esp 32 cam从串口获取WiFi名称和密码

本人发现很多都是WiFi名称密码写死在代码里的，那么esp 32可不可以从串口读取wifi名称和密码呢，尝试了一下还真可以，代码如下已附上，wifi名称和密码都是正确的，但是连WiFi还是一直连不上，不确定什么原因。

	//通过串口修改wifi及其密码
  int i = 0;
  Serial.print("请输入wifi名称:\n");
  i = Serial.available();
  while (i == 0) {
    i = Serial.available();
  }
  cmd = Serial.readString();
  const char* ssid = cmd.c_str();

  clear_buffer();
  Serial.print("请输入wifi密码:\n");
  i = Serial.available();//查看串口缓存bufer
  while (i == 0) {
    i = Serial.available();
  }

  clear_buffer();//清空缓存

  Serial.print("wifi名称:");
  Serial.print(ssid);
  Serial.print("\n");
  Serial.print("wifi密码:");
  Serial.print(password);
  Serial.print("\n");

void clear_buffer()
{
  while(Serial.read() > 0) {
    Serial.println("clsar buff");
  }
}

经过一系列排查，终于找到问题出在哪了

  cmd = Serial.readString();
  const char* ssid = cmd.c_str();

原来是这里从串口读出的String类型数据后面是多了一个‘\n’，所以读出的String类型需要截取一下才可以。

  Serial_cmd0 = Serial.readString();//读出串口数据，注意：这里读出的数据是Sring类型
  Serial_cmd0 = Serial_cmd0.substring(0, (Serial_cmd0.length() - 1));//重点：这里需要截取数据，截取0到读出数据减1。

  const char* ssid = Serial_cmd0.c_str();//将String数据类型转换成const char*型

重新优化了代码，通过串口读取WiFi名称密码没问题了，废话不多说，完整代码如下：

#include "esp_camera.h"
#include <WiFi.h>

//
// WARNING!!! Make sure that you have either selected ESP32 Wrover Module,
//            or another board which has PSRAM enabled
//

// 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

#include "camera_pins.h"

String Serial_cmd0 = "";
String Serial_cmd1 = "";

void startCameraServer();
void clear_buffer();

void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  Serial.println();
  //以下是通过串口读入wifi及其密码
  int i = 0;
  Serial.print("请输入wifi名称:\n");
  while (!Serial.available());//判断串口buff的缓存大小，无串口数据时等待

  Serial_cmd0 = Serial.readString();//读出串口数据，注意：这里读出的数据是Sring类型
  Serial_cmd0 = Serial_cmd0.substring(0, (Serial_cmd0.length() - 1));//重点：这里需要截取数据，截取0到读出数据减1。

  const char* ssid = Serial_cmd0.c_str();//将String数据类型转换成const char*型
  clear_buffer();//清空串口缓存数据

  Serial.print("请输入wifi密码:\n");
  while (!Serial.available());//判断串口buff的缓存大小，无串口数据时等待

  Serial_cmd1 = Serial.readString();//读出串口数据，注意：这里读出的数据是Sring类型
  Serial_cmd1 = Serial_cmd1.substring(0, (Serial_cmd1.length() - 1));//重点：这里需要截取数据，截取0到读出数据减1。

  const char* password = Serial_cmd1.c_str();//将String数据类型转换成const char*型

  clear_buffer();//清空串口缓存数据
 
  Serial.print("wifi名称:");
  Serial.print(ssid);
  Serial.print("\n");

  Serial.print("wifi密码:");
  Serial.print(password);
  Serial.print("\n");

  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.pixel_format = PIXFORMAT_JPEG;
  //init with high specs to pre-allocate larger buffers
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }

#if defined(CAMERA_MODEL_ESP_EYE)
  pinMode(13, INPUT_PULLUP);
  pinMode(14, INPUT_PULLUP);
#endif

  // camera init
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }

  sensor_t * s = esp_camera_sensor_get();
  //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
  }
  //drop down frame size for higher initial frame rate
  s->set_framesize(s, FRAMESIZE_QVGA);

#if defined(CAMERA_MODEL_M5STACK_WIDE)
  s->set_vflip(s, 1);
  s->set_hmirror(s, 1);
#endif

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("正在联网...\n");
    //WiFi.begin(ssid, password);
  }
  Serial.println("");
  Serial.println("WiFi connected");

  startCameraServer();

  Serial.print("Camera Ready! Use 'http://");
  Serial.print(WiFi.localIP());
  Serial.println("' to connect");
}

void clear_buffer()
{
  while(Serial.read() > 0) {
    Serial.println("clsar buff");
  }
}
void loop() {
  // put your main code here, to run repeatedly:
  delay(10000);
}