Hi,
I am reading and writing from and to a register of ADS1298 AFE through SPI communication. My Master is STM32F411CEU6. I am able to write to a register but not able to read from a register.
The register I am reading from is the ID Control Register (address: 00h). So the opcodes I am sending is
uint8_t opcode1 = 0x20; // For address
uint8_t opcode2 = 0x00; // register-1
Before sending the opcode I am making it as SDATAC. But still I am not reading the correct value (supposed to be 0x02 since I am using 1298). I am getting the value as 0x49.
Given Below is the complete code
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
uint8_t sdatac = 0x11; // Data to be transmitted
uint8_t opcode1 = 0x20; // Data to be transmitted
uint8_t opcode2 = 0x00; // Data to be transmitted
uint8_t rxData;
// SDATAC Configuration
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET); // CS low
HAL_Delay(10);
HAL_SPI_Transmit(&hspi1, &sdatac, 1, HAL_MAX_DELAY); // Transmit data
HAL_Delay(10);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET); // CS high
HAL_Delay(100);
/////////SDATAC Configuration completes//////////////
// Reading from 00H register
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET); // CS low
HAL_Delay(10);
HAL_SPI_Transmit(&hspi1, &opcode1, 1, HAL_MAX_DELAY); // Transmit data
HAL_Delay(4);
HAL_SPI_Transmit(&hspi1, &opcode2, 1, HAL_MAX_DELAY); // Transmit data
HAL_Delay(100);
HAL_SPI_Receive(&hspi1, &rxData, 1, HAL_MAX_DELAY); // Receive data
HAL_Delay(10);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET); // CS high
if(rxData == 0x02)
{
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_SET); // CS low
}
//////Ends here///////////
HAL_Delay(1000);
}
