/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
const uint8_t acCRCSrcPattern[] = {0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38};
uint32_t i, u32TargetChecksum = 0xA12B, u32CalChecksum = 0;
uint16_t *p16SrcAddr;
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
printf("+---------------------------------------------+\n");
printf("| CRC-CCITT Polynomial Mode Sample Code |\n");
printf("+---------------------------------------------+\n\n");
printf("# Calculate [0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38] CRC-CCITT checksum value.\n");
printf(" - Seed value is 0xFFFF \n");
printf(" - CPU write data length is 16-bit \n");
printf(" - Checksum complement disable \n");
printf(" - Checksum reverse disable \n");
printf(" - Write data complement disable \n");
printf(" - Write data reverse disable \n");
printf(" - Checksum should be 0x%X \n\n", u32TargetChecksum);
/* Configure CRC controller for CRC-CCITT CPU mode */
CRC_Open(CRC_CCITT, 0, 0xFFFF, CRC_CPU_WDATA_16);
/* Convert 16-bit source data */
p16SrcAddr = (uint16_t *)acCRCSrcPattern;
/* Start to execute CRC-CCITT operation */
for(i = 0; i < sizeof(acCRCSrcPattern) / 2; i++)
{
CRC_WRITE_DATA((p16SrcAddr[i] & 0xFFFF));
}
/* Get CRC-CCITT checksum value */
u32CalChecksum = CRC_GetChecksum();
printf("CRC checksum is 0x%X ... %s.\n", u32CalChecksum, (u32CalChecksum == u32TargetChecksum) ? "PASS" : "FAIL");
/* Disable CRC function */
CLK_DisableModuleClock(CRC_MODULE);
while(1);
}
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
const uint8_t acCRCSrcPattern[] = "123456789";
uint32_t i, u32TargetChecksum = 0x58, u32CalChecksum = 0;
uint8_t *p8SrcAddr;
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("\n\nCPU @ %dHz\n", SystemCoreClock);
printf("+---------------------------------+\n");
printf("| CRC CRC-8 Mode Sample Code |\n");
printf("+---------------------------------+\n\n");
printf("# Calculate string \"123456789\" CRC-8 checksum value by CRC CPU mode.\n");
printf(" - Seed value is 0x5A \n");
printf(" - CPU Write Length is 8-bit \n");
printf(" - Checksum Complement disable \n");
printf(" - Checksum Reverse disable \n");
printf(" - Write Data Complement disable \n");
printf(" - Write Data Reverse disable \n");
printf(" - Checksum should be 0x%X \n\n", u32TargetChecksum);
/* Set CRC source buffer address for CRC-8 CPU mode */
p8SrcAddr = (uint8_t *)acCRCSrcPattern;
/* Configure CRC operation settings for CRC-8 CPU mode */
CRC_Open(CRC_8, 0, 0x5A, CRC_CPU_WDATA_8);
/* Start to execute CRC-8 CPU operation */
for(i = 0; i < strlen((char *)acCRCSrcPattern); i++) {
CRC_WRITE_DATA((p8SrcAddr[i] & 0xFF));
}
/* Get CRC-8 checksum value */
u32CalChecksum = CRC_GetChecksum();
printf("CRC checksum is 0x%X ... %s.\n", u32CalChecksum, (u32CalChecksum == u32TargetChecksum) ? "PASS" : "FAIL");
/* Disable CRC function */
CRC->CTL &= ~CRC_CTL_CRCCEN_Msk;
while(1);
}
