Raspberry Pico Wifi Painter

A Raspberry Pico RP2040 and ILI9341 based painter drawing live updates to and from any other online Pico.

Forked from this excellent Pocket Gaming project

Case printed from this Printables model

Short demo video

Hardware

Required components:

• Raspberry Pico W (RP2040)
• ILI9341 controller with XPT2046 touch module (any size at or below 510x510 pixel resolution)

How to compile/run ?

git clone git@github.com:raspberrypi/pico-sdk.git
cd pico-sdk
git submodule update --init

# modify ./lib/lwip/src/include/lwip/opt.h:509
# FROM:      #define MEMP_NUM_SYS_TIMEOUT            LWIP_NUM_SYS_TIMEOUT_INTERNAL
# TO:        #define MEMP_NUM_SYS_TIMEOUT            (LWIP_NUM_SYS_TIMEOUT_INTERNAL+1)
# until this issue is resolved: https://github.com/raspberrypi/pico-sdk/issues/1281

git clone git@github.com:jumbub/pico-to-pico.git
cd pico-to-pico
mkdir build
cd build
PICO_SDK_PATH=../../pico-sdk cmake -DPICO_BOARD=pico_w -DWIFI_SSID="ssid" -DWIFI_PASSWORD="password" -DMQTT_CLIENT="picow-1234" -DMQTT_TOPIC="draw-app-1234" ..
make

Debugging

git clone https://github.com/raspberrypi/openocd.git
./bootstrap
./configure --enable-ftdi --enable-sysfsgpio --enable-bcm2835gpio
src/openocd -f interface/cmsis-dap.cfg -f target/rp2040.cfg -s tcl -c "adapter speed 5000"

gdb-multiarch main.elf
target extended-remote :3333
(gdb) load # loads application
(gdb) monitor reset init # restart pico
(gdb) continue # run

After which you should be able to find build/pico-to-pico.uf2 file to upload to your Pico microcontroller.

Pinout

You should be able to find a compressed gerber file with extras directory of the repository and order a new PCB online on which you can solder all the elements easily.

ILI9341 to Pico pin connections looks like this:

 ILI9341         Pico (RP2040)

 T_IRQ  <-----> PIN 20
 T_DO   <-----> PIN 8
 T_DIN  <-----> PIN 11
 T_CS   <-----> PIN 21
 T_CLK  <-----> PIN 10
 SDO    <-----> PIN 4
 LED    <-----> PIN 26 (or directly to 3v3)
 SCK    <-----> PIN 6
 SDI    <-----> PIN 7
 DC     <-----> PIN 18
 RESET  <-----> PIN 17
 CS     <-----> PIN 16
 GND    <-----> GND
 VCC    <-----> 3V3

In case you need to change them they are all defined within their own source files: src/interface.c, src/interface/ili9341.c and src/interface/ili9341_touchscreen.c.