Ken Van Hoeylandt
46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
#include "Detect.h"
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#include <tactility/device.h>
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#include <tactility/drivers/i2c_controller.h>
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#include <tactility/log.h>
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#include <esp_lcd_touch_gt911.h>
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#include <esp_lcd_touch_st7123.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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constexpr auto* TAG = "Tab5Detect";
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Tab5Variant detectVariant() {
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// Allow time for touch IC to fully boot after expander reset in initBoot().
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// 100ms is enough for I2C ACK (probe) but cold power-on needs ~300ms before
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// register reads (read_fw_info) succeed reliably.
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vTaskDelay(pdMS_TO_TICKS(300));
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auto* i2c0 = device_find_by_name("i2c0");
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check(i2c0);
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constexpr auto PROBE_TIMEOUT = pdMS_TO_TICKS(50);
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for (int attempt = 0; attempt < 3; ++attempt) {
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// GT911 address depends on INT pin state during reset:
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// GPIO 23 has a pull-up resistor to 3V3, so INT is high at reset → GT911 uses 0x5D (primary)
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// It may also appear at 0x14 (backup) if the pin happened to be driven low
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if (i2c_controller_has_device_at_address(i2c0, ESP_LCD_TOUCH_IO_I2C_GT911_ADDRESS, PROBE_TIMEOUT) == ERROR_NONE ||
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i2c_controller_has_device_at_address(i2c0, ESP_LCD_TOUCH_IO_I2C_GT911_ADDRESS_BACKUP, PROBE_TIMEOUT) == ERROR_NONE) {
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LOG_I(TAG, "Detected GT911 touch — using ILI9881C display");
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return Tab5Variant::Ili9881c_Gt911;
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}
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// Probe for ST7123 touch (new variant)
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if (i2c_controller_has_device_at_address(i2c0, ESP_LCD_TOUCH_IO_I2C_ST7123_ADDRESS, PROBE_TIMEOUT) == ERROR_NONE) {
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LOG_I(TAG, "Detected ST7123 touch — using ST7123 display");
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return Tab5Variant::St7123;
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}
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vTaskDelay(pdMS_TO_TICKS(100));
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}
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LOG_W(TAG, "No known touch controller detected, defaulting to ST7123");
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return Tab5Variant::St7123;
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}
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