Question
I2C errors and interrupts
Hi there,
I'm using the STM32H7 to talk to a CS2000 clock chip over I2C. I'm using interrupt mode.
I'm just trying to read the chip's ID register for starters. Despite the CS2000 ACKing the first 'setup write' byte, it won't write the second byte (with the register address). The peripheral also just reports as busy from that point onwards, and neither the error or event interrupts are triggered.
I used CubeMX to set it up, but here's my code:
I2C Init:
static void MX_I2C1_Init(void)
{
/* USER CODE BEGIN I2C1_Init 0 */
/* USER CODE END I2C1_Init 0 */
/* USER CODE BEGIN I2C1_Init 1 */
/* USER CODE END I2C1_Init 1 */
hi2c1.Instance = I2C1;
hi2c1.Init.Timing = 0x306062D1;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
/** Configure Analogue filter
*/
if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
{
Error_Handler();
}
/** Configure Digital filter
*/
if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN I2C1_Init 2 */
/* USER CODE END I2C1_Init 2 */
}Interrupts:
void I2C1_EV_IRQHandler(void)
{
/* USER CODE BEGIN I2C1_EV_IRQn 0 */
/* USER CODE END I2C1_EV_IRQn 0 */
HAL_I2C_EV_IRQHandler(&hi2c1);
/* USER CODE BEGIN I2C1_EV_IRQn 1 */
/* USER CODE END I2C1_EV_IRQn 1 */
}
/**
* @brief This function handles I2C1 error interrupt.
*/
void I2C1_ER_IRQHandler(void)
{
/* USER CODE BEGIN I2C1_ER_IRQn 0 */
/* USER CODE END I2C1_ER_IRQn 0 */
HAL_I2C_ER_IRQHandler(&hi2c1);
/* USER CODE BEGIN I2C1_ER_IRQn 1 */
/* USER CODE END I2C1_ER_IRQn 1 */
}Trying to read the ID:
uint8_t tx_buff[3] = {CS2000_REG_ID, 0, 0};
uint8_t rx_buff[3] = {0, 0, 0};
/* Check the device ID */
if(HAL_I2C_Master_Transmit_IT(&hi2c1, CS2000_I2C_ADDRESS, (uint8_t*)tx_buff, 1)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Wait for data to be sent */
while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY);
if(HAL_I2C_Master_Receive_IT(&hi2c1, CS2000_I2C_ADDRESS, (uint8_t *)rx_buff, 1) != HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Wait until data has been received */
while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY)
{
}In the errata it mentions spurious errors, but that would generate an interrupt, which I'm not seeing. The state of the peripheral is always 'BUSY_TX'
Any ideas?
Cheers!
