Connection MCF51EM256 to PC

polofermin — Sun, 04 Oct 2009 04:24:21 GMT

Hello everyone.

I want communicate MCF51EM256 device with the PC through the RS-232 serial port. I'm programming in C, but I do not know how to implement the communication program. Thank you very much everyone, hope your help

Yours sincerely

Fermin!

Re: Connection MCF51EM256 to PC

polofermin — Sun, 04 Oct 2009 22:05:42 GMT

I must use UART-SPI of MCF51EM256?

I hope your replies,

thanks

Best Regards

Re: Connection MCF51EM256 to PC

polofermin — Mon, 05 Oct 2009 16:41:20 GMT

Hello this is my SPI code:

spi.h:

// --------------------------------------------------------------------------------------
/////////////////////////////////////////////////////////////////////////////////////////

void SPI_Init(void);
void SPI_SetSCK(unsigned long int BusClock_freq, unsigned long int SCLK_freq);
void SPI_PutChar1(unsigned char chr);
void SPI_PutBuffer1(unsigned int dim, unsigned char *chr);
void SPI_GetChar1(unsigned char *chr);
void SPI_GetBuffer1(unsigned int dim, unsigned char *chr);

spi.c:

#include "derivative.h"

//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
/////////#define SPI2S_SPTEF_MASK 0b00100000 // bit5 SPTEF definidas en MCF51EM256
/////////#define SPI2S_SPRF_MASK 0b10000000 // bit7 SPRF

/////////////////////////////////////////////////////////////////////////////////////////
// SPI_Init
// --------------------------------------------------------------------------------------
// /////////////////////////////////////////////////////////////////////////////////////////
void SPI_Init(void)
{
    unsigned char status;

    status = SPI2S;
    status = SPI2D;

    SPI2C1 = 0x00; //.
    SPI2C2 = 0x00;

    // SPIE=1; SPE=1; SPTIE=1; MSTR=1; CPOL=1; CPHA=0; SSOE=1; LSBFE=0
   SPI2C1 = 0xFA;

   // SPMIE=0; SPIMODE=1; bit5=0; MODFEN=1; BIDIROE=0; bit2=0; SPISWAI=1; SPC0=0
   SPI2C2 = 0x52;

   //
   SPI2S = 0x00; // SPRF; SPMF; SPTEF; MODF; 0; 0; 0; 0
   status = SPI2D;

}

/////////////////////////////////////////////////////////////////////////////////////////
// SPI_SetSCK
// --------------------------------------------------------------------------------------
//
/////////////////////////////////////////////////////////////////////////////////////////
void SPI_SetSCK(unsigned long int BusClock_freq, unsigned long int SCLK_freq)
{
unsigned long int BRdiv;

// bit7=0; SPPR2=0; SPPR1=0; SPPR0=1; SPR3=0; SPR2=0; SPR1=0; SPR0=1
// Prescale divisor=2; Rate divisor=4.
SPI2BR=0x11;

BRdiv = BusClock_freq / SCLK_freq;

}

/////////////////////////////////////////////////////////////////////////////////////////
// SPI_PutChar
// --------------------------------------------------------------------------------------
//
/////////////////////////////////////////////////////////////////////////////////////////
void SPI_PutChar1(unsigned char chr)
{
unsigned char data;

// while (!(SPI2S & SPI2S_SPTEF_MASK))
;

// SPI2D = chr;

while (!(SPI2S & SPI2S_SPRF_MASK))
;

//
data = SPI2D;

}

/////////////////////////////////////////////////////////////////////////////////////////
// SPI_PutBuffer
// --------------------------------------------------------------------------------------
//
/////////////////////////////////////////////////////////////////////////////////////////
void SPI_PutBuffer1(unsigned int dim, unsigned char *chr)
{
unsigned int i;

for (i = 0; i<dim; i++)
{
SPI_PutChar(*chr++);
}

}

/////////////////////////////////////////////////////////////////////////////////////////
// SPI_GetChar
// --------------------------------------------------------------------------------------
// /////////////////////////////////////////////////////////////////////////////////////////
void SPI_GetChar1(unsigned char *chr)
{

while(!(SPI2S & SPI2S_SPTEF_MASK))
  ;

while(!(SPI2S & SPI2S_SPRF_MASK))
  ;
*chr = SPI2D; //
}

/////////////////////////////////////////////////////////////////////////////////////////
// SPI_GetBuffer
// --------------------------------------------------------------------------------------
//
/////////////////////////////////////////////////////////////////////////////////////////
void SPI_GetBuffer1(unsigned int dim,unsigned char *chr)
{
unsigned int i;

for (i = 0; i<dim; i++)
SPI_GetChar(chr++);
}

With this code I want to communicate MCF51EM256 and ADE7753 device, but I don´t know how implement the interface in RS-232 between MCF51EM256 and PC.

I wait your reply, thanks so much.

Yours sincerely.

Fermin.

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