Rotated the displayed image because camera is in the back of the TTGO

Author: joachimBurket

esp32/examples/ttgo_demo/main/app_screen.cpp

@@ -237,10 +237,8 @@ static UINT tjd_output(
             }
         }
 
-        // ESP_LOGI(TAG, "x1:%d y1:%d x2:%d y2:%d\n", dleft, dtop, dright, dbottom);
-        tft->transmitCmdData(LCD_CASET, MAKEWORD(dleft >> 8, dleft & 0xFF, dright >> 8, dright & 0xFF));
-        tft->transmitCmdData(LCD_PASET, MAKEWORD(dtop >> 8, dtop & 0xFF, dbottom >> 8, dbottom & 0xFF));
-        tft->transmitCmd(LCD_RAMWR); // write to RAM
+        //ESP_LOGI(TAG, "x1:%d x2:%d y1:%d y2:%d\n", dleft, dright, dtop, dbottom);
+        tft->setAddrWindow(dleft, dtop, dright, dbottom);
 
         uint16_t *p = (uint16_t *)malloc(sizeof(uint16_t) * len);
         if (!p) {
@@ -250,7 +248,7 @@ static UINT tjd_output(
         for (uint32_t i = 0; i < len; i++) {
             p[i] = tft->color565(dev->linbuf[dev->linbuf_idx][i].r, dev->linbuf[dev->linbuf_idx][i].g, dev->linbuf[dev->linbuf_idx][i].b);
         }
-        tft->_fastSendBuf(p, len);
+        tft->_fastSendBuf(p, len, true);        // TODO: Swapping bytes directly in the camera register could enhance display
         free(p);
 
         dev->linbuf_idx = ((dev->linbuf_idx + 1) & 1);
@@ -450,7 +448,7 @@ void lvgl_lcd_hal_init()
 
     /*screen initialize*/
     tft->invertDisplay(true);
-    tft->setRotation(0);
+    tft->setRotation(2);        // rotation needed if camera is on the back of the device
     tft->fillScreen(COLOR_BLACK);
 
     lv_disp_drv_t disp_drv;         /*Descriptor of a display driver*/

esp32/examples/ttgo_demo/main/main.cpp

@@ -41,17 +41,20 @@ void demo_task(void *arg) {
     disp_infos();
 
     while(true) {
+        auto start = esp_timer_get_time();
 
         camera_fb_t *fb = esp_camera_fb_get();
 
         if (!fb) {
             ESP_LOGE(TAG, "Camera capture failed");
         } else {
-            TFT_jpg_image(CENTER, 0, 0, -1, NULL, fb->buf, fb->len);
+            TFT_jpg_image(CENTER, CENTER, 0, -1, NULL, fb->buf, fb->len);
             esp_camera_fb_return(fb);
             fb = NULL;
         }
 
+        ESP_LOGI(TAG, "time taken: %lld ms", (esp_timer_get_time() - start) / 1000);
+
 #if 0   // TODO: next step..
         Mat inputImage(fb->height, fb->width, CV_8UC2, fb->buf);      // rgb565 is 2 channels of 8-bit unsigned
         Mat outputImage;
@@ -103,6 +106,8 @@ void app_main()
     /* Display memory infos */
     disp_infos();
 
+    ESP_LOGI(TAG, "Display width = %d, height = %d", tft->width(), tft->height());
+
     /* Start the tasks */
     xTaskCreatePinnedToCore(demo_task, "demo", 1024 * 9, nullptr, 24, nullptr, 0);
 }