Istvan Cserny
RTOS application with 3 threads of different priorities: play music, measure temperature (and print results via stdio) and plays with the MMA8451Q sensor and the RGB LEDs
Dependencies: MMA8451Q mbed-rtos mbed
Revision 0:d3948113d6d9, committed 2016-01-28
- Comitter:
- icserny
- Date:
- Thu Jan 28 15:26:56 2016 +0000
- Commit message:
- First version
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MMA8451Q.lib Thu Jan 28 15:26:56 2016 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/emilmont/code/MMA8451Q/#c4d879a39775
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Jan 28 15:26:56 2016 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+#include "rtos.h"
+#include "MMA8451Q.h"
+
+MMA8451Q acc(PTE25,PTE24,0x3A); //SDA, SCL, I2C address lef shifted
+PwmOut rled(LED_RED); //configure RGB LED pins as PWM outputs
+PwmOut gled(LED_GREEN);
+PwmOut bled(LED_BLUE);
+PwmOut buzzer(D3); //used to play music
+
+float frequency[]= {659,554,659,554,550,494,554,587,494,659,554,440}; //frequency array
+uint8_t beat[]= {2,2,2,2,2,1,1,2,2,2,2,4}; //beat array
+
+void music(void const *args)
+{
+ while (1) {
+ for (int i=0; i<12; i++) {
+ buzzer.period(1/frequency[i]); // set PWM period
+ buzzer=0.5; // set duty cycle
+ Thread::wait(250*beat[i]); // hold for beat period
+ }
+ }
+}
+
+void thermometer(void const *args)
+{
+ AnalogIn ain(A0); // Analog input at PTB0
+ uint32_t mysum; // Used for summation
+
+ printf("\r\nTask3: analog thermometer - with averaging\r\n");
+ while(1) {
+ mysum = 0;
+ for(int i=0; i<3300; i++) {
+ mysum += ain.read_u16(); // sum up raw 16-bit data
+ }
+ float voltage = mysum>>16; // voltage in millivolts
+ float tempC = (voltage -500)/10; // tempereature in Celsius
+ printf("voltage: %5.0f mV temp: %5.1f C\r\n",voltage,tempC);
+ Thread::wait(2000);
+ }
+}
+
+
+int main(void)
+{
+ Thread thread2(music); //Define a new task
+ thread2.set_priority(osPriorityHigh); //Give it high priority
+
+ Thread thread3(thermometer); //Define another new task
+ thread3.set_priority(osPriorityLow); //Give it high priority
+
+ while (true) { //Run the default task
+ float x, y, z;
+ x = abs(acc.getAccX()); //Read X component of acceleration
+ y = abs(acc.getAccY()); //Read Y component of acceleration
+ z = abs(acc.getAccZ()); //Read Z component of acceleration
+ rled = 1.0f - x; //Negative logic is used as the LEDs
+ gled = 1.0f - y; //are of common anode type...
+ bled = 1.0f - z;
+ Thread::wait(100); //Time period is ~ 100 ms
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Thu Jan 28 15:26:56 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-rtos/#3d9d2b8b8f17
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Jan 28 15:26:56 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/6f327212ef96 \ No newline at end of file