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Using this library with 32x16 1/4 Scan Panels

Problem

ESP32-HUB75-MatrixPanel-I2S-DMA library will not display output correctly with 1/4 scan panels such as this.

Solution

It is possible to connect 1/4 scan panels to this library and 'trick' the output to work correctly on these panels by way of adjusting the pixel co-ordinates that are 'sent' to the ESP32-HUB75-MatrixPanel-I2S-DMA library (in this example, it is the 'dmaOutput' class).

Creation of a 'QuarterScanMatrixPanel.h' class which sends an adjusted x,y co-ordinates to the underlying ESP32-HUB75-MatrixPanel-I2S-DMA library's drawPixel routine, to trick the output to look pixel perfect. Refer to the 'getCoords' function within 'QuarterScanMatrixPanel.h'

Limitations

  • Only one font (glcd - standard font) is implemented. This font can't be resized.

New functions (and adapted function) in this QuarterScanMatrixPanel class

drawLine

void drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)

Parameters should be self explained. x0/y0 upper left corner, x1/y1 lower right corner

drawHLine

void drawHLine(int16_t x0, int16_t y0, int16_t w, uint16_t color)

Draw a fast horizontal line with length w. Starting at x0/y0

drawVLine

void drawVLine(int16_t x0, int16_t y0, int16_t h, uint16_t color)

Draw a fast vertical line with length h Starting at x0/y0

fillRect

void fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)

Draw a rectangle starting at x/y with width w and height hin color

drawChar (5x7) Standard font

drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg, uint8_t size)

Draw a char at position x/y in color with a background color bg size is ignored.

writeChar (5x7)

size_t write(unsigned char c)

Write a char at current cursor position with current foreground and background color.

writeString (5x7)

size_t write(const char *c)

Write a string at current cursor position with current foreground and background color. You have to use setCursor(x,y) and setTextFGColor() / setTextBGColor()

drawString (5x7)

void drawString(int16_t x, int16_t y, unsigned char* c, uint16_t color, uint16_t bg)

Draw String at postion x/y wit foreground color and background bg Example: display.drawString(0,5,"**Welcome**",display.color565(0,60,255));

void setScrollDir(uint8_t d = 1)

Set scrolling direction 0=left to right, 1= right to left (default)

scrollText

void scrollText(const char *str, uint16_t speed, uint16_t pixels)

Scroll text str into setScrollDir. Speed indicates how fast in ms per pixel, pixels are the number pixes which should be scrolled, if not set or 0, than pixels is calculates by size of *str

drawPixel(int16_t x, int16_t y, uint16_t color)

Draw a pixel at x/y in color. This function is the atomic function for all above drawing functions

clearScreen() (all pixels off (black))

Same as fillScreen(0)

Example videos:

IMG_4446.mp4
IMG_4436_2.mp4