L B / Mbed OS RTOS Example: RTOS Serial Interrupt As High Priority Thread

Instead of using an interrupt to read a serial message, a thread is created within the interrupt that reads serial data coming in. Original project for LPC1768.

main.cpp

Committer:
Ritzerk
Date:
2019-03-07
Revision:
1:5438da9e6654
Parent:
0:f28b116a2be0
Child:
2:65ff74ea1476

File content as of revision 1:5438da9e6654:

#include "mbed.h"

Thread ISRthread(osPriorityAboveNormal);
osThreadId ISRthreadId;

RawSerial pc(USBTX, USBRX);
Mutex serial_mutex;

DigitalOut myled(LED1);
DigitalOut myled4(LED4);

void newInput();
void ISR_thread();

int main() {
    
   ISRthread.start(callback(ISR_thread));
   pc.attach(&newInput);                                      //interrupt to catch input
   
    while(1) {
        myled4 = 1;
    }
}


void newInput() {
    pc.attach(NULL);                                           //deatch the ISR to prevent recursive calls
    osSignalSet(ISRthreadId,0x01);
}


void ISR_thread() {
    ISRthreadId = osThreadGetId();
    for(;;) {
        osSignalWait(0x01, osWaitForever);
        
        while (pc.readable()) {
            pc.putc(pc.getc());
        }
        myled = 1;
        osDelay(50);
        myled = 0;
        pc.attach(&newInput);                                     //re-attach the ISR
    }
}