DEBUGG ISR LOOP : MUTEX GUARD PROTECTION LOCK USE SEMAPHORE FOR CALLING PROTECTED FUNCTIONS FROM ISR() BASIC OF SEMAPHORE FUNCTIONS /CREATION /& USE JAYDEEP SHAH - radhey04ec@gmail.com
Diff: main.cpp
- Revision:
- 0:090c812cb33b
diff -r 000000000000 -r 090c812cb33b main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Jul 12 06:35:41 2020 +0000 @@ -0,0 +1,46 @@ +//USE OF PRINTF() STATEMENT IN MBED WITH ISR + +//method : semaphore + +/* NOTE : PRINTF() IS PART OF STDIO.H LIBRARY +AND THIS LIBRARY PROTECTED BY MUTEX GUARD, SO YOU CAN NOT CALL PRINTF() FROM +ISR FUNCTION. +SIMPLE WAY IS USE SOMETYPE OF SIGNAL OR FLAG AND PRINTF() OUTSIDE ISR depends on +flag and signal */ + +//USE SERIAL TERMINAL WITH 9600 BAUD RATE 8-N-1 FORMAT + +//Created by : JAYDEEP SHAH --radhey04ec@gmail.com + + +//Library Added ::::: +#include "mbed.h" + +DigitalOut led(LED1); // ON BOARD LED +InterruptIn btn(USER_BUTTON); // ON BOARD BUTTON PORT PC_13 +//INTERRUPT REGISTERATION + +Semaphore updates(0); //SEMAPHORE OBJECT CREATE = SHARE RESOURCE 0 +//NO SHARE RESOURCE ONLY ISR + +void do_something() { //ISR FUNCTION + // release the semaphore + updates.release(); // NOW V=1 +} + +int main() { + btn.fall(&do_something); + + while (1) { + // wait for the semaphore to be released from the ISR + uint32_t v = updates.wait(); //RETURN STORE IN V + + // now this runs on the main thread, and is safe + if(v == 1) + +{ + led = !led; //LED TOGGLE + printf("Toggle LED!\r\n"); //SERIAL PRINT + } + } +} \ No newline at end of file