mbed_example / Mbed OS CRC_eample_sd

CRC example for SD driver

main.cpp@3:97e3e51ca5d5, 2018-10-24 (annotated)

Committer:
Maciej Bocianski
Date:
Wed Oct 24 11:58:37 2018 +0200
Revision:
3:97e3e51ca5d5
Parent:
2:ee110889fa99 
fix compilation warnings

Who changed what in which revision?

UserRevisionLine numberNew contents of line
deepikabhavnani 0:e60fda833675 1 #include "mbed.h"
deepikabhavnani 0:e60fda833675 2
deepikabhavnani 2:ee110889fa99 3 int crc_sd_7bit()
deepikabhavnani 2:ee110889fa99 4 {
deepikabhavnani 2:ee110889fa99 5 MbedCRC<POLY_7BIT_SD, 7> ct;
deepikabhavnani 1:ca0b1e353dfe 6 char test[5];
deepikabhavnani 1:ca0b1e353dfe 7 uint32_t crc;
deepikabhavnani 1:ca0b1e353dfe 8
deepikabhavnani 0:e60fda833675 9 test[0] = 0x40;
deepikabhavnani 0:e60fda833675 10 test[1] = 0x00;
deepikabhavnani 0:e60fda833675 11 test[2] = 0x00;
deepikabhavnani 0:e60fda833675 12 test[3] = 0x00;
deepikabhavnani 0:e60fda833675 13 test[4] = 0x00;
deepikabhavnani 1:ca0b1e353dfe 14
deepikabhavnani 1:ca0b1e353dfe 15 ct.compute((void *)test, 5, &crc);
deepikabhavnani 0:e60fda833675 16 // CRC 7-bit as 8-bit data
deepikabhavnani 2:ee110889fa99 17 crc = (crc | 0x01) & 0xFF;
Maciej Bocianski 3:97e3e51ca5d5 18 printf("The CRC of 0x%lx \"CMD0\" is \"0x95\" Result: 0x%lx\n",
deepikabhavnani 2:ee110889fa99 19 ct.get_polynomial(), crc);
deepikabhavnani 0:e60fda833675 20
deepikabhavnani 0:e60fda833675 21 test[0] = 0x48;
deepikabhavnani 0:e60fda833675 22 test[1] = 0x00;
deepikabhavnani 0:e60fda833675 23 test[2] = 0x00;
deepikabhavnani 0:e60fda833675 24 test[3] = 0x01;
deepikabhavnani 0:e60fda833675 25 test[4] = 0xAA;
deepikabhavnani 1:ca0b1e353dfe 26
deepikabhavnani 1:ca0b1e353dfe 27 ct.compute((void *)test, 5, &crc);
deepikabhavnani 0:e60fda833675 28 // CRC 7-bit as 8-bit data
deepikabhavnani 2:ee110889fa99 29 crc = (crc | 0x01) & 0xFF;
Maciej Bocianski 3:97e3e51ca5d5 30 printf("The CRC of 0x%lx \"CMD8\" is \"0x87\" Result: 0x%lx\n",
deepikabhavnani 2:ee110889fa99 31 ct.get_polynomial(), crc);
deepikabhavnani 0:e60fda833675 32
deepikabhavnani 0:e60fda833675 33 test[0] = 0x51;
deepikabhavnani 0:e60fda833675 34 test[1] = 0x00;
deepikabhavnani 0:e60fda833675 35 test[2] = 0x00;
deepikabhavnani 0:e60fda833675 36 test[3] = 0x00;
deepikabhavnani 0:e60fda833675 37 test[4] = 0x00;
deepikabhavnani 0:e60fda833675 38
deepikabhavnani 1:ca0b1e353dfe 39 ct.compute((void *)test, 5, &crc);
deepikabhavnani 0:e60fda833675 40 // CRC 7-bit as 8-bit data
deepikabhavnani 2:ee110889fa99 41 crc = (crc | 0x01) & 0xFF;
Maciej Bocianski 3:97e3e51ca5d5 42 printf("The CRC of 0x%lx \"CMD17\" is \"0x55\" Result: 0x%lx\n",
deepikabhavnani 2:ee110889fa99 43 ct.get_polynomial(), crc);
deepikabhavnani 0:e60fda833675 44
deepikabhavnani 0:e60fda833675 45 return 0;
deepikabhavnani 0:e60fda833675 46 }
deepikabhavnani 0:e60fda833675 47
deepikabhavnani 2:ee110889fa99 48 int crc_sd_16bit()
deepikabhavnani 2:ee110889fa99 49 {
deepikabhavnani 0:e60fda833675 50 char test[512];
deepikabhavnani 0:e60fda833675 51 uint32_t crc;
deepikabhavnani 2:ee110889fa99 52 MbedCRC<POLY_16BIT_CCITT, 16> sd(0, 0, false, false);
deepikabhavnani 1:ca0b1e353dfe 53
deepikabhavnani 0:e60fda833675 54 memset(test, 0xFF, 512);
deepikabhavnani 0:e60fda833675 55 // 512 bytes with 0xFF data --> CRC16 = 0x7FA1
deepikabhavnani 0:e60fda833675 56 sd.compute((void *)test, 512, &crc);
Maciej Bocianski 3:97e3e51ca5d5 57 printf("16BIT SD CRC (512 bytes 0xFF) is \"0x7FA1\" Result: 0x%lx\n", crc);
deepikabhavnani 0:e60fda833675 58 return 0;
deepikabhavnani 0:e60fda833675 59 }
deepikabhavnani 0:e60fda833675 60
deepikabhavnani 1:ca0b1e353dfe 61 int main()
deepikabhavnani 0:e60fda833675 62 {
deepikabhavnani 1:ca0b1e353dfe 63 crc_sd_16bit();
deepikabhavnani 0:e60fda833675 64 crc_sd_7bit();
deepikabhavnani 0:e60fda833675 65 return 0;
deepikabhavnani 0:e60fda833675 66 }