Revision 0:747de80ae2bd, committed 2020-08-05

Comitter:

radhey04ec

Date:

Wed Aug 05 07:15:14 2020 +0000

Child:

1:9dbbb3022957

Commit message:

EVENT , FLAG AND SIGNAL CONCEPT DEMO; PROGRAM CHECKED : SUCCESSFULLY

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.gitignore	Wed Aug 05 07:15:14 2020 +0000
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+.build
+.mbed
+projectfiles
+*.py*

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CONTRIBUTING.md	Wed Aug 05 07:15:14 2020 +0000
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+# Contributing to Mbed OS
+
+Mbed OS is an open-source, device software platform for the Internet of Things. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
+
+To encourage productive collaboration, as well as robust, consistent and maintainable code, we have a set of guidelines for [contributing to Mbed OS](https://os.mbed.com/docs/mbed-os/latest/contributing/index.html).

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README.md	Wed Aug 05 07:15:14 2020 +0000
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+SIGNAL USAGE INSIDE RTOS
+
+
+What is Signal ?  - Answer : Remember these five points
+
+1) Signals are different from all the other types of kernel object in that they are not autonomous (user need to control or set - No automatioc control like semaphore)
+2) signals are associated with tasks/Threads and have no independent existence. 
+3) If signals are configured for an application, each task has a set of eight signal flags.
+
+4) Any task can set the signals of another task. Only the owner task can read the signals. 
+5) The read is destructive – i.e. the signals are cleared by the process of reading. No other task can read or clear a task’s signals.
+
+JAYDEEP SHAH
+radhey04ec@gmail.com
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Aug 05 07:15:14 2020 +0000
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+/* SIGNAL USAGES IN RTOS 
+What is Signal ?  - Answer : Remember these five points
+
+1) Signals are different from all the other types of kernel object in that they are not autonomous (user need to control or set - No automatioc control like semaphore)
+2) signals are associated with tasks/Threads and have no independent existence. 
+3) If signals are configured for an application, each task has a set of eight signal flags.
+
+4) Any task can set the signals of another task. Only the owner task can read the signals. 
+5) The read is destructive – i.e. the signals are cleared by the process of reading. No other task can read or clear a task’s signals.
+
+
+In below example there are two threads 1)main thread and 2)Thread that is connected with onBoard_led functions
+We set the signal from main thread ,  second thread received the signal and toggle the led state.
+
+Program name : LED BLINKING USING RTOS SIGNAL
+PLATFORM : STM NUCLEO 64 L476
+Created by : jaydeep shah
+email : radhey04ec@gmail.com
+*/
+
+/* NOTE : WE ARE GOING TO USE EVENT FLAG CLASS METHOD The EventFlags class is used to control event flags or wait for event flags other threads control.
+*/
+#include "mbed.h"
+#include "rtos.h"
+ 
+DigitalOut led(LED2);  //ON BOARD LED
+ 
+EventFlags event_flags;  // EVESNT FLAG OBJECT CREATED (DOMAIN : SIGNAL)
+
+//TASK which is related to signal 
+void onBoard_led() {
+    uint32_t read = 0;
+    while (true) {
+        // Signal flags that are reported as event are automatically cleared -Autonomous object of Kernal
+        
+        read = event_flags.wait_any(0x1 | 0x2);
+        if(read == 0x1)
+        {
+        led = !led;  //Toggle state
+        }
+        printf("\n Received this flag event 0x%08lx \n\r",read);
+        
+    }
+}
+ 
+int main (void) {
+    Thread thread;  //create threaed
+ 
+    thread.start(callback(onBoard_led));  //Thread start
+ 
+    while (true) {
+        ThisThread::sleep_for(1000); //sleep for 1 sec
+        event_flags.set(0x1);  //set the signal for thread task from main thread  --LED BLINK TASK
+        ThisThread::sleep_for(1000);
+        event_flags.set(0x2); //This signal for print the statement -- use serial terminal
+    }
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Wed Aug 05 07:15:14 2020 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#cf4f12a123c05fcae83fc56d76442015cb8a39e9

Binary file resources/official_armmbed_example_badge.png has changed