ST / Mbed OS mbed-os-example-NFC01A1

A simple mbed OS application providing an example of asynchronous access to the X-NUCLEO_NFC01A1 Dynamic NFC Tag board.

Dependencies:   NDefLib X_NUCLEO_NFC01A1

Fork of mbed-os-example-NFC01A1 by Nicola Capovilla

The application provides a simple example of asynchronous access to the X-NUCLEO-NFC01A1 Dynamic NFC Tag Expansion Board. It represents the multi-threaded mbed OS 5 version of the mbed classic HelloWorld_Async_NFC01A1 application.
The program writes a URI link to the M24SR dynamic tag using the asynchronous programming model. The URI can then be read and printed on the serial console by pressing the user button and/or via RF from an NFC enabled smartphone/tablet.

Diff: main.cpp

Revision:
2:e06d881b4b3c
Parent:
1:951cd8fbff34
--- a/main.cpp	Fri Aug 11 07:58:12 2017 +0000
+++ b/main.cpp	Fri Aug 11 09:19:31 2017 +0000
@@ -39,8 +39,7 @@
 #include "NDefNfcTagM24SR.h"
 #include "NDefLib/RecordType/RecordURI.h"
 
-Thread nfcReadThread;
-Thread nfcEventsThread;
+Thread thread;
 
 /** flag to signal an interrupt from the nfc component*/
 #define NFC_INTERRUPT_FLAG    0x1
@@ -55,40 +54,28 @@
  
 /** Nfc ISR called when the nfc component has a message ready*/
 static void nfc_interrupt_callback() {
-    nfcEventsThread.signal_set(NFC_INTERRUPT_FLAG);
+    thread.signal_set(NFC_INTERRUPT_FLAG);
 }//nfcInterruptCallback
  
 /** ISR handling button pressure **/ 
 static void set_button_press() {
-    nfcReadThread.signal_set(BUTTON_PRESSED_FLAG);    
+    thread.signal_set(BUTTON_PRESSED_FLAG);    
 }//buttonPressed event
 
 
-void nfcEvents() {
-    while (true) {
-        osEvent event = nfcEventsThread.signal_wait(NFC_INTERRUPT_FLAG); // wait for nfc event
-        //printf("Got an NFC event!\n\r");  
-        nfcNucleo->get_M24SR().manage_event();
-    }
-}
-
-void readNfc() {
-    
+void handleEvents() {
     //create the callback to read a tag
     ReadUriCallbacks NDefReadCallback(nfcNucleo->get_led1(),nfcNucleo->get_led2(),nfcNucleo->get_led3());
-    //create the callback to write a tag
-    WriteUriCallbacks NDefWriteCallback(nfcNucleo->get_led1(),nfcNucleo->get_led2(),nfcNucleo->get_led3());
-    // write the tag
-    printf("Writing Tag\n\r");
-    tag->open_session();
-    
     while (true) {
-        osEvent event = nfcReadThread.signal_wait(BUTTON_PRESSED_FLAG); // wait for button pressed
-        printf("Button pressed! Reading the Tag.\n\r");
-        tag->set_callback(&NDefReadCallback);
-        tag->open_session();
+        osEvent event = thread.signal_wait(0); // wait for any event
+        if (event.value.v == NFC_INTERRUPT_FLAG) {
+            nfcNucleo->get_M24SR().manage_event();
+        } else if (event.value.v == BUTTON_PRESSED_FLAG) {
+            printf("Button pressed! Reading the Tag.\n\r");
+            tag->set_callback(&NDefReadCallback);
+            tag->open_session();
+        }
     }
-
 }
  
 int main() {
@@ -113,10 +100,15 @@
     tag = &(nfcNucleo->get_M24SR().get_NDef_tag());
     printf("System Init done!\n\r");
     
-     //Start the nfc event handling thread
-    nfcEventsThread.start(nfcEvents);
-    //Start the nfc reading thread - also writes the tag once
-    nfcReadThread.start(readNfc);
+     //Start the event handling thread
+    thread.start(handleEvents);
+    
+    //create the callback to write a tag
+    WriteUriCallbacks NDefWriteCallback(nfcNucleo->get_led1(),nfcNucleo->get_led2(),nfcNucleo->get_led3());
+    // write the tag
+    tag->set_callback(&NDefWriteCallback); //set the callback
+    printf("Writing Tag\n\r");
+    tag->open_session();
       
     while (true) {
         __WFE();