Raspberry Pi Pico ST7735 80x160 LCD Library

Overview

ST7735 80x160 LCD display library for Raspberry Pi Pico

This project supports:

• ST7735 80x160 LCD
• Backlight control by PWM

Supported Board

• Raspberry Pi Pico
• ST7735S 80x160 LCD
• Waveshare RP2040-LCD-0.96 Board (ST7735S 80x160 LCD build-in)

Pin Assignment

ST7735S 80x160 LCD (Raspberry Pi Pico Board)

Pico Pin #	Pin Name	Function	ST7735S 80x160 Board
12	GP9	GPIO	BLK
14	GP10	SPI1_SCK	SCL
15	GP11	SPI1_TX	SDA
17	GP13	SPI1_CSn	CS
19	GP14	GPIO	DC
20	GP15	GPIO	RES
18	GND	GND	GND
36	3V3(OUT)	3.3V	VCC

ST7735S 80x160 LCD (Waveshare RP2040-LCD-0.96 Board)

Uncomment #define BOARD_WAVESHARE_RP2040_LCD_096 in lcd.h

Pin #	Pin Name	Function	Signal Name
11	GP8	GPIO	DC
12	GP9	SPI1_CSn	CS
14	GP10	SPI1_SCK	SCL
15	GP11	SPI1_TX	DIN
16	GP12	GPIO	RST
--	GP25	GPIO	BL

Serial (CP2102 module)

Pico Pin #	Pin Name	Function	CP2102 module
1	GP0	UART0_TX	RXD
2	GP1	UART0_RX	TXD
3	GND	GND	GND

How to build

• See "Getting started with Raspberry Pi Pico"
• Put "pico-sdk", "pico-examples" and "pico-extras" on the same level with this project folder.
• Set environmental variables for PICO_SDK_PATH, PICO_EXTRAS_PATH and PICO_EXAMPLES_PATH
• Confirmed with Pico SDK 2.0.0

> git clone -b 2.0.0 https://github.com/raspberrypi/pico-sdk.git
> cd pico-sdk
> git submodule update -i
> cd ..
> git clone -b sdk-2.0.0 https://github.com/raspberrypi/pico-examples.git
>
> git clone -b sdk-2.0.0 https://github.com/raspberrypi/pico-extras.git
>
> git clone -b main https://github.com/elehobica/pico_st7735_80x160.git

Windows

• Build is confirmed with Developer Command Prompt for VS 2022 and Visual Studio Code on Windows environment
• Confirmed with cmake-3.27.2-windows-x86_64 and gcc-arm-none-eabi-10.3-2021.10-win32
• Lanuch "Developer Command Prompt for VS 2022"

> cd pico_st7735_80x160\test
> mkdir build && cd build
> cmake -G "NMake Makefiles" ..
> nmake

• Put "pico_st7735_80x160.uf2" on RPI-RP2 drive

Linux

• Build is confirmed with pico-sdk-dev-docker:sdk-2.0.0-1.0.0
• Confirmed with cmake-3.22.1 and arm-none-eabi-gcc (15:10.3-2021.07-4) 10.3.1

$ cd pico_st7735_80x160/test
$ mkdir build && cd build
$ cmake ..
$ make -j4

• Download "pico_st7735_80x160.uf2" on RPI-RP2 drive

Configuration

Configure library settings by LCD_Config() with pico_st7735_80x160_config_t

pico_st7735_80x160_config_t lcd_cfg = {
    SPI_CLK_FREQ_DEFAULT,
    spi1,
    PIN_LCD_SPI1_CS_DEFAULT,
    PIN_LCD_SPI1_SCK_DEFAULT,
    PIN_LCD_SPI1_MOSI_DEFAULT,
    PIN_LCD_DC_DEFAULT,
    PIN_LCD_RST_DEFAULT,
    PIN_LCD_BLK_DEFAULT,
    INVERSION_DEFAULT,  // 0: non-color-inversion, 1: color-inversion
    RGB_ORDER_DEFAULT,  // 0: RGB, 1: BGR
    ROTATION_DEFAULT,
    H_OFS_DEFAULT,
    V_OFS_DEFAULT,
    X_MIRROR_DEFAULT
};
LCD_Config(&lcd_cfg);

Backlight Control from Serial Terminal

When scrolling text display appears at demo final, program accepts Serial Terminal control.

• '+' to increase backlight level
• '-' to decrease backlight level
• 'r' to repeat demo

Application Example

• RPi_Pico_WAV_Player