firmware+controller: Initial USB device

firmware/main/CMakeLists.txt

@@ -1,3 +1,3 @@
 idf_component_register(
-  SRCS "valconomy.c" "ui.c"
+  SRCS "valconomy.c" "ui.c" "usb.c"
   INCLUDE_DIRS ".")

firmware/main/idf_component.yml

@@ -1,5 +1,6 @@
 ## IDF Component Manager Manifest File
 dependencies:
+  espressif/esp_tinyusb: "^1.5.0"
   lvgl/lvgl: "^9.2.2"
   esp_lcd_touch_gt911: "^1.1.1"
   ## Required IDF version

firmware/main/usb.c

@@ -0,0 +1,116 @@
+#include <inttypes.h>
+
+#include "esp_log.h"
+#include "esp_mac.h"
+
+#include "tinyusb.h"
+#include "class/hid/hid_device.h"
+
+#define TUSB_DESC_TOTAL_LEN (TUD_CONFIG_DESC_LEN + CFG_TUD_HID * TUD_HID_DESC_LEN)
+
+static const char *TAG = "valconomy-usb";
+
+// See https://github.com/hathach/tinyusb/blob/cb22301f91f0465a5578be35d9be284657ddd31d/src/common/tusb_types.h#L331
+const tusb_desc_device_t val_usb_dev_descriptor = {
+  .bLength = sizeof(tusb_desc_device_t),
+  .bDescriptorType = TUSB_DESC_DEVICE,
+  // BCD-coded USB version (?)
+  .bcdUSB = 0x0200,
+
+  .bDeviceClass = 0x00,
+  .bDeviceSubClass = 0x00,
+  .bDeviceProtocol = 0x00,
+  .bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
+
+  .idVendor = 0x6969,
+  .idProduct = 0x0004,
+  // BCD-coded device version (0.1)
+  .bcdDevice = 0x0010,
+
+  // Indices of strings
+  .iManufacturer = 0x01,
+  .iProduct = 0x02,
+  .iSerialNumber = 0x03,
+
+  .bNumConfigurations = 0x01,
+};
+
+const uint8_t val_hid_report_descriptor[] = {
+  TUD_HID_REPORT_DESC_KEYBOARD(HID_REPORT_ID(HID_ITF_PROTOCOL_KEYBOARD)),
+};
+
+char val_dev_serial[13];
+const char* val_hid_string_descriptor[5] = {
+  // 0: is supported language is English (0x0409)
+  (char[]){0x09, 0x04},
+  // 1: Manufacturer
+  "/dev/player0",
+  // 2: Product
+  "Valorant Economy Helper",
+  // 3: Serials, should use chip ID
+  val_dev_serial,
+  // 4: HID
+  "Valconomy HID interface",
+};
+
+static const uint8_t val_hid_conf_descriptor[] = {
+  // Configuration number, interface count, string index, total length, attribute, power in mA
+  TUD_CONFIG_DESCRIPTOR(1, 1, 0, TUSB_DESC_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
+
+  // Interface number, string index, boot protocol, report descriptor len, EP In address, size & polling interval
+  TUD_HID_DESCRIPTOR(0, 4, false, sizeof(val_hid_report_descriptor), 0x81, 16, 10),
+};
+
+// TinyUSB callbacks
+
+// Invoked when received GET HID REPORT DESCRIPTOR request
+// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
+uint8_t const *tud_hid_descriptor_report_cb(uint8_t instance) {
+  // We use only one interface and one HID report descriptor, so we can ignore parameter 'instance'
+  return val_hid_report_descriptor;
+}
+
+// Invoked when received GET_REPORT control request
+// Application must fill buffer report's content and return its length.
+// Return zero will cause the stack to STALL request
+uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen) {
+    (void) instance;
+    (void) report_id;
+    (void) report_type;
+    (void) buffer;
+    (void) reqlen;
+
+    return 0;
+}
+
+// Invoked when received SET_REPORT control request or
+// received data on OUT endpoint ( Report ID = 0, Type = 0 )
+void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize) {}
+
+void val_usb_init(void) {
+  ESP_LOGI(TAG, "Initializing USB");
+
+  // Use MAC address for serial number
+  uint8_t mac[6] = { 0 };
+  ESP_ERROR_CHECK(esp_read_mac(mac, ESP_MAC_EFUSE_FACTORY));
+  snprintf(
+    val_dev_serial, sizeof(val_dev_serial),
+    "%02x%02x%02x%02x%02x%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+
+  const tinyusb_config_t cfg = {
+    .device_descriptor = &val_usb_dev_descriptor,
+    .string_descriptor = val_hid_string_descriptor,
+    .string_descriptor_count = sizeof(val_hid_string_descriptor) / sizeof(char *),
+    .external_phy = false,
+
+#if (TUD_OPT_HIGH_SPEED)
+     // HID configuration descriptor for full-speed and high-speed are the same
+    .fs_configuration_descriptor = val_hid_conf_descriptor,
+    .hs_configuration_descriptor = val_hid_conf_descriptor,
+    .qualifier_descriptor = NULL,
+#else
+    .configuration_descriptor = val_hid_conf_descriptor,
+#endif // TUD_OPT_HIGH_SPEED
+  };
+  ESP_ERROR_CHECK(tinyusb_driver_install(&cfg));
+}

firmware/main/valconomy.c

@@ -1,5 +1,4 @@
 #include <inttypes.h>
-#include <stdio.h>
 
 #include "sdkconfig.h"
 #include "freertos/FreeRTOS.h"
@@ -37,6 +36,7 @@ static i2c_master_dev_handle_t exio_cfg_handle, exio_o_handle;
 // LVGL library is not thread-safe, we will call LVGL APIs from different tasks, so use a mutex to protect it
 static SemaphoreHandle_t lvgl_mtx = NULL;
 
+extern void val_usb_init(void);
 extern void val_lvgl_ui(lv_display_t *disp);
 
 bool val_lvgl_lock(int timeout_ms) {
@@ -293,6 +293,8 @@ void val_setup_lvgl(esp_lcd_panel_handle_t lcd_panel, esp_lcd_touch_handle_t tou
 void app_main(void) {
   val_i2c_master_init();
 
+  val_usb_init();
+
   esp_lcd_panel_handle_t lcd_panel = val_setup_lcd();
   assert(lcd_panel);
   esp_lcd_touch_handle_t touch_panel = val_setup_touch();