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Update README.md

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@ -10,6 +10,8 @@ A ["Discussions"](https://github.com/Bodmer/TFT_eSPI/discussions) facility has b
tft.fillRectVGradient(x, y, w, h, color1, color2); tft.fillRectVGradient(x, y, w, h, color1, color2);
![Gradient](https://i.imgur.com/atR0DmP.png)
4. The RP2040 8 bit parallel interface uses the PIO. The PIO now manages the "setWindow" and "block fill" actions, releasing the processor for other tasks when areas of the screen are being filled with a colour. The PIO can optionally be used for SPI interface displays if #define RP2040_PIO_SPI is put in the setup file. Touch screens and pixel read operations are not supported when the PIO interface is used. 4. The RP2040 8 bit parallel interface uses the PIO. The PIO now manages the "setWindow" and "block fill" actions, releasing the processor for other tasks when areas of the screen are being filled with a colour. The PIO can optionally be used for SPI interface displays if #define RP2040_PIO_SPI is put in the setup file. Touch screens and pixel read operations are not supported when the PIO interface is used.
The RP2040 PIO features only work with [Earle Philhower's board package](https://github.com/earlephilhower/arduino-pico), NOT the Arduino Mbed version. The RP2040 PIO features only work with [Earle Philhower's board package](https://github.com/earlephilhower/arduino-pico), NOT the Arduino Mbed version.