Revert "camera 优化：在原有的RGB565处理下，容易超时改为JPEG格式 (#1029)" (#1085)

This reverts commit d6b1414967.

main/boards/bread-compact-wifi-s3cam/compact_wifi_board_s3cam.cc

@@ -158,9 +158,9 @@ private:
         config.pin_pwdn = CAMERA_PIN_PWDN;
         config.pin_reset = CAMERA_PIN_RESET;
         config.xclk_freq_hz = XCLK_FREQ_HZ;
-        config.pixel_format = PIXFORMAT_JPEG;
+        config.pixel_format = PIXFORMAT_RGB565;
         config.frame_size = FRAMESIZE_QVGA;
-        config.jpeg_quality = 10;
+        config.jpeg_quality = 12;
         config.fb_count = 1;
         config.fb_location = CAMERA_FB_IN_PSRAM;
         config.grab_mode = CAMERA_GRAB_WHEN_EMPTY;

main/boards/bread-compact-wifi-s3cam/config.h

@@ -51,7 +51,7 @@
 #define CAMERA_PIN_SIOD GPIO_NUM_4
 #define CAMERA_PIN_PWDN GPIO_NUM_NC
 #define CAMERA_PIN_RESET GPIO_NUM_NC
-#define XCLK_FREQ_HZ 50000000
+#define XCLK_FREQ_HZ 20000000
 
 
 #define DISPLAY_BACKLIGHT_PIN GPIO_NUM_38