/**
* @brief Configure CRC peripheral to use 8-bit polynomials
* @param poly: the CRC polynomial
* @retval None
*/
static void CRC_Config(uint8_t poly)
{
/* Enable CRC AHB clock interface */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_CRC, ENABLE);
/* DeInit CRC peripheral */
CRC_DeInit();
/* Init the INIT register */
CRC_SetInitRegister(0);
/* Select 8-bit polynomial size */
CRC_PolynomialSizeSelect(CRC_PolSize_8);
/* Set the polynomial coefficients */
CRC_SetPolynomial(poly);
}
int main(void) {
// Initialize the MCU clock system
SystemInit();
SetSysClock();
SystemCoreClockUpdate();
// Initialize debug output port (USART2)
// clock source: SYSCLK
// mode: transmit only
USART2_HandleInit();
RCC_SetClockUSART(RCC_USART2_CLK_SRC,RCC_PERIPH_CLK_SYSCLK);
USART_Init(&hUSART2,USART_MODE_TX);
// Configure USART:
// oversampling by 16
// 115200, 8-N-1
// no hardware flow control
USART_SetOversampling(&hUSART2,USART_OVERS16);
USART_SetBaudRate(&hUSART2,115200);
USART_SetDataMode(&hUSART2,USART_DATAWIDTH_8B,USART_PARITY_NONE,USART_STOPBITS_1);
USART_SetHWFlow(&hUSART2,USART_HWCTL_NONE);
USART_Enable(&hUSART2);
USART_CheckIdleState(&hUSART2,0xC5C10); // Timeout of about 100ms at 80MHz CPU
// Say "hello world"
RCC_ClocksTypeDef Clocks;
RCC_GetClocksFreq(&Clocks);
printf("\r\n---STM32L476RG---\r\n");
printf("CRC peripheral (%s @ %s)\r\n",__DATE__,__TIME__);
printf("CPU: %.3uMHz\r\n",SystemCoreClock / 1000);
printf("SYSCLK=%.3uMHz, HCLK=%.3uMHz\r\n",Clocks.SYSCLK_Frequency / 1000,Clocks.HCLK_Frequency / 1000);
printf("APB1=%.3uMHz, APB2=%.3uMHz\r\n",Clocks.PCLK1_Frequency / 1000,Clocks.PCLK2_Frequency / 1000);
printf("System clock: %s\r\n",_sysclk_src_str[RCC_GetSysClockSource()]);
// Enable the CRC peripheral
CRC_Enable();
// Disable reverse for input and output data
CRC_SetInRevMode(CRC_IN_NORMAL);
CRC_SetOutRevMode(CRC_OUT_NORMAL);
// First column in output is the calculated CRC, second - reference value
// 8-bit CRC tests
CRC_SetPolynomialSize(CRC_PSIZE_8B);
printf("CRC-8 tests:\r\n");
// CCITT CRC-8 (Poly=0x07, Init=0x00, RefIn=false, RefOut=false)
CRC_SetPolynomial(0x07);
CRC_SetInitValue(0x00);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("CCITT : 0x%02X . 0x%02X\r\n", CRC_GetData8(), 0x34);
// CDMA2000 CRC-8 (Poly=0x9B, Init=0xFF, RefIn=false, RefOut=false)
CRC_SetPolynomial(0x9B);
CRC_SetInitValue(0xFF);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("CDMA2000 : 0x%02X . 0x%02X\r\n", CRC_GetData8(), 0xCE);
// WCDMA CRC-8 (Poly=0x9B, Init=0x00, RefIn=true, RefOut=true)
CRC_SetInitValue(0x00);
CRC_SetInRevMode(CRC_IN_REV_BYTE);
CRC_SetOutRevMode(CRC_OUT_REVERSED);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("WCDMA : 0x%02X . 0x%02X\r\n", CRC_GetData8(), 0xEA);
// I-CODE CRC-8 (Poly=0x1D, Init=0xFD, RefIn=false, RefOut=false)
CRC_SetPolynomial(0x1D);
CRC_SetInitValue(0xFD);
CRC_SetInRevMode(CRC_IN_NORMAL);
CRC_SetOutRevMode(CRC_OUT_NORMAL);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("I-CODE : 0x%02X . 0x%02X\r\n", CRC_GetData8(), 0x87);
// ROHC CRC-8 (Poly=0x07, Init=0xFF, RefIn=true, RefOut=true)
CRC_SetPolynomial(0x07);
CRC_SetInitValue(0xFF);
CRC_SetInRevMode(CRC_IN_REV_BYTE);
CRC_SetOutRevMode(CRC_OUT_REVERSED);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("ROHC : 0x%02X . 0x%02X\r\n", CRC_GetData8(), 0x1A);
// 16-bit CRC tests
CRC_SetPolynomialSize(CRC_PSIZE_16B);
printf("CRC-16 tests:\r\n");
// MODBUS (Poly=0x8005, Init=0xFFFF, RefIn=true, RefOut=true)
CRC_SetPolynomial(0x8005);
CRC_SetInitValue(0xFFFF);
CRC_SetInRevMode(CRC_IN_REV_BYTE);
CRC_SetOutRevMode(CRC_OUT_REVERSED);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("MODBUS : 0x%04X . 0x%04X\r\n", CRC_GetData16(), 0x3BD1);
// CDMA2000 (Poly=0xC867, Init=0xFFFF, RefIn=false, RefOut=false)
CRC_SetPolynomial(0xC867);
CRC_SetInRevMode(CRC_IN_NORMAL);
CRC_SetOutRevMode(CRC_OUT_NORMAL);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("CDMA2000 : 0x%04X . 0x%04X\r\n", CRC_GetData16(), 0x52F7);
// XMODEM (Poly=0x1021, Init=0x0000, RefIn=false, RefOut=false)
CRC_SetPolynomial(0x1021);
CRC_SetInitValue(0x0000);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("XMODEM : 0x%04X . 0x%04X\r\n", CRC_GetData16(), 0x047B);
// USB (Poly=0x8005, Init=0xFFFF, RefIn=true, RefOut=true, XorOut=0xFFFF)
CRC_SetPolynomial(0x8005);
CRC_SetInitValue(0xFFFF);
CRC_SetInRevMode(CRC_IN_REV_BYTE);
CRC_SetOutRevMode(CRC_OUT_REVERSED);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("USB : 0x%04X . 0x%04X\r\n", CRC_GetData16() ^ 0xFFFF, 0xC42E);
// 32-bit CRC tests
CRC_SetPolynomialSize(CRC_PSIZE_32B);
printf("CRC-32 tests:\r\n");
// MPEG-2 (Poly=0x04C11DB7, Init=0xFFFFFFFF, RefIn=true, RefOut=true)
CRC_SetPolynomial(0x04C11DB7);
CRC_SetInitValue(0xFFFFFFFF);
CRC_SetInRevMode(CRC_IN_NORMAL);
CRC_SetOutRevMode(CRC_OUT_NORMAL);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("MPEG-2 : 0x%08X . 0x%08X\r\n", CRC_GetData32(), 0xF5C62CB4);
// POSIX (Poly=0x04C11DB7, Init=0x00000000, RefIn=false, RefOut=false, XorOut=0xFFFFFFFF)
CRC_SetPolynomial(0x04C11DB7);
CRC_SetInitValue(0x00000000);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("POSIX : 0x%08X . 0x%08X\r\n", CRC_GetData32() ^ 0xFFFFFFFF, 0xD338A790);
// CRC-32D (Poly=0xA833982B, Init=0xFFFFFFFF, RefIn=true, RefOut=true, XorOut=0xFFFFFFFF)
CRC_SetPolynomial(0xA833982B);
CRC_SetInitValue(0xFFFFFFFF);
CRC_SetInRevMode(CRC_IN_REV_BYTE);
CRC_SetOutRevMode(CRC_OUT_REVERSED);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("CRC-32D : 0x%08X . 0x%08X\r\n", CRC_GetData32() ^ 0xFFFFFFFF, 0xD2178F40);
// XFER (Poly=0x000000AF, Init=0x00000000, RefIn=false, RefOut=false)
CRC_SetPolynomial(0x000000AF);
CRC_SetInitValue(0x00000000);
CRC_SetInRevMode(CRC_IN_NORMAL);
CRC_SetOutRevMode(CRC_OUT_NORMAL);
CRC_Reset();
CRC_CalcBuffer((uint32_t *)data_buf, buf_size);
printf("XFER : 0x%08X . 0x%08X\r\n", CRC_GetData32(), 0x5D4143CF);
// The main loop
while (1) {
}
}
