ESP32Cam自带了一个SD卡模块
但是在这里SD卡的连线并没有体现出SPI协议。
一张Micro SD卡引脚图如下:
一张micro SD卡有8个引脚。下表描述了每个引脚的功能。
引脚序号 | 名称 | 功能说明 | ESP32cam原理图 |
---|---|---|---|
1 | NC | 未连接 | HS2_DATA2(GPIO12) |
2 | CS | 片选/从选择(SS) | HS2_DATA3(GPI13) |
3 | DI | 主输出/从输入(MOSI) | HS2_CMD(GPIO15) |
4 | VDD | 电源电压 | VDD |
5 | CLK | 时钟(SCK) | HS2_CLK(GPIO14) |
6 | VSS | 电源电压地 | VSS |
7 | DO | 主输入/从输出(MISO) | HS2_DATA0(GPIO2) |
8 | RSV | 保留 | HS2_DATA1 (GPIO4) |
由原理图是已经可以知道各个引脚的连接,但是,基于Arduino的尿性,我还是不知道该怎么配置。
然后我就一直在纠结怎么在SPI初始化的时候自定义引脚就像这样:
SPI.begin(14,2,15,13);//SCK,MISO,MOSI,ss
delay(10);
if (!SD.begin(13, SPI, 40000000, "/sd")) {
Serial.println("Card Mount Failed");
}
然后全部失败!
可笑的是,在亚马逊卖ESP32cam模块的界面找到了,它的使用源码并且找到了一个人写的:https://github.com/v12345vtm/CameraWebserver2SD/blob/master/CameraWebserver2SD/CameraWebserver2SD.ino
这哥们用的是SD_MMC模块来写入SD卡的,最后终于搞定!
核心代码:
//acquire a frame
camera_fb_t * fb = esp_camera_fb_get();
if (!fb)
{
Serial.print( "Camera capture failed");
}
else
{
if(fb->format != PIXFORMAT_JPEG)
{
Serial.print("jpeg error");
esp_camera_fb_return(fb);
}
else
{
const char * path = "/capture.jpg";
fs::FS &fs = SD_MMC;
Serial.printf("Writing file: %s\n", path);
File file = fs.open(path, FILE_WRITE);
if(!file)
{
Serial.println("Failed to open file for SDwriting547");
}
else
{
file.write(fb->buf , fb->len); //payload , lengte vd payload
Serial.println("succes to open file for SDwriting552");
}
esp_camera_fb_return(fb);
}
}
按键设置为:GPIO16
#include "esp_camera.h"
#include "FS.h"
#include
#include
#include "SD_MMC.h"
int buttonState = 0;
int btnHold = 0;
#define KEY_PIN 16
#define PWDN_GPIO_NUM 32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 0
#define SIOD_GPIO_NUM 26
#define SIOC_GPIO_NUM 27
#define Y9_GPIO_NUM 35
#define Y8_GPIO_NUM 34
#define Y7_GPIO_NUM 39
#define Y6_GPIO_NUM 36
#define Y5_GPIO_NUM 21
#define Y4_GPIO_NUM 19
#define Y3_GPIO_NUM 18
#define Y2_GPIO_NUM 5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM 23
#define PCLK_GPIO_NUM 22
static camera_config_t camera_config = {
.pin_pwdn = PWDN_GPIO_NUM,
.pin_reset = RESET_GPIO_NUM,
.pin_xclk = XCLK_GPIO_NUM,
.pin_sscb_sda = SIOD_GPIO_NUM,
.pin_sscb_scl = SIOC_GPIO_NUM,
.pin_d7 = Y9_GPIO_NUM,
.pin_d6 = Y8_GPIO_NUM,
.pin_d5 = Y7_GPIO_NUM,
.pin_d4 = Y6_GPIO_NUM,
.pin_d3 = Y5_GPIO_NUM,
.pin_d2 = Y4_GPIO_NUM,
.pin_d1 = Y3_GPIO_NUM,
.pin_d0 = Y2_GPIO_NUM,
.pin_vsync = VSYNC_GPIO_NUM,
.pin_href = HREF_GPIO_NUM,
.pin_pclk = PCLK_GPIO_NUM,
.xclk_freq_hz = 20000000,
.ledc_timer = LEDC_TIMER_0,
.ledc_channel = LEDC_CHANNEL_0,
.pixel_format = PIXFORMAT_JPEG,
.frame_size = FRAMESIZE_XGA,
.jpeg_quality = 12,
.fb_count = 1,
};
esp_err_t camera_init() {
//initialize the camera
esp_err_t err = esp_camera_init(&camera_config);
if (err != ESP_OK) {
Serial.print("Camera Init Failed");
return err;
}
sensor_t * s = esp_camera_sensor_get();
//initial sensors are flipped vertically and colors are a bit saturated
if (s->id.PID == OV2640_PID) {
// s->set_vflip(s, 1);//flip it back
// s->set_brightness(s, 1);//up the blightness just a bit
// s->set_contrast(s, 1);
}
Serial.print("Camera Init OK");
return ESP_OK;
}
void sd_init(void)
{
Serial.print("Initializing SD card...");
//SD card init
if (!SD_MMC.begin()) {
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD_MMC.cardType();
if (cardType == CARD_NONE) {
Serial.println("No SD_MMC card attached");
return;
}
Serial.print("SD_MMC 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");
}
if (SD_MMC.exists("test.txt")) {
Serial.println("exist");
}
else
{
Serial.println("doesn't exist");
}
}
void setup() {
Serial.begin(115200);
camera_init();
sd_init();
pinMode(KEY_PIN, INPUT_PULLUP); //设置按键管脚输入上拉模式
Serial.println("sys is running!");
}
void loop()
{
buttonState = digitalRead(KEY_PIN); //读取按键返回状态值
if (buttonState == LOW && btnHold == 0)
{ // 若按键被按下
delay(100); //等待跳过按键抖动的不稳定过程
if (buttonState == LOW) // 若按键被按下
{
Serial.print("click\r\n");
btnHold = 1;
//acquire a frame
camera_fb_t * fb = esp_camera_fb_get();
if (!fb)
{
Serial.print( "Camera capture failed");
}
else
{
const char * path = "/capture.jpg";
fs::FS &fs = SD_MMC;
Serial.printf("Writing file: %s\n", path);
File file = fs.open(path, FILE_WRITE);
if (!file)
{
Serial.println("Failed to open file for SDwriting547");
}
else
{
file.write(fb->buf , fb->len); //payload , lengte vd payload
Serial.println("succes to open file for SDwriting552");
}
//return the frame buffer back to the driver for reuse
esp_camera_fb_return(fb);
}
}
}
if (buttonState == HIGH)
{
btnHold = 0;
}
}