# Bluepill USB-I2C gateway

## Hardware

This is a firmware for STM32F103R8T6 Bluepill.

## Customization

The project can be customized using STM32CubeMX.

there's some changes in the i2c HAL driver, careful!

line 6364

```
  // HACK - ignore HAL_I2C_ERROR_AF
  if (hi2c->ErrorCode != HAL_I2C_ERROR_NONE && hi2c->ErrorCode != HAL_I2C_ERROR_AF)
```

this allows receiving frames of unknown length

## Building & programming

use the makefile and flash using a st-link dongle.

Requires: Make, arm-none-eabi-gcc, st-flash

```
make -j
make flash
```