touch_demo Directory Reference

Directory dependency graph for touch_demo:

Directories
	src

Detailed Description

Standalone GoodIX GT911 capacitive-touch bring-up (#122). The GT911 driver was previously only exercised inside ereader_ui, with no standalone example and no gate of its own.

ra8_touch_open() runs the real driver: it configures IIC_B channel 0, wakes the GT911 by reading back its product-id string, and clears the status byte. The app then polls ra8_touch_read() – statically bounded – for one touch frame and reports the first decoded contact.

The bring-up half is the deterministic, finger-free part: reaching the product-id check proves the whole ra8_touch -> IIC_B -> GT911 path came up, and it holds whether or not anything is touching the panel. Keying the automated check on that rather than on a decoded coordinate is what makes it stable on an unattended bench, where the contact count is legitimately zero.

On the bench the GT911 lives on the ereader carrier's I2C0 bus. Touch a finger to the panel and the banner reports that contact's panel-native coordinate; the driver is the same one ereader_ui uses.