Ryo Od
/
Nucleo_sinewave_output
AnalogOut Test
main.cpp@0:08b1f4a462c7, 2017-06-13 (annotated)
- Committer:
- ryood
- Date:
- Tue Jun 13 21:43:24 2017 +0000
- Revision:
- 0:08b1f4a462c7
- Child:
- 1:28154deb13f1
first commit
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 | 0:08b1f4a462c7 | 3 | AnalogOut my_output1(PA_4); |
ryood | 0:08b1f4a462c7 | 4 | //AnalogOut my_output2(PA_5); |
ryood | 0:08b1f4a462c7 | 5 | //AnalogOut my_output3(PA_6); |
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 | 0:08b1f4a462c7 | 13 | // Configuration for sinewave output |
ryood | 0:08b1f4a462c7 | 14 | #define BUFFER_SIZE (360) |
ryood | 0:08b1f4a462c7 | 15 | uint16_t buffer[BUFFER_SIZE]; |
ryood | 0:08b1f4a462c7 | 16 | |
ryood | 0:08b1f4a462c7 | 17 | void calculate_sinewave(void); |
ryood | 0:08b1f4a462c7 | 18 | |
ryood | 0:08b1f4a462c7 | 19 | int main() { |
ryood | 0:08b1f4a462c7 | 20 | printf("Sinewave example\n"); |
ryood | 0:08b1f4a462c7 | 21 | calculate_sinewave(); |
ryood | 0:08b1f4a462c7 | 22 | while(1) { |
ryood | 0:08b1f4a462c7 | 23 | // sinewave output |
ryood | 0:08b1f4a462c7 | 24 | for (int i = 0; i < BUFFER_SIZE; i++) { |
ryood | 0:08b1f4a462c7 | 25 | my_output1.write_u16(buffer[i]); |
ryood | 0:08b1f4a462c7 | 26 | //my_output2.write_u16(buffer[i]); |
ryood | 0:08b1f4a462c7 | 27 | //my_output3.write_u16(buffer[i]); |
ryood | 0:08b1f4a462c7 | 28 | } |
ryood | 0:08b1f4a462c7 | 29 | } |
ryood | 0:08b1f4a462c7 | 30 | } |
ryood | 0:08b1f4a462c7 | 31 | |
ryood | 0:08b1f4a462c7 | 32 | // Create the sinewave buffer |
ryood | 0:08b1f4a462c7 | 33 | void calculate_sinewave(void){ |
ryood | 0:08b1f4a462c7 | 34 | for (int i = 0; i < BUFFER_SIZE; i++) { |
ryood | 0:08b1f4a462c7 | 35 | double rads = (PI * i)/180.0; // Convert degree in radian |
ryood | 0:08b1f4a462c7 | 36 | buffer[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET); |
ryood | 0:08b1f4a462c7 | 37 | } |
ryood | 0:08b1f4a462c7 | 38 | } |