Configuration

Informative

A worked I2C channel configuration. The full property tables are in Configuration Reference; the binding rule is CHI-I2C-MUST-23.

Controller and target channels

Each channel is configured as either a controller or a target — the node_type selects which properties apply.

general:
  enable_development_error_reporting: true

config_set:
  - config_set_name: "I2cCfg"
    channel:
      - node_type: "Controller"
        channel_id: 0
        hw_channel: 0
        event_handling_mode: "Interrupt"       # or "Polling"
        clock_divider: 16                       # derives the SCL bitrate
      - node_type: "Target"
        channel_id: 1
        hw_channel: 1
        event_handling_mode: "Polling"
        device_address: 0x42                    # this target's 7-bit address [0, 127]
        default_data: 0xFF                      # sent when the controller over-reads

Notes

• Controller vs target properties differ. A controller channel has clock_divider; a target channel has device_address and default_data.

• 7-bit addresses only — device_address is in [0, 127].

• Event handling is per channel. With Polling you must call I2c_PollFunction cyclically; with Interrupt the driver services events in I2c_Interrupt.