Comparing a wait with yield vs a polling-busy-wait
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main.cpp
- Committer:
- noutram
- Date:
- 2017-04-03
- Revision:
- 8:2deeed44c6c3
- Parent:
- 7:cd015e83995a
File content as of revision 8:2deeed44c6c3:
#include "mbed.h" #include "rtos.h" #include "string.h" #include <stdio.h> #include <ctype.h> #define DELAY 200 //Digital outputs DigitalOut onBoardLED(LED1); DigitalOut redLED(D7); DigitalOut yellowLED(D6); DigitalOut greenLED(D5); //Serial Interface Serial pc(USBTX, USBRX); //Digital inputs DigitalIn onBoardSwitch(USER_BUTTON); DigitalIn SW1(D4); DigitalIn SW2(D3); //Thread ID for the Main function (CMSIS API) osThreadId tidMain; void thread1() { pc.printf("Entering thread 1\n"); while (true) { yellowLED = 1; Thread::wait(DELAY); yellowLED = 0; Thread::wait(DELAY); } } //This thread has higher priority void thread2() { pc.printf("Entering thread 2\n"); while (true) { redLED = 1; if (SW1 == 1) { // 1) Select the 'type' of wait //wait_ms(osWaitForever); Thread::wait(osWaitForever); } else { Thread::wait(DELAY); } redLED = 0; Thread::wait(DELAY); } } //Main thread int main() { redLED = 0; yellowLED = 0; greenLED = 0; //Main thread ID tidMain = Thread::gettid(); Thread t1(osPriorityNormal); t1.start(thread1); // 2) Select the Thread Priority //Thread t2(thread2, NULL, osPriorityNormal); Thread t2(osPriorityAboveNormal); t2.start(thread2); pc.printf("Main Thread\n"); while (true) { Thread::wait(osWaitForever); } }