Add TTGO T Journal Camera module & improve commenting (espressif#3515)

Added pinout for TTGO T Journal device and improved the intent of comments.

libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino

@@ -2,16 +2,18 @@
 #include <WiFi.h>
 
 //
-// WARNING!!! Make sure that you have either selected ESP32 Wrover Module,
-// or another board which has PSRAM enabled
+// WARNING!!! PSRAM IC required for UXGA resolution and high JPEG quality
+// Ensure ESP32 Wrover Module or other board with PSRAM is selected
+// Partial images will be transmitted if image exceeds buffer size
 //
 
 // Select camera model
-#define CAMERA_MODEL_WROVER_KIT
-//#define CAMERA_MODEL_ESP_EYE
-//#define CAMERA_MODEL_M5STACK_PSRAM
-//#define CAMERA_MODEL_M5STACK_WIDE
-//#define CAMERA_MODEL_AI_THINKER
+#define CAMERA_MODEL_WROVER_KIT // Has PSRAM
+//#define CAMERA_MODEL_ESP_EYE // Has PSRAM
+//#define CAMERA_MODEL_M5STACK_PSRAM // Has PSRAM
+//#define CAMERA_MODEL_M5STACK_WIDE	// Has PSRAM
+//#define CAMERA_MODEL_AI_THINKER // Has PSRAM
+//#define CAMERA_MODEL_TTGO_T_JOURNAL // No PSRAM
 
 #include "camera_pins.h"
 
@@ -46,7 +48,9 @@ void setup() {
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
- //init with high specs to pre-allocate larger buffers
+
+ // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
+ // for larger pre-allocated frame buffer.
  if(psramFound()){
  config.frame_size = FRAMESIZE_UXGA;
  config.jpeg_quality = 10;
@@ -70,13 +74,13 @@ void setup() {
  }
 
  sensor_t * s = esp_camera_sensor_get();
- //initial sensors are flipped vertically and colors are a bit saturated
+ // initial sensors are flipped vertically and colors are a bit saturated
  if (s->id.PID == OV3660_PID) {
- s->set_vflip(s, 1);//flip it back
- s->set_brightness(s, 1);//up the blightness just a bit
- s->set_saturation(s, -2);//lower the saturation
+ s->set_vflip(s, 1); // flip it back
+ s->set_brightness(s, 1); // up the brightness just a bit
+ s->set_saturation(s, -2); // lower the saturation
  }
- //drop down frame size for higher initial frame rate
+ // drop down frame size for higher initial frame rate
  s->set_framesize(s, FRAMESIZE_QVGA);
 
 #if defined(CAMERA_MODEL_M5STACK_WIDE)

libraries/ESP32/examples/Camera/CameraWebServer/camera_pins.h

@@ -94,6 +94,25 @@
 #define HREF_GPIO_NUM 23
 #define PCLK_GPIO_NUM 22
 
+#elif defined(CAMERA_MODEL_TTGO_T_JOURNAL)
+#define PWDN_GPIO_NUM 0
+#define RESET_GPIO_NUM 15
+#define XCLK_GPIO_NUM 27
+#define SIOD_GPIO_NUM 25
+#define SIOC_GPIO_NUM 23
+
+#define Y9_GPIO_NUM 19
+#define Y8_GPIO_NUM 36
+#define Y7_GPIO_NUM 18
+#define Y6_GPIO_NUM 39
+#define Y5_GPIO_NUM 5
+#define Y4_GPIO_NUM 34
+#define Y3_GPIO_NUM 35
+#define Y2_GPIO_NUM 17
+#define VSYNC_GPIO_NUM 22
+#define HREF_GPIO_NUM 26
+#define PCLK_GPIO_NUM 21
+
 #else
 #error "Camera model not selected"
 #endif