更新内容
1,增加触屏操作功能，所有操作直接通过触屏操作
2,硬件部分增加负电压采集功能。
3,探头提供x1,x10,x100三档衰减功能.
4,支持DC,AC藕合方式。
5,支持时基调。
6,增加HOLD功能。
演示：下图采集的正玄波为市电通过9V变压器降压后直接采样的波形。
有能力的朋友可以改进一下，最好能发份改进的源码给我。
电路原理图如下：
制作出来的实物图如下：
单片机源程序如下:
- #include <Adafruit_GFX.h>
- #include <MCUFRIEND_kbv.h>
- #include <TouchScreen.h>
- MCUFRIEND_kbv tft;
- const int XP=7,XM=A1,YP=A2,YM=6; //ID=0x5408
- const int TS_LEFT=772,TS_RT=151,TS_TOP=953,TS_BOT=156;
- TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
- TSPoint tp;
- #define MINPRESSURE 200
- #define MAXPRESSURE 1000
- // 颜色值:
- #define BLACK 0x0000
- #define BLUE 0x001F
- #define RED 0xF800
- #define GREEN 0x07E0
- #define CYAN 0x07FF
- #define MAGENTA 0xF81F
- #define YELLOW 0xFFE0
- #define WHITE 0xFFFF
- //RGB颜色
- #define RGB(r,g,b) (((r&0xF8)<<8)|((g&0xFC)<<3)|(b>>3))
- #define GREY RGB(127, 127, 127)
- #define DARKGREY RGB(64, 64, 64)
- #define TURQUOISE RGB(0, 128, 128)
- #define PINK RGB(255, 128, 192)
- #define OLIVE RGB(128, 128, 0)
- #define PURPLE RGB(128, 0, 128)
- #define AZURE RGB(0, 128, 255)
- #define ORANGE RGB(255,128,64)
- #define ch1 A5
- #define max_buf 321
- #define max 320
- #define _ms 150
- #define vatel 5
- int xpos, ypos;
- uint8_t PENRADIUS = 1;
- uint8_t Orientation = 1; //屏幕旋转
- int i,value;
- int time[]={0,7,20,46,102,224,460};
- int _adc,_us;
- int _id; //点击的按钮id
- int buf[max_buf];
- int buf_old[max];
- bool hold=false;
- long t;
- int delay_us=0;
- int Freq,Cycl,Duty,Pw,V_max,V_min,V_mid,Vpp;
- int i1,i2,i3;
- int Tv=209; //触发电压
- String sj[]={" x1:1 "," x10:1 ","x100:1"};
- int mode=0;
- float _Vmax,_Vmin,_Vmid,_Vrms;
- int old_Freq,old_Duty;
- bool parameter=false;
- int adc_i=8;
- /*
- //主菜单
- void man_menu(void){
- tft.fillScreen(BLACK);
- tft.setTextSize(1);
- tft.setTextColor(WHITE, BLACK);
- tft.setCursor(60, 20);
- tft.print("plase select menu");
-
- btn_osc.initButton(&tft,100,60,120,40,WHITE,CYAN,BLACK, "OSC",2);
- btn_pwm.initButton(&tft,100,110,120,40,WHITE,CYAN,BLACK, "PWM",2);
- btn_osc.drawButton(false);
- btn_pwm.drawButton(false);
- while (1) {
- update_button_list(buttons);
- if (btn_osc.justPressed()) {
- btn_osc.drawButton(true);
- osc();
- }
- }
- }*/
- void setup(void){
- tft.reset();
- tft.begin(0x5408);
- tft.setRotation(Orientation);
- osc();
- }
- void draw_btn(int x,int y,int w,int h,String lable){
- tft.setTextColor(WHITE, BLUE);
- tft.drawRoundRect(x, y, w, h, 3, RED);
- tft.setCursor(x+3, y+9);
- tft.print(lable);
- }
- //示波器
- void osc(void){
- tft.fillScreen(BLACK);
- tft.fillRect(0, 0, tft.width(), 30, BLUE);
- tft.fillRect(0, 210, tft.width(), 30, BLUE);
- tft.setTextSize(0);
-
- draw_btn(2,212,48,25," Auto");
- draw_btn(55,212,48,25," x1:1 ");
- draw_btn(108,212,48,25," D+");
- draw_btn(162,212,48,25," D-");
- draw_btn(217,212,48,25,"measure");
- draw_btn(271,212,48,25," Hold");
- while(1){
- bool down =Touch_getXY();
- if(down&&ypos<230&&ypos>200){
- if(xpos>2&&xpos<48){ //Auto
- _id=0;
-
- delay(100);
- }else if(xpos>55&&xpos<103){ //衰减
- _id=1;
- mode++;
- if(mode>2){mode=0;}
- draw_btn(55,212,48,25,sj[mode]);
- }else if(xpos>108&&xpos<157){ //D+
- _id=2;
- _us+=1;
- if(_us>=6){_us=6;}
- }else if(xpos>162&&xpos<210){ //D-
- _id=3;
- _us-=1;
- if(_us<=0){_us=0;}
- }else if(xpos>217&&xpos<266){ //测量
- _id=4;
- tft.fillRect(0, 0, tft.width(), 30, BLUE);
- if(parameter){
- parameter=false;
- }else{
- parameter=true;
- }
- //delay(100);
- }else if(xpos>271&&xpos<320){ //hold
- _id=5;
- tft.setTextColor(WHITE, BLACK);
- tft.setCursor(5, 40);
- if(hold){
- hold=false;
- tft.print(" ");
- }else{
- hold=true;
- tft.print("HOLD");
- }
- delay(100);
- }
- }else if(down&&ypos<200&&ypos>20){ //触发电压
- tft.drawLine(0, Tv, 5, Tv, BLACK);
- Tv=ypos+10;
- }
-
- if(hold==false){
- sampling();
- measure();
- display_cls();
- display();
- }
- }
- }
- //获取触屏位置
- bool Touch_getXY(void){
- tp = ts.getPoint(); //tp.x, tp.y的值从ADC读取
- pinMode(XM, OUTPUT); //恢复共享引脚
- pinMode(YP, OUTPUT);
- bool pressed = (tp.z>MINPRESSURE && tp.z<MAXPRESSURE);
- //模屏竖屏坐标计算
- if (pressed) {
- switch (Orientation) {
- case 0:
- xpos = map(tp.x, TS_LEFT, TS_RT, 0, tft.width());
- ypos = map(tp.y, TS_TOP, TS_BOT, 0, tft.height());
- break;
- case 1:
- xpos = map(tp.y, TS_TOP, TS_BOT, 0, tft.width());
- ypos = map(tp.x, TS_RT, TS_LEFT, 0, tft.height());
- break;
- case 2:
- xpos = map(tp.x, TS_RT, TS_LEFT, 0, tft.width());
- ypos = map(tp.y, TS_BOT, TS_TOP, 0, tft.height());
- break;
- case 3:
- xpos = map(tp.y, TS_BOT, TS_TOP, 0, tft.width());
- ypos = map(tp.y, TS_LEFT, TS_RT, 0, tft.height());
- break;
- }
- /*
- tft.setTextColor(WHITE,BLUE);
- tft.setCursor(250, 10);
- tft.print("x=" + String(xpos) + " y=" + String(ypos) + " ");*/
- }
- return pressed;
- }
- void loop(){
-
-
- }
- //ADC采样通道
- void ADC_pin(uint16_t pin){
- switch(pin){
- case A0: //A0
- ADMUX =_BV(REFS0);break;
- case A1: //A1
- ADMUX =_BV(REFS0)|_BV(MUX0);break;
- case A2: //A2
- ADMUX =_BV(REFS0)|_BV(MUX1);break;
- case A3: //A3
- ADMUX =_BV(REFS0)|_BV(MUX0)|_BV(MUX1);break;
- case A4: //A4
- ADMUX =_BV(REFS0)|_BV(MUX2);break;
- case A5: //A5
- ADMUX =_BV(REFS0)|_BV(MUX0)|_BV(MUX2);break;
- case A6: //A6
- ADMUX =_BV(REFS0)|_BV(MUX1)|_BV(MUX2);break;
- case A7: //A7
- ADMUX=_BV(REFS0)|_BV(MUX0)|_BV(MUX1)|_BV(MUX2);
- break;
- default:
- break;
- }
- //ADMUX |= (1<<REFS1)|(1<<REFS0);//内部1.1V参考电压
- }
- //ADC分频，采样速率
- void ADC_adcsra(int key) {
- switch (key){
- case 4://ADC Sample=16MHz/4/13=307.6KHz,实测142.8KHz
- ADCSRA = _BV(ADPS1); //7us采样一次
- break;
- case 8://ADC Sample=16MHz/8/13=153.8KHz,实测100KHz
- ADCSRA = _BV(ADPS0)|_BV(ADPS1); //10us采样一次
- break;
- case 16://ADC Sample=16MHz/16/13=76.8KHz,实测58.8KHz
- ADCSRA = _BV(ADPS2); //17us采样一次
- break;
- case 32://ADC Sample=16MHz/32/13= 38.4KHz,实测33.3KHz
- ADCSRA = _BV(ADPS2)|_BV(ADPS0); //30us采样一次
- break;
- case 64://ADC Sample=16MHz/64/13= 19.2KHz,实测17.8KHz
- ADCSRA = _BV(ADPS2)|_BV(ADPS1); //56us采样一次
- break;
- case 128://ADC Sample=16MHz/128/13=9600Hz,实测8928Hz
- ADCSRA =_BV(ADPS2)|_BV(ADPS1)|_BV(ADPS0); //112us
- break;
- default:
- break;
- }
- ADCSRA |= _BV(ADEN);
- }
- //获取ADC采样值
- int _analogRead(void){
- bitClear(ADCSRA, ADIF);
- ADCSRA |= _BV(ADSC);
- loop_until_bit_is_set(ADCSRA, ADIF);
- return ADC;
- }
- //采样
- void sampling(){
- ADC_pin(ch1); //使用ch1采样(触摸屏会更改)
- ADC_adcsra(8); //使用4分频采样
- //切换通道后前10次采样是错的，不要
- for(i=0;i<15;i++){_analogRead();}
- t = micros(); //采样开始时间
- for(i=0;i<max_buf;i++){
- buf[i]=_analogRead();
- if(time[_us]>0){delayMicroseconds(time[_us]);}
- }
- t = (micros()-t)/max_buf; //采样1次时间
- ADC_adcsra(128); //恢复128分频给触摸屏
- }
- //计算参数
- void measure(void){
- V_max = buf[0];V_min = buf[0];
- for(i=0;i<max;i++){
- V_max = ((V_max<buf[i])?buf[i]:V_max);//最大值
- V_min = ((V_min>buf[i])?buf[i]:V_min);//最小值
- }
- V_mid = (V_max+V_min)/2; //平均值
- Vpp = (V_max-V_min); //峰峰值
- int H=map(Tv,30,210,1023,0);//触发值
-
- if(Vpp==V_max&&V_mid*2==Vpp){ //方波
- //周期开始点
- for (i=0; i<max;i++){
- if(buf[i]<V_mid&&buf[i+1]>V_mid)
- {i1=i;break;}
- }
- for(i=i1+1;i<max;i++){
- //周期内高电平结束点
- if(buf[i]>V_mid&&buf[i+1]<V_mid){i2=i;}
- //周期结束点
- if(buf[i]<V_mid&&buf[i+1]>V_mid)
- {i3=i;break;}
- }
- Cycl=(i3-i1); //周期时间=周期结速点-周期开始点
- Pw=(i2-i1); //低电平时间
-
- Duty =(Pw*100)/Cycl; //占空比=低电平时间/周期时间
- Freq =1000000/Cycl/t; //频率
- if(Vpp<H){
- Cycl=0;Pw=0;Duty=0;Freq=0;
- }else if(Freq<0){Freq=old_Freq;Duty=old_Duty;}
- }
-
- }
- //显示
- void display(void){
- for(i=0;i<max+1;i++){
- buf[i]=map(buf[i],0,1023,209,31); //计算坐标
- }
- for(i=0;i<max;i++){
- tft.drawLine(i, buf[i], i, buf[i+1], WHITE);
- buf_old[i]=buf[i];
- }
- display_v();
- old_Freq=Freq;
- old_Duty=Duty;
- }
- void display_v(void){
- int a=0;
- tft.setTextColor(WHITE,BLUE);
- if(parameter){
-
- //衰减倍数
- if(mode==0){
- a=1;
- }else if(mode==1){
- a=10;
- }else if(mode==2){
- a=100;
- }
- _Vmax=V_max*vatel/1023;
- _Vmin=V_min*vatel/1023;
- _Vmid=V_mid*vatel/1023;
- _Vrms=Vpp*vatel/1023;
-
- tft.setCursor(2, 5);
- tft.print("Freq:");
- tft.print(Freq);
- tft.print("Hz ");
- tft.setCursor(2, 20);
- tft.print("Cycl:");
- tft.print(Cycl*t);
- tft.print("us ");
- tft.setCursor(85, 5);
- tft.print("Pw:");
- tft.print(Pw*t);
- tft.print("us ");
- tft.setCursor(85, 20);
- tft.print("Duty:");
- tft.print(Duty);
- tft.print("% ");
-
- tft.setCursor(155, 5);
- tft.print("Vmax:");
- tft.print(_Vmax*a);
- tft.print("V ");
- tft.setCursor(155, 20);
- tft.print("Vmin:");
- tft.print(_Vmin*a);
- tft.print("V ");
- tft.setCursor(235, 5);
- tft.print("Vmid:");
- tft.print(_Vmid*a);
- tft.print("V ");
- tft.setCursor(235, 20);
- tft.print("Vrms:");
- tft.print(_Vrms*a);
- tft.print("V ");
- }else{
- tft.setTextColor(WHITE,BLUE);
- tft.setCursor(5, 14);
- tft.print("Arduino Digital OSC V2.0");
- tft.setCursor(250, 20);
- tft.print("Delay:"+String(time[_us]) +"us ");
- }
- }
- //清除
- void display_cls(void){
- for(i=0;i<max;i++){
- tft.drawLine(i, buf_old[i], i, buf_old[i+1], BLACK);
- }
-
- //绘网格
- for(i=32;i<=320;i+=32){ //竖线
- tft.drawLine(i, 30, i, 210, DARKGREY);
- }
- for(i=60;i<=180;i+=30){ //横线
- tft.drawLine(0, i, 320, i, DARKGREY);
- }
- tft.drawLine(0, 120, 320, 120, RED);
- tft.drawLine(160, 30, 160, 210, RED);
- //触发电压
- tft.drawLine(0, Tv, 3, Tv, YELLOW);
-
- }
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