Nathan Yonkee
/
Nucleo_sinewave_output_copy
init
main.cpp
- Committer:
- bcostm
- Date:
- 2014-09-30
- Revision:
- 3:f4b02d11940b
- Parent:
- 1:7eaa2a1e9e17
- Child:
- 4:6a66cf97f2cf
File content as of revision 3:f4b02d11940b:
#include "mbed.h" AnalogOut my_output(PA_4); #define PI (3.141592653589793238462) #define AMPLITUDE (1.0) // x * 3.3V #define PHASE (PI * 1) // 2*pi is one period #define RANGE (4096/2) // 12 bits DAC #define OFFSET (4096/2) // 12 bits DAC // Configuration for sinewave output #define BUFFER_SIZE (360) uint16_t buffer[BUFFER_SIZE]; void calculate_sinewave(void); int main() { 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); } }