【FireBeetle 2 ESP32-S3开发板体验】004：拍照，显示，存储

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上一帖介绍增加屏幕和SD卡组件，并通过Arduino编写基础程序模块，为后面实验做准备。这一贴介绍在前面工作基础上，使用摄像头拍照，将图像缩小显示在屏幕上，将原图保存在SD卡上。

我预期的最终作品是一个鱼缸监视器，其中一个重要功能就是定时拍照鱼缸的图片并存储，本次实验实现这个功能。在上一贴中，已经实现图片缩小和显示，这次要实现拍照，存储，并和上一次的程序整合到一起。

最开始设计的基本流程是：a、设置摄像头参数；b、从摄像头获得图片数据；c、打开SD目录；d、建立图片文件；e、写入文件并关闭文件；f、读取文件；g、用《TJpg_Decoder》库缩小后显示到屏幕上；h、显示图片名称。

其中实现a-e拍照并存储的代码如下。

图1、拍照并存储图片

其中，使用EEPROM的目的是实现图片名称的连续存储，即使掉电也能接续上之前的名称序号继续存储，而不会导致名称重置覆盖掉之前的图片。

在调试过程中，我发现《TJpg_Decoder》库是支持从数组直接进行显示的，这样就不用频繁操作SD卡了，我又把流程进行了更改如下。

a、设置摄像头参数；b、从摄像头获得图片数据；c、用《TJpg_Decoder》库缩小后显示到屏幕上；d、显示图片名称；e、打开SD目录；f、建立图片文件；g、写入文件并关闭文件。

如此更改后，减少了一步读卡过程，提高了效率，减少SD卡寿命磨损。代码如下。

图2、

我设置了连续存储十张照片，并通过串口输出照片的相关信息，可以实时看到程序运行状态。串口输出效果如下。

图3、串口输出

存完的照片，在SD卡上的结果如下图所示。

图4、存到卡上的照片

整体代码如下。

#include "esp_camera.h"
#include
#include "DFRobot_AXP313A.h"
#include "Arduino.h"
#include "FS.h"
#include
#include "SD.h"
#include "SPI.h"
// Include the jpeg decoder library
#include
#include // Hardware-specific library
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
// This next function will be called during decoding of the jpeg file to
// render each block to the TFT. If you use a different TFT library
// you will need to adapt this function to suit.
bool tft_output(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t *bitmap) {
// Stop further decoding as image is running off bottom of screen
if (y >= tft.height()) return 0;
// This function will clip the image block rendering automatically at the TFT boundaries
tft.pushImage(x, y, w, h, bitmap);
// This might work instead if you adapt the sketch to use the Adafruit_GFX library
// tft.drawRGBBitmap(x, y, bitmap, w, h);
// Return 1 to decode next block
return 1;
}
#define EEPROM_SIZE 1
int pictureNumber = 0;
unsigned long times = 0;
unsigned long timess = 0;
DFRobot_AXP313A axp;
#define FORWARD 1
#define BACKWARD -1
#define PWDN_GPIO_NUM -1
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 45
#define SIOD_GPIO_NUM 1
#define SIOC_GPIO_NUM 2
#define Y9_GPIO_NUM 48
#define Y8_GPIO_NUM 46
#define Y7_GPIO_NUM 8
#define Y6_GPIO_NUM 7
#define Y5_GPIO_NUM 4
#define Y4_GPIO_NUM 41
#define Y3_GPIO_NUM 40
#define Y2_GPIO_NUM 39
#define VSYNC_GPIO_NUM 6
#define HREF_GPIO_NUM 42
#define PCLK_GPIO_NUM 5
void setupCamera() {
while (axp.begin() != 0) {
Serial.println("init error");
delay(1000);
}
axp.enableCameraPower(axp.eOV2640);
camera_config_t config;
config.ledc_channel = LEDC_CHANNEL_0;
config.ledc_timer = LEDC_TIMER_0;
config.pin_d0 = Y2_GPIO_NUM;
config.pin_d1 = Y3_GPIO_NUM;
config.pin_d2 = Y4_GPIO_NUM;
config.pin_d3 = Y5_GPIO_NUM;
config.pin_d4 = Y6_GPIO_NUM;
config.pin_d5 = Y7_GPIO_NUM;
config.pin_d6 = Y8_GPIO_NUM;
config.pin_d7 = Y9_GPIO_NUM;
config.pin_xclk = XCLK_GPIO_NUM;
config.pin_pclk = PCLK_GPIO_NUM;
config.pin_vsync = VSYNC_GPIO_NUM;
config.pin_href = HREF_GPIO_NUM;
config.pin_sscb_sda = SIOD_GPIO_NUM;
config.pin_sscb_scl = SIOC_GPIO_NUM;
config.pin_pwdn = PWDN_GPIO_NUM;
config.pin_reset = RESET_GPIO_NUM;
config.xclk_freq_hz = 20000000;
config.frame_size = FRAMESIZE_UXGA; //FRAMESIZE_HVGA; //
config.pixel_format = PIXFORMAT_JPEG;
config.grab_mode = CAMERA_GRAB_WHEN_EMPTY;
config.fb_location = CAMERA_FB_IN_PSRAM;
config.jpeg_quality = 12;
config.fb_count = 1;
if (config.pixel_format == PIXFORMAT_JPEG) {
if (psramFound()) {
config.jpeg_quality = 10;
config.fb_count = 1;
config.grab_mode = CAMERA_GRAB_LATEST;
} else {
config.frame_size = FRAMESIZE_SVGA;
config.fb_location = CAMERA_FB_IN_DRAM;
}
} else {
config.frame_size = FRAMESIZE_240X240;
#if CONFIG_IDF_TARGET_ESP32S3
config.fb_count = 2;
#endif
}
esp_err_t err = esp_camera_init(&config);
if (err != ESP_OK) {
Serial.printf("Camera init failed with error 0x%x", err);
return;
}
if (psramFound()) {
heap_caps_malloc_extmem_enable(20000);
Serial.printf("PSRAM initialized. malloc to take memory from psram above this size");
}
}
void SDinitialization() {
if (!SD.begin(GDI_SDCS)) {
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD.cardType();
if (cardType == CARD_NONE) {
Serial.println("No SD card attached");
return;
}
Serial.print("SD Card Type: ");
if (cardType == CARD_MMC) {
Serial.println("MMC");
} else if (cardType == CARD_SD) {
Serial.println("SDSC");
} else if (cardType == CARD_SDHC) {
Serial.println("SDHC");
} else {
Serial.println("UNKNOWN");
}
uint64_t cardSize = SD.cardSize() / (1024 * 1024);
Serial.printf("SD Card Size: %lluMB\n", cardSize);
}
void tft_init(void) {
// Initialise the TFT
tft.begin();
tft.setTextColor(0xFFFF, 0x0000);
tft.fillScreen(TFT_BLACK);
tft.setSwapBytes(true); // We need to swap the colour bytes (endianess)
tft.setRotation(1); // portrait
// The jpeg image can be scaled by a factor of 1, 2, 4, or 8
// TJpgDec.setJpgScale(1);//for 480*320
TJpgDec.setJpgScale(4); //for 1600*1200
// The decoder must be given the exact name of the rendering function above
TJpgDec.setCallback(tft_output);
}
void setup(void) {
Serial.begin(115200);
// Set all chip selects high to avoid bus contention during initialisation of each peripheral
pinMode(GDI_CS, OUTPUT);
pinMode(GDI_TCS, OUTPUT);
pinMode(GDI_SDCS, OUTPUT);
digitalWrite(GDI_TCS, HIGH); // Touch controller chip select (if used)
digitalWrite(GDI_CS, HIGH); // TFT screen chip select
digitalWrite(GDI_SDCS, HIGH); // SD card chips select, must use GPIO 5 (ESP32 SS)
setupCamera();
SDinitialization();
tft_init();
EEPROM.begin(EEPROM_SIZE);
EEPROM.write(0, pictureNumber);
EEPROM.commit();
}
void Imagestorage() {
camera_fb_t *fb = NULL;
fb = esp_camera_fb_get();
if (!fb) {
Serial.println("Camera capture failed");
return;
}
EEPROM.begin(EEPROM_SIZE);
pictureNumber = EEPROM.read(0) + 1;
String path = "/picture" + String(pictureNumber) + ".jpg";
//////////////////////////////////////////////////////////////////////////////////////////////////////////
tft.fillScreen(TFT_RED);
// Time recorded for test purposes
uint32_t t = millis();
// Get the width and height in pixels of the jpeg if you wish
uint16_t w = 0, h = 0;
TJpgDec.getJpgSize(&w, &h, fb->buf, fb->len);
Serial.print("Width = ");
Serial.print(w);
Serial.print(", height = ");
Serial.println(h);
// Draw the image, top left at 0,0
TJpgDec.drawJpg(0, 0, fb->buf, fb->len);
// How much time did rendering take (ESP8266 80MHz 262ms, 160MHz 149ms, ESP32 SPI 111ms, 8bit parallel 90ms
t = millis() - t;
Serial.print(t);
Serial.println(" ms");
tft.drawString(path.c_str() + 1, 0, 290, 4);
//////////////////////////////////////////////////////////////////////////////////////////////////////////
fs::FS &fs = SD;
Serial.printf("Picture file name: %s\n", path.c_str());
File file = fs.open(path.c_str(), FILE_WRITE);
if (!file) {
Serial.println("Failed to open file in writing mode");
} else {
file.write(fb->buf, fb->len);
Serial.printf("Saved file to path: %s\n", path.c_str());
EEPROM.write(0, pictureNumber);
EEPROM.commit();
}
file.close();
esp_camera_fb_return(fb);
}
void loop() {
delay(2000);
Imagestorage();
times++;
if (times > 9) {
Serial.println("finished!");
while (1)
;
}
}

复制代码

整个过程视频如下。

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【FireBeetle 2 ESP32-S3开发板体验】004：拍照，显示，存储

拍照存卡

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