Arduino 2.4寸TFT彩屏示波器开源啦 -

//################################################
// Arduino TFT示波器
//--------POWER Pins-----------------------
// 5V connects to DC 5V
// GND connects to Ground
// 3V3 do not need to connect(NC)
//--------LCD Display Pins-----------------
// LCD_RD connects to Analog pin A0
// LCD_WR connects to Analog pin A1
// LCD_RS connects to Analog pin A2
// LCD_CS connects to Analog pin A3
// LCD_RST connects to Analog pin A4
// LCD_D0 connects to digital pin 8
// LCD_D1 connects to digital pin 9
// LCD_D2 connects to digital pin 2
// LCD_D3 connects to digital pin 3
// LCD_D4 connects to digital pin 4
// LCD_D5 connects to digital pin 5
// LCD_D6 connects to digital pin 6
// LCD_D7 connects to digital pin 7
//-------SD-card fuction Pins --------------
//This Connection Only for UNO
//SD_SS connects to digital pin 10
//SD_DI connects to digital pin 11
//SD_DO connects to digital pin 12
//SD_SCK connects to digital pin 13
//############################################
#include <Adafruit_GFX.h>
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;
//十六进制颜色
#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 SAMPLE_X 370
#define MAX_X 240 //点显采样点数
#define DEV_WD 20 //每格20个象素
#define view_x 275 //参数显示x座标
#define voltage 4.73 //参考电压
int input_ch1=A5; //A5
int buf_ch1[SAMPLE_X];//通道1采样
int buf_x[MAX_X]; //通道1座标
float Div_Y,V_min,V_max,V_mid,Vpp,V_rms;
int i,i1,i2,i3,Div_X,cycle,high,duty,freq;
unsigned long t,total;
int adc_mode[]={4,8,16,32,64,128};
int adc=2; //adc采样模式（4，8，16，32，64，128）
int hold=1;
String kHz=" "; //KHz,MHz,Hz
int us,count;
int mode=1;
int attenuation=10; //衰减模式
//-------------------------------------------
void setup(){
setADC_ch(input_ch1);
tft.reset();
uint16_t identifier = tft.readID();
tft.begin(identifier);
tft.fillScreen(BLACK);
tft.setRotation(1);
//标题栏
tft.fillRect(0, 0, 320, 19,BLUE);
drawText(10,6,"Arduino Digital osc v1.0");
//底部状态栏
tft.fillRect(0, 222, 320, 222,BLUE);
//参数框
tft.drawRect(242, 20, 78, 200, GREY);
tft.setTextColor(BLUE);
drawText(245,24,"CH1 A5");
tft.setTextColor(RED);
drawText(245,34,"Xdiv:");
drawText(306,34,"us"); //单位
drawText(245,44,"Ydiv:");
drawText(306,44,"v"); //单位
drawText(245,54," max:");
drawText(306,54,"v"); //单位
drawText(245,64," min:");
drawText(306,64,"v"); //单位
drawText(245,74," mid:");
drawText(306,74,"v"); //单位
drawText(245,84," vpp:");
drawText(306,84,"v"); //单位
drawText(245,94,"freq:");
drawText(306,94,"Hz"); //频率单位
drawText(245,104,"duty:");
drawText(306,104,"%"); //占空比百分号
drawText(245,124,"ADC mode:");
drawText(245,155,"delay us:");
pinMode(input_ch1,INPUT);
}
void drawText(int16_t x, int16_t y, String text){
tft.setCursor(x, y);
tft.println(text);
}
void drawText(int16_t x, int16_t y, double text){
tft.setCursor(x, y);
tft.println(text);
}
void drawText(int16_t x, int16_t y, int text){
tft.setCursor(x, y);
tft.println(text);
}
void loop(){
while(1){
sample(); //采样
draw_cls(); //清除上一次的波形
draw_Grid(); //画网格
measure(); //测量参数并显示波形
draw(WHITE); //显示参数
}
}
//ADC分频，采样速率
void setP(int key) {
switch (key){
case 4://ADC Prescaler = 4
//理论 Sample Rate可达16MHz/4/13=307.6KHz
ADCSRA = _BV(ADPS1);break;
case 8://ADC Prescaler = 8
//理论Sample Rate可达16MHz/8/13=153.8KHz,实测93.5KH
ADCSRA = _BV(ADPS0)|_BV(ADPS1);break;
case 16://ADC Prescaler = 16
//理论 Sample Rate 可达16MHz/16/13=76.8KHz
ADCSRA = _BV(ADPS2);break;
case 32://ADC Prescaler = 32
//理论 Sample Rate 可达16MHz/32/13= 38.4KHz
ADCSRA = _BV(ADPS2)|_BV(ADPS0);break;
case 64://ADC Prescaler = 64
//理论 Sample Rate 可达16MHz/64/13= 19.2KHz
ADCSRA = _BV(ADPS2)|_BV(ADPS1);break;
case 128://ADC Prescaler = 128
//理论 Sample Rate 可达16MHz/128/13=9600Hz
ADCSRA = _BV(ADPS2)|_BV(ADPS1)|_BV(ADPS0);break;
default:
break;
}
ADCSRA |= _BV(ADEN);//|_BV(ADATE)|_BV(ADSC);
}
//ADC采样通道
void setADC_ch(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 _BV(REFS1)|
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;
}
}
//获取ADC采样值
unsigned int readADC(){
bitClear(ADCSRA, ADIF);
ADCSRA |= _BV(ADSC);
loop_until_bit_is_set(ADCSRA, ADIF);
return ADC;
}
//采样
void sample(){
setP(adc_mode[adc]); //采样分频模式
t = micros(); //CH1采样开始时间
//CH1 ADC采样
for (i=0;i<SAMPLE_X;i++){
buf_ch1[i]=readADC();
//采样延时
if(count>0){delayMicroseconds(count);}
}
t = (micros()-t)/SAMPLE_X; //采样一次平均耗时
}
//计算参数
void measure(){
V_max = buf_ch1[0];V_min = buf_ch1[0];
for (i = 1; i < MAX_X; i++){
V_max = ((V_max<buf_ch1[i])?buf_ch1[i]:V_max);
V_min = ((V_min>buf_ch1[i])?buf_ch1[i]:V_min);
}
Div_X = t*DEV_WD; //x轴每格多少us
Div_Y = voltage/5; //Y轴每格多少mv
V_mid = (V_max+V_min)/2; //平均值
Vpp = (V_max-V_min); //峰峰值
if(Vpp-V_mid>35){ //方波
//周期开始点
for (i=1; i<MAX_X;i++){
if(buf_ch1[i]<V_mid&&buf_ch1[i+1]>V_mid)
{i1=i;break;}
}
for(i=i1+1;i<MAX_X;i++){
//周期内高电平结束点
if(buf_ch1[i]>V_mid&&buf_ch1[i+1]<V_mid){i2=i;}
//周期结束点
if(buf_ch1[i]<V_mid&&buf_ch1[i+1]>V_mid)
{i3=i;break;}
}
int a=1;
for (i = i1; i < SAMPLE_X; i++){
if(a<MAX_X){
buf_x[a]=map(buf_ch1[i],0,1023,120,20);
a++;
}else{break;}
}
cycle=i3-i1; //周期时间=周期结速点-周期开始点
high =i2-i1; //高电平时间=高电平结束时间-周期开始点
duty =high*100/cycle; //占空比=高电平时间/周期时间
freq =1000000/cycle/t; //频率
if(freq<0){freq=0;}
//set_delay(); //自动模式
}else{
freq=0;duty=0;
for (i = 1; i < SAMPLE_X; i++){
if(i<MAX_X){
buf_x[i]=map(buf_ch1[i],0,1023,120,20);
}
}
}
if(freq>=1000000){freq=freq/1000000;kHz="m";}
else{kHz=" ";}
}
//自动计算采样延时
void set_delay(){
if(high>DEV_WD){
us=(high-DEV_WD)*t/MAX_X;
count=us;
}else if(high<DEV_WD){
us=(DEV_WD-high)*t/MAX_X;
count-=us;
if(count<0){count=0;}
}
}
//显示
void draw(uint16_t Color){
for (i =1;i<MAX_X-1;i++) {
tft.drawLine(i,buf_x[i],i,buf_x[i+1],WHITE);
}
float v=voltage/1023;
tft.setTextColor(Color);
drawText(view_x,34,Div_X); //X轴us每格
drawText(view_x,44,Div_Y); //Y轴mv每格
drawText(view_x,54,V_max*v); //最大值
drawText(view_x,64,V_min*v); //最小值
drawText(view_x,74,V_mid*v); //平均值
drawText(view_x,84,Vpp*v); //落差值
drawText(view_x,94,freq); //频率
drawText(300,94,kHz); //Hz,KHz,MHz
drawText(view_x,104,duty); //占空比
drawText(272,138,adc_mode[adc]); //adc采样分频模式
drawText(272,170,count); //采样延时us
}
//清除波形
void draw_cls(){
for (i=1;i<MAX_X-1;i++){
tft.drawLine(i,buf_x[i],i,buf_x[i+1],BLACK);
buf_x[i]=120;
}
//清除显示的参数
tft.fillRect(274, 32, 30, 80, DARKGREY);
tft.fillRect(260, 134, 40, 16, DARKGREY);
tft.fillRect(260, 165, 40, 16, DARKGREY);
}
//座标轴及刻度
void draw_Grid(){
for (int i=0; i<=MAX_X; i+=DEV_WD){
//Y轴
tft.drawLine(i,20,i,220,DARKGREY);
//X轴
if(i<=220){
tft.drawLine(1,i+DEV_WD,MAX_X-1,i+DEV_WD,DARKGREY);}
}
//Y轴
tft.drawLine(120, 20, 120, 219,RED);
//X轴
tft.drawLine(0, 120, MAX_X, 120,RED);
};

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