PicoCamRgb

A Scene for RP2040, Camera, RGB-OLED and three 'Pi-Cach-Yus'

Three big legends and their tiny likenesses

Links

project with monochrome OLED
https://github.com/qrti/picoCam

Options (Overlay Display)

- brightness, contrast
- night vision
- rotate 0-90-180-270 degrees
- vertical-flip, horizontal-flip
- options are stored to flash

Keys

- option:    short = next option, double = previous option
- plus:      next value
- minus:     previous value

Remarks

- camera OV7725 no fifo version (without RAM on PCB) is used for this project
- if the picture is distorted reduce OLED_SPIFREQ in oled.h 
  or reduce/raise SYS_CLK_DIV in camData.h
- night vision might not switch off properly, reason unknown
- attached python scripts invoke the RP2040 assembler on .pio file changes when compiling
  see platform.ini, pre_script.py and post_script.py
- commented out quart.h is for simple debugging with printf on serial TX (pin 1), RX (pin 2)

Schematic

Software Structure

           ____ main ____
         /         \      \ 
      cam         oled      keys
     /   \          |        |
camCtrl  camData   text    option

core 0
cam data    -> PIO -> DMA -> line buffer -> video buffer
RGB 565                      480x2 byte     128x128x2 byte
480x480 pix                  1 line         128 lines
    
-> VSYNC IR -> reset line counter
-> HREF IR  -> advance line counter, start DMA
-> 10 ms key polling routine for options

core 1
line buffer       -> video buffer  -> SPI   -> OLED display
128x2 byte       |   128x128x2 byte   30 MHz   128x128 pix RGB
                 |
option overlay ->