firmware+controller: Initial working HID state control

firmware/main/ui.c

@@ -280,7 +280,5 @@ void val_lvgl_ui(lv_display_t *disp) {
   lv_label_set_text(l_cfg, LV_SYMBOL_SETTINGS);
   lv_obj_center(l_cfg);
 
-  // val_ui_none();
-  // val_ui_menu(true);
-  val_ui_idle();
+  val_ui_none();
 }

firmware/main/usb.c

@@ -8,6 +8,7 @@
 #include "common.h"
 #include "usb.h"
 #include "lcd.h"
+#include "ui.h"
 
 #define TUSB_DESC_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_HID_INOUT_DESC_LEN)
 
@@ -77,24 +78,55 @@ uint8_t const *tud_hid_descriptor_report_cb(uint8_t instance) {
 // 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) {
+uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t* buf, uint16_t reqlen) {
     (void) instance;
-    (void) report_id;
-    (void) report_type;
-    (void) buffer;
-    (void) reqlen;
+    if (report_id != 0 || reqlen < 1) {
+      return 0;
+    }
 
-    return 0;
+    // ESP_LOGI(TAG, "Got %hu bytes report %hhu", reqlen, report_id);
+    // for (uint16_t i = 0; i < reqlen; i++) {
+    //   ESP_LOGI(TAG, "b: %02hhx", buf[i]);
+    // }
+    buf[0] = val_ui_state_ready();
+    return 1;
 }
 
 // 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) {
-  assert(report_id == 0 && report_type == HID_REPORT_TYPE_OUTPUT);
-  ESP_LOGI(TAG, "Got %hu bytes report %hhu", bufsize, report_id);
-  for (uint16_t i = 0; i < bufsize; i++) {
-    ESP_LOGI(TAG, "b: %02hhx", buffer[i]);
+void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buf, uint16_t bufsize) {
+  (void) instance;
+  assert(report_id == 0 && report_type == HID_REPORT_TYPE_OUTPUT && bufsize >= 1);
+  if (!val_lvgl_lock(-1)) {
+    ESP_LOGE(TAG, "Failed to grab LVGL lock");
+    return;
   }
+  if (buf[0] > ST_IDLE) {
+    ESP_LOGW(TAG, "Unknown state %hhu", buf[0]);
+    goto ret;
+  }
+  if (!val_ui_state_ready()) {
+    goto ret;
+  }
+
+  switch (buf[0]) {
+  case ST_NONE:
+    val_ui_none();
+    break;
+  case ST_MENU:
+    if (bufsize < 2) {
+      ESP_LOGE(TAG, "Invalid ST_MENU command");
+      goto ret;
+    }
+    val_ui_menu((bool)buf[1]);
+    break;
+  case ST_IDLE:
+    val_ui_idle();
+    break;
+  }
+
+ret:
+  val_lvgl_unlock();
 }
 
 void val_usb_init(void) {

firmware/main/usb.h

@@ -5,4 +5,10 @@
 #define EPNUM_HID 0x01
 #define USB_EP_BUFSIZE 64
 
+typedef enum val_state {
+  ST_NONE = 0,
+  ST_MENU,
+  ST_IDLE
+} val_state_t;
+
 void val_usb_init(void);