I2cScanModule

Source: I2cScanModule.h

I2cScanModule¶

class I2cScanModule

src/core/system/I2cScanModule.h:33

Inherits: MoonModule

Scan an I2C bus and report which addresses answer, the standard detect operation in the UI.

It is the bring-up tool for any I2C peripheral: set the pins, press scan, read what is there. A fixed System module, wired by code, and passive until the button is pressed.

I2cScanModule card

Public Methods¶

virtual inline void defineControls() override : Declare the two bus pins, the scan button and the result readout.

virtual inline void onControlChanged(const char * controlName) override : Run a scan when the button is pressed.

More info¶

How it probes¶

The platform opens a temporary bus, probes every 7-bit address, and tears it down. Its own short-lived bus means a scan never conflicts with one another driver owns. A target without a bus reports as unavailable rather than as an empty scan.

The pins¶

They default to unused, so a board with no I2C device claims no GPIO for the scanner. A board with a fixed bus sets them from its catalog entry. For an ad-hoc scan the user types them, the conventional pair being 21 and 22.

Prior art: the scan mirrors MoonLight's, and the probe range follows Linux i2c-tools.