用M5Stack做一个简易秒表

vany5921

    本项目是一个简易秒表程序，程序中设定时间为3分钟，按A键开始计时，再次按A键暂停。

[mw_shl_code=arduino,true]#include <M5Stack.h>

#define TFT_GREY 0x5AEB

uint32_t targetTime = 0;                    // for next 1 second timeout

static uint8_t conv2d(const char* p); // Forward declaration needed for IDE 1.6.x

//uint8_t hh = conv2d(__TIME__), mm = conv2d(__TIME__ + 3), ss = conv2d(__TIME__ + 6); // Get H, M, S from compile time
uint8_t hh = conv2d(__TIME__);
uint8_t mm = 3, ss = 0;
byte omm = 99, oss = 99;
byte xcolon = 0, xsecs = 0;
unsigned int colour = 0;
boolean isMeasuring = false;

int xpos = 0;
int ypos = 85; // Top left corner ot clock text, about half way down
int ysecs = ypos;

void setup(void) {
  //Serial.begin(115200);
  M5.begin();
  // M5.Lcd.setRotation(1);
  M5.Lcd.fillScreen(TFT_BLACK);

  M5.Lcd.setTextSize(1);
  M5.Lcd.setTextColor(TFT_YELLOW, TFT_BLACK);
  xpos += M5.Lcd.drawChar('0', xpos, ypos, 8); // Add minutes leading zero
  xpos += M5.Lcd.drawNumber(mm, xpos, ypos, 8);             // Draw minutes
  xsecs = xpos; // Sae seconds 'x' position for later display updates
  xpos = xsecs;
  M5.Lcd.setTextColor(TFT_YELLOW, TFT_BLACK);    // Set colour back to yellow
  xpos += M5.Lcd.drawChar(':', xsecs, ysecs, 8); // Seconds colon
  //Draw seconds
  xpos += M5.Lcd.drawChar('0', xpos, ysecs, 8); // Add leading zero
  M5.Lcd.drawNumber(ss, xpos, ysecs, 8);                     // Draw seconds
}

void loop() {
  M5.update();
  if (M5.BtnA.wasReleased()) {
    isMeasuring =! isMeasuring;
    delay(5);
  }
  if (!isMeasuring && M5.BtnB.wasReleased()) {
    mm = 3;
    ss = 0;
    delay(5);
  }

  if (targetTime < millis() && isMeasuring ) {
    // Set next update for 1 second later
    targetTime = millis() + 1000;

          // Adjust the time values by adding 1 second
    if( ss == 0 && mm == 0){
      isMeasuring = false; //stop
    }else{
      ss = ss -1 ;              // Advance second
      if (ss == 255) {    // Check for roll-over
        ss = 59;          // Reset seconds to zero
        mm = mm -1;            // Advance minute
        if (mm == 255) {   // Check for roll-over
          mm = 0;
        }
    }
      
    }


    // Update digital time
    xpos = 0;
    ypos = 85; // Top left corner ot clock text, about half way down
    ysecs = ypos;

    if (omm != mm) { // Redraw hours and minutes time every minute
      omm = mm;
      // Draw hours and minutes

      if (mm < 10) xpos += M5.Lcd.drawChar('0', xpos, ypos, 8); // Add minutes leading zero
      xpos += M5.Lcd.drawNumber(mm, xpos, ypos, 8);             // Draw minutes
      xsecs = xpos; // Sae seconds 'x' position for later display updates
    }
    if (oss != ss) { // Redraw seconds time every second
      oss = ss;
      xpos = xsecs;

      if (ss % 2) { // Flash the colons on/off
        M5.Lcd.setTextColor(0x39C4, TFT_BLACK);        // Set colour to grey to dim colon
        xpos += M5.Lcd.drawChar(':', xsecs, ysecs, 8); // Seconds colon
        M5.Lcd.setTextColor(TFT_YELLOW, TFT_BLACK);    // Set colour back to yellow
      }
      else {
        xpos += M5.Lcd.drawChar(':', xsecs, ysecs, 8); // Seconds colon
      }

      //Draw seconds
      if (ss < 10) xpos += M5.Lcd.drawChar('0', xpos, ysecs, 8); // Add leading zero
      M5.Lcd.drawNumber(ss, xpos, ysecs, 8);                     // Draw seconds
    }
  }
}


// Function to extract numbers from compile time string
static uint8_t conv2d(const char* p) {
  uint8_t v = 0;
  if ('0' <= *p && *p <= '9')
    v = *p - '0';
  return 10 * v + *++p - '0';
}[/mw_shl_code]