main.cpp

00001 /*SEMAPHORE PART 3
00002 FUNCTION USE : try_acquire_until(uint32_t miliSecond)
00003 return bool = true /false
00004 
00005 REPLACEMENT OF wait_until(uint64_t milisecond)
00006 */
00007 
00008 //USE SERIAL TERMINAL WITH 9600 BAUD RATE  8-N-1 FORMAT
00009 
00010 //Created by : JAYDEEP SHAH  --radhey04ec@gmail.com
00011 
00012 
00013 //Library Added :::::
00014 #include "mbed.h"
00015 
00016 DigitalOut led(LED1);  // ON BOARD LED
00017 InterruptIn btn(USER_BUTTON);  // ON BOARD BUTTON  PORT PC_13 
00018 //INTERRUPT REGISTERATION
00019 
00020 Semaphore updates(0);  //SEMAPHORE OBJECT CREATE = SHARE RESOURCE 0
00021 //NO SHARE RESOURCE ONLY ISR
00022 
00023 void do_something() {        //ISR FUNCTION
00024   // release the semaphore
00025   updates.release();   // NOW V=1
00026 }
00027 
00028 int main() {
00029   btn.fall(&do_something);  //FUNCTION CALL WHEN FALL EDGE OF BUTTON - ISR
00030 
00031   while (1) {  //LOOP FOREVER
00032     // wait for the semaphore to be released from the ISR
00033     bool v = updates.try_acquire_until(30000);    //RETURN STORE IN V   //WAIT FOR 30 SEC
00034 
00035     // now this runs on the main thread, and is safe
00036 
00037     if(v==1)  //THIS ONLY RUN WHEN BUTTON PRESS & SEMAPHORE RELEASE BY 1
00038 {
00039       led = !led;    //LED TOGGLE
00040       printf("Toggle LED! V= %d \r\n",v);  //SERIAL PRINT  V  === 0 AGAIN
00041     }
00042     
00043     if(v == 0)  // This Function run after 30 sec of Power on/RST Continue   -- NO matter button press or not
00044     {
00045     printf("\n TIMER RELEASE SEMAPHORE V = %d \r\n",v);
00046   }
00047   
00048   }
00049 }