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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
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== Summary ==<br />
The Waveshare RP2040-Touch-LCD-1.28 is a compact development board featuring a 1.28-inch round capacitive touch LCD (GC9A01A), the CST816S touch controller, and the QMI8658 IMU. It is built around the Raspberry Pi RP2040 microcontroller.<br />
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== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL24580 WSAL24580 – RP2040 Microcontroller Development Board, with 1.28inch Round Touch LCD, Compact size, Accelerometer And Gyroscope Sensor]<br />
* [https://shop.jw-tech.eu/p/WSAL26371 WSAL26371 – RP2040 Microcontroller Development Board, with 1.28inch Round Touch LCD, Accelerometer And Gyroscope Sensor, With CNC Metal Case]<br />
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== Technical overview ==<br />
* The RP2040 processor provides dual-core ARM Cortex-M0+ cores running up to 133 MHz.<br />
* The board includes 264 KB of SRAM and 4 MB of on-chip Flash storage.<br />
* The display uses an IPS panel with a 240×240 resolution and approximately 32.4 mm diameter.<br />
* The CST816S touch controller communicates via the I2C bus protocol.<br />
* The GC9A01A display driver is controlled through an SPI interface.<br />
* The QMI8658 IMU measures acceleration from ±2 to ±16 g and rotational speed up to ±2048 °/s.<br />
* A lithium battery header (MX1.25) supports charging and discharging for portable use.<br />
* Six GPIO pins are accessible through an SH1.0 connector.<br />
* The board supports USB host and device modes, as well as mass-storage drag-and-drop flashing.<br />
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== Notes and version constraints ==<br />
* Touch sensitivity and accuracy decrease at the edges of the circular touchscreen due to its physical structure.<br />
* When flashing firmware over USB, hold the BOOT button while connecting the board to the computer.<br />
* CMake files must not contain Chinese characters (including comments), or project import may fail during C/C++ development.<br />
* Compatibility of specific battery types with the MX1.25 connector should be verified before purchase.<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/RP2040-Touch-LCD-1.28 RP2040-Touch-LCD-1.28 - Waveshare Wiki]<br />
* Source revision: 110666<br />
* Captured: 2026-09-04T04:28:00+00:00<br />
* SHA-256: <code>6a0bd87c7080b282d1d4636bc64498fa24b99c0d61ed4b0880a3fa839cd33746</code></div>JWTechPublisher