Problem Facing during Link Data From Matlab To DSPIC 30f4011

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QY Goh 2012-5-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/39285-problem-facing-during-link-data-from-matlab-to-dspic-30f4011

Hello guys, I currently doing some communication between MATLAB and dspic 30f4011, And i dun know how to set up the MATLAB (mfiles R2008 Version) and dspic30f40111 for it to start the UART connection. Here is the some coding i try on it but i still unable to execute. Din't u has any idea about it?

MATLAB Code

==================================================================

function comparison ()
global x1 y1 
global turn
turn=0;
s=serial('COM3');
set(s,'BaudRate',4800);
fopen(s);
fprintf(s,'2');
out=fscanf(s);
fclose(s);

========================================================================

DSPIC coding

#include <p30f4011.h>
_FOSC(CSW_FSCM_OFF & XT_PLL8);   // 15MHz Crystal with PLLx8 = 30 MIP 
_FWDT(WDT_OFF);                   // Disable Watch-Dog Timer.
_FBORPOR(PBOR_OFF & MCLR_EN); 
_FGS(CODE_PROT_OFF); 
#define switch2 PORTBbits.RB0            
unsigned char data=0;
void Init_PWM(void);
void init_io (void);
void delay(unsigned long data);
void init_uart (void);
unsigned char uart_rec(void);
void uart_send(unsigned char data);  
int main()
{  
  init_io();
  Init_PWM();   // Initialize PWM module
  init_uart();
  uart_send(1);
  data=uart_rec();
  
  while(1)     // Infinite forever
  {
    if(data==1||switch2==0)
    {
      PDC1 =600;
      PDC2 =600;
      PDC3 =600;
      delay(2000000);
      PDC1 =1500;
      PDC2 =1500;
      PDC3 =1500;
      delay(2000000);
    }
  }
}
void init_uart (void)
{
  U1BRG = 103;      //initialise UART1  8 /16/25/51/ 103
   U1MODE = 0x8800;
  U1STAbits.UTXEN = 1;
}
unsigned char uart_rec(void)      //receive uart value
{
  unsigned int rec_data;
  while(U1STAbits.URXDA==0);    //wait for data
  rec_data = U1RXREG;
  return rec_data;          //return the data received
}
void uart_send(unsigned char data)
{
  while(U1STAbits.UTXBF ==1);    //only send the new data after
  U1TXREG=data;          //the previous data finish sent
}

But my circuit no able to run. Has any idea for it?or didn't i miss something?Thank you and has a nice day.

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Walter Roberson 2012-5-24

One thing I note is that your MATLAB code does not do anything with the value you read. I have known compilers that would optimize the entire reading call out if the compiler figured the call was not needed. You could _try_ doing something with "s" after you read it, such as displaying it. I don't think it will solve your problem, but it might.

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