void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
// 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->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
MBED_ASSERT(obj->i2c != (I2CName)NC);
// Enable I2C clock
if (obj->i2c == I2C_1) {
__I2C1_CLK_ENABLE();
}
if (obj->i2c == I2C_2) {
__I2C2_CLK_ENABLE();
}
if (obj->i2c == I2C_3) {
__I2C3_CLK_ENABLE();
}
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
// Reset to clear pending flags if any
i2c_reset(obj);
// I2C configuration
i2c_frequency(obj, 100000); // 100 kHz per default
}
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(hi2c->Instance==I2C3)
{
/* USER CODE BEGIN I2C3_MspInit 0 */
/* USER CODE END I2C3_MspInit 0 */
/**I2C3 GPIO Configuration
PH8 ------> I2C3_SDA
PH7 ------> I2C3_SCL
*/
GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C3;
HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
/* Peripheral clock enable */
__I2C3_CLK_ENABLE();
/* USER CODE BEGIN I2C3_MspInit 1 */
/* USER CODE END I2C3_MspInit 1 */
}
}
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(hi2c->Instance==I2C3)
{
/* Peripheral clock enable */
__I2C3_CLK_ENABLE();
/**I2C3 GPIO Configuration
PC9 ------> I2C3_SDA
PA8 ------> I2C3_SCL
*/
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C3;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C3;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
}
void i2c_init(i2c_t *obj, PinName sda, PinName scl)
{
static int i2c1_inited = 0;
static int i2c2_inited = 0;
#if defined(I2C3_BASE)
static int i2c3_inited = 0;
#endif
// 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->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
MBED_ASSERT(obj->i2c != (I2CName)NC);
// Enable I2C1 clock and pinout if not done
if ((obj->i2c == I2C_1) && !i2c1_inited) {
i2c1_inited = 1;
__HAL_RCC_I2C1_CONFIG(RCC_I2C1CLKSOURCE_SYSCLK);
__I2C1_CLK_ENABLE();
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
}
// Enable I2C2 clock and pinout if not done
if ((obj->i2c == I2C_2) && !i2c2_inited) {
i2c2_inited = 1;
__I2C2_CLK_ENABLE();
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
}
#if defined(I2C3_BASE)
// Enable I2C3 clock and pinout if not done
if ((obj->i2c == I2C_3) && !i2c3_inited) {
i2c3_inited = 1;
__I2C3_CLK_ENABLE();
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
}
#endif
// Reset to clear pending flags if any
i2c_reset(obj);
// I2C configuration
i2c_frequency(obj, 100000); // 100 kHz per default
}
void i2c_init(i2c_t *obj, PinName sda, PinName scl)
{
// 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->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
MBED_ASSERT(obj->i2c != (I2CName)NC);
// Enable I2C1 clock and pinout if not done
if ((obj->i2c == I2C_1) && !i2c1_inited) {
i2c1_inited = 1;
__I2C1_CLK_ENABLE();
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
}
// Enable I2C2 clock and pinout if not done
if ((obj->i2c == I2C_2) && !i2c2_inited) {
i2c2_inited = 1;
__I2C2_CLK_ENABLE();
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
}
// Enable I2C3 clock and pinout if not done
if ((obj->i2c == I2C_3) && !i2c3_inited) {
i2c3_inited = 1;
__I2C3_CLK_ENABLE();
// Configure I2C pins
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
pin_mode(sda, OpenDrain);
pin_mode(scl, OpenDrain);
}
// Reset to clear pending flags if any
i2c_reset(obj);
// I2C configuration
i2c_frequency(obj, 100000); // 100 kHz per default
// I2C master by default
obj->slave = 0;
}
void HAL_I2C_MspInit( I2C_HandleTypeDef *hi2c )
{
GPIO_InitTypeDef gio;
if( hi2c->Instance == I2C3 ) {
__I2C3_CLK_ENABLE();
__GPIOA_CLK_ENABLE();
__GPIOC_CLK_ENABLE();
// A8 --> I2C3_SCL
// C9 --> I2C3_SDA
gio.Pin = GPIO_PIN_8;
gio.Mode = GPIO_MODE_AF_OD;
gio.Pull = GPIO_NOPULL;
gio.Speed = GPIO_SPEED_MAX;
gio.Alternate = GPIO_AF4_I2C3;
HAL_GPIO_Init( GPIOA, &gio );
gio.Pin = GPIO_PIN_9;
HAL_GPIO_Init( GPIOC, &gio );
// tmp: not now
// HAL_NVIC_SetPriority( I2C3_EV_IRQn, 15, 0 ); // TODO: from FreeRTOS
// HAL_NVIC_EnableIRQ( I2C3_EV_IRQn );
}
}
void i2c_init(I2C_HandleTypeDef *i2c) {
int i2c_unit;
const pin_obj_t *scl_pin;
const pin_obj_t *sda_pin;
if (0) {
#if defined(MICROPY_HW_I2C1_SCL)
} else if (i2c == &I2CHandle1) {
i2c_unit = 1;
scl_pin = &MICROPY_HW_I2C1_SCL;
sda_pin = &MICROPY_HW_I2C1_SDA;
__I2C1_CLK_ENABLE();
#endif
#if defined(MICROPY_HW_I2C2_SCL)
} else if (i2c == &I2CHandle2) {
i2c_unit = 2;
scl_pin = &MICROPY_HW_I2C2_SCL;
sda_pin = &MICROPY_HW_I2C2_SDA;
__I2C2_CLK_ENABLE();
#endif
#if defined(MICROPY_HW_I2C3_SCL)
} else if (i2c == &I2CHandle3) {
i2c_unit = 3;
scl_pin = &MICROPY_HW_I2C3_SCL;
sda_pin = &MICROPY_HW_I2C3_SDA;
__I2C3_CLK_ENABLE();
#endif
#if defined(MICROPY_HW_I2C4_SCL)
} else if (i2c == &I2CHandle4) {
i2c_unit = 4;
scl_pin = &MICROPY_HW_I2C4_SCL;
sda_pin = &MICROPY_HW_I2C4_SDA;
__I2C3_CLK_ENABLE();
#endif
} else {
// I2C does not exist for this board (shouldn't get here, should be checked by caller)
return;
}
// init the GPIO lines
uint32_t mode = MP_HAL_PIN_MODE_ALT_OPEN_DRAIN;
uint32_t pull = MP_HAL_PIN_PULL_NONE; // have external pull-up resistors on both lines
mp_hal_pin_config_alt(scl_pin, mode, pull, AF_FN_I2C, i2c_unit);
mp_hal_pin_config_alt(sda_pin, mode, pull, AF_FN_I2C, i2c_unit);
// init the I2C device
if (HAL_I2C_Init(i2c) != HAL_OK) {
// init error
// TODO should raise an exception, but this function is not necessarily going to be
// called via Python, so may not be properly wrapped in an NLR handler
printf("OSError: HAL_I2C_Init failed\n");
return;
}
// invalidate the DMA channels so they are initialised on first use
const pyb_i2c_obj_t *self = &pyb_i2c_obj[i2c_unit - 1];
dma_invalidate_channel(self->tx_dma_descr);
dma_invalidate_channel(self->rx_dma_descr);
if (0) {
#if defined(MICROPY_HW_I2C1_SCL)
} else if (i2c->Instance == I2C1) {
HAL_NVIC_EnableIRQ(I2C1_EV_IRQn);
HAL_NVIC_EnableIRQ(I2C1_ER_IRQn);
#endif
#if defined(MICROPY_HW_I2C2_SCL)
} else if (i2c->Instance == I2C2) {
HAL_NVIC_EnableIRQ(I2C2_EV_IRQn);
HAL_NVIC_EnableIRQ(I2C2_ER_IRQn);
#endif
#if defined(MICROPY_HW_I2C3_SCL)
} else if (i2c->Instance == I2C3) {
HAL_NVIC_EnableIRQ(I2C3_EV_IRQn);
HAL_NVIC_EnableIRQ(I2C3_ER_IRQn);
#endif
#if defined(MICROPY_HW_I2C4_SCL)
} else if (i2c->Instance == I2C4) {
HAL_NVIC_EnableIRQ(I2C4_EV_IRQn);
HAL_NVIC_EnableIRQ(I2C4_ER_IRQn);
#endif
}
}
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(hi2c->Instance==I2C1)
{
/* USER CODE BEGIN I2C1_MspInit 0 */
/* USER CODE END I2C1_MspInit 0 */
/**I2C1 GPIO Configuration
PB8 ------> I2C1_SCL
PB9 ------> I2C1_SDA
*/
GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* Peripheral clock enable */
__I2C1_CLK_ENABLE();
/* Peripheral DMA init*/
hdma_i2c1_rx.Instance = DMA1_Stream5;
hdma_i2c1_rx.Init.Channel = DMA_CHANNEL_1;
hdma_i2c1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_i2c1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_i2c1_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_i2c1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_i2c1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_i2c1_rx.Init.Mode = DMA_NORMAL;
hdma_i2c1_rx.Init.Priority = DMA_PRIORITY_VERY_HIGH;
hdma_i2c1_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_i2c1_rx);
__HAL_LINKDMA(hi2c,hdmarx,hdma_i2c1_rx);
hdma_i2c1_tx.Instance = DMA1_Stream6;
hdma_i2c1_tx.Init.Channel = DMA_CHANNEL_1;
hdma_i2c1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_i2c1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_i2c1_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_i2c1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_i2c1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_i2c1_tx.Init.Mode = DMA_NORMAL;
hdma_i2c1_tx.Init.Priority = DMA_PRIORITY_LOW;
hdma_i2c1_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_i2c1_tx);
__HAL_LINKDMA(hi2c,hdmatx,hdma_i2c1_tx);
/* USER CODE BEGIN I2C1_MspInit 1 */
/* USER CODE END I2C1_MspInit 1 */
}
else if(hi2c->Instance==I2C3)
{
/* USER CODE BEGIN I2C3_MspInit 0 */
/* USER CODE END I2C3_MspInit 0 */
/**I2C3 GPIO Configuration
PC9 ------> I2C3_SDA
PA8 ------> I2C3_SCL
*/
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C3;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C3;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* Peripheral clock enable */
__I2C3_CLK_ENABLE();
/* Peripheral DMA init*/
hdma_i2c3_tx.Instance = DMA1_Stream4;
hdma_i2c3_tx.Init.Channel = DMA_CHANNEL_3;
hdma_i2c3_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_i2c3_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_i2c3_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_i2c3_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_i2c3_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_i2c3_tx.Init.Mode = DMA_NORMAL;
hdma_i2c3_tx.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_i2c3_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_i2c3_tx);
__HAL_LINKDMA(hi2c,hdmatx,hdma_i2c3_tx);
hdma_i2c3_rx.Instance = DMA1_Stream2;
hdma_i2c3_rx.Init.Channel = DMA_CHANNEL_3;
hdma_i2c3_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_i2c3_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_i2c3_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_i2c3_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_i2c3_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_i2c3_rx.Init.Mode = DMA_NORMAL;
hdma_i2c3_rx.Init.Priority = DMA_PRIORITY_MEDIUM;
hdma_i2c3_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_i2c3_rx);
__HAL_LINKDMA(hi2c,hdmarx,hdma_i2c3_rx);
/* USER CODE BEGIN I2C3_MspInit 1 */
/* USER CODE END I2C3_MspInit 1 */
}
}