Diff: main.cpp

Revision:

0:9ed9bcd7cc87

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 01 00:41:43 2019 +0000
@@ -0,0 +1,65 @@
+#include "mbed.h"
+#include "rtos.h"
+#include "SDBlockDevice.h"
+#include "FATFileSystem.h"
+#include "wave_player.h"
+
+// LED Components
+PwmOut led(LED1);
+
+// SD File System Components
+SDBlockDevice   sd(p5, p6, p7, p8);
+FATFileSystem   fs("sd");
+
+// Audio Components
+AnalogOut       dac(p18);
+PwmOut          speaker(p25);
+wave_player     wav(&dac, &speaker);
+
+Thread led_thread, audio_thread;
+
+void led_siren() {
+    const int build_time = 100;
+    while (1) {
+        //LED warm up effect using PWM
+        for(int i=0; i<build_time; i++) {
+            led = i / (float) build_time;
+            ThisThread::sleep_for(1000.0*0.02);
+        }
+        //LED at full brightness level
+        led = 1.0;
+        ThisThread::sleep_for(1000.0*0.25);
+        //LED cool down effect using PWM
+        for(int i=build_time-1; i>0; i--) {
+            led = i/ (float) build_time;
+            ThisThread::sleep_for(1000.0*0.02);
+        }
+        //LED off
+        led = 0.0;
+        ThisThread::sleep_for(1000.0*1.5);
+    }
+}
+
+void play_audio() {
+    FILE * wav_file;
+    speaker.period(1.0/1000000.0);
+    while (1) {
+        sd.init();
+        fs.mount(&sd);
+        wav_file = fopen("/sd/siren.wav", "r");
+        wav.play(wav_file);
+        fclose(wav_file);
+        sd.deinit();
+        fs.unmount();
+    }
+}
+
+// main() runs in its own thread in the OS
+int main()
+{   
+    led_thread.start(led_siren);
+    audio_thread.start(play_audio);
+    while (true) {
+        ThisThread::sleep_for(500);
+    }
+}