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2dom / PxMatrix

Adafruit GFX compatible graphics driver for LED matrix panels
BSD 3-Clause "New" or "Revised" License
842 stars 171 forks source link

Two displays in a chain problem #325

Closed ITstreet1 closed 8 months ago

ITstreet1 commented 1 year ago

Hi,

I use this lib to drive one Waveshare 64x64 display with an ESP12F. Zero problems. https://www.waveshare.com/wiki/RGB-Matrix-P2.5-64x64

However, when I tried to connect two in a chain, I didn't get the expected result. I used this modified example from the lib.

// This is how many color levels the display shows - the more the slower the update
//#define PxMATRIX_COLOR_DEPTH 8

// Defines the buffer height / the maximum height of the matrix
//#define PxMATRIX_MAX_HEIGHT 64

// Defines the buffer width / the maximum width of the matrix
//#define PxMATRIX_MAX_WIDTH 64

// Defines how long we display things by default
//#define PxMATRIX_DEFAULT_SHOWTIME 30

// Defines the speed of the SPI bus (reducing this may help if you experience noisy images)
//#define PxMATRIX_SPI_FREQUENCY 20000000

// Creates a second buffer for backround drawing (doubles the required RAM)
//#define PxMATRIX_double_buffer true

#include <PxMatrix.h>

// Pins for LED MATRIX
#ifdef ESP32

#define P_LAT 22
#define P_A 19
#define P_B 23
#define P_C 18
#define P_D 5
#define P_E 15
#define P_OE 2
hw_timer_t * timer = NULL;
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;

#endif

#ifdef ESP8266

#include <Ticker.h>
Ticker display_ticker;
#define P_LAT 16
#define P_A 5
#define P_B 4
#define P_C 15
#define P_D 12
#define P_E 0
#define P_OE 2

#endif

#define matrix_width 128
#define matrix_height 64

// This defines the 'on' time of the display is us. The larger this number,
// the brighter the display. If too large the ESP will crash
uint8_t display_draw_time=50; //30-70 is usually fine

//PxMATRIX display(32,16,P_LAT, P_OE,P_A,P_B,P_C);
//PxMATRIX display(64,32,P_LAT, P_OE,P_A,P_B,P_C,P_D);
PxMATRIX display(128,64,P_LAT, P_OE,P_A,P_B,P_C,P_D,P_E);

// Some standard colors
uint16_t myRED = display.color565(255, 0, 0);
uint16_t myGREEN = display.color565(0, 255, 0);
uint16_t myBLUE = display.color565(0, 0, 255);
uint16_t myWHITE = display.color565(255, 255, 255);
uint16_t myYELLOW = display.color565(255, 255, 0);
uint16_t myCYAN = display.color565(0, 255, 255);
uint16_t myMAGENTA = display.color565(255, 0, 255);
uint16_t myBLACK = display.color565(0, 0, 0);

uint16_t myCOLORS[8]={myRED,myGREEN,myBLUE,myWHITE,myYELLOW,myCYAN,myMAGENTA,myBLACK};

uint8_t static weather_icons[]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0xff,0xe0,0x00,0x00,0x00,0x00,0xff,0xe0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0xff,0x07,0xff,0x07,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x07,0xff,0x07,0xff,0x07,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xe0,0xff,0xe0,0xff,0xe0,0xff,0xe0,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0xff,0xe0,0xff,0xe0,0xff,0xe0,0xff,0xe0,0xff,0xe0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xe0,0xff,0xe0,0xff,0xe0,0xff,0xe0,0xff,0xe0,0x00,0x00,0x00,0x00,0x00,0x00
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};

#ifdef ESP8266
// ISR for display refresh
void display_updater()
{
  display.display(display_draw_time);
}
#endif

#ifdef ESP32
void IRAM_ATTR display_updater(){
  // Increment the counter and set the time of ISR
  portENTER_CRITICAL_ISR(&timerMux);
  display.display(display_draw_time);
  portEXIT_CRITICAL_ISR(&timerMux);
}
#endif

void display_update_enable(bool is_enable)
{

#ifdef ESP8266
  if (is_enable)
    display_ticker.attach(0.004, display_updater);
  else
    display_ticker.detach();
#endif

#ifdef ESP32
  if (is_enable)
  {
    timer = timerBegin(0, 80, true);
    timerAttachInterrupt(timer, &display_updater, true);
    timerAlarmWrite(timer, 4000, true);
    timerAlarmEnable(timer);
  }
  else
  {
    timerDetachInterrupt(timer);
    timerAlarmDisable(timer);
  }
#endif
}

void setup() {

 Serial.begin(9600);
  // Define your display layout here, e.g. 1/8 step, and optional SPI pins begin(row_pattern, CLK, MOSI, MISO, SS)
  display.begin(32);
  //display.begin(8, 14, 13, 12, 4);

  // Define multiplex implemention here {BINARY, STRAIGHT} (default is BINARY)
  //display.setMuxPattern(BINARY);

  // Set the multiplex pattern {LINE, ZIGZAG,ZZAGG, ZAGGIZ, WZAGZIG, VZAG, ZAGZIG} (default is LINE)
  //display.setScanPattern(LINE);

  // Rotate display
  //display.setRotate(true);

  // Flip display
  //display.setFlip(true);

  // Control the minimum color values that result in an active pixel
  //display.setColorOffset(5, 5,5);

  // Set the multiplex implemention {BINARY, STRAIGHT} (default is BINARY)
  //display.setMuxPattern(BINARY);

  // Set the color order {RRGGBB, RRBBGG, GGRRBB, GGBBRR, BBRRGG, BBGGRR} (default is RRGGBB)
  //display.setColorOrder(RRGGBB);

  // Set the time in microseconds that we pause after selecting each mux channel
  // (May help if some rows are missing / the mux chip is too slow)
  //display.setMuxDelay(0,1,0,0,0);

  // Set the number of panels that make up the display area width (default is 1)
  display.setPanelsWidth(2);

  // Set the brightness of the panels (default is 255)
  //display.setBrightness(50);

  // Set driver chip type
  //display.setDriverChip(FM6124);

  display.clearDisplay();
  display.setTextColor(myCYAN);
  display.setCursor(2,0);
  display.print("Pixel");
  display.setTextColor(myMAGENTA);
  display.setCursor(2,8);
  display.print("Time");
  display_update_enable(true);

  delay(3000);

}
union single_double{
  uint8_t two[2];
  uint16_t one;
} this_single_double;

// This draws the weather icons
void draw_weather_icon (uint8_t icon)
{
  if (icon>10)
  icon=10;
  for (int yy=0; yy<10;yy++)
  {
    for (int xx=0; xx<10;xx++)
    {
      uint16_t byte_pos=(xx+icon*10)*2+yy*220;
      this_single_double.two[1]=weather_icons[byte_pos];
      this_single_double.two[0]=weather_icons[byte_pos+1];
      display.drawPixel(1+xx,yy,this_single_double.one);
    }
  }
}

unsigned long last_draw=0;
void scroll_text(uint8_t ypos, unsigned long scroll_delay, String text, uint8_t colorR, uint8_t colorG, uint8_t colorB)
{
    uint16_t text_length = text.length();
    display.setTextWrap(false);  // we don't wrap text so it scrolls nicely
    display.setTextSize(1);
    display.setRotation(0);
    display.setTextColor(display.color565(colorR,colorG,colorB));

    // Asuming 5 pixel average character width
    for (int xpos=matrix_width; xpos>-(matrix_width+text_length*5); xpos--)
    {
      display.setTextColor(display.color565(colorR,colorG,colorB));
      display.clearDisplay();
      display.setCursor(xpos,ypos);
      display.println(text);
      delay(scroll_delay);
      yield();

      // This might smooth the transition a bit if we go slow
      // display.setTextColor(display.color565(colorR/4,colorG/4,colorB/4));
      // display.setCursor(xpos-1,ypos);
      // display.println(text);

      delay(scroll_delay/5);
      yield();

    }
}

uint8_t icon_index=0;
void loop() {
  scroll_text(40,50,"Welcome to PxMatrix!",96,96,250);
  display.clearDisplay();

  draw_weather_icon(icon_index);
  icon_index++;
  if (icon_index>10)
    icon_index=0;

  for (int xx=0; xx<16;xx++)
  {
    display.drawLine(xx+16,0,xx+16,5,display.color565(xx*16,0,0));
    display.drawLine(xx+16,6,xx+16,10,display.color565(0,xx*16,0));
    display.drawLine(xx+16,11,xx+16,15,display.color565(0,0,xx*16));
  }
  delay(1000);
  for (uint8_t dimm=255; dimm>0; dimm--)
  {
    display.setBrightness(dimm);
    delay(5);
  }
  for (uint8_t dimm=0; dimm<255; dimm++)
  {
    display.setBrightness(dimm);
    delay(5);
  }

}

Do I have to set something else in addition?

While driving the first one, I connected as you suggested here, and it is ok. With the second one, I connected the PO of the first to the PI of the second with a 16p IDC cable. The PO of the second I connected to the ESP12F. The connection should be ok.

2dom commented 1 year ago

PxMatrix is not the best solution for driving larger displays. Please some library with parallel data lines and DMA support.

ITstreet1 commented 1 year ago

The other words, not to mess up too much with this lib and displays in a chain? With one display, the lib is great.

2dom commented 1 year ago

Exactly...it is really meant for low pin count and not much more than 64x64 pixels

ITstreet1 commented 1 year ago

Thank you.

The one you gave a link here should do the job. Although the wiring is different.