Documentation/p/a/rp2040: add docs for waveshare-rp2040-lcd-1.28
Signed-off-by: Peter Bee <bijunda1@xiaomi.com>
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Peter Bee
Xiang Xiao
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===============================
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Waveshare RP2040 LCD 1.28
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===============================
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The `Waveshare RP2040 LCD 1.28 <https://www.waveshare.com/wiki/RP2040-LCD-1.28>`_
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is a low-cost, high-performance MCU board designed by Waveshare based on RP2040
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with onboard 1.28 inch LCD.
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.. figure:: RP2040-LCD-1.28.jpg
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:align: center
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Features
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========
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* RP2040 MCU chip designed by Raspberry Pi in the United Kingdom
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* Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz
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* 264KB of SRAM, and 2MB of onboard Flash memory
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* Type-C connector, keeps it up to date, easier to use
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* Onboard 1.28-inch 240 x 240 resolution, 65K RGB IPS LCD display for clear color pictures
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* Lithium battery recharge/discharge header, suitable for mobile devices
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* All GPIOs are adapted through 1.27 pitch female headers
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(There are 30 pins in total, but some pins have been connected to the internal circuit,
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you need to pay attention when multiplexing, please refer to the wiki for details)
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* USB 1.1 with device and host support
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* Low-power sleep and dormant modes
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* Drag-and-drop programming using mass storage over USB
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* 2 x SPI, 2 x I2C, 2 x UART, 2 x UART, 4 x 12-bit ADC, 16 x controllable PWM channels
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* Accurate clock and timer on-chip
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* Temperature sensor
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* Accelerated floating-point libraries on-chip
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* 8 x Programmable I/O (PIO) state machines for custom peripheral support
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Serial Console
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==============
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By default a serial console appears on pins 1 (TX GPIO0) and pin 2
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(RX GPIO1). This console runs a 115200-8N1.
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The board can be configured to use the USB connection as the serial console.
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Buttons and LEDs
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================
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No user LED is provided.
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A BOOT button, which if held down when pressing RESET or power is first
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applied to the board, will cause the RP2040 to boot into programming
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mode and appear as a storage device to a computer connected via USB.
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Saving a .UF2 file to this device will replace the Flash ROM contents
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on the RP2040.
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Pin Mapping
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===========
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===== ========== ==========
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Pad Signal Notes
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===== ========== ==========
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2 GPIO0 Default TX for UART0 serial console
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4 GPIO1 Default RX for UART0 serial console
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===== ========== ==========
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Power Supply
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============
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The Raspberry Pi Pico can be powered via the USB connector, connecting
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a lithium battery through connector, or by supplying +5V to pin 18(VSYS).
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The board had a diode that prevents power from pin 18 from flowing back
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to the USB socket. Power through USB or VSYS will be charging the battery
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if connected. The schematic is available at `RP2040-LCD-1.28-sch.pdf <https://www.waveshare.net/w/upload/6/60/RP2040-LCD-1.28-sch.pdf>`_
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Configurations
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==============
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composite
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---------
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NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
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CDC/ACM with MSC USB composite driver.
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nsh
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---
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Basic NuttShell configuration (console enabled in UART0, at 115200 bps).
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nsh-flash
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---------
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Basic NuttShell configuration (console enabled in UART0, at 115200 bps
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with SMART flash filesystem.
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nshsram
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-------
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NuttShell configuration (console enabled in UART0, at 115200 bps) with interrupt
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vectors in RAM.
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smp
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---
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Basic NuttShell configuration (console enabled in UART0, at 115200 bps) with
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both ARM cores enabled.
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spisd
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-----
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NuttShell configuration (console enabled in UART0, at 115200 bps) with SPI configured.
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usbmsc
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------
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NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
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usbmsc.
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usbnsh
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------
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Basic NuttShell configuration (console enabled in USB Port, at 115200 bps).
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fb
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------------------
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NuttShell configuration (console enabled in USB Port, at 115200 bps) with support for
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gc9a01 and video framebuffer example.
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lvgl
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-----------------
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NuttShell configuration (console enabled in USB Port, at 115200 bps) with support for
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gc9a01 and LVGL demo (using lcd_dev).
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