b luo
mbed library sources. With a patch for the can_api
Fork of
mbed-dev
by 
mbed official
Diff: targets/TARGET_STM/TARGET_STM32F4/i2c_api.c
- Revision:
- 149:156823d33999
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F4/i2c_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,774 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2015, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * 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.
+ *******************************************************************************
+ */
+#include "mbed_assert.h"
+#include "i2c_api.h"
+
+#if DEVICE_I2C
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+
+/* Timeout values for flags and events waiting loops. These timeouts are
+ not based on accurate values, they just guarantee that the application will
+ not remain stuck if the I2C communication is corrupted. */
+#define FLAG_TIMEOUT ((int)0x1000)
+#define LONG_TIMEOUT ((int)0x8000)
+
+int i2c1_inited = 0;
+int i2c2_inited = 0;
+int i2c3_inited = 0;
+int fmpi2c1_inited = 0;
+
+#if DEVICE_I2C_ASYNCH
+ #define I2C_S(obj) (struct i2c_s *) (&((obj)->i2c))
+#else
+ #define I2C_S(obj) (struct i2c_s *) (obj)
+#endif
+
+
+void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+
+ // Determine the I2C to use
+ I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
+ I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
+
+ obj_s->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
+ MBED_ASSERT(obj_s->i2c != (I2CName)NC);
+
+ // Enable I2C1 clock and pinout if not done
+ if ((obj_s->i2c == I2C_1) && !i2c1_inited) {
+ i2c1_inited = 1;
+ // Configure I2C pins
+ pinmap_pinout(sda, PinMap_I2C_SDA);
+ pinmap_pinout(scl, PinMap_I2C_SCL);
+ pin_mode(sda, PullUp);
+ pin_mode(scl, PullUp);
+#if DEVICE_I2C_ASYNCH
+ obj_s->event_i2cIRQ = I2C1_EV_IRQn;
+ obj_s->error_i2cIRQ = I2C1_ER_IRQn;
+#endif
+ __I2C1_CLK_ENABLE();
+ }
+ // Enable I2C2 clock and pinout if not done
+ if ((obj_s->i2c == I2C_2) && !i2c2_inited) {
+ i2c2_inited = 1;
+ // Configure I2C pins
+ pinmap_pinout(sda, PinMap_I2C_SDA);
+ pinmap_pinout(scl, PinMap_I2C_SCL);
+ pin_mode(sda, PullUp);
+ pin_mode(scl, PullUp);
+#if DEVICE_I2C_ASYNCH
+ obj_s->event_i2cIRQ = I2C2_EV_IRQn;
+ obj_s->error_i2cIRQ = I2C2_ER_IRQn;
+#endif
+ __I2C2_CLK_ENABLE();
+ }
+#if defined I2C3_BASE
+ // Enable I2C3 clock and pinout if not done
+ if ((obj_s->i2c == I2C_3) && !i2c3_inited) {
+ i2c3_inited = 1;
+ // Configure I2C pins
+ pinmap_pinout(sda, PinMap_I2C_SDA);
+ pinmap_pinout(scl, PinMap_I2C_SCL);
+ pin_mode(sda, PullUp);
+ pin_mode(scl, PullUp);
+#if DEVICE_I2C_ASYNCH
+ obj_s->event_i2cIRQ = I2C3_EV_IRQn;
+ obj_s->error_i2cIRQ = I2C3_ER_IRQn;
+#endif
+ __I2C3_CLK_ENABLE();
+ }
+#endif
+
+#if defined FMPI2C1_BASE
+ // Enable I2C3 clock and pinout if not done
+ if ((obj_s->i2c == FMPI2C_1) && !fmpi2c1_inited) {
+ fmpi2c1_inited = 1;
+ // Configure I2C pins
+ pinmap_pinout(sda, PinMap_I2C_SDA);
+ pinmap_pinout(scl, PinMap_I2C_SCL);
+ pin_mode(sda, PullUp);
+ pin_mode(scl, PullUp);
+#if DEVICE_I2C_ASYNCH
+ obj_s->event_i2cIRQ = FMPI2C1_EV_IRQn;
+ obj_s->error_i2cIRQ = FMPI2C1_ER_IRQn;
+#endif
+ __HAL_RCC_FMPI2C1_CLK_ENABLE();
+ }
+#endif
+
+ // Reset to clear pending flags if any
+ i2c_reset(obj);
+
+ // I2C configuration
+ i2c_frequency(obj, 100000); // 100 kHz per default
+
+#if DEVICE_I2CSLAVE
+ // I2C master by default
+ obj_s->slave = 0;
+#endif
+
+#if DEVICE_I2C_ASYNCH
+ // I2C Xfer operation init
+ obj_s->XferOperation = I2C_FIRST_AND_LAST_FRAME;
+#endif
+}
+
+void i2c_frequency(i2c_t *obj, int hz)
+{
+
+ int timeout;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ MBED_ASSERT((hz > 0) && (hz <= 400000));
+
+ // wait before init
+ timeout = LONG_TIMEOUT;
+ while ((__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY)) && (timeout-- != 0));
+
+ // I2C configuration
+ handle->Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
+ handle->Init.ClockSpeed = hz;
+ handle->Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
+ handle->Init.DutyCycle = I2C_DUTYCYCLE_2;
+ handle->Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
+ handle->Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
+ handle->Init.OwnAddress1 = 0;
+ handle->Init.OwnAddress2 = 0;
+ HAL_I2C_Init(handle);
+
+#if DEVICE_I2CSLAVE
+ if (obj_s->slave) {
+ /* Enable Address Acknowledge */
+ handle->Instance->CR1 |= I2C_CR1_ACK;
+ }
+#endif
+
+}
+
+inline int i2c_start(i2c_t *obj) {
+
+ int timeout;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ // Clear Acknowledge failure flag
+ __HAL_I2C_CLEAR_FLAG(handle, I2C_FLAG_AF);
+
+ // Wait the STOP condition has been previously correctly sent
+ // This timeout can be avoid in some specific cases by simply clearing the STOP bit
+ timeout = FLAG_TIMEOUT;
+ while ((handle->Instance->CR1 & I2C_CR1_STOP) == I2C_CR1_STOP) {
+ if ((timeout--) == 0) {
+ return 1;
+ }
+ }
+
+ // Generate the START condition
+ handle->Instance->CR1 |= I2C_CR1_START;
+
+ // Wait the START condition has been correctly sent
+ timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_SB) == RESET) {
+ if ((timeout--) == 0) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+inline int i2c_stop(i2c_t *obj) {
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_TypeDef *i2c = (I2C_TypeDef *)obj_s->i2c;
+
+ // Generate the STOP condition
+ i2c->CR1 |= I2C_CR1_STOP;
+
+ return 0;
+}
+
+int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
+
+ int timeout;
+ int count;
+ int value;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ i2c_start(obj);
+
+ // Wait until SB flag is set
+ timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_SB) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return -1;
+ }
+ }
+
+ handle->Instance->DR = __HAL_I2C_7BIT_ADD_READ(address);
+
+ // Wait address is acknowledged
+ timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_ADDR) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return -1;
+ }
+ }
+ __HAL_I2C_CLEAR_ADDRFLAG(handle);
+
+ // Read all bytes except last one
+ for (count = 0; count < (length - 1); count++) {
+ value = i2c_byte_read(obj, 0);
+ data[count] = (char)value;
+ }
+
+ // If not repeated start, send stop.
+ // Warning: must be done BEFORE the data is read.
+ if (stop) {
+ i2c_stop(obj);
+ }
+
+ // Read the last byte
+ value = i2c_byte_read(obj, 1);
+ data[count] = (char)value;
+
+ return length;
+}
+
+int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
+
+ int timeout;
+ int count;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ i2c_start(obj);
+
+ // Wait until SB flag is set
+ timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_SB) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return -1;
+ }
+ }
+
+ handle->Instance->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
+
+ // Wait address is acknowledged
+ timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_ADDR) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return -1;
+ }
+ }
+ __HAL_I2C_CLEAR_ADDRFLAG(handle);
+
+ for (count = 0; count < length; count++) {
+ if (i2c_byte_write(obj, data[count]) != 1) {
+ i2c_stop(obj);
+ return -1;
+ }
+ }
+
+ // If not repeated start, send stop.
+ if (stop) {
+ i2c_stop(obj);
+ }
+
+ return count;
+}
+
+int i2c_byte_read(i2c_t *obj, int last) {
+
+ int timeout;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ if (last) {
+ // Don't acknowledge the last byte
+ handle->Instance->CR1 &= ~I2C_CR1_ACK;
+ } else {
+ // Acknowledge the byte
+ handle->Instance->CR1 |= I2C_CR1_ACK;
+ }
+
+ // Wait until the byte is received
+ timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_RXNE) == RESET) {
+ if ((timeout--) == 0) {
+ return -1;
+ }
+ }
+
+ return (int)handle->Instance->DR;
+}
+
+int i2c_byte_write(i2c_t *obj, int data) {
+
+ int timeout;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ handle->Instance->DR = (uint8_t)data;
+
+ // Wait until the byte (might be the address) is transmitted
+ timeout = FLAG_TIMEOUT;
+ while ((__HAL_I2C_GET_FLAG(handle, I2C_FLAG_TXE) == RESET) &&
+ (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BTF) == RESET) &&
+ (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_ADDR) == RESET)) {
+ if ((timeout--) == 0) {
+ return 0;
+ }
+ }
+
+ if (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_ADDR) != RESET)
+ {
+ __HAL_I2C_CLEAR_ADDRFLAG(handle);
+ }
+
+ return 1;
+}
+
+void i2c_reset(i2c_t *obj) {
+
+ int timeout;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ handle->Instance = (I2C_TypeDef *)(obj_s->i2c);
+
+ // wait before reset
+ timeout = LONG_TIMEOUT;
+ while ((__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY)) && (timeout-- != 0));
+
+ if (obj_s->i2c == I2C_1) {
+ __I2C1_FORCE_RESET();
+ __I2C1_RELEASE_RESET();
+ }
+
+ if (obj_s->i2c == I2C_2) {
+ __I2C2_FORCE_RESET();
+ __I2C2_RELEASE_RESET();
+ }
+#if defined I2C3_BASE
+ if (obj_s->i2c == I2C_3) {
+ __I2C3_FORCE_RESET();
+ __I2C3_RELEASE_RESET();
+ }
+#endif
+
+#if defined FMPI2C1_BASE
+ if (obj_s->i2c == FMPI2C_1) {
+ __HAL_RCC_FMPI2C1_FORCE_RESET();
+ __HAL_RCC_FMPI2C1_RELEASE_RESET();
+ }
+#endif
+}
+
+#if DEVICE_I2CSLAVE
+
+void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
+
+ uint16_t tmpreg = 0;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_TypeDef *i2c = (I2C_TypeDef *)obj_s->i2c;
+
+ // Get the old register value
+ tmpreg = i2c->OAR1;
+ // Reset address bits
+ tmpreg &= 0xFC00;
+ // Set new address
+ tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
+ // Store the new register value
+ i2c->OAR1 = tmpreg;
+}
+
+void i2c_slave_mode(i2c_t *obj, int enable_slave) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_TypeDef *i2c = (I2C_TypeDef *)obj_s->i2c;
+
+ if (enable_slave) {
+ obj_s->slave = 1;
+
+ /* Enable Address Acknowledge */
+ i2c->CR1 |= I2C_CR1_ACK;
+ }
+}
+
+// See I2CSlave.h
+#define NoData 0 // the slave has not been addressed
+#define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
+#define WriteGeneral 2 // the master is writing to all slave
+#define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
+
+int i2c_slave_receive(i2c_t *obj) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ int retValue = NoData;
+
+ /* Reading BUSY flag before ADDR flag could clear ADDR */
+ int addr = __HAL_I2C_GET_FLAG(handle, I2C_FLAG_ADDR);
+
+ if (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY) == 1) {
+ if (addr == 1) {
+ if (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_TRA) == 1) {
+ retValue = ReadAddressed;
+ } else {
+ retValue = WriteAddressed;
+ }
+ __HAL_I2C_CLEAR_ADDRFLAG(handle);
+ }
+ }
+
+ return (retValue);
+}
+
+int i2c_slave_read(i2c_t *obj, char *data, int length) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ uint32_t Timeout;
+ int size = 0;
+
+ while (length > 0) {
+
+ /* Wait until RXNE flag is set */
+ // Wait until the byte is received
+ Timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_RXNE) == RESET) {
+ Timeout--;
+ if (Timeout == 0) {
+ return -1;
+ }
+ }
+
+ /* Read data from DR */
+ (*data++) = handle->Instance->DR;
+ length--;
+ size++;
+
+ if ((__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BTF) == SET) && (length != 0)) {
+ /* Read data from DR */
+ (*data++) = handle->Instance->DR;
+ length--;
+ size++;
+ }
+ }
+
+ /* Wait until STOP flag is set */
+ Timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_STOPF) == RESET) {
+ Timeout--;
+ if (Timeout == 0) {
+ return -1;
+ }
+ }
+
+ /* Clear STOP flag */
+ __HAL_I2C_CLEAR_STOPFLAG(handle);
+
+ /* Wait until BUSY flag is reset */
+ Timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY) == SET) {
+ Timeout--;
+ if (Timeout == 0) {
+ return -1;
+ }
+ }
+
+ return size;
+}
+
+int i2c_slave_write(i2c_t *obj, const char *data, int length) {
+
+ uint32_t Timeout;
+ int size = 0;
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ while (length > 0) {
+ /* Wait until TXE flag is set */
+ Timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_TXE) == RESET) {
+ Timeout--;
+ if (Timeout == 0) {
+ return -1;
+ }
+ }
+
+ /* Write data to DR */
+ handle->Instance->DR = (*data++);
+ length--;
+ size++;
+
+ if ((__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BTF) == SET) && (length != 0)) {
+ /* Write data to DR */
+ handle->Instance->DR = (*data++);
+ length--;
+ size++;
+ }
+ }
+
+ /* Wait until AF flag is set */
+ Timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_AF) == RESET) {
+ Timeout--;
+ if (Timeout == 0) {
+ return -1;
+ }
+ }
+
+ /* Clear AF flag */
+ __HAL_I2C_CLEAR_FLAG(handle, I2C_FLAG_AF);
+
+
+ /* Wait until BUSY flag is reset */
+ Timeout = FLAG_TIMEOUT;
+ while (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY) == SET) {
+ Timeout--;
+ if (Timeout == 0) {
+ return -1;
+ }
+ }
+
+ handle->State = HAL_I2C_STATE_READY;
+
+ /* Process Unlocked */
+ __HAL_UNLOCK(handle);
+
+ return size;
+}
+
+#endif // DEVICE_I2CSLAVE
+
+#if DEVICE_I2C_ASYNCH
+
+
+i2c_t *get_i2c_obj(I2C_HandleTypeDef *hi2c){
+
+ /* Aim of the function is to get i2c_s pointer using hi2c pointer */
+ /* Highly inspired from magical linux kernel's "container_of" */
+ /* (which was not directly used since not compatible with IAR toolchain) */
+ struct i2c_s *obj_s;
+ i2c_t *obj;
+
+ obj_s = (struct i2c_s *)( (char *)hi2c - offsetof(struct i2c_s,handle));
+ obj = (i2c_t *)( (char *)obj_s - offsetof(i2c_t,i2c));
+
+ return (obj);
+}
+
+void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *hi2c){
+ /* Get object ptr based on handler ptr */
+ i2c_t *obj = get_i2c_obj(hi2c);
+ struct i2c_s *obj_s = I2C_S(obj);
+
+ /* Handle potential Tx/Rx use case */
+ if ((obj->tx_buff.length) && (obj->rx_buff.length)) {
+
+ if (obj_s->stop) {
+ obj_s->XferOperation = I2C_LAST_FRAME;
+ }
+ else {
+ obj_s->XferOperation = I2C_NEXT_FRAME;
+ }
+
+ HAL_I2C_Master_Sequential_Receive_IT(hi2c, obj_s->address, (uint8_t*)obj->rx_buff.buffer , obj->rx_buff.length, obj_s->XferOperation);
+ }
+ else {
+ /* Set event flag */
+ obj_s->event = I2C_EVENT_TRANSFER_COMPLETE;
+ }
+
+}
+
+void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *hi2c){
+ /* Get object ptr based on handler ptr */
+ i2c_t *obj = get_i2c_obj(hi2c);
+ struct i2c_s *obj_s = I2C_S(obj);
+
+ /* Set event flag */
+ obj_s->event = I2C_EVENT_TRANSFER_COMPLETE;
+}
+
+void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c){
+ /* Get object ptr based on handler ptr */
+ i2c_t *obj = get_i2c_obj(hi2c);
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ /* Disable IT. Not always done before calling macro */
+ __HAL_I2C_DISABLE_IT(handle, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR);
+
+ /* Set event flag */
+ obj_s->event = I2C_EVENT_ERROR;
+}
+
+void HAL_I2C_AbortCpltCallback(I2C_HandleTypeDef *hi2c){
+ /* Get object ptr based on handler ptr */
+ i2c_t *obj = get_i2c_obj(hi2c);
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ /* Disable IT. Not always done before calling macro */
+ __HAL_I2C_DISABLE_IT(handle, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR);
+
+ /* Set event flag */
+ obj_s->event = I2C_EVENT_ERROR;
+}
+
+
+
+void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint) {
+
+ // TODO: DMA usage is currently ignored by this way
+ (void) hint;
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ /* Update object */
+ obj->tx_buff.buffer = (void *)tx;
+ obj->tx_buff.length = tx_length;
+ obj->tx_buff.pos = 0;
+ obj->tx_buff.width = 8;
+
+ obj->rx_buff.buffer = (void *)rx;
+ obj->rx_buff.length = rx_length;
+ obj->rx_buff.pos = SIZE_MAX;
+ obj->rx_buff.width = 8;
+
+ obj_s->available_events = event;
+ obj_s->event = 0;
+ obj_s->address = address;
+ obj_s->stop = stop;
+
+ IRQn_Type irq_event_n = obj_s->event_i2cIRQ;
+ IRQn_Type irq_error_n = obj_s->error_i2cIRQ;
+
+ /* Set up event IT using IRQ and handler tables */
+ NVIC_SetVector(irq_event_n, handler);
+ HAL_NVIC_SetPriority(irq_event_n, 0, 1);
+ HAL_NVIC_EnableIRQ(irq_event_n);
+
+ /* Set up error IT using IRQ and handler tables */
+ NVIC_SetVector(irq_error_n, handler);
+ HAL_NVIC_SetPriority(irq_error_n, 0, 0);
+ HAL_NVIC_EnableIRQ(irq_error_n);
+
+ /* Set operation step depending if stop sending required or not */
+ if ((tx_length && !rx_length) || (!tx_length && rx_length)) {
+ if ((obj_s->XferOperation == I2C_FIRST_AND_LAST_FRAME) ||
+ (obj_s->XferOperation == I2C_LAST_FRAME)) {
+ if (stop)
+ obj_s->XferOperation = I2C_FIRST_AND_LAST_FRAME;
+ else
+ obj_s->XferOperation = I2C_FIRST_FRAME;
+ } else if ((obj_s->XferOperation == I2C_FIRST_FRAME) ||
+ (obj_s->XferOperation == I2C_NEXT_FRAME)) {
+ if (stop)
+ obj_s->XferOperation = I2C_LAST_FRAME;
+ else
+ obj_s->XferOperation = I2C_NEXT_FRAME;
+ }
+
+ if (tx_length > 0) {
+ HAL_I2C_Master_Sequential_Transmit_IT(handle, address, (uint8_t*)tx, tx_length, obj_s->XferOperation);
+ }
+ if (rx_length > 0) {
+ HAL_I2C_Master_Sequential_Receive_IT(handle, address, (uint8_t*)rx, rx_length, obj_s->XferOperation);
+ }
+ }
+ else if (tx_length && rx_length) {
+ /* Two steps operation, don't modify XferOperation, keep it for next step */
+ if ((obj_s->XferOperation == I2C_FIRST_AND_LAST_FRAME) ||
+ (obj_s->XferOperation == I2C_LAST_FRAME)) {
+ HAL_I2C_Master_Sequential_Transmit_IT(handle, address, (uint8_t*)tx, tx_length, I2C_FIRST_FRAME);
+ } else if ((obj_s->XferOperation == I2C_FIRST_FRAME) ||
+ (obj_s->XferOperation == I2C_NEXT_FRAME)) {
+ HAL_I2C_Master_Sequential_Transmit_IT(handle, address, (uint8_t*)tx, tx_length, I2C_NEXT_FRAME);
+ }
+ }
+}
+
+
+uint32_t i2c_irq_handler_asynch(i2c_t *obj) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ HAL_I2C_EV_IRQHandler(handle);
+ HAL_I2C_ER_IRQHandler(handle);
+
+ /* Return I2C event status */
+ return (obj_s->event & obj_s->available_events);
+}
+
+uint8_t i2c_active(i2c_t *obj) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ if (handle->State == HAL_I2C_STATE_READY) {
+ return 0;
+ }
+ else {
+ return 1;
+ }
+}
+
+void i2c_abort_asynch(i2c_t *obj) {
+
+ struct i2c_s *obj_s = I2C_S(obj);
+ I2C_HandleTypeDef *handle = &(obj_s->handle);
+
+ /* Abort HAL requires DevAddress, but is not used. Use Dummy */
+ uint16_t Dummy_DevAddress = 0x00;
+
+ HAL_I2C_Master_Abort_IT(handle, Dummy_DevAddress);
+}
+
+
+#endif // DEVICE_I2C_ASYNCH
+
+#endif // DEVICE_I2C