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

Files at this revision

API Documentation at this revision

Revision 0:e003548e7f74, committed 2020-07-12

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

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+.build
+.mbed
+projectfiles
+*.py*

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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).

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+![](./resources/official_armmbed_example_badge.png)
+# Blinky Mbed OS example
+
+The example project is part of the [Arm Mbed OS Official Examples](https://os.mbed.com/code/) and is the [getting started example for Mbed OS](https://os.mbed.com/docs/mbed-os/v5.14/quick-start/index.html). It contains an application that repeatedly blinks an LED on supported [Mbed boards](https://os.mbed.com/platforms/).
+
+You can build the project with all supported [Mbed OS build tools](https://os.mbed.com/docs/mbed-os/latest/tools/index.html). However, this example project specifically refers to the command-line interface tool [Arm Mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli).
+(Note: To see a rendered example you can import into the Arm Online Compiler, please see our [import quick start](https://os.mbed.com/docs/mbed-os/latest/quick-start/online-with-the-online-compiler.html#importing-the-code).)
+
+1. [Install Mbed CLI](https://os.mbed.com/docs/mbed-os/latest/quick-start/offline-with-mbed-cli.html).
+
+1. Clone this repository on your system, and change the current directory to where the project was cloned:
+
+    ```bash
+    $ git clone git@github.com:armmbed/mbed-os-example-blinky && cd mbed-os-example-blinky
+    ```
+
+    Alternatively, you can download the example project with Arm Mbed CLI using the `import` subcommand:
+
+    ```bash
+    $ mbed import mbed-os-example-blinky && cd mbed-os-example-blinky
+    ```
+
+
+## Application functionality
+
+The `main()` function is the single thread in the application. It toggles the state of a digital output connected to an LED on the board.
+
+## Building and running
+
+1. Connect a USB cable between the USB port on the board and the host computer.
+2. <a name="build_cmd"></a> Run the following command to build the example project and program the microcontroller flash memory:
+    ```bash
+    $ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash
+    ```
+The binary is located at `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-blinky.bin`.
+
+Alternatively, you can manually copy the binary to the board, which you mount on the host computer over USB.
+
+Depending on the target, you can build the example project with the `GCC_ARM`, `ARM` or `IAR` toolchain. After installing Arm Mbed CLI, run the command below to determine which toolchain supports your target:
+
+```bash
+$ mbed compile -S
+```
+
+## Expected output
+The LED on your target turns on and off every 500 milliseconds.
+
+
+## Troubleshooting
+If you have problems, you can review the [documentation](https://os.mbed.com/docs/latest/tutorials/debugging.html) for suggestions on what could be wrong and how to fix it.
+
+## Related Links
+
+* [Mbed OS Stats API](https://os.mbed.com/docs/latest/apis/mbed-statistics.html).
+* [Mbed OS Configuration](https://os.mbed.com/docs/latest/reference/configuration.html).
+* [Mbed OS Serial Communication](https://os.mbed.com/docs/latest/tutorials/serial-communication.html).
+* [Mbed OS bare metal](https://os.mbed.com/docs/mbed-os/latest/reference/mbed-os-bare-metal.html).
+* [Mbed boards](https://os.mbed.com/platforms/).
+
+### License and contributions
+
+The software is provided under Apache-2.0 license. Contributions to this project are accepted under the same license. Please see contributing.md for more info.
+
+This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide.

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+/*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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+https://github.com/ARMmbed/mbed-os/#cf4f12a123c05fcae83fc56d76442015cb8a39e9

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