修复背景灯不亮的问题

apps/kaotings/kt.c

@@ -129,6 +129,16 @@ void kt_set_ex_led_color(u8 color)
 
 void ex_led_init(void)
 {
+    gpio_set_pull_up(CFG_EX_RLED_PIN, 0);
+    gpio_set_pull_down(CFG_EX_RLED_PIN, 0);
+    gpio_set_direction(CFG_EX_RLED_PIN, 0);
+    gpio_set_pull_up(CFG_EX_GLED_PIN, 0);
+    gpio_set_pull_down(CFG_EX_GLED_PIN, 0);
+    gpio_set_direction(CFG_EX_GLED_PIN, 0);
+    gpio_set_pull_up(CFG_EX_BLED_PIN, 0);
+    gpio_set_pull_down(CFG_EX_BLED_PIN, 0);
+    gpio_set_direction(CFG_EX_BLED_PIN, 0);
+    
     R_LED_OFF();
     G_LED_OFF();
     B_LED_OFF();
@@ -145,6 +155,7 @@ void ex_led_init(void)
 
 void kt_init(void)
 {
+    ex_led_init();
     lcd_st7789_init();
     eye_led_init();
     eye_led_set_complete_callback(eye_led_complete_cb);