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);
+  }
+  
+  }
+}
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