Jasper Sikken / Mbed 2 deprecated HeartRate

This program displays heart rate and time between heart beats on LCD, prints it to a USB serial port, print it to a bluetooth serial port and store it on a USB mass storage device. The program has two interrupt routines: 1.Every 1ms a counter is increased with one, 2. On every heart beat the counter is value copied. In the main loop the beats per minute are calculated. Ext.Modules:- Polar RMCM-01 heart rate module connected to pin8. - 2x16 LCD - a RF-BT0417CB bluetooth serial device connected to p27 and p28 - an USB mass storage device

Dependencies:   TextLCD mbed

main.cpp@1:8b001f936bb0, 2010-11-27 (annotated)

Committer:
jrsikken
Date:
Sat Nov 27 11:13:20 2010 +0000
Revision:
1:8b001f936bb0
Parent:
0:939617e180e8
Child:
2:e660e68a91fa
Now heart rate is stored on USB mass storage device.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jrsikken 1:8b001f936bb0 1 //This program displays heart rate and time between heart beats on LCD, serial port and on a USB mass storage device.
jrsikken 0:939617e180e8 2 //The program has two interrupt routines: 1.Every 1ms a counter is increased with one, 2. On every heart beat the counter is value copied.
jrsikken 0:939617e180e8 3 //In the main loop the beats per minute are calculated.
jrsikken 0:939617e180e8 4 //Ext.Modules: -Polar RMCM-01 heart rate module connected to pin8.
jrsikken 1:8b001f936bb0 5 // -2x16 LCD
jrsikken 0:939617e180e8 6
jrsikken 0:939617e180e8 7 #include "mbed.h"
jrsikken 0:939617e180e8 8 #include "TextLCD.h"
jrsikken 1:8b001f936bb0 9 #include "MSCFileSystem.h"
jrsikken 1:8b001f936bb0 10 #define FSNAME "msc"
jrsikken 1:8b001f936bb0 11 MSCFileSystem msc(FSNAME);
jrsikken 0:939617e180e8 12
jrsikken 1:8b001f936bb0 13 Timer t; // counts the time from beginning of main loop
jrsikken 0:939617e180e8 14 TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3
jrsikken 1:8b001f936bb0 15 InterruptIn beat(p8); // beat is the name for a inteerupt on pin 8
jrsikken 1:8b001f936bb0 16 DigitalOut led(LED1); // this led is toggled on every heart beat
jrsikken 1:8b001f936bb0 17 Ticker mscnt; // this is used to create a ms counter
jrsikken 0:939617e180e8 18
jrsikken 0:939617e180e8 19 //initialize
jrsikken 0:939617e180e8 20 int count, CNT,displayBPMFlag ;
jrsikken 0:939617e180e8 21
jrsikken 1:8b001f936bb0 22 void ms_counter() { //this interrupt routine starts every ms
jrsikken 1:8b001f936bb0 23 count++; //the counter is increased with 1
jrsikken 1:8b001f936bb0 24 if (count>1999) { //when no heart beat is detected for >2ms, then display "-" in the main loop
jrsikken 0:939617e180e8 25 CNT=count; // copy counter value to CNT
jrsikken 0:939617e180e8 26 displayBPMFlag = 1; // set flag that the BPM can be put to LCD in the main loop
jrsikken 0:939617e180e8 27 count=0; // reset counter value
jrsikken 0:939617e180e8 28 }
jrsikken 0:939617e180e8 29 }
jrsikken 0:939617e180e8 30
jrsikken 0:939617e180e8 31 void flip() { //this interrupt routine starts on every heart beat
jrsikken 0:939617e180e8 32 CNT = count; // copy counter value to CNT
jrsikken 0:939617e180e8 33 count = 0 ; // reset counter value
jrsikken 0:939617e180e8 34 displayBPMFlag = 1; // set flag that the BPM can be put to LCD in the main loop
jrsikken 0:939617e180e8 35 led = !led; // toggle the led on/off
jrsikken 0:939617e180e8 36 }
jrsikken 0:939617e180e8 37
jrsikken 0:939617e180e8 38 int main() {
jrsikken 1:8b001f936bb0 39 t.start(); // The ti
jrsikken 0:939617e180e8 40 int BPM; //initialize BPM
jrsikken 0:939617e180e8 41 lcd.cls(); //clear the lcd display
jrsikken 0:939617e180e8 42 mscnt.attach_us(&ms_counter, 1000); // the address of the function to be attached (ms_counter) and the interval (1ms)
jrsikken 0:939617e180e8 43 beat.rise(&flip); // attach the address of the flip function to the rising edge
jrsikken 0:939617e180e8 44 while (1) {
jrsikken 0:939617e180e8 45 if (displayBPMFlag == 1) { // program loops around in here
jrsikken 0:939617e180e8 46 displayBPMFlag = 0; // clear displayBPMflag
jrsikken 0:939617e180e8 47 if (CNT>250&CNT<2000) { //when heart rate is within 30-240BPM
jrsikken 0:939617e180e8 48 BPM = 60000/CNT; //calculate BPM
jrsikken 0:939617e180e8 49 lcd.cls(); //clear the lcd display
jrsikken 0:939617e180e8 50 lcd.locate(0,0); //set cursor to first character and first line
jrsikken 0:939617e180e8 51 lcd.printf("%i ms", CNT); //display the time in ms on the lcd
jrsikken 0:939617e180e8 52 lcd.locate(0,1); //set cursor to first character and second line
jrsikken 0:939617e180e8 53 lcd.printf("%i BPM",BPM); //display the beats per minute on the lcd
jrsikken 1:8b001f936bb0 54 printf("%i\r\n",CNT); //print time between heart beats to the serial port
jrsikken 1:8b001f936bb0 55 FILE *fp = fopen( "/msc/HR.txt", "a+");//Open file on USB Mass Storage device, 8.3 filesystem, open for write and append
jrsikken 1:8b001f936bb0 56 if ( fp == NULL )error("Could not open file for write\n"); // error code
jrsikken 1:8b001f936bb0 57 fprintf(fp, "%f %i\r\n",t.read(),BPM);//write time-since-start-main-loop and BPM to file
jrsikken 1:8b001f936bb0 58 fclose(fp); // close file
jrsikken 0:939617e180e8 59 } else {//when heart rate is NOT within 30-240BPM
jrsikken 0:939617e180e8 60 lcd.cls(); //clear the lcd display
jrsikken 0:939617e180e8 61 lcd.locate(0,0); //set cursor to first character and first line
jrsikken 0:939617e180e8 62 lcd.printf("- ms"); //display empty time in ms on the lcd
jrsikken 0:939617e180e8 63 lcd.locate(0,1); //set cursor to first character and second line
jrsikken 0:939617e180e8 64 lcd.printf("- BPM"); //display empty beats per minute on the lcd
jrsikken 0:939617e180e8 65 printf("- \r\n", CNT); //print the time in ms to the serial port
jrsikken 0:939617e180e8 66 }
jrsikken 0:939617e180e8 67
jrsikken 0:939617e180e8 68 }
jrsikken 0:939617e180e8 69
jrsikken 0:939617e180e8 70 }
jrsikken 1:8b001f936bb0 71
jrsikken 1:8b001f936bb0 72 }