TFT_SPI compatibility with read/write to Serial UART on RP2040

[SWills73]

Hi, looking for some community help after spending days trying to resolve and going nuts in the process.

I have a Feather RP2040 with an ST7789 display using TFT_eSPI and want to read data from a Serial port and Deserialize with ArduinoJSON.

The TFT_eSPI works with the display (Perfect!), and I've had the read/write serial stream working, - but not at the same time. As soon as I send data to the display, the Serial data stream cuts out.

I've tried to ensure I don't have conflicting PINS, but need to help to understand if this is the issue.

TFT_eSPI User_Setup File:
#define ST7789_DRIVER
#define TFT_MOSI 19
#define TFT_SCLK 18
#define TFT_CS 13 // Chip select control pin
#define TFT_DC 12 // Data Command control pin
#define TFT_RST 11 // Reset pin (could connect to Arduino RESET pin)
#define RP2040_PIO_SPI

Feather RP2040 Pin Setup (using the Earle Philhower arduino-pico core)
Serial2.setRX(25);
Serial2.setTX(24);

Serial2.begin(57600); // initialise serial interface

What Works:

1. TFT_eSPI with ST7789 IPS display
2. Data streaming when not sending anything to the display in the program loop

Failure Mode:

• conflict of TFT_eSPI setup with the Serial streaming port
• I've tried various Serial RX/TX pins - including 28&29 (TX0/RX0) and 24&25 (TX1/RX1)- I can get the stream to work and deserialize but not with the display output

Struggling to understand the conflict of TFT_eSPI which prevents a correct data stream on Serial

[SWills73]

Fixed - I was pushing the TFT_eSPI display update too often so it was blocking the Serial stream; I put a 250ms minimum timer on display updates and it allows the Serial UART to do its thing.