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@2:65ff74ea1476, 2019-03-07 (annotated)

Committer:
Ritzerk
Date:
Thu Mar 07 16:33:37 2019 +0000
Revision:
2:65ff74ea1476
Parent:
1:5438da9e6654 
Removed mutex, serial already uses mutex

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ritzerk 0:f28b116a2be0 1 #include "mbed.h"
Ritzerk 0:f28b116a2be0 2
Ritzerk 0:f28b116a2be0 3 Thread ISRthread(osPriorityAboveNormal);
Ritzerk 0:f28b116a2be0 4 osThreadId ISRthreadId;
Ritzerk 0:f28b116a2be0 5
Ritzerk 1:5438da9e6654 6 RawSerial pc(USBTX, USBRX);
Ritzerk 1:5438da9e6654 7
Ritzerk 0:f28b116a2be0 8 DigitalOut myled(LED1);
Ritzerk 1:5438da9e6654 9 DigitalOut myled4(LED4);
Ritzerk 0:f28b116a2be0 10
Ritzerk 0:f28b116a2be0 11 void newInput();
Ritzerk 0:f28b116a2be0 12 void ISR_thread();
Ritzerk 0:f28b116a2be0 13
Ritzerk 0:f28b116a2be0 14 int main() {
Ritzerk 0:f28b116a2be0 15
Ritzerk 0:f28b116a2be0 16 ISRthread.start(callback(ISR_thread));
Ritzerk 1:5438da9e6654 17 pc.attach(&newInput); //interrupt to catch input
Ritzerk 0:f28b116a2be0 18
Ritzerk 0:f28b116a2be0 19 while(1) {
Ritzerk 1:5438da9e6654 20 myled4 = 1;
Ritzerk 0:f28b116a2be0 21 }
Ritzerk 0:f28b116a2be0 22 }
Ritzerk 0:f28b116a2be0 23
Ritzerk 0:f28b116a2be0 24
Ritzerk 0:f28b116a2be0 25 void newInput() {
Ritzerk 1:5438da9e6654 26 pc.attach(NULL); //deatch the ISR to prevent recursive calls
Ritzerk 0:f28b116a2be0 27 osSignalSet(ISRthreadId,0x01);
Ritzerk 0:f28b116a2be0 28 }
Ritzerk 0:f28b116a2be0 29
Ritzerk 0:f28b116a2be0 30
Ritzerk 0:f28b116a2be0 31 void ISR_thread() {
Ritzerk 0:f28b116a2be0 32 ISRthreadId = osThreadGetId();
Ritzerk 0:f28b116a2be0 33 for(;;) {
Ritzerk 0:f28b116a2be0 34 osSignalWait(0x01, osWaitForever);
Ritzerk 1:5438da9e6654 35
Ritzerk 1:5438da9e6654 36 while (pc.readable()) {
Ritzerk 1:5438da9e6654 37 pc.putc(pc.getc());
Ritzerk 1:5438da9e6654 38 }
Ritzerk 1:5438da9e6654 39 myled = 1;
Ritzerk 1:5438da9e6654 40 osDelay(50);
Ritzerk 1:5438da9e6654 41 myled = 0;
Ritzerk 1:5438da9e6654 42 pc.attach(&newInput); //re-attach the ISR
Ritzerk 0:f28b116a2be0 43 }
Ritzerk 0:f28b116a2be0 44 }