Muaiyd Al-Zandi / Mbed 2 deprecated ass2

Embedded software Assessment 2

Dependencies:   MCP23017 SDFileSystem USBDevice WattBob_TextLCD mbed

FreqMesure.h@22:644d53f1f291, 2014-03-05 (annotated)

Committer:
muaiyd
Date:
Wed Mar 05 13:05:41 2014 +0000
Revision:
22:644d53f1f291
Parent:
20:00a9a95ef083 
END!!!!!!!!!!!!!!!!!!!!!!!!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
muaiyd 20:00a9a95ef083 1 /***************************************************************************************
muaiyd 20:00a9a95ef083 2 Measure the frequency of a 3.3v square wave signal once every second. The frequency range
muaiyd 20:00a9a95ef083 3 is 500Hz to 1000Hz with 50% duty cycle). In this code the on complet cycle is peiod is
muaiyd 20:00a9a95ef083 4 masured after detcting the edge also a timeout timer is seting to detect open loop.
muaiyd 20:00a9a95ef083 5 *****************************************************************************************/
muaiyd 20:00a9a95ef083 6
muaiyd 20:00a9a95ef083 7 void FreqMsur(){
muaiyd 20:00a9a95ef083 8 FreqMsurPin = ! (FreqMsurPin); //Pin 23
muaiyd 20:00a9a95ef083 9 FreqTimeOut.start();
muaiyd 20:00a9a95ef083 10 // Ignore first part of the signal to detect the edge
muaiyd 20:00a9a95ef083 11 if(!FrequencyIn){
muaiyd 20:00a9a95ef083 12 while(!FrequencyIn){
muaiyd 22:644d53f1f291 13 if (FreqTimeOut.read_ms() > 3)
muaiyd 20:00a9a95ef083 14 break;
muaiyd 20:00a9a95ef083 15 }
muaiyd 20:00a9a95ef083 16 }
muaiyd 20:00a9a95ef083 17 else{
muaiyd 20:00a9a95ef083 18 while(FrequencyIn){
muaiyd 22:644d53f1f291 19 if (FreqTimeOut.read_ms() > 3)
muaiyd 20:00a9a95ef083 20 break;
muaiyd 20:00a9a95ef083 21 }
muaiyd 20:00a9a95ef083 22 }
muaiyd 20:00a9a95ef083 23 //This is the begining of the edge start the timer to masure
muaiyd 20:00a9a95ef083 24 FreqMsurT.start();
muaiyd 22:644d53f1f291 25 if (FreqTimeOut.read_ms() > 3){
muaiyd 20:00a9a95ef083 26 FreqTimeOutHpn=1;
muaiyd 20:00a9a95ef083 27 }
muaiyd 20:00a9a95ef083 28 else{
muaiyd 20:00a9a95ef083 29 FreqTimeOutHpn=0;
muaiyd 20:00a9a95ef083 30 }
muaiyd 20:00a9a95ef083 31 FreqTimeOut.stop();
muaiyd 20:00a9a95ef083 32 FreqTimeOut.reset();
muaiyd 20:00a9a95ef083 33 if(!FreqTimeOutHpn){
muaiyd 20:00a9a95ef083 34 if(!FrequencyIn){
muaiyd 20:00a9a95ef083 35 while(!FrequencyIn){
muaiyd 20:00a9a95ef083 36 }
muaiyd 20:00a9a95ef083 37 while(FrequencyIn){
muaiyd 20:00a9a95ef083 38 }
muaiyd 20:00a9a95ef083 39 }
muaiyd 20:00a9a95ef083 40 else{
muaiyd 20:00a9a95ef083 41 while(FrequencyIn){
muaiyd 20:00a9a95ef083 42 }
muaiyd 20:00a9a95ef083 43 while(!FrequencyIn){
muaiyd 20:00a9a95ef083 44 }
muaiyd 20:00a9a95ef083 45 }
muaiyd 20:00a9a95ef083 46 FreqMsurT.stop();
muaiyd 20:00a9a95ef083 47 float Period=FreqMsurT.read_us();
muaiyd 20:00a9a95ef083 48 Freq=1/Period*1000000.0+0.5; //Adding 0.5 to round the frequency to nearst int
muaiyd 20:00a9a95ef083 49 }
muaiyd 20:00a9a95ef083 50 else{
muaiyd 20:00a9a95ef083 51 Freq=0xffff;
muaiyd 20:00a9a95ef083 52 }
muaiyd 20:00a9a95ef083 53 FreqTimeOut.stop();
muaiyd 20:00a9a95ef083 54 FreqMsurT.reset();
muaiyd 22:644d53f1f291 55 //FreqMsurPin = ! (FreqMsurPin);
muaiyd 20:00a9a95ef083 56 }