Hi,
I recently need to use I2C with interrupt mode to lower my CPU usage.
So I did this changes :
I changed the function where I call my transmit
static HAL_StatusTypeDef PGA309_Write_RawData(uint8_t REGISTER,uint8_t LSB_DATA,uint8_t MSB_DATA)
{
uint16_t i = 0;
I2C1_TxBuffer[i++]= REGISTER; //First data : Set register address
I2C1_TxBuffer[i++]= LSB_DATA; //Second data : LSB value
I2C1_TxBuffer[i++]= MSB_DATA; //Third data : MSB value
//return HAL_I2C_Master_Transmit(&hi2c4, (uint16_t)PGA309_SLAVE_ID, I2C1_TxBuffer, i, (uint32_t)100);
return HAL_I2C_Master_Transmit_IT(&hi2c4, (uint16_t)PGA309_SLAVE_ID, I2C1_TxBuffer, i);
}
I added NVIC stuff to HAL_I2C_MspInit()
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(hi2c->Instance==I2C4)
{
/* USER CODE BEGIN I2C4_MspInit 0 */
/* USER CODE END I2C4_MspInit 0 */
__HAL_RCC_GPIOF_CLK_ENABLE();
/**I2C4 GPIO Configuration
PF14 ------> I2C4_SCL
PF15 ------> I2C4_SDA
*/
GPIO_InitStruct.Pin = GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C4;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
/* Peripheral clock enable */
__HAL_RCC_I2C4_CLK_ENABLE();
/* USER CODE BEGIN I2C4_MspInit 1 */
HAL_NVIC_SetPriority(I2C4_ER_IRQn, 2, 2);
HAL_NVIC_EnableIRQ(I2C4_ER_IRQn);
HAL_NVIC_SetPriority(I2C4_EV_IRQn, 2, 2);
HAL_NVIC_EnableIRQ(I2C4_EV_IRQn);
/* USER CODE END I2C4_MspInit 1 */
}
}
But shortly after I call Transmit_IT my CPU ends up stuck here :
/**
* @brief This is the code that gets called when the processor receives an
* unexpected interrupt. This simply enters an infinite loop, preserving
* the system state for examination by a debugger.
* @param None
* @retval None
*/
.section .text.Default_Handler,"ax",%progbits
Default_Handler:
Infinite_Loop:
b Infinite_Loop
.size Default_Handler, .-Default_Handler
It looks like my I2C peripheral is sending an unexpected interrupt, am I missing some init parameters ?
