Daniel Blomdahl / Mbed 2 deprecated multiple_variable_temp

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Dependencies:   MAX31855 SDFileSystem mbed

SDSaveFunction.cpp@3:9339e7b93415, 2016-03-14 (annotated)

Committer:
DanielBlomdahl
Date:
Mon Mar 14 20:41:22 2016 +0000
Revision:
3:9339e7b93415
Child:
5:a85aa204463b
This is the March 14th update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DanielBlomdahl 3:9339e7b93415 1 /* Program demonstrating data logging to SD card Analog data is read in (from a potentiometer). The time since program start and the voltage are written to a tab-delimited data file.
DanielBlomdahl 3:9339e7b93415 2 */
DanielBlomdahl 3:9339e7b93415 3 #include "mbed.h"
DanielBlomdahl 3:9339e7b93415 4 #include "SDFileSystem.h"
DanielBlomdahl 3:9339e7b93415 5
DanielBlomdahl 3:9339e7b93415 6
DanielBlomdahl 3:9339e7b93415 7 //Create an SDFileSystem object
DanielBlomdahl 3:9339e7b93415 8
DanielBlomdahl 3:9339e7b93415 9 SDFileSystem fs(NC, PTD3, PTD1, , "fs");
DanielBlomdahl 3:9339e7b93415 10
DanielBlomdahl 3:9339e7b93415 11 Serial pc(USBTX,USBRX);
DanielBlomdahl 3:9339e7b93415 12 SPI spi(NC,PTD3,PTD1);
DanielBlomdahl 3:9339e7b93415 13
DanielBlomdahl 3:9339e7b93415 14 Timer t;
DanielBlomdahl 3:9339e7b93415 15 Ticker sampleTime;
DanielBlomdahl 3:9339e7b93415 16 FILE *fp;
DanielBlomdahl 3:9339e7b93415 17 bool mountFailure;
DanielBlomdahl 3:9339e7b93415 18 void writeData();
DanielBlomdahl 3:9339e7b93415 19 int main() {
DanielBlomdahl 3:9339e7b93415 20 //Mount the filesystem
DanielBlomdahl 3:9339e7b93415 21 mountFailure = fs.mount();
DanielBlomdahl 3:9339e7b93415 22 if (mountFailure != 0) {
DanielBlomdahl 3:9339e7b93415 23 pc.printf("Failed to mount the SD card.\n\r");
DanielBlomdahl 3:9339e7b93415 24 return -1; // ends program with error status }
DanielBlomdahl 3:9339e7b93415 25 fp = fopen("/fs/dataLog.txt", "w"); // Open file and prepare to write
DanielBlomdahl 3:9339e7b93415 26 if (fp == NULL) {
DanielBlomdahl 3:9339e7b93415 27 pc.printf("Failed
DanielBlomdahl 3:9339e7b93415 28 fs.unmount();
DanielBlomdahl 3:9339e7b93415 29 return -1;
DanielBlomdahl 3:9339e7b93415 30 }
DanielBlomdahl 3:9339e7b93415 31 // Write a header row
DanielBlomdahl 3:9339e7b93415 32 fprintf(fp, "Time (s)
DanielBlomdahl 3:9339e7b93415 33 // If open failed, exit well to open the file.\n\r");
DanielBlomdahl 3:9339e7b93415 34 \t Voltage (V)\n\r");
DanielBlomdahl 3:9339e7b93415 35 // Start the Timer and the Ticker
DanielBlomdahl 3:9339e7b93415 36 t.start();
DanielBlomdahl 3:9339e7b93415 37 sampleTime.attach(&writeData, 0.1); // write data every 100 ms
DanielBlomdahl 3:9339e7b93415 38 while (t.read()<5) {
DanielBlomdahl 3:9339e7b93415 39 }
DanielBlomdahl 3:9339e7b93415 40 // Done so remove the sampleTime ticker before it attempts to write again sampleTime.detach();
DanielBlomdahl 3:9339e7b93415 41 // Close the file and unmount the file system so the SD card is happy fclose(fp);
DanielBlomdahl 3:9339e7b93415 42 fs.unmount();
DanielBlomdahl 3:9339e7b93415 43 pc.printf("It is now safe to remove the memory card.\r\n"); }
DanielBlomdahl 3:9339e7b93415 44 void writeData() {
DanielBlomdahl 3:9339e7b93415 45 fprintf(fp, "%.2f \t %.2f\n\r", t.read(), 3.3*pot.read());
DanielBlomdahl 3:9339e7b93415 46 }