Embedded systems project
Dependencies: LCD_DISCO_F429ZI mbed BSP_DISCO_F429ZI
main.cpp@1:37130d7a175f, 2018-12-14 (annotated)
- Committer:
- brianwei
- Date:
- Fri Dec 14 21:22:01 2018 +0000
- Revision:
- 1:37130d7a175f
- Parent:
- 0:0fa4ebf14d9c
- Child:
- 2:1d2abc38bae1
fixed sawtooth
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
brianwei | 0:0fa4ebf14d9c | 1 | #include "mbed.h" |
brianwei | 0:0fa4ebf14d9c | 2 | #include "LCD_DISCO_F429ZI.h" |
brianwei | 0:0fa4ebf14d9c | 3 | |
brianwei | 0:0fa4ebf14d9c | 4 | AnalogOut pinout(PA_4); |
brianwei | 0:0fa4ebf14d9c | 5 | LCD_DISCO_F429ZI lcd; |
brianwei | 0:0fa4ebf14d9c | 6 | |
brianwei | 0:0fa4ebf14d9c | 7 | #define PI (3.141592653589793238462) |
brianwei | 0:0fa4ebf14d9c | 8 | #define AMPLITUDE (1.0) // x * 3.3V |
brianwei | 0:0fa4ebf14d9c | 9 | #define PHASE (PI * 1) // 2*pi is one period |
brianwei | 0:0fa4ebf14d9c | 10 | #define RANGE (0x7FFF) |
brianwei | 0:0fa4ebf14d9c | 11 | #define OFFSET (0x7FFF) |
brianwei | 0:0fa4ebf14d9c | 12 | |
brianwei | 0:0fa4ebf14d9c | 13 | #define PERIOD (70000) |
brianwei | 0:0fa4ebf14d9c | 14 | |
brianwei | 0:0fa4ebf14d9c | 15 | // Configuration for sinewave output |
brianwei | 0:0fa4ebf14d9c | 16 | #define BUFFER_SIZE (360) |
brianwei | 0:0fa4ebf14d9c | 17 | uint16_t buffer[BUFFER_SIZE]; |
brianwei | 0:0fa4ebf14d9c | 18 | uint8_t text[30]; |
brianwei | 0:0fa4ebf14d9c | 19 | int x = 0; |
brianwei | 1:37130d7a175f | 20 | int i; |
brianwei | 0:0fa4ebf14d9c | 21 | |
brianwei | 0:0fa4ebf14d9c | 22 | InterruptIn user_button(USER_BUTTON); |
brianwei | 0:0fa4ebf14d9c | 23 | |
brianwei | 0:0fa4ebf14d9c | 24 | void button_pressed(){ |
brianwei | 0:0fa4ebf14d9c | 25 | x = (x+1)%4; |
brianwei | 0:0fa4ebf14d9c | 26 | } |
brianwei | 0:0fa4ebf14d9c | 27 | |
brianwei | 0:0fa4ebf14d9c | 28 | void calculate_sinewave(void); |
brianwei | 0:0fa4ebf14d9c | 29 | |
brianwei | 0:0fa4ebf14d9c | 30 | int main() { |
brianwei | 0:0fa4ebf14d9c | 31 | calculate_sinewave(); |
brianwei | 0:0fa4ebf14d9c | 32 | while(1) { |
brianwei | 0:0fa4ebf14d9c | 33 | user_button.rise(&button_pressed); |
brianwei | 0:0fa4ebf14d9c | 34 | switch(x){ |
brianwei | 0:0fa4ebf14d9c | 35 | // sinewave output |
brianwei | 0:0fa4ebf14d9c | 36 | case 0: |
brianwei | 1:37130d7a175f | 37 | for (i = 0; i < BUFFER_SIZE; i++) { |
brianwei | 0:0fa4ebf14d9c | 38 | pinout.write_u16(buffer[i]); |
brianwei | 0:0fa4ebf14d9c | 39 | } |
brianwei | 0:0fa4ebf14d9c | 40 | break; |
brianwei | 0:0fa4ebf14d9c | 41 | |
brianwei | 0:0fa4ebf14d9c | 42 | // triangle output |
brianwei | 0:0fa4ebf14d9c | 43 | case 1: |
brianwei | 1:37130d7a175f | 44 | for (i = 0; i < PERIOD/2; i++) { |
brianwei | 0:0fa4ebf14d9c | 45 | pinout.write_u16(i); |
brianwei | 0:0fa4ebf14d9c | 46 | } |
brianwei | 0:0fa4ebf14d9c | 47 | |
brianwei | 1:37130d7a175f | 48 | for (i = PERIOD/2; i>0; i--) { |
brianwei | 0:0fa4ebf14d9c | 49 | pinout.write_u16(i); |
brianwei | 0:0fa4ebf14d9c | 50 | } |
brianwei | 0:0fa4ebf14d9c | 51 | break; |
brianwei | 0:0fa4ebf14d9c | 52 | |
brianwei | 0:0fa4ebf14d9c | 53 | //square output |
brianwei | 0:0fa4ebf14d9c | 54 | case 2: |
brianwei | 1:37130d7a175f | 55 | for (i = 0; i < PERIOD/2; i++) { |
brianwei | 0:0fa4ebf14d9c | 56 | pinout.write_u16(0); |
brianwei | 0:0fa4ebf14d9c | 57 | } |
brianwei | 0:0fa4ebf14d9c | 58 | |
brianwei | 1:37130d7a175f | 59 | for (i = PERIOD/2; i>0; i--) { |
brianwei | 0:0fa4ebf14d9c | 60 | pinout.write_u16((uint16_t)(AMPLITUDE*RANGE+OFFSET)); |
brianwei | 0:0fa4ebf14d9c | 61 | } |
brianwei | 0:0fa4ebf14d9c | 62 | break; |
brianwei | 0:0fa4ebf14d9c | 63 | |
brianwei | 0:0fa4ebf14d9c | 64 | case 3: |
brianwei | 0:0fa4ebf14d9c | 65 | //sawtooth output |
brianwei | 1:37130d7a175f | 66 | for (i = 0; i < PERIOD; i++) { |
brianwei | 0:0fa4ebf14d9c | 67 | pinout.write_u16(i); |
brianwei | 0:0fa4ebf14d9c | 68 | } |
brianwei | 0:0fa4ebf14d9c | 69 | break; |
brianwei | 0:0fa4ebf14d9c | 70 | |
brianwei | 0:0fa4ebf14d9c | 71 | default: |
brianwei | 0:0fa4ebf14d9c | 72 | lcd.DisplayStringAt(0, LINE(1), (uint8_t *)"Signal Generator", CENTER_MODE); |
brianwei | 0:0fa4ebf14d9c | 73 | } |
brianwei | 0:0fa4ebf14d9c | 74 | } |
brianwei | 0:0fa4ebf14d9c | 75 | } |
brianwei | 0:0fa4ebf14d9c | 76 | |
brianwei | 0:0fa4ebf14d9c | 77 | // Create the sinewave buffer |
brianwei | 0:0fa4ebf14d9c | 78 | void calculate_sinewave(void){ |
brianwei | 0:0fa4ebf14d9c | 79 | for (int i = 0; i < BUFFER_SIZE; i++) { |
brianwei | 0:0fa4ebf14d9c | 80 | double rads = (PI * i)/180.0; // Convert degree in radian |
brianwei | 0:0fa4ebf14d9c | 81 | buffer[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET); |
brianwei | 0:0fa4ebf14d9c | 82 | } |
brianwei | 0:0fa4ebf14d9c | 83 | } |