PicoQVGA - Minimalistic QVGA Display on Raspberry Pico ------------------------------------------------------ Miroslav Nemecek, panda38.sweb.cz, Panda38@seznam.cz Resolution: 320x240 pixels, 8 bits Description and tutorial to PIO and DMA: view "_www" subdirectory or http://www.breatharian.eu/hw/picoqvga/index_en.html How to install: - Install compiler gcc-arm-none-eabi-10-2020 into folder C:\ARM10 - Unpack this package into some folder If you have gcc compiler installed in another folder, edit PATH in files _c1.bat and _boot2\c.bat I recommend FAR Manager as program editor - it contains very useful console output. To compile demo project, run c.bat (or c_all.bat to compile all). To clear demo project, run d.bat (or d_all.bat to clear all). To write demo project to the Pico board: - press and hold BOOTSEL button on the Pico board - connect USB cable - release BOOTSEL button - edit destination drive (now there is r:) in file _e1.bat, command: copy /b program.uf2 r: and then run e.bat ... or drag and drop file 'program.uf2' to Pico drive. How to connect VGA display -------------------------- GP2 ... QVGA B0 ... resistor 1K0 to Blue output GP3 ... QVGA B1 ... resistor 390 to Blue output GP4 ... QVGA G0 ... resistor 2K2 to Green output GP5 ... QVGA G1 ... resistor 1K0 to Green output GP6 ... QVGA G2 ... resistor 470 to Green output GP7 ... QVGA R0 ... resistor 2K2 to Red output GP8 ... QVGA R1 ... resistor 1K0 to Red output GP9 ... QVGA R2 ... resistor 470 to Red output GP10 ... QVGA HSYNC synchronization ... resistor 100 to HSYNC GP11 ... QVGA VSYNC synchronization ... resistor 100 to VSYNC GP0 ... PWM sound output (RC LOW filter 1K5 resistor + 10n capacitor) How to connect Pico to PC with serial port ------------------------------------------ Most demo projects are prepared to control via USB serial port adapter. USB interface is selected in Makefile with this parameter: DEFINE += -DPICO_STDIO_USB=1 Instead of it, you can use serial port. Change Makefile parameter to: DEFINE += -DPICO_STDIO_UART=1 To connect Pico to PC via serial port, you need either convertor from RS232 COM port from 3.3V levels of Pico board, or you need convertor to USB port. Good choise is USB-serial adaptor PL2303TA. How to connect UART to Pico: +---USB---+ <-- UART0_TX GP0 |.1 40.|VBUS --- +5V power output to USB device --> UART0_RX GP1 |.2 39.|VSYS ---|<|--- +5V power input --- GND |.3 38.| GND K diode A GP2 |.4 37.| 3V3_EN GP3 |.5 36.| 3V3_OUT ...... Note: in simple case, you need not diode, you can connect +5V directly on board. connect USB/UART adaptor PL2303TA: red ......... +5V VSYS (39) black ....... GND (3) white RxD ... UART0_TX GP0 (1) green TxD ... UART0_RX GP1 (2) You need console program (as PuTTY) to see demo text. Setup port to 115200 Baud, 8 bits, 1 stop bit, no parity, flow control None. In Device Manager, USB adaptor can be found under name: "Prolific USB-to-Serial Comm Port (COM10)". PicoQVGA examples ---------------- Balloons - back buffer demo, floating balloons Draw - draw graphics demo Earth - rotating Earth globe Eggs - game of Eggs+Chickens+Hens, variant of the Reversi game keyboard control: 'L' right, 'I' up, 'J' left, 'K' down, 'H' help, 'Q' quit, 'P' 2 players, 'D' demo, space stone, Enter ok Fifteen - game keyboard control: 'L' right, 'I' up, 'J' left, 'K' down, 'Q' new game Flag - animation of flag fluttering in the wind Hello - simple demonstration, print text "Hello world!" on the screen Hypno - hypnotizing rotating pattern Life - game, reproducing cells keyboard control: 'L' right, 'I' up, 'J' left, 'K' down, 'C' copy, 'V' paste, 'D' clear, space flip state, Enter run life, 0..9 select slot Lines - moving line patterns Mandelbrot - fractal pattern generator keyboard control: 'E' up, 'S' left, 'D' right, 'X' down, 'Q' zoom in, 'A' zoom out, 'I' integer arithmetics, 'F' float arithmetics, 'B' double arithmetics, 'O' decrease number of steps, 'P' increase number of steps, space redraw Matrix Rain - simulation of Matrix code rain Maze - game, simple maze with maze generator keyboard control: 'J' left, 'I' up, 'L' right, 'K' down, 'H' help (show door) Monoscope - test of graphic mode Pi - calculate Pi at 4800 digits Pixels - random pixels Raytrace - ray tracing 3D demonstration of mirror spheres Spheres - draw random spheres Spots - draw random dot spots Twister - deformable block covered with 4 textures Water surface - simulation of a rippling water surface