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CY7C68013 I2C-Tiny-USB firmware

Brief

This is firmware to make from cy7c68013 a Linux I2C adapter, which is use, very simple and available in every kernel, driver I2C-Tiny-USB.

In original firmware has been used AVR ICS instead of Cypress FX2 chips, and could be found at https://github.com/harbaum/I2C-Tiny-USB (https://www.kreativitaet-trifft-technik.de/project/i2c-tiny-usb.html)

How to build

  1. Install required packages
    1. apt install sdcc i2c-tools python3-libusb1
    2. python3 -m pip install fx2
  2. Clone recursively this repo
    1. git clone --recurse-submodules https://github.com/intx82/fx2-i2c-tiny-usb
  3. Build original (open source https://github.com/whitequark/libfx2.git) FX2 SDK
    1. make -C libfx2/firmware
  4. Attach cy7c68013 board and build and load into RAM this firmware
    1. make -C src load
    2. (optional) If needed to use it standalone - could be used: python3 -m fx2.fx2tool -S libfx2/firmware/boot-cypress/boot-cypress.ihex program -f src/i2c-tiny-usb.ihex (be sure that you took off J4)
  5. Use I2C on Linux - more details in Linux kernel docs (https://www.kernel.org/doc/Documentation/i2c/)
    1. As simple example, could be used utilities from i2c-tools: sudo i2cdump -y -r 0-16 7 0x76 b (reads first 16 registers from device with 0x76 address)

Hardware

Right now, I2C pins are mapped to:

  • SDA - PA2
  • SCL - PA1

I2C pins could be remapped in [src/softi2c.c:13]

This firmware is using 'Software I2C', so speed is not as lightning, and equals near 70khz

Board

Board could be found on AliExpress: https://aliexpi.com/DNc2