Joel Pallent / Mbed OS enviro_copy

sensor

Dependencies:   BMP280 ELEC350-Practicals-FZ429 BME280

main.cpp@4:17fe5b63cd8a, 2017-11-23 (annotated)

Committer:
noutram
Date:
Thu Nov 23 14:01:42 2017 +0000
Revision:
4:17fe5b63cd8a
Parent:
3:22e5460a8b42
Child:
5:e24f1e549da1
Uses and event queue to sample data

Who changed what in which revision?

UserRevisionLine numberNew contents of line
martinsimpson 0:1ce5a958aaf8 1 /* Access an SD Card using SPI */
martinsimpson 0:1ce5a958aaf8 2
martinsimpson 0:1ce5a958aaf8 3 #include "mbed.h"
martinsimpson 0:1ce5a958aaf8 4 #include "SDBlockDevice.h"
martinsimpson 0:1ce5a958aaf8 5 #include "FATFileSystem.h"
noutram 2:fad34c30dcc4 6 #include "sample_hardware.hpp"
noutram 4:17fe5b63cd8a 7 #include "mbed_events.h"
martinsimpson 0:1ce5a958aaf8 8
noutram 2:fad34c30dcc4 9 //SD Card Object
noutram 4:17fe5b63cd8a 10 SDBlockDevice sd(D11, D12, D13, D10); // mosi, miso, sclk, cs
noutram 4:17fe5b63cd8a 11
noutram 4:17fe5b63cd8a 12 //Event queue for main
noutram 4:17fe5b63cd8a 13 EventQueue queue;
noutram 4:17fe5b63cd8a 14
noutram 4:17fe5b63cd8a 15 //File pointer for the SD card
noutram 4:17fe5b63cd8a 16 FILE* fp;
noutram 4:17fe5b63cd8a 17
noutram 4:17fe5b63cd8a 18 //Flag to indicate if the user has ejected the SD card
noutram 4:17fe5b63cd8a 19 bool ejected = false;
martinsimpson 0:1ce5a958aaf8 20
noutram 4:17fe5b63cd8a 21 //This is called every 5 seconds by the main event queue (main thread)
noutram 4:17fe5b63cd8a 22 void takeSample()
noutram 4:17fe5b63cd8a 23 {
noutram 4:17fe5b63cd8a 24 //If the card is unmounted, just return
noutram 4:17fe5b63cd8a 25 if (ejected == true) {
noutram 4:17fe5b63cd8a 26 return;
noutram 4:17fe5b63cd8a 27 }
noutram 4:17fe5b63cd8a 28
noutram 4:17fe5b63cd8a 29 //Read Sensors (I2C)
noutram 4:17fe5b63cd8a 30 float temp = sensor.getTemperature();
noutram 4:17fe5b63cd8a 31 float pressure = sensor.getPressure();
noutram 4:17fe5b63cd8a 32
noutram 4:17fe5b63cd8a 33 //Write to SD Card
noutram 4:17fe5b63cd8a 34 fprintf(fp, "%f,%f\n", temp, pressure);
noutram 4:17fe5b63cd8a 35
noutram 4:17fe5b63cd8a 36 //Flash to indicate the sampling is alive
noutram 4:17fe5b63cd8a 37 redLED = 1;
noutram 4:17fe5b63cd8a 38 Thread::wait(100);
noutram 4:17fe5b63cd8a 39 redLED = 0;
noutram 4:17fe5b63cd8a 40
noutram 4:17fe5b63cd8a 41 //Chheck switches - press both to eject
noutram 4:17fe5b63cd8a 42 if ((SW1 == 1) && (SW2 == 1)) {
noutram 4:17fe5b63cd8a 43 //Close File
noutram 4:17fe5b63cd8a 44 fclose(fp);
noutram 4:17fe5b63cd8a 45
noutram 4:17fe5b63cd8a 46 //Close down SD card (flush buffers)
noutram 4:17fe5b63cd8a 47 sd.deinit();
noutram 4:17fe5b63cd8a 48
noutram 4:17fe5b63cd8a 49 //Let user know
noutram 4:17fe5b63cd8a 50 puts("You can now remove the SD Card\n");
noutram 4:17fe5b63cd8a 51 yellowLED = 1;
noutram 4:17fe5b63cd8a 52
noutram 4:17fe5b63cd8a 53 //Flag to record the event
noutram 4:17fe5b63cd8a 54 ejected = true;
noutram 4:17fe5b63cd8a 55 }
noutram 4:17fe5b63cd8a 56 }
noutram 4:17fe5b63cd8a 57
martinsimpson 0:1ce5a958aaf8 58 int main()
martinsimpson 0:1ce5a958aaf8 59 {
noutram 2:fad34c30dcc4 60 //POWER ON SELF TEST
noutram 2:fad34c30dcc4 61 post();
noutram 2:fad34c30dcc4 62
noutram 2:fad34c30dcc4 63 printf("Initialise\n");
martinsimpson 0:1ce5a958aaf8 64 //FileSystemLike(*sd);
martinsimpson 0:1ce5a958aaf8 65
martinsimpson 0:1ce5a958aaf8 66 // call the SDBlockDevice instance initialisation method.
noutram 2:fad34c30dcc4 67 if ( sd.init() != 0) {
martinsimpson 0:1ce5a958aaf8 68 printf("Init failed \n");
noutram 2:fad34c30dcc4 69 errorCode(FATAL);
noutram 2:fad34c30dcc4 70 }
martinsimpson 0:1ce5a958aaf8 71
noutram 2:fad34c30dcc4 72 //Create a filing system for SD Card
martinsimpson 0:1ce5a958aaf8 73 FATFileSystem fs("sd", &sd);
martinsimpson 0:1ce5a958aaf8 74
noutram 4:17fe5b63cd8a 75 // **************
noutram 4:17fe5b63cd8a 76 // Open to APPEND
noutram 4:17fe5b63cd8a 77 // **************
noutram 4:17fe5b63cd8a 78 fp = fopen("/sd/test.txt","a");
noutram 4:17fe5b63cd8a 79
noutram 2:fad34c30dcc4 80 //Check file handle (stream)
noutram 2:fad34c30dcc4 81 if (fp == NULL) {
martinsimpson 0:1ce5a958aaf8 82 error("Could not open file for write\n");
noutram 2:fad34c30dcc4 83 errorCode(FATAL);
martinsimpson 0:1ce5a958aaf8 84 }
martinsimpson 0:1ce5a958aaf8 85
noutram 4:17fe5b63cd8a 86 //Set up tasks on the main thread
noutram 4:17fe5b63cd8a 87 queue.call_every(5000, takeSample);
martinsimpson 0:1ce5a958aaf8 88
noutram 4:17fe5b63cd8a 89 //Main queue event loop
noutram 4:17fe5b63cd8a 90 queue.dispatch();
martinsimpson 0:1ce5a958aaf8 91
noutram 4:17fe5b63cd8a 92 }