segue codigo ,conforme combinado
/*---------------------------------------------------
TESTE SPI.C
---------------------------------------------------*/
#include <at89c51xd2.h>
#define CURSOR_FINO 0x0E // Faz o cursor sublinhado.
#define CURSOR_CHEIO 0x0D // Faz o cursor completo.
#define CURSOR_APAGA 0x0C // Apaga o cursor.
char serial_data;
char data_example=0x21;
bit transmit_completed=0;
xdata unsigned char COMANDOLCD _at_ 0xFFF0; // cpu teste
xdata unsigned char DADOLCD _at_ 0xFFF1; // cpu teste
void cmlcd (unsigned char);
void setcursor (unsigned char);
void wrlcd (unsigned char);
void gotoxy (unsigned char, unsigned char);
void write (unsigned char *);
void initlcd (void);
void atualiza (void);
void INICIALIZA (void);
void TELA (void);
/*-----------------------------------------
---- Envia um comando para o display. ----
-----------------------------------------*/
void cmlcd(unsigned char c)
{
unsigned int delay;
COMANDOLCD=c;
for (delay = 0; delay < 20; delay++);
}
/*------------------------------------------
---- Envia um caractere para o display. ----
------------------------------------------*/
void wrlcd(unsigned char c)
{
unsigned int delay;
DADOLCD=c;
for (delay = 0; delay < 10; delay++);
}
/*-------------------------------------
---- Posiciona o cursor no display ----
-------------------------------------*/
void gotoxy(unsigned char x, unsigned char y)
{
cmlcd((128 | (((--y & 1)^1)<< 6))+((--x & 127) | ((--y & 2) << 3)));
}
/*-----------------------------------------------------
---- Envia para o display uma cadeia de caracteres ----
-----------------------------------------------------*/
void write(unsigned char *c)
{
for(;*c!=0;c++) wrlcd(*c);
}
/*----------------------------------
---- Define o formato do cursor ----
----------------------------------*/
void setcursor(unsigned char tipo)
{
cmlcd(tipo);
}
/*-----------------------------------------
---- initlcd ----
-----------------------------------------*/
void initlcd(void)
{
unsigned int t;
for (t = 0; t < 500; t++);
cmlcd(0x38);
for (t = 0; t < 500; t++);
cmlcd(0x38);
for (t = 0; t < 500; t++);
cmlcd(0x0C);
for (t = 0; t < 500; t++);
cmlcd(0x01);
for (t = 0; t < 500; t++);
}
/*-----------------------------------------
---- Inicializa o Display ----
-----------------------------------------*/
void INICIALIZA (void)
{
unsigned int count;
initlcd ();
setcursor (CURSOR_APAGA);
gotoxy (9,1);
write (" ");
gotoxy (1,2);
write ("** **");
for (count=0 ; count<65500 ; count++);
}
/*-----------------------------------------
---- Mostra Mensagem do Projeto ----
-----------------------------------------*/
void TELA (void)
{
gotoxy (1,1);
write (" PROJETO SPI ");
gotoxy (1,2);
write (" 89c51ed2 Master ");
gotoxy (5,3);
write (" ");
gotoxy (5,4);
write (" ");
}
/*------------------------------------------------
The main C function. Program execution starts
here after stack initialization.
------------------------------------------------*/
void main (void)
{
unsigned int t;
P0=0xFF;
P1=0xFF;
P2=0xFF;
P3=0xFF;
INICIALIZA ();
TELA ();
SPCON |= 0x10;
P1_1=1;
SPCON |= 0x01; // f/4
SPCON &= ~0x08;
SPCON |= 0x04;
IEN1 |= 0x04;
SPCON |= 0x40;
EA=1;
serial_data=0;
while (1)
{
gotoxy (5,3);
write (" Enviou: ");
wrlcd (data_example);
SPDAT=data_example;
data_example++;
if (data_example == 121) data_example=0x21;
while (!transmit_completed);
transmit_completed=0;
SPDAT=0x00;
while (!transmit_completed);
transmit_completed=0;
gotoxy (5,4);
write (" Recebeu: ");
wrlcd (serial_data);
for (t=0;t<40000;t++);
}
}
void it_SPI (void) interrupt 9
{
switch (SPSTA)
{
case 0x80:
serial_data=SPDAT;
transmit_completed=1;
break;
case 0x10:
break;
case 0x40:
break;
}
}
Enviado: 22 Jan 2007 17:56
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