2828dbe4ca
Fixes issues with #includes inherited from `configuration.h` when building for pioarduino. Aligns t5s3_epaper with other variants like t_deck_pro. Co-authored-by: Copilot <copilot@github.com> Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
40 lines
1.9 KiB
C++
40 lines
1.9 KiB
C++
// Pin-level early init only. All touch, backlight, and InkHUD code lives in
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// src/platform/extra_variants/t5s3_epaper/variant.cpp where PlatformIO's
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// library dependency finder can resolve headers like TouchDrvGT911.hpp.
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#include "variant.h"
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#include "Arduino.h"
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#include "pins_arduino.h"
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void earlyInitVariant()
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{
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pinMode(LORA_CS, OUTPUT);
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digitalWrite(LORA_CS, HIGH);
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pinMode(SDCARD_CS, OUTPUT);
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digitalWrite(SDCARD_CS, HIGH);
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pinMode(BOARD_BL_EN, OUTPUT);
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// Backlight ON at boot (active-HIGH). Full backlight state management
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// lives in src/platform/extra_variants/t5s3_epaper/variant.cpp.
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digitalWrite(BOARD_BL_EN, HIGH);
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// Program GT911 touch controller to I2C address 0x14 (GT911_SLAVE_ADDRESS_H) before
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// the I2C bus scan runs. GPIO3 (INT) defaults LOW on ESP32-S3 cold boot, which would
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// leave the GT911 at 0x5D (GT911_SLAVE_ADDRESS_L) — the same address as the SFA30
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// air quality sensor — causing a false-positive SFA30 detection during the I2C scan.
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//
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// GT911 datasheet §4.3 "Address Selection":
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// Pull INT HIGH before releasing RST → device latches address 0x14 (SLAVE_ADDRESS_H)
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// Pull INT LOW before releasing RST → device latches address 0x5D (SLAVE_ADDRESS_L)
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// Minimum RST assert time: 100 µs; minimum startup time after RST deassert: 5 ms.
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//
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// lateInitVariant() calls touch.begin() which repeats this sequence internally while
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// also performing full I2C initialisation; the double-reset is harmless.
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pinMode(GT911_PIN_RST, OUTPUT);
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digitalWrite(GT911_PIN_RST, LOW);
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pinMode(GT911_PIN_INT, OUTPUT);
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digitalWrite(GT911_PIN_INT, HIGH); // HIGH → latch address 0x14
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delay(1); // > 100 µs
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digitalWrite(GT911_PIN_RST, HIGH);
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delay(10); // > 5 ms startup
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pinMode(GT911_PIN_INT, INPUT); // release INT for interrupt use
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}
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