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I2C

In STM32CubeMX, you should enable the DMA channels for I2C and configure the necessary interrupt settings.

Example​

The last parameter specifies the minimum number of bytes to trigger DMA transfer. If the data size is below this threshold, DMA will not be used.

STM32I2C i2c1(&hi2c1, i2c1_buf, 3);

Configuration File​

After code generation, an I2C configuration section will appear in the User/libxr_config.yaml file, formatted as follows:

I2C:
  i2c1:
    buffer_size: 32
    dma_enable_min_size: 3
  • buffer_size: Size of the I2C transmission/reception buffer.
  • dma_enable_min_size: Minimum data size required to enable DMA transfer.

You can directly modify this file. To apply the updated configuration, run one of the following commands to regenerate the code:
xr_cubemx_cfg -d .
or
xr_gen_code_stm32 -i ./.config.yaml -o ./User/app_main.cpp