Diff: main.cpp

Revision:

1:4d067c712d03

Parent:

0:5bd42710f2e7

Child:

2:daaf6b6ad568

--- a/main.cpp	Thu Sep 03 00:06:32 2015 +0000
+++ b/main.cpp	Thu Sep 03 22:11:03 2015 +0000
@@ -8,29 +8,99 @@
 
 Serial serialIO(SERIAL_TX, SERIAL_RX);
 
-DigitalOut led1(LED1);
 DigitalOut led2(LED2);
+DigitalIn button(USER_BUTTON);
+
+// Some data queue
+typedef struct {
+    float    voltage;   /* AD result of measured voltage */
+    uint32_t counter;   /* A counter value               */
+} message_t;
+
+MemoryPool<message_t, 16> mpool;
+Queue<message_t, 16> queue;
+
+// Mutex shared by threads that want's to use the serial port
+Mutex stdio_mutex;
+
+void led_thread(void const *args)
+{
+    while (true) {
+        // Toogle led
+        led2 = !led2;
+
+        // To avoid using the serial port at the same time by two threads use the mutex
+        stdio_mutex.lock();
+        serialIO.printf("Toogle led2 from thread1 !\r\n");
+        stdio_mutex.unlock();
+
+        // Put thread in wait state for 500ms
+        Thread::wait(500);
+    }
+}
+
+void check_button(void const *args)
+{
+    while (true) {
+        // Read button
+        int butVal = button;
 
-void led2_thread(void const *args) {
+        // To avoid using the serial port at the same time by two threads use the mutex
+        stdio_mutex.lock();
+        serialIO.printf("Button state is:%d\r\n",butVal);
+        stdio_mutex.unlock();
+
+        // Put thread in wait state for 100ms
+        Thread::wait(100);
+    }
+}
+
+void data_producer(void const *args)
+{
+    uint32_t i = 0;
     while (true) {
-        led2 = !led2;
-        Thread::wait(800);
+        i++; // fake data update
+        message_t *message = mpool.alloc();
+        message->voltage = (i * 0.1) * 33;
+        message->counter = i;
+        queue.put(message);
+        Thread::wait(100);
+    }
+}
+
+void data_consumer(void const *args)
+{
+    while(true) {
+        // Block until there is an event on the queue
+        osEvent evt = queue.get();
+        if (evt.status == osEventMessage) {
+            message_t *message = (message_t*)evt.value.p;
+            
+            // Grab mutex to print data
+            stdio_mutex.lock();
+            serialIO.printf("\nVoltage: %.2f V\n\r"   , message->voltage);
+            serialIO.printf("Number of cycles: %u\n\r", message->counter);
+            stdio_mutex.unlock();
+
+            mpool.free(message);
+        }
     }
 }
 
 int main()
-{
-    int i = 1;
+{    
     // Configure the serial speed.
     serialIO.baud(115200);
-    serialIO.printf("Learning Microcontrollers with mbed !\n");
-    
+    serialIO.printf("Learning Microcontrollers with mbed !\r\n");
+
     // Start a thread to togle the led
-    Thread thread(led2_thread);
+    Thread thread_1(led_thread);
+    Thread thread_2(check_button);
+    Thread thread_3(data_producer);
+    Thread thread_4(data_consumer);
+
     // Lock forever here...
     while(1) {
-        wait(1);
-        serialIO.printf("This program runs since %d seconds.\n", i++);
-        led1 = !led1;
+
     }
 }