mbed-os-examples / Mbed OS mbed-os-example-mbed5-blinky Featured

This is a very simple guide, reviewing the steps required to get Blinky working on an Mbed OS platform.

Mbed OS Blinky

This example shows the use of a DigitalOut object to represent an LED and use of the nonblocking Thread::wait() call. Using nonblocking calls is good practice because Mbed OS can schedule and run other threads while the first thread is waiting.

Building this example

Building with Arm Mbed CLI

To use Mbed CLI to build this example, follow the instructions in the documentation. The instructions here relate to using the Arm Online Compiler.

To use the Online Compiler, import this code into the Online Compiler, and select your platform from the top right. Compile the code using the compile button, load it onto your board and press the reset button on the board. The code will run on the board, and you will see the LED blink.

You can find more instructions for using the Mbed Online Compiler in the documentation.

Diff: main.cpp

Revision:
102:6979ad8bc0bc
Parent:
100:ec006d6f3cb6
Child:
104:f2805e857b14
--- a/main.cpp	Wed Oct 23 18:00:04 2019 +0100
+++ b/main.cpp	Mon Nov 04 16:00:04 2019 +0000
@@ -1,33 +1,23 @@
 /* mbed Microcontroller Library
- * Copyright (c) 2018 ARM Limited
+ * Copyright (c) 2019 ARM Limited
  * SPDX-License-Identifier: Apache-2.0
  */
 
 #include "mbed.h"
 #include "platform/mbed_thread.h"
-#include "stats_report.h"
 
-DigitalOut led1(LED1);
 
-#define SLEEP_TIME                  500 // (msec)
-#define PRINT_AFTER_N_LOOPS         20
+// Blinking rate in milliseconds
+#define BLINKING_RATE_MS                                                    500
 
-// main() runs in its own thread in the OS
+
 int main()
 {
-    SystemReport sys_state( SLEEP_TIME * PRINT_AFTER_N_LOOPS /* Loop delay time in ms */);
+    // Initialise the digital pin LED1 as an output
+    DigitalOut led(LED1);
 
-    int count = 0;
     while (true) {
-        // Blink LED and wait 0.5 seconds
-        led1 = !led1;
-        thread_sleep_for(SLEEP_TIME);
-
-        if ((0 == count) || (PRINT_AFTER_N_LOOPS == count)) {
-            // Following the main thread wait, report on the current system status
-            sys_state.report_state();
-            count = 0;
-        }
-        ++count;
+        led = !led;
+        thread_sleep_for(BLINKING_RATE_MS);
     }
 }