SEMAPHORE PART 3 SEMAPHORE FUNCTION : try_acquire_until(ms) use -- replacement of wait_until() function SEMAPHORE ADVANCE LEVEL Jaydeep Shah -- radhey04ec@gmail.com
Diff: main.cpp
- Revision:
- 0:e003548e7f74
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Jul 12 09:37:28 2020 +0000 @@ -0,0 +1,49 @@ +/*SEMAPHORE PART 3 +FUNCTION USE : try_acquire_until(uint32_t miliSecond) +return bool = true /false + +REPLACEMENT OF wait_until(uint64_t milisecond) +*/ + +//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); //FUNCTION CALL WHEN FALL EDGE OF BUTTON - ISR + + while (1) { //LOOP FOREVER + // wait for the semaphore to be released from the ISR + bool v = updates.try_acquire_until(30000); //RETURN STORE IN V //WAIT FOR 30 SEC + + // now this runs on the main thread, and is safe + + if(v==1) //THIS ONLY RUN WHEN BUTTON PRESS & SEMAPHORE RELEASE BY 1 +{ + led = !led; //LED TOGGLE + printf("Toggle LED! V= %d \r\n",v); //SERIAL PRINT V === 0 AGAIN + } + + if(v == 0) // This Function run after 30 sec of Power on/RST Continue -- NO matter button press or not + { + printf("\n TIMER RELEASE SEMAPHORE V = %d \r\n",v); + } + + } +} \ No newline at end of file