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05.Serial Parse Data

Serial Parse Data

Serial Parse DataDevice connectionHardware connectionSoftware connectionSerial port parsing dataControl principleControl pinData format (communication protocol)Code analysisExperimental results

Parse data in a specified data format through the serial port.


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The format of the serial port parsed data refers to the communication protocol of the WiFi camera module. The serial port control tutorial below also refers to the communication protocol of the WiFi camera module!

Do not install the WiFi camera module here, otherwise it will occupy the serial port and cause abnormal information.

Device connection

Hardware connection

Use Type-B data cable to connect Arduino Uno and computer.

Software connection

Open the "Arduino IDE" software and select the model and serial port number corresponding to the development board.

Serial port parsing data

Control principle

Receive data through the serial port and determine whether the data is in the specified format, parse and store the specified data.

Control pin

Use the serial port on the Arduino IDE to send and parse data.

Serial port	Arduino Uno
RX	0
TX	1

Data format (communication protocol)

We only parse data in two data formats.

Data format	Description	Example
$	Data header
#	Data tail
Data,Data,Data	Data type 1	Data represents only numbers: 1,0,0,0
Alphabet+Data	Data type 2	Alphabet+Data represents a letter plus the following three digits: A100

Example:

Data format 1: $1,0,0,0#, $1,2,0,0#, $1,2,0,1#

Data format 2: $A100#, $A090#, $B120#

Note:

Data format 1 is mainly used to control the car status, RGB, and buzzer in the later stage
Data format 2 is mainly used to control the servo angle in the later stage

Data needs to be sent strictly in the above format.

Code analysis

Here is only a brief introduction to the code content. For detailed code, please refer to the corresponding code file, which is provided in the download area!

Define data such as arrays, flag bits, etc


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// 定义数据，如数组，标志位等 Define data such as arrays, flag bits, etc
#define BUFFER_SIZE 20
volatile uint8_t Rx_Index = 0;
volatile uint8_t Data_Flag = 0;
char* Data_Array[BUFFER_SIZE];
char Data_Servo[BUFFER_SIZE];

int DataArraySize = 0;

Receive data

Note: Receive data between $ and #


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/**
 * @brief 接收指定格式的数据 Receives data in the specified format
 * @param 无 None
 * @retval 接收指定数据 Received specified data
 */
char* recData() {
  static char Data_Buffer[BUFFER_SIZE];
  static char Rx_Buffer[BUFFER_SIZE];

  if (Serial.available() > 0) {
    char SerialData = Serial.read();
    if (SerialData == '$') {
      memset(Rx_Buffer, 0, sizeof(Rx_Buffer));
      memset(Data_Buffer, 0, sizeof(Data_Buffer));
      Data_Flag = 1;
      Rx_Index = 0;
 KEY Control Buzzer
Parse Data Control Motor