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M5StickCOscilloscope.ino
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M5StickCOscilloscope.ino
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#include <M5StickC.h>
const int LCD_WIDTH = 160;
const int LCD_HEIGHT = 80;
const int SAMPLES = 160;
const int DOTS_DIV = 10;
const int ad_ch0 = 26; // Analog 26 pin for channel 0
const int ad_ch1 = 36; // Analog 36 pin for channel 1
const long VREF[] = { 250, 500, 1250, 2500, 5000 };
const int MILLIVOL_per_dot[] = { 33, 17, 6, 3, 2 };
const int MODE_ON = 0;
const int MODE_INV = 1;
const int MODE_OFF = 2;
const char *Modes[] = { "NORM", "INV", "OFF" };
const int TRIG_AUTO = 0;
const int TRIG_NORM = 1;
const int TRIG_SCAN = 2;
const char *TRIG_Modes[] = { "Auto", "Norm", "Scan" };
const int TRIG_E_UP = 0;
const int TRIG_E_DN = 1;
#define RATE_MIN 0
#define RATE_MAX 13
const char *Rates[] = { "F1-1", "F1-2", " F2", " 5ms", "10ms", "20ms", "50ms", "0.1s", "0.2s", "0.5s", "1s", "2s", "5s", "10s" };
short rate = 3;
#define RANGE_MIN 0
#define RANGE_MAX 4
const char *Ranges[] = { " 1V", "0.5V", "0.2V", "0.1V", "50mV" };
int range0 = RANGE_MIN;
short range1 = RANGE_MIN;
short ch0_mode = MODE_ON;
short ch1_mode = MODE_ON;
int ch0_off = 0;
int ch1_off = 0;
short trig_mode = TRIG_AUTO;
int trig_lv = 40;
short trig_edge = TRIG_E_UP;
short trig_ch = 0;
short Start = 1;
short menu = 19;
short data[4][SAMPLES]; // keep twice of the number of channels to make it a double buffer
short sample = 0; // index for double buffer
int amplitude = 0;
int amplitudeStep = 5;
TaskHandle_t LedC_Gen;
TaskHandle_t SigmaDeltaGen;
///////////////////////////////////////////////////////////////////////////////////////////////
#define CH1COLOR YELLOW
#define CH2COLOR CYAN
#define GREY 0x7BEF
int lastmenu = 0;
void DrawText()
{
// if (lastmenu == menu)
// return;
//` lastmenu = menu;
M5.Lcd.setRotation(0);
if (menu > 19)
{
M5.Lcd.fillRect(5, menu - 10, 40, 10, BLACK);
}
else if (menu == 19)
{
M5.Lcd.fillRect(5, 129, 40, 10, BLACK);
}
//DrawGrid();
M5.Lcd.fillRect(5, menu, 40, 10, BLUE);
M5.Lcd.drawString((Start == 1 ? "Stop" : "Run"), 5, 20);
M5.Lcd.drawString(String(String(Ranges[range0]) + "/DIV"), 5, 30);
M5.Lcd.drawString(String(String(Ranges[range1]) + "/DIV"), 5, 40);
M5.Lcd.drawString(String(String(Rates[rate]) + "/DIV"), 5, 50);
M5.Lcd.drawString(String(Modes[ch0_mode]), 5, 60);
M5.Lcd.drawString(String(Modes[ch1_mode]), 5, 70);
M5.Lcd.drawString(String("OFS1:" + String(ch0_off)), 5, 80);
M5.Lcd.drawString(String("OFS2:" + String(ch1_off)), 5, 90);
M5.Lcd.drawString(String(trig_ch == 0 ? "T:1" : "T:2"), 5, 100);
M5.Lcd.drawString(String(TRIG_Modes[trig_mode]), 5, 110);
M5.Lcd.drawString(String("Tlv:" + String(trig_lv)), 5, 120);
M5.Lcd.drawString(String((trig_edge == TRIG_E_UP) ? "T:UP" : "T:DN"), 5, 130);
M5.Lcd.setRotation(3);
}
void CheckSW()
{
M5.update();
if (M5.BtnA.wasPressed())
{
(menu < 129) ? (menu += 10) : (menu = 19);
DrawText();
return;
}
if (M5.BtnB.wasPressed())
{
switch (menu)
{
case 19:
Start = !Start;
break;
case 29:
if (++range0 > RANGE_MAX)
range0 = RANGE_MIN;
break;
case 39:
if (++range1 > RANGE_MAX)
range1 = RANGE_MIN;
break;
case 49:
if (++rate > RATE_MAX)
rate = RATE_MIN;
break;
case 59:
if (++ch0_mode > MODE_OFF)
ch0_mode = MODE_ON;
break;
case 69:
if (++ch1_mode > MODE_OFF)
ch1_mode = MODE_ON;
break;
case 79:
if (ch0_off < 4095)
ch0_off += 4096 / VREF[range0];
else
ch0_off = 0;
break;
case 89:
if (ch1_off < 4095)
ch1_off += 4096 / VREF[range1];
else
ch1_off = 0;
break;
case 99:
trig_ch = !trig_ch;
break;
case 109:
if (++trig_mode > TRIG_SCAN)
trig_mode = TRIG_AUTO;
break;
case 119:
if (++trig_lv > 60)
trig_lv = 0;
break;
case 129:
trig_edge = !trig_edge;
break;
}
DrawText();
return;
}
}
void DrawGrid()
{
for (int x = 0; x <= SAMPLES; x += 2) // Horizontal Line
{
for (int y = 0; y <= LCD_HEIGHT; y += DOTS_DIV)
{
M5.Lcd.drawPixel(x, y, GREY);
CheckSW();
}
if (LCD_HEIGHT == 80)
{
M5.Lcd.drawPixel(x, LCD_HEIGHT - 1, GREY);
}
}
for (int x = 0; x <= SAMPLES; x += DOTS_DIV) // Vertical Line
{
for (int y = 0; y <= LCD_HEIGHT; y += 2)
{
M5.Lcd.drawPixel(x, y, GREY);
CheckSW();
}
}
}
void DrawGrid(int x)
{
if ((x % 2) == 0)
{
for (int y = 0; y <= LCD_HEIGHT; y += DOTS_DIV)
{
M5.Lcd.drawPixel(x, y, GREY);
}
}
if ((x % DOTS_DIV) == 0)
{
for (int y = 0; y <= LCD_HEIGHT; y += 2)
{
M5.Lcd.drawPixel(x, y, GREY);
}
}
}
void ClearAndDrawGraph()
{
int clear = 0;
if (sample == 0)
{
clear = 2;
}
for (int x = 0; x < (SAMPLES - 1); x++)
{
M5.Lcd.drawLine(x, LCD_HEIGHT - data[clear + 0][x], x + 1, LCD_HEIGHT - data[clear + 0][x + 1], BLACK);
M5.Lcd.drawLine(x, LCD_HEIGHT - data[clear + 1][x], x + 1, LCD_HEIGHT - data[clear + 1][x + 1], BLACK);
if (ch0_mode != MODE_OFF)
{
M5.Lcd.drawLine(x, LCD_HEIGHT - data[sample + 0][x], x + 1, LCD_HEIGHT - data[sample + 0][x + 1], CH1COLOR);
}
if (ch1_mode != MODE_OFF)
{
M5.Lcd.drawLine(x, LCD_HEIGHT - data[sample + 1][x], x + 1, LCD_HEIGHT - data[sample + 1][x + 1], CH2COLOR);
}
CheckSW();
}
}
void ClearAndDrawDot(int i)
{
int clear = 0;
if (i <= 1)
{
return;
}
if (sample == 0)
{
clear = 2;
}
M5.Lcd.drawLine(i - 1, LCD_HEIGHT - data[clear + 0][i - 1], i, LCD_HEIGHT - data[clear + 0][i], BLACK);
M5.Lcd.drawLine(i - 1, LCD_HEIGHT - data[clear + 1][i - 1], i, LCD_HEIGHT - data[clear + 1][i], BLACK);
if (ch0_mode != MODE_OFF)
{
M5.Lcd.drawLine(i - 1, LCD_HEIGHT - data[sample + 0][i - 1], i, LCD_HEIGHT - data[sample + 0][i], CH1COLOR);
}
if (ch1_mode != MODE_OFF)
{
M5.Lcd.drawLine(i - 1, LCD_HEIGHT - data[sample + 1][i - 1], i, LCD_HEIGHT - data[sample + 1][i], CH2COLOR);
}
DrawGrid(i);
}
inline long adRead(short ch, short mode, int off)
{
long a = analogRead(ch);
a = (((a + off) * VREF[(ch == ad_ch0) ? range0 : range1]) / 10000UL) + 30;
a = ((a >= LCD_HEIGHT) ? LCD_HEIGHT : a);
if (mode == MODE_INV)
{
return LCD_HEIGHT - a;
}
return a;
}
void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255)
{
uint32_t duty = (8191 / valueMax) * min(value, valueMax);
ledcWrite(channel, duty);
}
// Make a PWM generator task on core 0
// Signal generator pin 2
void LedC_Task(void *parameter)
{
ledcSetup(0, 50, 13);
ledcAttachPin(33, 0);
for (;;)
{
while(!Start) { ledcWrite(0,-1); delay(1); };
ledcAnalogWrite(0, amplitude);
amplitude = amplitude + amplitudeStep;
if (amplitude <= 0 || amplitude >= 255)
{
amplitudeStep = -amplitudeStep;
}
delay(30);
}
vTaskDelete(NULL);
}
void SigmaDelta_Task(void *parameter)
{
sigmaDeltaSetup(0, 312500);
sigmaDeltaAttachPin(32, 0);
sigmaDeltaWrite(0, 0);
for (;;)
{
static uint8_t i = 0;
sigmaDeltaWrite(0, i++);
delayMicroseconds(50);
}
vTaskDelete(NULL);
}
void setup()
{
M5.begin();
M5.Lcd.setRotation(3);
M5.Lcd.setTextSize(1);
M5.Lcd.setTextColor(WHITE);
M5.Lcd.fillScreen(BLACK);
DrawGrid();
DrawText();
//M5.Lcd.setBrightness(100);
dacWrite(25, 0);
xTaskCreatePinnedToCore(
LedC_Task, /* Task function. */
"LedC_Task", /* name of the task, a name just for humans */
8192, /* Stack size of task */
NULL, /* parameter of the task */
1, /* priority of the task */
&LedC_Gen, /* Task handle to keep track of the created task */
1); /*cpu core number where the task is assigned*/
xTaskCreatePinnedToCore(
SigmaDelta_Task, /* Task function. */
"SigmaDelta_Task", /* name of task, a name just for humans */
8192, /* Stack size of task */
NULL, /* parameter of the task */
1, /* priority of the task */
&SigmaDeltaGen, /* Task handle to keep track of the created task */
1); /*cpu core number where the task is assigned*/
}
void loop()
{
if (trig_mode != TRIG_SCAN)
{
unsigned long st = millis();
short oad = (trig_ch == 0) ? (adRead(ad_ch0, ch0_mode, ch0_off)) : (adRead(ad_ch1, ch1_mode, ch1_off));
for (;;)
{
short ad;
if (trig_ch == 0)
{
ad = adRead(ad_ch0, ch0_mode, ch0_off);
}
else
{
ad = adRead(ad_ch1, ch1_mode, ch1_off);
}
if (trig_edge == TRIG_E_UP)
{
if (ad >= trig_lv && ad > oad)
{
break;
}
}
else
{
if (ad <= trig_lv && ad < oad)
{
break;
}
}
oad = ad;
CheckSW();
if (trig_mode == TRIG_SCAN)
{
break;
}
if (trig_mode == TRIG_AUTO && (millis() - st) > 100)
{
break;
}
}
}
// sample and draw depending on the sampling rate
if (rate <= 5 && Start)
{
(sample == 0) ? (sample = 2) : (sample = 0); // change the index for the double buffer
if (rate == 0) // full speed, channel 0 only
{
for (int i = 0; i < SAMPLES; i++)
{
data[sample + 0][i] = adRead(ad_ch0, ch0_mode, ch0_off);
}
for (int i = 0; i < SAMPLES; i++)
{
data[sample + 1][i] = 0;
}
}
else if (rate == 1) // full speed, channel 1 only
{
for (int i = 0; i < SAMPLES; i++)
{
data[sample + 1][i] = adRead(ad_ch1, ch1_mode, ch1_off);
}
for (int i = 0; i < SAMPLES; i++)
{
data[sample + 0][i] = 0;
}
}
else if (rate == 2) // full speed, dual channel
{
for (int i = 0; i < SAMPLES; i++)
{
data[sample + 0][i] = adRead(ad_ch0, ch0_mode, ch0_off);
data[sample + 1][i] = adRead(ad_ch1, ch1_mode, ch1_off);
}
}
else if (rate >= 3 && rate <= 5) // .5ms, 1ms or 2ms sampling
{
const unsigned long r_[] = { 5000 / DOTS_DIV, 10000 / DOTS_DIV, 20000 / DOTS_DIV };
unsigned long st = micros();
unsigned long r = r_[rate - 3];
for (int i = 0; i < SAMPLES; i++)
{
while ((st - micros()) < r)
{
;
}
st += r;
data[sample + 0][i] = adRead(ad_ch0, ch0_mode, ch0_off);
data[sample + 1][i] = adRead(ad_ch1, ch1_mode, ch1_off);
}
}
ClearAndDrawGraph();
CheckSW();
DrawGrid();
DrawText();
}
else if (Start)
{ // 5ms - 500ms sampling
// copy currently showing data to another
if (sample == 0)
{
for (int i = 0; i < SAMPLES; i++)
{
data[2][i] = data[0][i];
data[3][i] = data[1][i];
}
}
else
{
for (int i = 0; i < SAMPLES; i++)
{
data[0][i] = data[2][i];
data[1][i] = data[3][i];
}
}
const unsigned long r_[] = { 50000 / DOTS_DIV, 100000 / DOTS_DIV, 200000 / DOTS_DIV,
500000 / DOTS_DIV, 1000000 / DOTS_DIV, 2000000 / DOTS_DIV,
5000000 / DOTS_DIV, 10000000 / DOTS_DIV };
unsigned long st = micros();
for (int i = 0; i < SAMPLES; i++)
{
while ((st - micros()) < r_[rate - 6])
{
CheckSW();
if (rate < 6)
{
break;
}
}
if (rate < 6) // sampling rate has been changed
{
break;
}
st += r_[rate - 6];
if (st - micros() > r_[rate - 6]) // sampling rate has been changed to shorter interval
{
st = micros();
}
if (!Start)
{
i--;
continue;
}
data[sample + 0][i] = adRead(ad_ch0, ch0_mode, ch0_off);
data[sample + 1][i] = adRead(ad_ch1, ch1_mode, ch1_off);
ClearAndDrawDot(i);
}
DrawGrid();
DrawText();
}
else
{
CheckSW();
}
M5.update();
}