Hello....
I am trying to communicate with the above subject but I am not sure what CPOL and CPHA should be set to. STM uses MODE1 - 4 but SPI talks about MODE 0 - 1. I have the following basic code to just try and read the WHO_AM_I Register (0x15) which should return 0x6A. I am using an ST sensortile which is too small to get a logic analyzer on it to see what is going on. My code is pretty basic....I have tried all the variants of CPOL and CPHA and only get 0 or 255 back. Can someone please tell me what I am doing wrong? (using an STM32L476JG)
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi2, (uint8_t *)&WHO_AM_I, 1, 100);
HAL_SPI_Receive(&hspi2, (uint8_t *)&spiValue, 1, 100);
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET);
HAL_Delay(1000);
