CH32V003 ST7789 Driver

A minimal ST7789 LCD driver for CH32V003 that supports both ch32v003fun and PlatformIO CH32V. It should also work in MounRiver Studio.

DMA is used to accelerate the data transmission where possible.

• CH32V003 ST7789 Driver
  • Usage
    • Wiring
    • Initialization
    • Text
    • Drawing
  • Configuration
    • Change Resolution and Offset
    • RGB Color Macro
    • Set Rotation and RGB Ordering
    • Invert Colors
  • CH32V003 Development Guide
  • References
  • License

Usage

Wiring

ST7789 13-pin module

CH32V003	ST7789	Power	Description
	1 - NC
	2 - NC
PC6 (SPI MOSI)	3 - SDA		SPI MOSI (Master Output Slave In)
PC5 (SPI SCLK)	4 - SCL		SPI SCLK (Serial Clock)
PC4	5 - RS		DC (Data / Command)
PC3	6 - RESET		Reset
PC2	7 - CS		SPI CS/SS (Chip/Slave Select)
	8 - GND	GND
	9 - NC
	10 - VDD	3V3
	11 - LEDK		Connect to GND via a 15-100Ω resistor
	12 - LEDA	3V3
	13 - GND	GND

Note: To not use CS, define the ST7789_NO_CS macro in ST7789.h. Make ST7789 always enabled by pulling CS to ground.

#define ST7789_NO_CS

Initialization

Include the header file.

#include "ST7789.h"

Then invoke tft_init() function to initialize the driver.

tft_init();

Text

Print a string.

tft_set_color(RED);
tft_set_background_color(BLACK);
tft_set_cursor(2, 2);
tft_print("Hello World!");

Print integers.

tft_set_color(RED);
tft_set_background_color(BLACK);
tft_set_cursor(2, 10);
tft_print_number(123, 0);   // Align left as the width is less thant the number.
tft_set_cursor(2, 20);
tft_print_number(-123, 30); // Align right as the width is greater than the number.

Drawing

Draw a pixel.

tft_draw_pixel(80, 30, RED);

Draw a line.

tft_draw_line(10, 10, 30, 30, BLUE);

Draw a rectangle.

tft_draw_rect(10, 10, 30, 30, BLUE);

Fill a rectangle area.

tft_fill_rect(10, 10, 30, 30, BLUE);

Configuration

Depends on which ST7789 variants you have, it may require different configurations. You can configure the behavior in ST7789.h or ST7789.c.

Change Resolution and Offset

// ST7789.h
#define ST7789_WIDTH    240
#define ST7789_HEIGHT   135
#define ST7789_X_OFFSET 40
#define ST7789_Y_OFFSET 53

RGB Color Macro

// ST7789.h
#define RGB565(r, g, b) ((((r)&0xF8) << 8) | (((g)&0xFC) << 3) | ((b) >> 3))
#define BGR565(r, g, b) ((((b)&0xF8) << 8) | (((g)&0xFC) << 3) | ((r) >> 3))
#define RGB             RGB565

Set Rotation and RGB Ordering

// ST7789.c
void tft_init(void)
{
    ...
    // Set rotation
    // Set rotation
    write_command_8(ST7789_MADCTL);
    // write_data_8(ST7789_MADCTL_MY | ST7789_MADCTL_MV | ST7789_MADCTL_RGB);  // 0 - Horizontal
    // write_data_8(ST7789_MADCTL_RGB);                                        // 1 - Vertical
    write_data_8(ST7789_MADCTL_MX | ST7789_MADCTL_MV | ST7789_MADCTL_RGB);  // 2 - Horizontal
    // write_data_8(ST7789_MADCTL_MX | ST7789_MADCTL_MY | ST7789_MADCTL_RGB);  // 3 - Vertical
    ...
}

Invert Colors

// ST7789.c
void tft_init(void)
{
    ...
    // Invert display
    write_command_8(ST7789_INVON);
    // write_command_8(ST7789_INVOFF);
    ...
}

CH32V003 Development Guide

CH32V003 Development Guide

References

• moononournation: Arduino_GFX
• ST7789 Datasheet
• E. Brombaugh: SPI OLED demonstration

License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0).

• Attribution - You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• NonCommercial - You may not use the material for commercial purposes.
• ShareAlike - If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.