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Reset the Elecrow's GT911 the way Elecrow's own V3.0 example does (0.2.96, firmware 0.2.82)
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The 2 ms reset of ESPHome's expander support (0.2.81) left the chip silent: "Calibration error" with the PCA9557
answering at 0x18. A component of smart_display's (elecrow_touch_reset.h, setup priority 700: after the I2C bus,
before the GT911 driver) writes the expander as Elecrow's V3.0 ESPHome example does: every pin an output and low,
20 ms, the reset released, 100 ms, the interrupt line back to an input. The driver's reset and interrupt pins are gone.
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Xandrossian
2026-09-21 13:30:41 -07:00
parent da28d19961
commit 4ec8c7a935
9 changed files with 96 additions and 36 deletions
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screen_manager/CHANGELOG.md
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## 0.2.96 (firmware 0.2.82)
The Elecrow's touch chip reset the way Elecrow does it.
- **Elecrow CrowPanel 7.0" V3.0: Elecrow's own reset sequence.** Firmware 0.2.81 reset the GT911 through ESPHome's expander support, a 2 ms pulse the chip ignored on the unit tested (its log still said `Calibration error`, with the PCA9557 answering at 0x18). The board file now runs the sequence of Elecrow's V3.0 ESPHome example, byte for byte, before the touch driver looks for the chip: every expander pin an output and low, 20 ms, the reset released, 100 ms, the interrupt line back to an input (`smart_display: elecrow_touch_reset`, components/smart_display/elecrow_touch_reset.h). The log says `GT911 reset through the PCA9557`, or that no expander answered (a V2.0 board, which boots its GT911 by the pull-up).
- Needs firmware 0.2.82 on an Elecrow: press **Update** on the screen. Elecrow firmware: 1,866,128 bytes, 91.9 % of its update slot.
## 0.2.95 (firmware 0.2.81)
The Elecrow's touch chip brought out of reset.