Nicholas Outram / Mbed OS Task327

Lab version

main.cpp@1:ae5e3d046c77, 2017-07-13 (annotated)

Committer:
noutram
Date:
Thu Jul 13 14:49:02 2017 +0000
Revision:
1:ae5e3d046c77
Parent:
0:bf0e4c6e1f4d 
updated for mbed-os 5.5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:bf0e4c6e1f4d 1 #include "mbed.h"
noutram 0:bf0e4c6e1f4d 2
noutram 0:bf0e4c6e1f4d 3 void sw1TimeOutHandler();
noutram 0:bf0e4c6e1f4d 4 void sw1RisingEdge();
noutram 0:bf0e4c6e1f4d 5 void sw1FallingEdge();
noutram 0:bf0e4c6e1f4d 6
noutram 0:bf0e4c6e1f4d 7
noutram 0:bf0e4c6e1f4d 8 #define EDGE_RISEN 1
noutram 0:bf0e4c6e1f4d 9 #define EDGE_FALLEN 0
noutram 0:bf0e4c6e1f4d 10
noutram 0:bf0e4c6e1f4d 11 //Global Objects
noutram 0:bf0e4c6e1f4d 12 DigitalOut red_led(D7);
noutram 0:bf0e4c6e1f4d 13 DigitalOut green_led(D5);
noutram 0:bf0e4c6e1f4d 14 InterruptIn sw1(D4);
noutram 0:bf0e4c6e1f4d 15 InterruptIn sw2(D3);
noutram 0:bf0e4c6e1f4d 16
noutram 0:bf0e4c6e1f4d 17 Timeout sw1TimeOut; //Used to prevent switch bounce
noutram 0:bf0e4c6e1f4d 18 int sw1State = EDGE_FALLEN; //Initial state for switch 1
noutram 0:bf0e4c6e1f4d 19
noutram 0:bf0e4c6e1f4d 20 //Interrupt service routine for handling the timeout
noutram 0:bf0e4c6e1f4d 21 void sw1TimeOutHandler() {
noutram 0:bf0e4c6e1f4d 22 sw1TimeOut.detach(); //Stop the timeout counter firing
noutram 0:bf0e4c6e1f4d 23
noutram 0:bf0e4c6e1f4d 24 //Which event does this follow?
noutram 0:bf0e4c6e1f4d 25 switch (sw1State) {
noutram 0:bf0e4c6e1f4d 26 case EDGE_RISEN:
noutram 0:bf0e4c6e1f4d 27 sw1.fall(&sw1FallingEdge); //Now wait for a falling edge
noutram 0:bf0e4c6e1f4d 28 break;
noutram 0:bf0e4c6e1f4d 29 case EDGE_FALLEN:
noutram 0:bf0e4c6e1f4d 30 sw1.rise(&sw1RisingEdge); //Now wait for a rising edge
noutram 0:bf0e4c6e1f4d 31 break;
noutram 0:bf0e4c6e1f4d 32 } //end switch
noutram 0:bf0e4c6e1f4d 33 }
noutram 0:bf0e4c6e1f4d 34
noutram 0:bf0e4c6e1f4d 35 //Interrupt service routine for a rising edge (press)
noutram 0:bf0e4c6e1f4d 36 void sw1RisingEdge() {
noutram 0:bf0e4c6e1f4d 37 sw1.rise(NULL); //Disable detecting more rising edges
noutram 0:bf0e4c6e1f4d 38 sw1State = EDGE_RISEN; //Flag state
noutram 0:bf0e4c6e1f4d 39 sw1TimeOut.attach(&sw1TimeOutHandler, 0.2); //Start timeout timer
noutram 0:bf0e4c6e1f4d 40 }
noutram 0:bf0e4c6e1f4d 41
noutram 0:bf0e4c6e1f4d 42 //Interrupt service routive for SW1 falling edge (release)
noutram 0:bf0e4c6e1f4d 43 void sw1FallingEdge() {
noutram 0:bf0e4c6e1f4d 44 sw1.fall(NULL); //Disable this interrupt
noutram 0:bf0e4c6e1f4d 45 red_led = !red_led; //Toggle LED
noutram 0:bf0e4c6e1f4d 46 sw1State = EDGE_FALLEN; //Flag state
noutram 0:bf0e4c6e1f4d 47 sw1TimeOut.attach(&sw1TimeOutHandler, 0.2); //Start timeout counter
noutram 0:bf0e4c6e1f4d 48 }
noutram 0:bf0e4c6e1f4d 49
noutram 0:bf0e4c6e1f4d 50 //Main - only has to initialise and sleep
noutram 0:bf0e4c6e1f4d 51 int main() {
noutram 0:bf0e4c6e1f4d 52 //Initial logging message
noutram 0:bf0e4c6e1f4d 53 puts("START");
noutram 0:bf0e4c6e1f4d 54
noutram 0:bf0e4c6e1f4d 55 //Initial state
noutram 0:bf0e4c6e1f4d 56 red_led = 0; //Set RED LED to OFF
noutram 0:bf0e4c6e1f4d 57 green_led = 1;
noutram 0:bf0e4c6e1f4d 58
noutram 0:bf0e4c6e1f4d 59 //Configure interrupts, wait for first rising edge
noutram 0:bf0e4c6e1f4d 60 sw1.rise(&sw1RisingEdge);
noutram 0:bf0e4c6e1f4d 61
noutram 0:bf0e4c6e1f4d 62 //Main Polling Loop
noutram 0:bf0e4c6e1f4d 63 while (true) {
noutram 0:bf0e4c6e1f4d 64
noutram 0:bf0e4c6e1f4d 65 //Put CPU back to sleep
noutram 0:bf0e4c6e1f4d 66 sleep();
noutram 0:bf0e4c6e1f4d 67
noutram 0:bf0e4c6e1f4d 68 //You can ONLY reach this point if an ISR wakes the CPU
noutram 0:bf0e4c6e1f4d 69 puts("ISR just woke the MPU");
noutram 0:bf0e4c6e1f4d 70
noutram 0:bf0e4c6e1f4d 71 } //end while
noutram 0:bf0e4c6e1f4d 72
noutram 0:bf0e4c6e1f4d 73 }