Ryo Od
/
Nucleo_sinewave_output
AnalogOut Test
Diff: main.cpp
- Revision:
- 0:08b1f4a462c7
- Child:
- 1:28154deb13f1
diff -r 000000000000 -r 08b1f4a462c7 main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Tue Jun 13 21:43:24 2017 +0000 @@ -0,0 +1,38 @@ +#include "mbed.h" + +AnalogOut my_output1(PA_4); +//AnalogOut my_output2(PA_5); +//AnalogOut my_output3(PA_6); + +#define PI (3.141592653589793238462) +#define AMPLITUDE (1.0) // x * 3.3V +#define PHASE (PI * 1) // 2*pi is one period +#define RANGE (0x7FFF) +#define OFFSET (0x7FFF) + +// Configuration for sinewave output +#define BUFFER_SIZE (360) +uint16_t buffer[BUFFER_SIZE]; + +void calculate_sinewave(void); + +int main() { + printf("Sinewave example\n"); + calculate_sinewave(); + while(1) { + // sinewave output + for (int i = 0; i < BUFFER_SIZE; i++) { + my_output1.write_u16(buffer[i]); + //my_output2.write_u16(buffer[i]); + //my_output3.write_u16(buffer[i]); + } + } +} + +// Create the sinewave buffer +void calculate_sinewave(void){ + for (int i = 0; i < BUFFER_SIZE; i++) { + double rads = (PI * i)/180.0; // Convert degree in radian + buffer[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET); + } +}