Question
Calculate 16-bit CRC using STM32F0 Peripheral
Posted on December 12, 2016 at 08:26
Hello All,
I want to implement MODBUS RTU Slave for my Discovery STM32F0. I have worked on this protocol in 8051 controller. As i was going through CUBE i saw CRC peripheral in STM32F0 so i was curious and want to implement it on hardware side. I have implemented as below
/*##-1- Configure the CRC peripheral #######################################*/
CrcHandle.Instance = CRC;
/* The default polynomial is used */
CrcHandle.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;
/* The default init value is used */
CrcHandle.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_ENABLE;
/* The input data are not inverted */
CrcHandle.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;
/* The output data are not inverted */
CrcHandle.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;
/* The input data are 8 bits lenght */
CrcHandle.InputDataFormat = CRC_INPUTDATA_FORMAT_BYTES;
if (HAL_CRC_Init(&CrcHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
/* Initialize interrupts */
MX_NVIC_Init();
HAL_GPIO_WritePin(ADC_DATA_Rdy_GPIO_Port , ADC_DATA_Rdy_Pin, GPIO_PIN_SET);
HAL_GPIO_WritePin(ADC_Clk_GPIO_Port , ADC_Clk_Pin, GPIO_PIN_RESET);
tx_buf[0] = 0x01;
tx_buf[1] = 0x03;
tx_buf[2] = 0x00;
tx_buf[3] = 0x00;
tx_buf[4] = 0x00;
tx_buf[5] = 0x02;
uwCRCValue = HAL_CRC_Accumulate(&CrcHandle,(uint32_t *) tx_buf, 6);�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?But i am receiving wrong value for crc. My input is bytes of len 6 . Kindly help me if possible.
#crc-16