AT89S8252 SPI interrupt based transmission

[NOORPURI]

I am trying SPI and UART transmission using combined interrupt . In simulation it seems 100 # right but in real it does not work.





/***********************************************/
#include <AT898252.H>

unsigned char UART_RX=0;
unsigned char SPI_RX =0;
unsigned char SPI_RX_FLUSH=0;
bit UART_TRANSMIT=0;
bit SPI_TRANSMIT= 0;
bit SPI_RECV= 0;


void UART_SPI_ISR(void) interrupt 4
{
if(RI)
{UART_RX=SBUF; RI=0; }

if(TI) {TI=0; UART_TRANSMIT=0;}
/*-------------SPI ISR PART---------------*/
if (SPSR==0x80) /* read and clear spi status register */
{
if(SPI_RECV==1)
{
SPI_RX=SPDR;
SPI_RECV=0; }

if(SPI_TRANSMIT==1)
{
SPI_TRANSMIT=0;
SPI_RX_FLUSH=SPDR;
SS=1;}/* set software flag */
}

}

void UART_SPI_INIT()
{
/*--- Initialize the serial port.----------*/

TMOD = 0x20;
PCON=PCON|0x80;
TH1=0xFF; // BAUD RATE 57600
TR1 = 1;
SCON = 0x50;
/*--------- Initialize the SPI port------*/

SPCR = 0xD0 /* 11010000*/

ES=1;
EA=1;
}

/*----------------------------------------------*/
//--------------------------------------------
//UART SEND CHAR FUNCTION
//--------------------------------------------
void SEND_CHAR_UART(unsigned char SND)
{

while((SPI_TRANSMIT)||(SPI_RECV)||(UART_TRANSMIT));
if(UART_TRANSMIT==0)
{
UART_TRANSMIT=1;
SBUF=SND;
}

}
/*-------------------------------------------*/
//--------------------------------------------
void SEND_CHAR_SPI(unsigned char SND)
{

while((SPI_TRANSMIT)||(SPI_RECV)||(UART_TRANSMIT));
if(SPI_TRANSMIT==0)
{
SPI_TRANSMIT=1;
SPDR=SND;
}

}

//--------------------------------------------
//SPI RECV CHAR FUNCTION
//--------------------------------------------
unsigned char RECV_CHAR_SPI()
{
unsigned char RECVD=0;

while((SPI_TRANSMIT)||(SPI_RECV)||(UART_TRANSMIT));

SPDR=0xFF;
SPI_RECV=1;

while((SPI_TRANSMIT)||(SPI_RECV)||(UART_TRANSMIT));
if(SPI_RECV==0)
{
RECVD=SPI_RX;
return RECVD;
}
}



/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void main (void)
{

UART_SPI_INIT();

while (1)
{
SEND_CHAR_UART(0x55); // SEND 'U' by UART
SEND_CHAR_SPI(0x55); // SEND 'U' by SPI P1_0=~P1_0;

}

}

 

[n_jinjakam]

Yes, I have try a lot on uart with C in Keil but it never works!!!!

 

[wek]

What exactly "does not work" means?