Diff: main.cpp

Revision:

0:cdb3d484a242

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 08 14:15:15 2016 +0000
@@ -0,0 +1,63 @@
+/**
+ * Minor BioRobotics 2016
+ *
+ * Programming Homework Set 1
+ * Exercise 8, example solution
+ *
+ * M.E. Grootens [at] utwente.nl,
+ * v0.1, 08.09.2016
+ */
+
+#include "mbed.h"
+
+#define SERIAL_BAUD 115200  // baud rate for serial communication
+
+// Serial communication with PC
+Serial pc(USBTX,USBRX);
+
+// The LED that is to flash
+DigitalOut led(LED_RED);
+
+// Number of times to flash; global and volatile, 'cause modified by interrupt
+volatile int n_times = 0;
+
+/**
+ * Flash the LED
+ * @ensure n_times is increased and then the LED flashes n_times
+ */
+void FlashLed()
+{
+    n_times++;
+    
+    pc.printf("\r\nFlashing %d times:\r\n",n_times);
+    
+    for (int i=0; i<n_times; i++) {
+        pc.printf("[%d]",i);
+        
+        led.write(0);   // on
+        wait(0.1f);     // wait 0.1 s
+        led.write(1);   // off
+        wait(0.4f);     // wait 0.4 s
+    }
+}
+
+
+/**
+ * Main function.
+ */
+int main()
+{
+    // Serial communication
+    pc.baud(SERIAL_BAUD);
+    pc.printf("\r\n**BOARD RESET**\r\n");
+    
+    // LED off
+    led.write(1);
+    
+    // Interrupt; call FlashLed when button pressed
+    InterruptIn sw2(SW2);
+    sw2.fall(&FlashLed);
+    
+    // Infinite loop; does nothing but needs to prevent termination
+    while (true);
+}
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