Jaydeep Shah / Mbed OS 12) SEMAPHORE_PART3

SEMAPHORE PART 3 SEMAPHORE FUNCTION : try_acquire_until(ms) use -- replacement of wait_until() function SEMAPHORE ADVANCE LEVEL Jaydeep Shah -- radhey04ec@gmail.com

main.cpp@0:e003548e7f74, 2020-07-12 (annotated)

Committer:
radhey04ec
Date:
Sun Jul 12 09:37:28 2020 +0000
Revision:
0:e003548e7f74
SEMAPHORE PART 3; USAGE OF try_acquire_until() function; SEMAPHORE ADVANCE LEVEL; ; Jaydeep Shah--radhey04ec@gmail.com

Who changed what in which revision?

UserRevisionLine numberNew contents of line
radhey04ec 0:e003548e7f74 1 /*SEMAPHORE PART 3
radhey04ec 0:e003548e7f74 2 FUNCTION USE : try_acquire_until(uint32_t miliSecond)
radhey04ec 0:e003548e7f74 3 return bool = true /false
radhey04ec 0:e003548e7f74 4
radhey04ec 0:e003548e7f74 5 REPLACEMENT OF wait_until(uint64_t milisecond)
radhey04ec 0:e003548e7f74 6 */
radhey04ec 0:e003548e7f74 7
radhey04ec 0:e003548e7f74 8 //USE SERIAL TERMINAL WITH 9600 BAUD RATE 8-N-1 FORMAT
radhey04ec 0:e003548e7f74 9
radhey04ec 0:e003548e7f74 10 //Created by : JAYDEEP SHAH --radhey04ec@gmail.com
radhey04ec 0:e003548e7f74 11
radhey04ec 0:e003548e7f74 12
radhey04ec 0:e003548e7f74 13 //Library Added :::::
radhey04ec 0:e003548e7f74 14 #include "mbed.h"
radhey04ec 0:e003548e7f74 15
radhey04ec 0:e003548e7f74 16 DigitalOut led(LED1); // ON BOARD LED
radhey04ec 0:e003548e7f74 17 InterruptIn btn(USER_BUTTON); // ON BOARD BUTTON PORT PC_13
radhey04ec 0:e003548e7f74 18 //INTERRUPT REGISTERATION
radhey04ec 0:e003548e7f74 19
radhey04ec 0:e003548e7f74 20 Semaphore updates(0); //SEMAPHORE OBJECT CREATE = SHARE RESOURCE 0
radhey04ec 0:e003548e7f74 21 //NO SHARE RESOURCE ONLY ISR
radhey04ec 0:e003548e7f74 22
radhey04ec 0:e003548e7f74 23 void do_something() { //ISR FUNCTION
radhey04ec 0:e003548e7f74 24 // release the semaphore
radhey04ec 0:e003548e7f74 25 updates.release(); // NOW V=1
radhey04ec 0:e003548e7f74 26 }
radhey04ec 0:e003548e7f74 27
radhey04ec 0:e003548e7f74 28 int main() {
radhey04ec 0:e003548e7f74 29 btn.fall(&do_something); //FUNCTION CALL WHEN FALL EDGE OF BUTTON - ISR
radhey04ec 0:e003548e7f74 30
radhey04ec 0:e003548e7f74 31 while (1) { //LOOP FOREVER
radhey04ec 0:e003548e7f74 32 // wait for the semaphore to be released from the ISR
radhey04ec 0:e003548e7f74 33 bool v = updates.try_acquire_until(30000); //RETURN STORE IN V //WAIT FOR 30 SEC
radhey04ec 0:e003548e7f74 34
radhey04ec 0:e003548e7f74 35 // now this runs on the main thread, and is safe
radhey04ec 0:e003548e7f74 36
radhey04ec 0:e003548e7f74 37 if(v==1) //THIS ONLY RUN WHEN BUTTON PRESS & SEMAPHORE RELEASE BY 1
radhey04ec 0:e003548e7f74 38 {
radhey04ec 0:e003548e7f74 39 led = !led; //LED TOGGLE
radhey04ec 0:e003548e7f74 40 printf("Toggle LED! V= %d \r\n",v); //SERIAL PRINT V === 0 AGAIN
radhey04ec 0:e003548e7f74 41 }
radhey04ec 0:e003548e7f74 42
radhey04ec 0:e003548e7f74 43 if(v == 0) // This Function run after 30 sec of Power on/RST Continue -- NO matter button press or not
radhey04ec 0:e003548e7f74 44 {
radhey04ec 0:e003548e7f74 45 printf("\n TIMER RELEASE SEMAPHORE V = %d \r\n",v);
radhey04ec 0:e003548e7f74 46 }
radhey04ec 0:e003548e7f74 47
radhey04ec 0:e003548e7f74 48 }
radhey04ec 0:e003548e7f74 49 }