I2C Implementation (#84)

Boards/LilygoTdeck/InitPower.cpp

@@ -0,0 +1,46 @@
+#include "config.h"
+#include "TactilityCore.h"
+
+#define TAG "tdeck"
+
+static bool tdeck_power_on() {
+    gpio_config_t device_power_signal_config = {
+        .pin_bit_mask = BIT64(TDECK_POWERON_GPIO),
+        .mode = GPIO_MODE_OUTPUT,
+        .pull_up_en = GPIO_PULLUP_DISABLE,
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .intr_type = GPIO_INTR_DISABLE,
+    };
+
+    if (gpio_config(&device_power_signal_config) != ESP_OK) {
+        return false;
+    }
+
+    if (gpio_set_level(TDECK_POWERON_GPIO, 1) != ESP_OK) {
+        return false;
+    }
+
+    return true;
+}
+
+bool tdeck_init_power() {
+    ESP_LOGI(TAG, "Power on");
+    if (!tdeck_power_on()) {
+        TT_LOG_E(TAG, "Power on failed");
+        return false;
+    }
+
+    /**
+     * Without this delay, the touch driver randomly fails when the device is USB-powered:
+     *  > lcd_panel.io.i2c: panel_io_i2c_rx_buffer(135): i2c transaction failed
+     *  > GT911: touch_gt911_read_cfg(352): GT911 read error!
+     * This might not be a problem with a lipo, but I haven't been able to test that.
+     * I tried to solve it just like I did with the keyboard:
+     * By reading from I2C until it succeeds and to then init the driver.
+     * It doesn't work, because it never recovers from the error.
+     */
+    TT_LOG_I(TAG, "Waiting after power-on");
+    tt::delay_ms(TDECK_POWERON_DELAY);
+
+    return true;
+}