static uint32_t iap_calc_crc(void)
{
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_CRC, ENABLE);
CRC_ResetDR();
CRC_CalcBlockCRC((uint32_t *) START_OF_USER_CODE, (SIZE_OF_CODE) >> 2);
return CRC_GetCRC();
}
uint32_t PIOS_BL_HELPER_CRC_Memory_Calc()
{
const struct pios_board_info * bdinfo = &pios_board_info_blob;
PIOS_BL_HELPER_CRC_Ini();
CRC_ResetDR();
CRC_CalcBlockCRC((uint32_t *) bdinfo->fw_base, (bdinfo->fw_size) >> 2);
return CRC_GetCRC();
}
void CRC_test(unsigned int calData)
{
unsigned int temp = 0;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_CRC, ENABLE);
CRC_ResetDR();
CRC_CalcCRC(calData);
temp = CRC_GetCRC();
//temp = temp; //why ,不加上这句话就看不到temp的真实值。
uart_printf("crc=0x%x\r\n",temp);
}
uint32_t crc_memory_calc()
{
CRC_ResetDR();
CRC_CalcBlockCRC((uint32_t *) START_OF_USER_CODE, (SIZE_OF_CODE) >> 2);
return CRC_GetCRC();
}
/**
* @brief This function handles USRAT interrupt request.
* @param None
* @retval None
*/
void USARTx_IRQHandler(void)
{
#ifdef MODE_TRANSMITTER
/* ------------------ USART in mode Tramitter ------------------------------*/
if (USART_GetITStatus(USARTx, USART_IT_TXE) == SET)
{
if (TxIndex < 0x48)
{
/* Send TxBuffer data */
USART_SendData(USARTx, TxBuffer[TxIndex]);
/* Compute 8-bit CRC */
CRC_CalcCRC8bits(TxBuffer[TxIndex++]);
} else if (TxIndex == 0x48)
{
/* Get computed computed value */
TxBuffer[TxIndex] = (uint8_t)CRC_GetCRC();
/* Reset CRC calculation unit */
CRC_ResetDR();
/* Send CRC computed value */
USART_SendData(USARTx, TxBuffer[TxIndex]);
/* Disable the USARTx transmit data register empty interrupt */
USART_ITConfig(USARTx, USART_IT_TXE, DISABLE);
/*Discard CRC sent value*/
TxBuffer[TxIndex] = 0;
/*reset TxBuffer index*/
TxIndex = 0;
}
}
#else
/* ------------------ USART in mode Receiver -------------------------------*/
if (USART_GetITStatus(USARTx, USART_IT_RXNE) == SET)
{
if (RxIndex < 0x48)
{
/* Receive the USART data */
RxBuffer[RxIndex] = USART_ReceiveData(USARTx);
/* compute 8-bit CRC */
CRC_CalcCRC8bits(RxBuffer[RxIndex++]);
}
else if (RxIndex == 0x48)
{
/* Get computed computed value */
ComputedCRC = (uint8_t)CRC_GetCRC();
/* Reset CRC calculation unit */
CRC_ResetDR();
/* Recive expected CRC value */
RxBuffer[RxIndex] = USART_ReceiveData(USARTx);
/* Compare computed CRC and recived CRC values*/
if (ComputedCRC == RxBuffer[RxIndex])
{
/* LED3 Off */
STM_EVAL_LEDOff(LED3);
/* Toggle LED2 */
STM_EVAL_LEDToggle(LED2);
} else {
/* LED3 On */
STM_EVAL_LEDOn(LED3);
/* LED2 Off */
STM_EVAL_LEDOff(LED2);
}
/* Reset RxBuffer index */
RxIndex = 0;
}
}
#endif /* MODE_TRANSMITTER */
}
/**
* @brief Computes the 32-bit CRC of a given data word(32-bit).
* @param Data: data word(32-bit) to compute its CRC
* @retval : 32-bit CRC
*/
uint32_t CRC_CalcCRC(uint32_t Data)
{
CRC->DR = Data;
CRC->DR = CRC_GetCRC();//gai
return (CRC->DR);
}
