BareMetalCamera is a from-scratch OV5640 bring-up on the RP2040 using PIO and DMA, with no vendor camera drivers. It recreates a DCMI-style parallel camera interface entirely in software.
This is an educational project focused on low-level embedded systems. The goal is to build a camera interface from scratch: no libraries, no pre-existing drivers, and no dedicated camera peripheral. Just the RP2040 datasheet, the OV5640 datasheet, and a fair amount of register archaeology.
This project builds a DCMI-style interface on hardware that does not natively provide one, providing a hands-on way to understand parallel camera interfaces.
Why?
Camera sensors are a great stress test for embedded systems. Interfacing with one requires I2C configuration, clock generation, high-throughput parallel data capture, PIO state machines, DMA transfers, and careful timing across multiple clock domains.
Rather than relying on an existing library, the focus here is to understand the entire pipeline end-to-end by building it manually on the RP2040.
Successfully established communication with the OV5640 camera module.
- SCCB (I2C equivalent) communication with camera
- PWM XCLK generation (~31 MHz) operational
- Power sequencing (RESET and PWDN pins)
- Reading Chip ID registers
OV5640 SCCB test
Chip ID High Byte: 0x56
Chip ID Low Byte: 0x40
Chip ID: 0x5640
This confirms the Pico can talk to the camera and read its registers.
- Raspberry Pi Pico (RP2040)
- Waveshare OV5640 Camera Board (C)
Requires Pico SDK installed and configured.
cd BareMetalCamera
mkdir build && cd build
cmake ..
makeFlash BareMetalCamera.uf2 to your Pico.
- Verified SCCB/I2C communication
- Configure camera registers for basic operation
- Implement PIO state machine for parallel data capture
- Set up DMA for frame transfers
- Actually get an image out of this thing
This project focuses on low-level bring-up and understanding. It is not intended to be a polished or production-ready camera driver.
Higher-level abstractions, advanced image tuning, and broader hardware support are deliberately out of scope, though they may be explored in separate projects or future iterations.