mbed_example / Mbed OS CRC_eample_sd

CRC example for SD driver

main.cpp@0:e60fda833675, 2017-12-18 (annotated)

Committer:
deepikabhavnani
Date:
Mon Dec 18 22:58:44 2017 +0000
Revision:
0:e60fda833675
Child:
1:ca0b1e353dfe
CRC example

Who changed what in which revision?

UserRevisionLine numberNew contents of line
deepikabhavnani 0:e60fda833675 1 #include "mbed.h"
deepikabhavnani 0:e60fda833675 2 #include "mbed_crc.h"
deepikabhavnani 0:e60fda833675 3 #include "SlowCRC.h"
deepikabhavnani 0:e60fda833675 4 #include "FastCRC.h"
deepikabhavnani 0:e60fda833675 5
deepikabhavnani 0:e60fda833675 6 int crc_sd_7bit() {
deepikabhavnani 0:e60fda833675 7 SlowCRC<uint8_t> ct(CRC_7BIT_SD);
deepikabhavnani 0:e60fda833675 8
deepikabhavnani 0:e60fda833675 9 ct.init();
deepikabhavnani 0:e60fda833675 10 test[0] = 0x40;
deepikabhavnani 0:e60fda833675 11 test[1] = 0x00;
deepikabhavnani 0:e60fda833675 12 test[2] = 0x00;
deepikabhavnani 0:e60fda833675 13 test[3] = 0x00;
deepikabhavnani 0:e60fda833675 14 test[4] = 0x00;
deepikabhavnani 0:e60fda833675 15
deepikabhavnani 0:e60fda833675 16 ct.compute((void *)test, 5, &crc);
deepikabhavnani 0:e60fda833675 17 // CRC 7-bit as 8-bit data
deepikabhavnani 0:e60fda833675 18 crc = (crc << 1 ) + 1;
deepikabhavnani 0:e60fda833675 19 printf("The CRC of 0x%x \"CMD0\" is \"0x95\" Result: 0x%x\n",
deepikabhavnani 0:e60fda833675 20 ct.get_polynomial(), crc);
deepikabhavnani 0:e60fda833675 21
deepikabhavnani 0:e60fda833675 22 test[0] = 0x48;
deepikabhavnani 0:e60fda833675 23 test[1] = 0x00;
deepikabhavnani 0:e60fda833675 24 test[2] = 0x00;
deepikabhavnani 0:e60fda833675 25 test[3] = 0x01;
deepikabhavnani 0:e60fda833675 26 test[4] = 0xAA;
deepikabhavnani 0:e60fda833675 27
deepikabhavnani 0:e60fda833675 28 ct.compute((void *)test, 5, &crc);
deepikabhavnani 0:e60fda833675 29 // CRC 7-bit as 8-bit data
deepikabhavnani 0:e60fda833675 30 crc = (crc << 1 ) + 1;
deepikabhavnani 0:e60fda833675 31 printf("The CRC of 0x%x \"CMD8\" is \"0x87\" Result: 0x%x\n",
deepikabhavnani 0:e60fda833675 32 ct.get_polynomial(), crc);
deepikabhavnani 0:e60fda833675 33
deepikabhavnani 0:e60fda833675 34 test[0] = 0x51;
deepikabhavnani 0:e60fda833675 35 test[1] = 0x00;
deepikabhavnani 0:e60fda833675 36 test[2] = 0x00;
deepikabhavnani 0:e60fda833675 37 test[3] = 0x00;
deepikabhavnani 0:e60fda833675 38 test[4] = 0x00;
deepikabhavnani 0:e60fda833675 39
deepikabhavnani 0:e60fda833675 40 ct.compute((void *)test, 5, &crc);
deepikabhavnani 0:e60fda833675 41 // CRC 7-bit as 8-bit data
deepikabhavnani 0:e60fda833675 42 crc = (crc << 1 ) + 1;
deepikabhavnani 0:e60fda833675 43 printf("The CRC of 0x%x \"CMD17\" is \"0x55\" Result: 0x%x\n",
deepikabhavnani 0:e60fda833675 44 ct.get_polynomial(), crc);
deepikabhavnani 0:e60fda833675 45
deepikabhavnani 0:e60fda833675 46 ct.deinit();
deepikabhavnani 0:e60fda833675 47 return 0;
deepikabhavnani 0:e60fda833675 48 }
deepikabhavnani 0:e60fda833675 49
deepikabhavnani 0:e60fda833675 50 int crc_sd_16bit() {
deepikabhavnani 0:e60fda833675 51 char test[512];
deepikabhavnani 0:e60fda833675 52 uint32_t crc;
deepikabhavnani 0:e60fda833675 53 FastCRC<uint16_t> sd(CRC_16BIT_SD);
deepikabhavnani 0:e60fda833675 54
deepikabhavnani 0:e60fda833675 55 memset(test, 0xFF, 512);
deepikabhavnani 0:e60fda833675 56 // 512 bytes with 0xFF data --> CRC16 = 0x7FA1
deepikabhavnani 0:e60fda833675 57 sd.init();
deepikabhavnani 0:e60fda833675 58 sd.compute((void *)test, 512, &crc);
deepikabhavnani 0:e60fda833675 59 printf("The 16BIT SD CRC of 512 bytes with 0xFF data is \"0x7FA1\" Result: 0x%x\n", crc);
deepikabhavnani 0:e60fda833675 60 sd.deinit();
deepikabhavnani 0:e60fda833675 61 return 0;
deepikabhavnani 0:e60fda833675 62 }
deepikabhavnani 0:e60fda833675 63
deepikabhavnani 0:e60fda833675 64 int main()
deepikabhavnani 0:e60fda833675 65 {
deepikabhavnani 0:e60fda833675 66 crc_sd_16bit();
deepikabhavnani 0:e60fda833675 67 crc_sd_7bit();
deepikabhavnani 0:e60fda833675 68 return 0;
deepikabhavnani 0:e60fda833675 69 }