University of Plymouth - Stages 1, 2 and 3 / Mbed OS ELEC350-SD_Card_Demo

SD Card Demo

Dependencies:   ELEC350-Practicals-FZ429

Fork of SD_Card_OS by Plymouth University UK SoCEM Staff

main.cpp@2:f1b3a82f7738, 2017-12-04 (annotated)

Committer:
noutram
Date:
Mon Dec 04 16:33:51 2017 +0000
Revision:
2:f1b3a82f7738
Parent:
0:1ce5a958aaf8
Child:
3:528e42a15d44
Excellent release. Give to students ASAP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 2:f1b3a82f7738 1 // NickO 2017
martinsimpson 0:1ce5a958aaf8 2 /* Access an SD Card using SPI */
martinsimpson 0:1ce5a958aaf8 3
martinsimpson 0:1ce5a958aaf8 4 #include "mbed.h"
martinsimpson 0:1ce5a958aaf8 5 #include "SDBlockDevice.h"
martinsimpson 0:1ce5a958aaf8 6 #include "FATFileSystem.h"
noutram 2:f1b3a82f7738 7 #include "sample_hardware.hpp"
martinsimpson 0:1ce5a958aaf8 8
noutram 2:f1b3a82f7738 9 //SD Card Object
martinsimpson 0:1ce5a958aaf8 10 SDBlockDevice sd(D11, D12, D13, D10); // mosi, miso, sclk, cs
martinsimpson 0:1ce5a958aaf8 11
martinsimpson 0:1ce5a958aaf8 12 uint8_t block[512] = "Hello World!\n";
martinsimpson 0:1ce5a958aaf8 13 int main()
martinsimpson 0:1ce5a958aaf8 14 {
noutram 2:f1b3a82f7738 15 //POWER ON SELF TEST
noutram 2:f1b3a82f7738 16 post();
noutram 2:f1b3a82f7738 17
noutram 2:f1b3a82f7738 18 printf("Initialise\n");
martinsimpson 0:1ce5a958aaf8 19 //FileSystemLike(*sd);
martinsimpson 0:1ce5a958aaf8 20
martinsimpson 0:1ce5a958aaf8 21 // call the SDBlockDevice instance initialisation method.
noutram 2:f1b3a82f7738 22 if ( sd.init() != 0) {
martinsimpson 0:1ce5a958aaf8 23 printf("Init failed \n");
noutram 2:f1b3a82f7738 24 errorCode(FATAL);
noutram 2:f1b3a82f7738 25 }
martinsimpson 0:1ce5a958aaf8 26
noutram 2:f1b3a82f7738 27 //Create a filing system for SD Card
martinsimpson 0:1ce5a958aaf8 28 FATFileSystem fs("sd", &sd);
martinsimpson 0:1ce5a958aaf8 29
noutram 2:f1b3a82f7738 30 // *************
noutram 2:f1b3a82f7738 31 // Open to WRITE
noutram 2:f1b3a82f7738 32 // *************
noutram 2:f1b3a82f7738 33 printf("Write to a file\n");
noutram 2:f1b3a82f7738 34 FILE* fp = fopen("/sd/test.txt","w");
noutram 2:f1b3a82f7738 35 //Check file handle (stream)
noutram 2:f1b3a82f7738 36 if (fp == NULL) {
martinsimpson 0:1ce5a958aaf8 37 error("Could not open file for write\n");
noutram 2:f1b3a82f7738 38 errorCode(FATAL);
martinsimpson 0:1ce5a958aaf8 39 }
martinsimpson 0:1ce5a958aaf8 40
martinsimpson 0:1ce5a958aaf8 41 //Put some text in the file...
noutram 2:f1b3a82f7738 42 fprintf(fp, "Welcome to ELEC350\n");
noutram 2:f1b3a82f7738 43
noutram 2:f1b3a82f7738 44 //Close the file
noutram 2:f1b3a82f7738 45 fclose(fp);
martinsimpson 0:1ce5a958aaf8 46
noutram 2:f1b3a82f7738 47 // ************
noutram 2:f1b3a82f7738 48 // Open to READ
noutram 2:f1b3a82f7738 49 // ************
noutram 2:f1b3a82f7738 50 printf("Read a file\n");
noutram 2:f1b3a82f7738 51 fp = fopen("/sd/test.txt","r");
noutram 2:f1b3a82f7738 52 if (fp == NULL) {
noutram 2:f1b3a82f7738 53 error("Could not open file for read\n");
noutram 2:f1b3a82f7738 54 errorCode(FATAL);
noutram 2:f1b3a82f7738 55 }
noutram 2:f1b3a82f7738 56
noutram 2:f1b3a82f7738 57 //Read in three strings
noutram 2:f1b3a82f7738 58 char s1[64], s2[64], s3[64];
noutram 2:f1b3a82f7738 59 fscanf(fp, "%s %s %s", s1,s2,s3);
noutram 2:f1b3a82f7738 60 //To read a whole line, use: fgets(s1, sizeof(s1), fp);
noutram 2:f1b3a82f7738 61 printf("READ BACK: %s %s %s\n", s1, s2, s3);
noutram 2:f1b3a82f7738 62
noutram 2:f1b3a82f7738 63 //Close File
martinsimpson 0:1ce5a958aaf8 64 fclose(fp);
noutram 2:f1b3a82f7738 65
noutram 2:f1b3a82f7738 66 //Close down
martinsimpson 0:1ce5a958aaf8 67 sd.deinit();
martinsimpson 0:1ce5a958aaf8 68 printf("All done...\n");
noutram 2:f1b3a82f7738 69 errorCode(OK);
martinsimpson 0:1ce5a958aaf8 70
noutram 2:f1b3a82f7738 71 //Flash to indicate goodness
noutram 2:f1b3a82f7738 72 while(true) {
noutram 2:f1b3a82f7738 73 greenLED = 1;
noutram 2:f1b3a82f7738 74 wait(0.5);
noutram 2:f1b3a82f7738 75 greenLED = 0;
noutram 2:f1b3a82f7738 76 wait(0.1);
noutram 2:f1b3a82f7738 77 }
noutram 2:f1b3a82f7738 78 }
noutram 2:f1b3a82f7738 79
martinsimpson 0:1ce5a958aaf8 80 /*
martinsimpson 0:1ce5a958aaf8 81 printf("sd size: %llu\n", sd.size());
martinsimpson 0:1ce5a958aaf8 82 printf("sd read size: %llu\n", sd.get_read_size());
martinsimpson 0:1ce5a958aaf8 83 printf("sd program size: %llu\n", sd.get_program_size());
martinsimpson 0:1ce5a958aaf8 84 printf("sd erase size: %llu\n", sd.get_erase_size());
martinsimpson 0:1ce5a958aaf8 85
martinsimpson 0:1ce5a958aaf8 86 // set the frequency
martinsimpson 0:1ce5a958aaf8 87 if ( 0 != sd.frequency(5000000)) {
martinsimpson 0:1ce5a958aaf8 88 printf("Error setting frequency \n");
martinsimpson 0:1ce5a958aaf8 89 }
martinsimpson 0:1ce5a958aaf8 90
martinsimpson 0:1ce5a958aaf8 91 if ( 0 != sd.erase(0, sd.get_erase_size())) {
martinsimpson 0:1ce5a958aaf8 92 printf("Error Erasing block \n");
martinsimpson 0:1ce5a958aaf8 93 }
martinsimpson 0:1ce5a958aaf8 94
martinsimpson 0:1ce5a958aaf8 95 // Write some the data block to the device
martinsimpson 0:1ce5a958aaf8 96 if ( 0 == sd.program(block, 0, 512)) {
martinsimpson 0:1ce5a958aaf8 97 // read the data block from the device
martinsimpson 0:1ce5a958aaf8 98 if ( 0 == sd.read(block, 0, 512)) {
martinsimpson 0:1ce5a958aaf8 99 // print the contents of the block
martinsimpson 0:1ce5a958aaf8 100 printf("%s", block);
martinsimpson 0:1ce5a958aaf8 101 }
martinsimpson 0:1ce5a958aaf8 102 }
martinsimpson 0:1ce5a958aaf8 103
martinsimpson 0:1ce5a958aaf8 104 // call the SDBlockDevice instance de-initialisation method.
martinsimpson 0:1ce5a958aaf8 105
martinsimpson 0:1ce5a958aaf8 106 sd.deinit();
noutram 2:f1b3a82f7738 107 */