Fix backlight duty validation and update error messages for CST816S touch controller

Author: rzeldent

boards

@@ -51,10 +51,12 @@ void smartdisplay_lcd_set_backlight(float duty)
 {
   log_v("duty:%2f", duty);
 
-  if (duty > 1.0f)
-    duty = 1.0f;
-  if (duty < 0.0f)
-    duty = 0.0f;
+  if (duty < 0.0f || duty > 1.0f || isnan(duty))
+  {
+    log_e("Invalid duty value: %f", duty);
+    return;
+  }
+
 #if ESP_ARDUINO_VERSION_MAJOR >= 3
   ledcWrite(DISPLAY_BCKL, duty * PWM_MAX_BCKL);
 #else

src/esp32_smartdisplay.c

@@ -268,15 +268,15 @@ esp_err_t esp_lcd_touch_new_i2c_cst816s(const esp_lcd_panel_io_handle_t io, cons
     // Reset controller
     if ((res = cst816s_reset(th)) != ESP_OK)
     {
-        log_e("GT911 reset failed");
+        log_e("CST826S reset failed");
         cst816s_del(th);
         return res;
     }
 
     // Read type and resolution
     if ((res = cst816s_read_info(th)) != ESP_OK)
     {
-        log_e("GT911 read info failed");
+        log_e("CST826S read info failed");
         cst816s_del(th);
         return res;
     }