Xandrossian
a3ef7f09a1
The GT911 of the CrowPanel 7.0" sits on GPIO 19 and 20, the ESP32-S3's USB pins. Firmware 0.2.79 freed them once, in a static constructor; the Wi-Fi PHY library then kept the USB PHY on (CONFIG_ESP_PHY_ENABLE_USB, on by default on an ESP32-S3) and the touch went quiet once Wi-Fi came up. The board file turns that option off, frees the pins again in BOOT_TOUCH after Wi-Fi started, and a one-second watchdog frees them whenever anything takes them, with a log line.
42 lines
2.4 KiB
C++
42 lines
2.4 KiB
C++
#pragma once
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// The Elecrow CrowPanel 7.0" wires its GT911 touch I2C to GPIO19 and GPIO20, the ESP32-S3's USB D- and D+. The ROM
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// leaves the USB_SERIAL_JTAG PHY on those pads, and ESP-IDF's I2C driver cannot take them back: the bus reads as
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// "I2C software timeout" and the touch never answers (esphome/esphome#15356, ESPHome 2026.3+). release_usb_pads() lets
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// the pads go: the PHY drops them, and both become plain GPIOs with their pull-ups, as the I2C driver expects to find
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// them. The board's USB-C port is a CH340 on UART0, so nothing is lost.
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//
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// It runs three times, because three things hand the pads back to the PHY: once before any ESPHome component (a
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// static constructor at priority 101, after the ROM), once in the board's BOOT_TOUCH hook (the core's on_boot at
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// priority -100, after Wi-Fi started: the Wi-Fi PHY library keeps the USB PHY unless CONFIG_ESP_PHY_ENABLE_USB is
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// off, which the board file sets as well), and from a one-second interval that reads the pad bit and releases the pads
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// again when anything took them (ESPHome's logger keeps the USB-Serial-JTAG secondary console, and a Wi-Fi restart
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// re-enables the PHY). The interval logs once per event, so the log says whether it ever had to.
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//
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// ESPHome includes every header of the component in every build, so the code is behind a flag only the Elecrow's board
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// file sets (`-DESP_SCREENS_FREE_USB_PADS=1`, packages/boards/elecrow-crowpanel7.yaml): the CYD has no such peripheral,
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// and the Guition, an ESP32-S3 too, keeps its USB.
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#if defined(ESP_SCREENS_FREE_USB_PADS) && ESP_SCREENS_FREE_USB_PADS
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#include "hal/usb_serial_jtag_ll.h"
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#include "soc/io_mux_reg.h"
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#include "soc/usb_serial_jtag_reg.h"
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namespace elecrow {
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// True while the USB PHY holds GPIO19 and GPIO20.
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inline bool usb_pads_taken() { return REG_GET_BIT(USB_SERIAL_JTAG_CONF0_REG, USB_SERIAL_JTAG_USB_PAD_ENABLE) != 0; }
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inline void release_usb_pads() {
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usb_serial_jtag_ll_phy_enable_pad(false);
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CLEAR_PERI_REG_MASK(USB_SERIAL_JTAG_CONF0_REG, USB_SERIAL_JTAG_USB_PAD_ENABLE);
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CLEAR_PERI_REG_MASK(USB_SERIAL_JTAG_CONF0_REG, USB_SERIAL_JTAG_DP_PULLUP);
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for (uint32_t reg : {IO_MUX_GPIO19_REG, IO_MUX_GPIO20_REG}) {
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PIN_FUNC_SELECT(reg, PIN_FUNC_GPIO);
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PIN_INPUT_ENABLE(reg);
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REG_SET_BIT(reg, FUN_PU);
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REG_CLR_BIT(reg, FUN_PD);
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}
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}
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static __attribute__((constructor(101))) void release_usb_pads_early() { release_usb_pads(); }
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} // namespace elecrow
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#endif
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