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Lab 3 where the sine wave command is created.
Diff: main.cpp
- Revision:
- 0:9b9ec8ebd3e2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Jan 22 23:08:18 2018 +0000 @@ -0,0 +1,39 @@ +#include "mbed.h" + +#if !DEVICE_ANALOGOUT +#error You cannot use this example as the AnalogOut is not supported on this device. +#else +AnalogOut my_output(PA_4); +#endif + +#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_output.write_u16(buffer[i]); + wait_us(10); + } + } +} + +// 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); + } +}