Simulink and Arduino serial port communication

The purpose of this article is ：Simulink And Arduino Serial port communication , And then get and Arduino Connected pressure sensor FSR402 The data of .

Simulink And Arduino There are two ways to interact （http://www.51hei.com/arduino/3989.html）：
(1)Simulink Arduino Support package
(2)Simulink Serial port communication

As has been given Arduino It's programmed and read FSR402 Procedure for pressure values （ link ：https://pan.baidu.com/s/1yadaWsIm-4wXirOJWflCLA
Extraction code ：llhh）, Hope again in Simulink Call serial port in , Reading data . here Simulink Arduino Support package Obviously not . Here we need to use Simulink Serial port module in Serial Receive, From the Serial Receive It can be seen from the module that what it receives is binary data .

Before implementation , The way of serial communication needs to be explained . There are generally two ways of serial communication ： 1、 character （ Corresponding text mode ） 2、 byte （ Corresponding to binary mode ）

character	byte
fscanf fprint (Matlab)	fread fwrite (Matlab)
Serial. print (Arduino)	Serial.write (Arduino)

Popular speaking , Character mode is for PC End display , Byte mode is more used to communicate with serial port devices .

So in Arduino In the program, we can find , It's using print Function to output data , Then you can check the output on the serial port monitor . however Serial Receive Received binary data , So you need to use write Function performs byte by byte output , Then write the pressure value to Arduino Corresponding serial port , thus Simulink Read through the serial port receiving module .

Arduino send out
Arduino In the use of union To send the float Type data . The code snippet is as follows

Definition union SeFrame

union SeFrame
{
    
  long Long;
  byte Byte[4];
};
SeFrame Sefram; 

Send data code snippet ：

void Send_long(long LONG)
{
    
    Sefram.Long= LONG;
    Serial.write(Sefram.Byte[0]);
    Serial.write(Sefram.Byte[1]);
    Serial.write(Sefram.Byte[2]);
    Serial.write(Sefram.Byte[3]);
}

simulink Receive settings

Serial Receive Module ：

data type Set to int32, Every data use 4 Bytes

data size Set to 1, Because there is only one data we want to send .

The end result is as follows ：