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To connect the RP2040 microcontroller (U1) to the Adafruit SPI TFT LCD Display Touch ILI9341 (U2), you'll need to connect the SPI interface, the display control signals, and the power supply. Here's a suggested connection list:
SPI interface:
U1.GPIO12 (SPI0_MISO) ⟶ U2.MISO
U1.GPIO11 (SPI0_SCK) ⟶ U2.SCK
U1.GPIO10 (SPI0_MOSI) ⟶ U2.MOSI
Display control signals:
U1.GPIO9 ⟶ U2.D/C
U1.GPIO8 ⟶ U2.RESET
U1.GPIO7 ⟶ U2.CS
Touchscreen SPI interface (optional, if you want to use the touchscreen feature):
U1.GPIO6 ⟶ U2.T_CS
U1.GPIO11 (SPI0_SCK) ⟶ U2.T_CLK
U1.GPIO10 (SPI0_MOSI) ⟶ U2.T_DIN
U1.GPIO12 (SPI0_MISO) ⟶ U2.T_DO
U1.GPIO5 ⟶ U2.T_IRQ
Power supply:
Connect a 3.3V power source to U2.VCC and U1.IOVDD.
Connect GND to both U1.GND and U2.GND.
For the LED backlight, connect U2.LED to a 3.3V power source through a current-limiting resistor (typically 100 Ohm to 150 Ohm).
Note: This connection list assumes you're using SPI0 of the RP2040. You can choose other GPIO pins for the display control signals and touchscreen SPI interface if needed, but make sure to update your software accordingly.
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U1.GPIO12
(SPI0_MISO) ⟶U2.MISO
U1.GPIO11
(SPI0_SCK) ⟶U2.SCK
U1.GPIO10
(SPI0_MOSI) ⟶U2.MOSI
U1.GPIO9
⟶U2.D/C
U1.GPIO8
⟶U2.RESET
U1.GPIO7
⟶U2.CS
U1.GPIO6
⟶U2.T_CS
U1.GPIO11
(SPI0_SCK) ⟶U2.T_CLK
U1.GPIO10
(SPI0_MOSI) ⟶U2.T_DIN
U1.GPIO12
(SPI0_MISO) ⟶U2.T_DO
U1.GPIO5
⟶U2.T_IRQ
U2.VCC
andU1.IOVDD
.U1.GND
andU2.GND
.U2.LED
to a 3.3V power source through a current-limiting resistor (typically 100 Ohm to 150 Ohm).