Ryo Od
/
Nucleo_sinewave_output
AnalogOut Test
main.cpp@1:28154deb13f1, 2017-07-10 (annotated)
- Committer:
- ryood
- Date:
- Mon Jul 10 03:07:22 2017 +0000
- Revision:
- 1:28154deb13f1
- Parent:
- 0:08b1f4a462c7
- Child:
- 2:bc6bbf995c46
output 3ch
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ryood | 0:08b1f4a462c7 | 1 | #include "mbed.h" |
ryood | 0:08b1f4a462c7 | 2 | |
ryood | 1:28154deb13f1 | 3 | AnalogOut my_output1(A5); |
ryood | 1:28154deb13f1 | 4 | AnalogOut my_output2(A4); |
ryood | 1:28154deb13f1 | 5 | AnalogOut my_output3(A3); |
ryood | 0:08b1f4a462c7 | 6 | |
ryood | 0:08b1f4a462c7 | 7 | #define PI (3.141592653589793238462) |
ryood | 0:08b1f4a462c7 | 8 | #define AMPLITUDE (1.0) // x * 3.3V |
ryood | 0:08b1f4a462c7 | 9 | #define PHASE (PI * 1) // 2*pi is one period |
ryood | 0:08b1f4a462c7 | 10 | #define RANGE (0x7FFF) |
ryood | 0:08b1f4a462c7 | 11 | #define OFFSET (0x7FFF) |
ryood | 0:08b1f4a462c7 | 12 | |
ryood | 1:28154deb13f1 | 13 | // Configuration for wave output |
ryood | 0:08b1f4a462c7 | 14 | #define BUFFER_SIZE (360) |
ryood | 1:28154deb13f1 | 15 | uint16_t buffer_sine[BUFFER_SIZE]; |
ryood | 1:28154deb13f1 | 16 | uint16_t buffer_cosine[BUFFER_SIZE]; |
ryood | 1:28154deb13f1 | 17 | uint16_t buffer_saw[BUFFER_SIZE]; |
ryood | 0:08b1f4a462c7 | 18 | |
ryood | 0:08b1f4a462c7 | 19 | void calculate_sinewave(void); |
ryood | 1:28154deb13f1 | 20 | void calculate_cosinewave(void); |
ryood | 1:28154deb13f1 | 21 | void calculate_sawwave(void); |
ryood | 0:08b1f4a462c7 | 22 | |
ryood | 0:08b1f4a462c7 | 23 | int main() { |
ryood | 1:28154deb13f1 | 24 | printf("Multi-channel DAC example\n"); |
ryood | 0:08b1f4a462c7 | 25 | calculate_sinewave(); |
ryood | 1:28154deb13f1 | 26 | calculate_cosinewave(); |
ryood | 1:28154deb13f1 | 27 | calculate_sawwave(); |
ryood | 0:08b1f4a462c7 | 28 | while(1) { |
ryood | 1:28154deb13f1 | 29 | // wave output |
ryood | 0:08b1f4a462c7 | 30 | for (int i = 0; i < BUFFER_SIZE; i++) { |
ryood | 1:28154deb13f1 | 31 | my_output1.write_u16(buffer_sine[i]); |
ryood | 1:28154deb13f1 | 32 | my_output2.write_u16(buffer_cosine[i]); |
ryood | 1:28154deb13f1 | 33 | my_output3.write_u16(buffer_saw[i]); |
ryood | 0:08b1f4a462c7 | 34 | } |
ryood | 0:08b1f4a462c7 | 35 | } |
ryood | 0:08b1f4a462c7 | 36 | } |
ryood | 0:08b1f4a462c7 | 37 | |
ryood | 1:28154deb13f1 | 38 | // Create the wave buffer |
ryood | 0:08b1f4a462c7 | 39 | void calculate_sinewave(void){ |
ryood | 0:08b1f4a462c7 | 40 | for (int i = 0; i < BUFFER_SIZE; i++) { |
ryood | 0:08b1f4a462c7 | 41 | double rads = (PI * i)/180.0; // Convert degree in radian |
ryood | 1:28154deb13f1 | 42 | buffer_sine[i] = (uint16_t)(AMPLITUDE * (RANGE * (sin(rads + PHASE))) + OFFSET); |
ryood | 0:08b1f4a462c7 | 43 | } |
ryood | 0:08b1f4a462c7 | 44 | } |
ryood | 1:28154deb13f1 | 45 | |
ryood | 1:28154deb13f1 | 46 | void calculate_cosinewave(void) { |
ryood | 1:28154deb13f1 | 47 | for (int i = 0; i < BUFFER_SIZE; i++) { |
ryood | 1:28154deb13f1 | 48 | double rads = (PI * i)/180.0; // Convert degree in radian |
ryood | 1:28154deb13f1 | 49 | buffer_cosine[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET); |
ryood | 1:28154deb13f1 | 50 | } |
ryood | 1:28154deb13f1 | 51 | } |
ryood | 1:28154deb13f1 | 52 | |
ryood | 1:28154deb13f1 | 53 | void calculate_sawwave(void) { |
ryood | 1:28154deb13f1 | 54 | for (int i = 0; i < BUFFER_SIZE; i++) { |
ryood | 1:28154deb13f1 | 55 | buffer_saw[i] = i * 0xFFFF / BUFFER_SIZE; |
ryood | 1:28154deb13f1 | 56 | } |
ryood | 1:28154deb13f1 | 57 | } |