Ryo Od
/
Nucleo_sinewave_output
AnalogOut Test
main.cpp
- Committer:
- ryood
- Date:
- 2017-11-21
- Revision:
- 2:bc6bbf995c46
- Parent:
- 1:28154deb13f1
File content as of revision 2:bc6bbf995c46:
#include "mbed.h" /* // Nucleo F303 AnalogOut my_output1(A5); AnalogOut my_output2(A4); AnalogOut my_output3(A3); */ // Nucleo F446/F767 AnalogOut my_output1(PA_4); AnalogOut my_output2(PA_5); #define PI (3.141592653589793238462) #define AMPLITUDE (0.8) // x * 3.3V #define PHASE (PI * 1) // 2*pi is one period #define RANGE (0x7FFF) #define OFFSET (0x7FFF) // Configuration for wave output #define BUFFER_SIZE (360) uint16_t buffer_sine[BUFFER_SIZE]; uint16_t buffer_cosine[BUFFER_SIZE]; uint16_t buffer_saw[BUFFER_SIZE]; void calculate_sinewave(void); void calculate_cosinewave(void); void calculate_sawwave(void); int main() { printf("Multi-channel DAC example\n"); calculate_sinewave(); calculate_cosinewave(); calculate_sawwave(); while(1) { // wave output for (int i = 0; i < BUFFER_SIZE; i++) { my_output1.write_u16(buffer_sine[i]); my_output2.write_u16(buffer_cosine[i]); //my_output3.write_u16(buffer_saw[i]); } } } // Create the wave buffer void calculate_sinewave(void){ for (int i = 0; i < BUFFER_SIZE; i++) { double rads = (PI * i)/180.0; // Convert degree in radian buffer_sine[i] = (uint16_t)(AMPLITUDE * (RANGE * (sin(rads + PHASE))) + OFFSET); } } void calculate_cosinewave(void) { for (int i = 0; i < BUFFER_SIZE; i++) { double rads = (PI * i)/180.0; // Convert degree in radian buffer_cosine[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET); } } void calculate_sawwave(void) { for (int i = 0; i < BUFFER_SIZE; i++) { buffer_saw[i] = i * 0xFFFF / BUFFER_SIZE; } }