUPT
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stm32_i2c_disable_transfer_interrupts(dev);
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#endif
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#if defined(CONFIG_I2C_SLAVE)
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struct i2c_stm32_data *data = DEV_DATA(dev);
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data->master_active = false;
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if (!data->slave_attached) {
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LL_I2C_Disable(i2c);
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} else {
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stm32_i2c_enable_transfer_interrupts(dev);
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_ACK);
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}
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#else
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LL_I2C_Disable(i2c);
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#endif
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}
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static inline void msg_init(const struct device *dev, struct i2c_msg *msg,
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uint8_t *next_msg_flags, uint16_t slave,
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uint32_t transfer)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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ARG_UNUSED(next_msg_flags);
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#ifdef CONFIG_I2C_STM32_INTERRUPT
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k_sem_reset(&data->device_sync_sem);
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#endif
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data->current.len = msg->len;
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data->current.buf = msg->buf;
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data->current.flags = msg->flags;
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data->current.is_restart = 0U;
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data->current.is_write = (transfer == I2C_REQUEST_WRITE);
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data->current.is_arlo = 0U;
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data->current.is_err = 0U;
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data->current.is_nack = 0U;
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data->current.msg = msg;
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#if defined(CONFIG_I2C_SLAVE)
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data->master_active = true;
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#endif
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data->slave_address = slave;
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LL_I2C_Enable(i2c);
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LL_I2C_DisableBitPOS(i2c);
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_ACK);
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if (msg->flags & I2C_MSG_RESTART) {
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stm32_i2c_generate_start_condition(i2c);
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}
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}
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static int32_t msg_end(const struct device *dev, uint8_t *next_msg_flags,
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const char *funcname)
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{
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struct i2c_stm32_data *data = DEV_DATA(dev);
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if (data->current.is_nack || data->current.is_err ||
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data->current.is_arlo) {
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goto error;
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}
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if (!next_msg_flags) {
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stm32_i2c_master_finish(dev);
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}
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return 0;
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error:
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if (data->current.is_arlo) {
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LOG_DBG("%s: ARLO %d", funcname,
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data->current.is_arlo);
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data->current.is_arlo = 0U;
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}
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if (data->current.is_nack) {
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LOG_DBG("%s: NACK", funcname);
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data->current.is_nack = 0U;
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}
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if (data->current.is_err) {
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LOG_DBG("%s: ERR %d", funcname,
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data->current.is_err);
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data->current.is_err = 0U;
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}
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stm32_i2c_master_finish(dev);
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return -EIO;
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}
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#ifdef CONFIG_I2C_STM32_INTERRUPT
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static void stm32_i2c_master_mode_end(const struct device *dev)
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{
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struct i2c_stm32_data *data = DEV_DATA(dev);
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k_sem_give(&data->device_sync_sem);
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}
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static inline void handle_sb(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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uint16_t saddr = data->slave_address;
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uint8_t slave;
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if (I2C_ADDR_10_BITS & data->dev_config) {
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slave = (((saddr & 0x0300) >> 7) & 0xFF);
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uint8_t header = slave | HEADER;
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if (data->current.is_restart == 0U) {
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data->current.is_restart = 1U;
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} else {
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header |= I2C_REQUEST_READ;
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data->current.is_restart = 0U;
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}
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LL_I2C_TransmitData8(i2c, header);
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return;
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}
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slave = (saddr << 1) & 0xFF;
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if (data->current.is_write) {
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LL_I2C_TransmitData8(i2c, slave | I2C_REQUEST_WRITE);
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} else {
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LL_I2C_TransmitData8(i2c, slave | I2C_REQUEST_READ);
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if (data->current.len == 2) {
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LL_I2C_EnableBitPOS(i2c);
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}
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}
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}
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static inline void handle_addr(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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if (I2C_ADDR_10_BITS & data->dev_config) {
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if (!data->current.is_write && data->current.is_restart) {
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data->current.is_restart = 0U;
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LL_I2C_ClearFlag_ADDR(i2c);
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stm32_i2c_generate_start_condition(i2c);
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return;
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}
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}
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if (data->current.is_write) {
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LL_I2C_ClearFlag_ADDR(i2c);
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return;
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}
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/* according to STM32F1 errata we need to handle these corner cases in
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* specific way.
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* Please ref to STM32F10xxC/D/E I2C peripheral Errata sheet 2.14.1
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*/
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if (data->current.len == 0U && IS_ENABLED(CONFIG_SOC_SERIES_STM32F1X)) {
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LL_I2C_GenerateStopCondition(i2c);
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} else if (data->current.len == 1U) {
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/* Single byte reception: enable NACK and clear POS */
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
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#ifdef CONFIG_SOC_SERIES_STM32F1X
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LL_I2C_ClearFlag_ADDR(i2c);
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LL_I2C_GenerateStopCondition(i2c);
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#endif
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} else if (data->current.len == 2U) {
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#ifdef CONFIG_SOC_SERIES_STM32F1X
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LL_I2C_ClearFlag_ADDR(i2c);
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#endif
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/* 2-byte reception: enable NACK and set POS */
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
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LL_I2C_EnableBitPOS(i2c);
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}
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LL_I2C_ClearFlag_ADDR(i2c);
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}
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static inline void handle_txe(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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if (data->current.len) {
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data->current.len--;
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if (data->current.len == 0U) {
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/*
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* This is the last byte to transmit disable Buffer
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* interrupt and wait for a BTF interrupt
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*/
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LL_I2C_DisableIT_BUF(i2c);
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}
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LL_I2C_TransmitData8(i2c, *data->current.buf);
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data->current.buf++;
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} else {
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if (data->current.flags & I2C_MSG_STOP) {
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LL_I2C_GenerateStopCondition(i2c);
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}
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if (LL_I2C_IsActiveFlag_BTF(i2c)) {
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/* Read DR to clear BTF flag */
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LL_I2C_ReceiveData8(i2c);
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}
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k_sem_give(&data->device_sync_sem);
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}
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}
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static inline void handle_rxne(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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if (data->current.len > 0) {
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switch (data->current.len) {
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case 1:
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
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LL_I2C_DisableBitPOS(i2c);
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/* Single byte reception */
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if (data->current.flags & I2C_MSG_STOP) {
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LL_I2C_GenerateStopCondition(i2c);
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}
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LL_I2C_DisableIT_BUF(i2c);
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data->current.len--;
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*data->current.buf = LL_I2C_ReceiveData8(i2c);
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data->current.buf++;
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k_sem_give(&data->device_sync_sem);
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break;
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case 2:
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
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LL_I2C_EnableBitPOS(i2c);
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__fallthrough;
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case 3:
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/*
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* 2-byte, 3-byte reception and for N-2, N-1,
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* N when N > 3
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*/
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LL_I2C_DisableIT_BUF(i2c);
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break;
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default:
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/* N byte reception when N > 3 */
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data->current.len--;
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*data->current.buf = LL_I2C_ReceiveData8(i2c);
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data->current.buf++;
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}
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} else {
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if (data->current.flags & I2C_MSG_STOP) {
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LL_I2C_GenerateStopCondition(i2c);
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}
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k_sem_give(&data->device_sync_sem);
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}
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}
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static inline void handle_btf(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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if (data->current.is_write) {
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handle_txe(dev);
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} else {
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uint32_t counter = 0U;
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switch (data->current.len) {
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case 2:
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/*
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* Stop condition must be generated before reading the
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* last two bytes.
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*/
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if (data->current.flags & I2C_MSG_STOP) {
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LL_I2C_GenerateStopCondition(i2c);
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}
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for (counter = 2U; counter > 0; counter--) {
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data->current.len--;
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*data->current.buf = LL_I2C_ReceiveData8(i2c);
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data->current.buf++;
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}
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k_sem_give(&data->device_sync_sem);
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break;
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case 3:
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/* Set NACK before reading N-2 byte*/
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
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data->current.len--;
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*data->current.buf = LL_I2C_ReceiveData8(i2c);
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data->current.buf++;
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break;
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default:
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handle_rxne(dev);
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}
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}
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}
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#if defined(CONFIG_I2C_SLAVE)
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static void stm32_i2c_slave_event(const struct device *dev)
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{
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const struct i2c_stm32_config *cfg = DEV_CFG(dev);
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struct i2c_stm32_data *data = DEV_DATA(dev);
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I2C_TypeDef *i2c = cfg->i2c;
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const struct i2c_slave_callbacks *slave_cb =
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data->slave_cfg->callbacks;
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if (LL_I2C_IsActiveFlag_TXE(i2c) && LL_I2C_IsActiveFlag_BTF(i2c)) {
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uint8_t val;
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slave_cb->read_processed(data->slave_cfg, &val);
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LL_I2C_TransmitData8(i2c, val);
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return;
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}
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if (LL_I2C_IsActiveFlag_RXNE(i2c)) {
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uint8_t val = LL_I2C_ReceiveData8(i2c);
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if (slave_cb->write_received(data->slave_cfg, val)) {
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
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}
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return;
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}
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if (LL_I2C_IsActiveFlag_AF(i2c)) {
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LL_I2C_ClearFlag_AF(i2c);
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}
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if (LL_I2C_IsActiveFlag_STOP(i2c)) {
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LL_I2C_ClearFlag_STOP(i2c);
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slave_cb->stop(data->slave_cfg);
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/* Prepare to ACK next transmissions address byte */
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LL_I2C_AcknowledgeNextData(i2c, LL_I2C_ACK);
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}
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if (LL_I2C_IsActiveFlag_ADDR(i2c)) {
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uint32_t dir = LL_I2C_GetTransferDirection(i2c);
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if (dir == LL_I2C_DIRECTION_READ) {
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slave_cb->write_requested(data->slave_cfg);
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LL_I2C_EnableIT_RX(i2c);
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} else {
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uint8_t val;
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slave_cb->read_requested(data->slave_cfg, &val);
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LL_I2C_TransmitData8(i2c, val);
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LL_I2C_EnableIT_TX(i2c);
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}
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stm32_i2c_enable_transfer_interrupts(dev);
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}
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|
}
|
|
|
|
/* Attach and start I2C as slave */
|
|
int i2c_stm32_slave_register(const struct device *dev,
|
|
struct i2c_slave_config *config)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
uint32_t bitrate_cfg;
|
|
int ret;
|
|
|
|
if (!config) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (data->slave_attached) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (data->master_active) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
bitrate_cfg = i2c_map_dt_bitrate(cfg->bitrate);
|
|
|
|
ret = i2c_stm32_runtime_configure(dev, bitrate_cfg);
|
|
if (ret < 0) {
|
|
LOG_ERR("i2c: failure initializing");
|
|
return ret;
|
|
}
|
|
|
|
data->slave_cfg = config;
|
|
|
|
LL_I2C_Enable(i2c);
|
|
|
|
LL_I2C_SetOwnAddress1(i2c, config->address << 1,
|
|
LL_I2C_OWNADDRESS1_7BIT);
|
|
|
|
data->slave_attached = true;
|
|
|
|
LOG_DBG("i2c: slave registered");
|
|
|
|
stm32_i2c_enable_transfer_interrupts(dev);
|
|
LL_I2C_AcknowledgeNextData(i2c, LL_I2C_ACK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i2c_stm32_slave_unregister(const struct device *dev,
|
|
struct i2c_slave_config *config)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
|
|
if (!data->slave_attached) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (data->master_active) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
stm32_i2c_disable_transfer_interrupts(dev);
|
|
|
|
LL_I2C_ClearFlag_AF(i2c);
|
|
LL_I2C_ClearFlag_STOP(i2c);
|
|
LL_I2C_ClearFlag_ADDR(i2c);
|
|
|
|
LL_I2C_Disable(i2c);
|
|
|
|
data->slave_attached = false;
|
|
|
|
LOG_DBG("i2c: slave unregistered");
|
|
|
|
return 0;
|
|
}
|
|
#endif /* defined(CONFIG_I2C_SLAVE) */
|
|
|
|
void stm32_i2c_event_isr(void *arg)
|
|
{
|
|
const struct device *dev = (const struct device *)arg;
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
|
|
#if defined(CONFIG_I2C_SLAVE)
|
|
if (data->slave_attached && !data->master_active) {
|
|
stm32_i2c_slave_event(dev);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
if (LL_I2C_IsActiveFlag_SB(i2c)) {
|
|
handle_sb(dev);
|
|
} else if (LL_I2C_IsActiveFlag_ADD10(i2c)) {
|
|
LL_I2C_TransmitData8(i2c, data->slave_address);
|
|
} else if (LL_I2C_IsActiveFlag_ADDR(i2c)) {
|
|
handle_addr(dev);
|
|
} else if (LL_I2C_IsActiveFlag_BTF(i2c)) {
|
|
handle_btf(dev);
|
|
} else if (LL_I2C_IsActiveFlag_TXE(i2c) && data->current.is_write) {
|
|
handle_txe(dev);
|
|
} else if (LL_I2C_IsActiveFlag_RXNE(i2c) && !data->current.is_write) {
|
|
handle_rxne(dev);
|
|
}
|
|
}
|
|
|
|
void stm32_i2c_error_isr(void *arg)
|
|
{
|
|
const struct device *dev = (const struct device *)arg;
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
|
|
#if defined(CONFIG_I2C_SLAVE)
|
|
if (data->slave_attached && !data->master_active) {
|
|
/* No need for a slave error function right now. */
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
if (LL_I2C_IsActiveFlag_AF(i2c)) {
|
|
LL_I2C_ClearFlag_AF(i2c);
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_nack = 1U;
|
|
goto end;
|
|
}
|
|
if (LL_I2C_IsActiveFlag_ARLO(i2c)) {
|
|
LL_I2C_ClearFlag_ARLO(i2c);
|
|
data->current.is_arlo = 1U;
|
|
goto end;
|
|
}
|
|
|
|
if (LL_I2C_IsActiveFlag_BERR(i2c)) {
|
|
LL_I2C_ClearFlag_BERR(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
return;
|
|
end:
|
|
stm32_i2c_master_mode_end(dev);
|
|
}
|
|
|
|
int32_t stm32_i2c_msg_write(const struct device *dev, struct i2c_msg *msg,
|
|
uint8_t *next_msg_flags, uint16_t saddr)
|
|
{
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
|
|
msg_init(dev, msg, next_msg_flags, saddr, I2C_REQUEST_WRITE);
|
|
|
|
stm32_i2c_enable_transfer_interrupts(dev);
|
|
|
|
if (k_sem_take(&data->device_sync_sem,
|
|
K_MSEC(STM32_I2C_TRANSFER_TIMEOUT_MSEC)) != 0) {
|
|
LOG_DBG("%s: WRITE timeout", __func__);
|
|
stm32_i2c_reset(dev);
|
|
return -EIO;
|
|
}
|
|
|
|
return msg_end(dev, next_msg_flags, __func__);
|
|
}
|
|
|
|
int32_t stm32_i2c_msg_read(const struct device *dev, struct i2c_msg *msg,
|
|
uint8_t *next_msg_flags, uint16_t saddr)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
|
|
msg_init(dev, msg, next_msg_flags, saddr, I2C_REQUEST_READ);
|
|
|
|
stm32_i2c_enable_transfer_interrupts(dev);
|
|
LL_I2C_EnableIT_RX(i2c);
|
|
|
|
if (k_sem_take(&data->device_sync_sem,
|
|
K_MSEC(STM32_I2C_TRANSFER_TIMEOUT_MSEC)) != 0) {
|
|
LOG_DBG("%s: READ timeout", __func__);
|
|
stm32_i2c_reset(dev);
|
|
return -EIO;
|
|
}
|
|
|
|
return msg_end(dev, next_msg_flags, __func__);
|
|
}
|
|
|
|
#else /* CONFIG_I2C_STM32_INTERRUPT */
|
|
|
|
static inline int check_errors(const struct device *dev, const char *funcname)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
|
|
if (LL_I2C_IsActiveFlag_AF(i2c)) {
|
|
LL_I2C_ClearFlag_AF(i2c);
|
|
LOG_DBG("%s: NACK", funcname);
|
|
data->current.is_nack = 1U;
|
|
goto error;
|
|
}
|
|
|
|
if (LL_I2C_IsActiveFlag_ARLO(i2c)) {
|
|
LL_I2C_ClearFlag_ARLO(i2c);
|
|
LOG_DBG("%s: ARLO", funcname);
|
|
data->current.is_arlo = 1U;
|
|
goto error;
|
|
}
|
|
|
|
if (LL_I2C_IsActiveFlag_OVR(i2c)) {
|
|
LL_I2C_ClearFlag_OVR(i2c);
|
|
LOG_DBG("%s: OVR", funcname);
|
|
data->current.is_err = 1U;
|
|
goto error;
|
|
}
|
|
|
|
if (LL_I2C_IsActiveFlag_BERR(i2c)) {
|
|
LL_I2C_ClearFlag_BERR(i2c);
|
|
LOG_DBG("%s: BERR", funcname);
|
|
data->current.is_err = 1U;
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
error:
|
|
return -EIO;
|
|
}
|
|
|
|
static int stm32_i2c_wait_timeout(uint16_t *timeout)
|
|
{
|
|
if (*timeout == 0) {
|
|
return 1;
|
|
} else {
|
|
k_busy_wait(1);
|
|
(*timeout)--;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int32_t stm32_i2c_msg_write(const struct device *dev, struct i2c_msg *msg,
|
|
uint8_t *next_msg_flags, uint16_t saddr)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
uint32_t len = msg->len;
|
|
uint16_t timeout;
|
|
uint8_t *buf = msg->buf;
|
|
int32_t res;
|
|
|
|
msg_init(dev, msg, next_msg_flags, saddr, I2C_REQUEST_WRITE);
|
|
|
|
if (msg->flags & I2C_MSG_RESTART) {
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_SB(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
if (I2C_ADDR_10_BITS & data->dev_config) {
|
|
uint8_t slave = (((saddr & 0x0300) >> 7) & 0xFF);
|
|
uint8_t header = slave | HEADER;
|
|
|
|
LL_I2C_TransmitData8(i2c, header);
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_ADD10(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
slave = data->slave_address & 0xFF;
|
|
LL_I2C_TransmitData8(i2c, slave);
|
|
} else {
|
|
uint8_t slave = (saddr << 1) & 0xFF;
|
|
|
|
LL_I2C_TransmitData8(i2c, slave | I2C_REQUEST_WRITE);
|
|
}
|
|
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_ADDR(i2c)) {
|
|
if (LL_I2C_IsActiveFlag_AF(i2c) || stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_ClearFlag_AF(i2c);
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_nack = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
LL_I2C_ClearFlag_ADDR(i2c);
|
|
}
|
|
|
|
while (len) {
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (1) {
|
|
if (LL_I2C_IsActiveFlag_TXE(i2c)) {
|
|
break;
|
|
}
|
|
if (LL_I2C_IsActiveFlag_AF(i2c) || stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_ClearFlag_AF(i2c);
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_nack = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
LL_I2C_TransmitData8(i2c, *buf);
|
|
buf++;
|
|
len--;
|
|
}
|
|
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_BTF(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
if (msg->flags & I2C_MSG_STOP) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
}
|
|
|
|
end:
|
|
check_errors(dev, __func__);
|
|
res = msg_end(dev, next_msg_flags, __func__);
|
|
if (res < 0) {
|
|
stm32_i2c_reset(dev);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
int32_t stm32_i2c_msg_read(const struct device *dev, struct i2c_msg *msg,
|
|
uint8_t *next_msg_flags, uint16_t saddr)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
uint32_t len = msg->len;
|
|
uint16_t timeout;
|
|
uint8_t *buf = msg->buf;
|
|
int32_t res;
|
|
|
|
msg_init(dev, msg, next_msg_flags, saddr, I2C_REQUEST_READ);
|
|
|
|
if (msg->flags & I2C_MSG_RESTART) {
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_SB(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
if (I2C_ADDR_10_BITS & data->dev_config) {
|
|
uint8_t slave = (((saddr & 0x0300) >> 7) & 0xFF);
|
|
uint8_t header = slave | HEADER;
|
|
|
|
LL_I2C_TransmitData8(i2c, header);
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_ADD10(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
slave = saddr & 0xFF;
|
|
LL_I2C_TransmitData8(i2c, slave);
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_ADDR(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
LL_I2C_ClearFlag_ADDR(i2c);
|
|
stm32_i2c_generate_start_condition(i2c);
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_SB(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
header |= I2C_REQUEST_READ;
|
|
LL_I2C_TransmitData8(i2c, header);
|
|
} else {
|
|
uint8_t slave = ((saddr) << 1) & 0xFF;
|
|
|
|
LL_I2C_TransmitData8(i2c, slave | I2C_REQUEST_READ);
|
|
}
|
|
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_ADDR(i2c)) {
|
|
if (LL_I2C_IsActiveFlag_AF(i2c) || stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_ClearFlag_AF(i2c);
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_nack = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
/* ADDR must be cleared before NACK generation. Either in 2 byte reception
|
|
* byte 1 will be NACK'ed and slave wont sent the last byte
|
|
*/
|
|
LL_I2C_ClearFlag_ADDR(i2c);
|
|
if (len == 1U) {
|
|
/* Single byte reception: enable NACK and set STOP */
|
|
LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
|
|
} else if (len == 2U) {
|
|
/* 2-byte reception: enable NACK and set POS */
|
|
LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
|
|
LL_I2C_EnableBitPOS(i2c);
|
|
}
|
|
}
|
|
|
|
while (len) {
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
while (!LL_I2C_IsActiveFlag_RXNE(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
timeout = STM32_I2C_TIMEOUT_USEC;
|
|
switch (len) {
|
|
case 1:
|
|
if (msg->flags & I2C_MSG_STOP) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
}
|
|
len--;
|
|
*buf = LL_I2C_ReceiveData8(i2c);
|
|
buf++;
|
|
break;
|
|
case 2:
|
|
while (!LL_I2C_IsActiveFlag_BTF(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Stop condition must be generated before reading the
|
|
* last two bytes.
|
|
*/
|
|
if (msg->flags & I2C_MSG_STOP) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
}
|
|
|
|
for (uint32_t counter = 2; counter > 0; counter--) {
|
|
len--;
|
|
*buf = LL_I2C_ReceiveData8(i2c);
|
|
buf++;
|
|
}
|
|
|
|
break;
|
|
case 3:
|
|
while (!LL_I2C_IsActiveFlag_BTF(i2c)) {
|
|
if (stm32_i2c_wait_timeout(&timeout)) {
|
|
LL_I2C_GenerateStopCondition(i2c);
|
|
data->current.is_err = 1U;
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
/* Set NACK before reading N-2 byte*/
|
|
LL_I2C_AcknowledgeNextData(i2c, LL_I2C_NACK);
|
|
__fallthrough;
|
|
default:
|
|
len--;
|
|
*buf = LL_I2C_ReceiveData8(i2c);
|
|
buf++;
|
|
}
|
|
}
|
|
end:
|
|
check_errors(dev, __func__);
|
|
res = msg_end(dev, next_msg_flags, __func__);
|
|
if (res < 0) {
|
|
stm32_i2c_reset(dev);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif /* CONFIG_I2C_STM32_INTERRUPT */
|
|
|
|
int32_t stm32_i2c_configure_timing(const struct device *dev, uint32_t clock)
|
|
{
|
|
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
|
|
struct i2c_stm32_data *data = DEV_DATA(dev);
|
|
I2C_TypeDef *i2c = cfg->i2c;
|
|
|
|
switch (I2C_SPEED_GET(data->dev_config)) {
|
|
case I2C_SPEED_STANDARD:
|
|
LL_I2C_ConfigSpeed(i2c, clock, 100000, LL_I2C_DUTYCYCLE_2);
|
|
break;
|
|
case I2C_SPEED_FAST:
|
|
LL_I2C_ConfigSpeed(i2c, clock, 400000, LL_I2C_DUTYCYCLE_2);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|