Ryo Od
/
Nucleo_sinewave_output
AnalogOut Test
Diff: main.cpp
- Revision:
- 1:28154deb13f1
- Parent:
- 0:08b1f4a462c7
- Child:
- 2:bc6bbf995c46
--- a/main.cpp Tue Jun 13 21:43:24 2017 +0000 +++ b/main.cpp Mon Jul 10 03:07:22 2017 +0000 @@ -1,8 +1,8 @@ #include "mbed.h" -AnalogOut my_output1(PA_4); -//AnalogOut my_output2(PA_5); -//AnalogOut my_output3(PA_6); +AnalogOut my_output1(A5); +AnalogOut my_output2(A4); +AnalogOut my_output3(A3); #define PI (3.141592653589793238462) #define AMPLITUDE (1.0) // x * 3.3V @@ -10,29 +10,48 @@ #define RANGE (0x7FFF) #define OFFSET (0x7FFF) -// Configuration for sinewave output +// Configuration for wave output #define BUFFER_SIZE (360) -uint16_t buffer[BUFFER_SIZE]; +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("Sinewave example\n"); + printf("Multi-channel DAC example\n"); calculate_sinewave(); + calculate_cosinewave(); + calculate_sawwave(); while(1) { - // sinewave output + // wave 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]); + my_output1.write_u16(buffer_sine[i]); + my_output2.write_u16(buffer_cosine[i]); + my_output3.write_u16(buffer_saw[i]); } } } -// Create the sinewave buffer +// 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[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET); + 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; + } +}