Waveshare RP2040 LCD 1.28

The Waveshare RP2040 LCD 1.28 is a low-cost, high-performance MCU board designed by Waveshare based on RP2040 with onboard 1.28 inch LCD.

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Features

  • RP2040 MCU chip designed by Raspberry Pi in the United Kingdom

  • Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz

  • 264KB of SRAM, and 2MB of onboard Flash memory

  • Type-C connector, keeps it up to date, easier to use

  • Onboard 1.28-inch 240 x 240 resolution, 65K RGB IPS LCD display for clear color pictures

  • Lithium battery recharge/discharge header, suitable for mobile devices

  • All GPIOs are adapted through 1.27 pitch female headers (There are 30 pins in total, but some pins have been connected to the internal circuit, you need to pay attention when multiplexing, please refer to the wiki for details)

  • USB 1.1 with device and host support

  • Low-power sleep and dormant modes

  • Drag-and-drop programming using mass storage over USB

  • 2 x SPI, 2 x I2C, 2 x UART, 2 x UART, 4 x 12-bit ADC, 16 x controllable PWM channels

  • Accurate clock and timer on-chip

  • Temperature sensor

  • Accelerated floating-point libraries on-chip

  • 8 x Programmable I/O (PIO) state machines for custom peripheral support

Serial Console

By default a serial console appears on pins 1 (TX GPIO0) and pin 2 (RX GPIO1). This console runs a 115200-8N1.

The board can be configured to use the USB connection as the serial console.

Buttons and LEDs

No user LED is provided.

A BOOT button, which if held down when pressing RESET or power is first applied to the board, will cause the RP2040 to boot into programming mode and appear as a storage device to a computer connected via USB. Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2040.

Pin Mapping

Pad

Signal

Notes

2

GPIO0

Default TX for UART0 serial console

4

GPIO1

Default RX for UART0 serial console

Power Supply

The Raspberry Pi Pico can be powered via the USB connector, connecting a lithium battery through connector, or by supplying +5V to pin 18(VSYS). The board had a diode that prevents power from pin 18 from flowing back to the USB socket. Power through USB or VSYS will be charging the battery if connected. The schematic is available at RP2040-LCD-1.28-sch.pdf

Supported Capabilities

NuttX supports the following RP2040 capabilities:

  • UART (console port)

    • GPIO 0 (UART0 TX) and GPIO 1 (UART0 RX) are used for the console.

  • I2C

  • SPI (master only)

  • DMAC

  • PWM

  • ADC

  • Watchdog

  • USB device

    • MSC, CDC/ACM serial and these composite device are supported.

    • CDC/ACM serial device can be used for the console.

  • PIO (RP2040 Programmable I/O)

  • Flash ROM Boot

  • SRAM Boot

    • If Pico SDK is available, nuttx.uf2 file which can be used in BOOTSEL mode will be created.

  • Persistent flash filesystem in unused flash ROM

  • WiFi wireless communication

There is currently no direct user mode access to these RP2040 hardware features:

  • SPI Slave Mode

  • SSI

  • RTC

  • Timers

NuttX also provide support for these external devices:

  • BMP180 sensor at I2C0 (don’t forget to define I2C0 GPIOs at “I2C0 GPIO pin assign” in Board Selection menu)

  • INA219 sensor / module (don’t forget to define I2C0 GPIOs at “I2C0 GPIO pin assign” in Board Selection menu)

  • SHT4X sensor at I2C0

  • WS2812 smart pixel support

Installation

  1. Download Raspberry Pi Pico SDK

$ git clone -b 2.0.0 https://github.com/raspberrypi/pico-sdk.git

  1. Download and install picotool

Instructions can be found here: https://github.com/raspberrypi/picotool

If you are on Arch Linux, you can install the picotool through the AUR:

$ yay -S picotool

  1. Set PICO_SDK_PATH environment variable

$ export PICO_SDK_PATH=<absolute_path_to_pico-sdk_directory>

  1. Configure and build NuttX

$ git clone https://github.com/apache/nuttx.git nuttx
$ git clone https://github.com/apache/nuttx-apps.git apps
$ cd nuttx
$ make distclean
$ ./tools/configure.sh waveshare-rp2040-lcd-1.28:nsh
$ make V=1

  1. Connect the Waveshare RP2040 board to USB port while pressing BOOT. The board will be detected as USB Mass Storage Device. Then copy “nuttx.uf2” into the device. (Same manner as the standard Pico SDK applications installation.)

  2. To access the console, GPIO 0 and 1 pins must be connected to the device such as USB-serial converter.

    usbnsh configuration provides the console access by USB CDC/ACM serial decive. The console is available by using a terminal software on the USB host.

Configurations

composite

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for CDC/ACM with MSC USB composite driver. conn command enables the composite device.

nsh

Basic NuttShell configuration (console enabled in UART0, at 115200 bps).

nsh-flash

Basic NuttShell configuration (console enabled in UART0, at 115200 bps with SMART flash filesystem.

nshsram

NuttShell configuration (console enabled in UART0, at 115200 bps) with interrupt vectors in RAM.

smp

Basic NuttShell configuration (console enabled in UART0, at 115200 bps) with both ARM cores enabled.

spisd

NuttShell configuration (console enabled in UART0, at 115200 bps) with SPI SD card support enabled.

spisd connections

SD card slot

Waveshare RP2040

DAT2

Not connected

DAT3/CS

GP17 (SPI0 CSn) (Pin 22)

CMD /DI

GP19 (SPI0 TX) (Pin 25)

VDD

3V3 OUT (Pin 36)

CLK/SCK

GP18 (SPI0 SCK) (Pin 24)

VSS

GND (Pin 3 or 38 or …)

DAT0/DO

GP16 (SPI0 RX) (Pin 21)

DAT1

Not connected

Card hot swapping is not supported.

usbmsc

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for USB MSC and CDC/ACM.

msconn and sercon commands enable the MSC and CDC/ACM devices. The MSC support provides the interface to the SD card with SPI, so the SD card slot connection like spisd configuration is required.

usbnsh

Basic NuttShell configuration using CDC/ACM serial (console enabled in USB Port, at 115200 bps).

fb

NuttShell configuration (console enabled in USB Port, at 115200 bps) with support for gc9a01 and video framebuffer example.

lvgl

NuttShell configuration (console enabled in USB Port, at 115200 bps) with support for gc9a01 and LVGL demo (using lcd_dev).

License exceptions

The following files are originated from the files in Pico SDK. So, the files are licensed under 3-Clause BSD same as Pico SDK.

  • arch/arm/src/rp2040/rp2040_clock.c

  • arch/arm/src/rp2040/rp2040_pll.c

  • arch/arm/src/rp2040/rp2040_xosc.c

    • These are created by referring the Pico SDK clock initialization.

  • arch/arm/src/rp2040/rp2040_pio.c

  • arch/arm/src/rp2040/rp2040_pio.h

  • arch/arm/src/rp2040/rp2040_pio_instructions.h

    • These provide the similar APIs to Pico SDK’s hardware_pio APIs.

  • arch/arm/src/rp2040/hardware/*.h

    • These are generated from rp2040.svd originally provided in Pico SDK.