waveshare electronics 1.8" C yotta microbit code.
https://www.waveshare.com/1.8inch-lcd-for-micro-bit.htm
This is a small subset of commands to talk to the waveshare lcd from the micro:bit using yotta. The official code base uses makecode which can be a tad restrictive if your in a custom microbit project.
This should also talk to any SPI based ST7735S LCD available as long as the following pinouts are defined;
PIN micro:bit PIN Description Vcc 3V3 Power GND GND Ground MISO P14 SPI data master input/slave output MOSI P15 SPI data master output/slave input SCK P13 SPI clock input LCD_CS P16 LCD chip selection RAM_CS P2 SRAM chip selection DC P12 LCD data/command RST P8 LCD reset BL P1 LCD backlight
I compile and run this using yotta as part of my main.cpp
#include "LCD_Driver.h" LCD_Driver ldriv;
ldriv.LCD_Init(void); //Initialise the LCD
ldriv.LCD_SetBL(int Lev); //doesnt seem to work but should change the lcd brightness
ldriv.LCD_Clear(UWORD Color); // sets the BG colour so to clear just call LCD_Clear(0xFFFF); (for white)
ldriv.LCD_ClearBuf(void); //Clear LCD buffer
ldriv.LCD_Display(void); // Draw the screen with whatever changes you have sent
ldriv.LCD_DisplayWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend); // TBD not sure
ldriv.LCD_DrawPoint(int x, int y, int Color, int Dot); // draw pixel
ldriv.LCD_DrawLine(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2,unsigned int colour); //Draw a line (really draws several pixels)
ldriv.LCD_DisString(int Xchar, int Ychar, char Charval[], int Color); // Write String
ldriv.LCD_DrawRectangle(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2,unsigned int colour, unsigned int fill); // draw a square filled, great for screen refreshs of a small area
ldriv.LCD_DrawCircle(int xc, int yc,int r,unsigned int colour, int fill); // Draw a circle and fill it
ldriv.LCD_DisChar_1207(int Xchar, int Ychar, int Char_Offset, int Color); // Draw a single character
MIT
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