求51单片机模拟SPI通讯的C程序，最好带详解！谢谢

调试已经通过

///////////////////////////spi.h/////////////////////////////

#ifndef

SPI_H

#define

SPI_H

#include

<stc12le5a60s2.h>

#include

<spi.h>

//sfr

P4

=

0xe8

//STC12LE5A60S2单片机自带SPI控制器连接

//sbit

VCC1

=

P2^0//

VCC1

NO

USE

//sbit

SON

=

P1^6

//

MISO

//sbit

SIN

=

P1^5

//

MOSI

//sbit

SCKN

=

P1^7

//

SCK

sbit

CSN

=

P1^4

//

28J60

--

CS

//sbit

RSTN

=

P3^5

//RST,

no

use

//sbit

INTN

=

P3^3

//

INT,

no

use

void

init_spi(void)

void

WriteByte(u8_t

temp)

u8_t

ReadByte(void)

#endif

////////////////////////////////////////////////////////////////

///////////////////////////spi.c/////////////////////////////

#include<spi.h>

//STC12LE5A60S2单片机自带SPI控制器连接

void

init_spi(void)

{

//SSIG

=

1

//忽略SS脚

//SPEN

=

1

//允许SPI工作

//DORD

=

0

//先传高位MSB

//MSTR

=

1

//设置单片机为主机

SPCTL

=

0xD0

//SPI

Control

Register

SSIG

SPEN

DORD

MSTR

CPOL

CPHA

SPR1

SPR0

0000,0100

SPSTAT

=

0xC0

//

//IE2

|=

0x02

//允许SPI中断控制位

}

void

WriteByte(u8_t

temp)

{

SPDAT

=

temp

while(!(SPSTAT

&

0x80))

SPSTAT

=

0xC0

}

u8_t

ReadByte(void)

{

idata

u8_t

temp

//SPSTAT

=

0xC0

SPDAT

=

0x00

while(!(SPSTAT

&

0x80))

temp

=

SPDAT

SPSTAT

=

0xC0

return

temp

}

////////////////////////////////////////////////////////////////

这是 读写pcf2127a的程序。用spi接口。

cpu 是51兼容系列 cy7c68013

#define spi_read 0x20

#define spi_write 0xa0

void spi_start(void)

{ OEE|=spi_ce+spi_di+spi_clk

OEE &= ~spi_do

SYNCDELAY

IOE&=~(spi_ce|spi_clk)

SYNCDELAY

}

void spi_stop(void)

{

IOE |=spi_ce

SYNCDELAY

}

void spi_wr(unsigned char command)

{

char i

for (i=0i<8i++)

{

if((command&0x80)==0x80) {IOE |=spi_di}else {IOE &=~spi_di}

command<<=1

SYNCDELAY

IOE |=spi_clk

SYNCDELAY

IOE &=~spi_clk

SYNCDELAY

SYNCDELAY

}

}

unsigned char spi_rd(void)

{

unsigned char bret

char i

bret=0

for (i=0i<8i++)

{IOE |=spi_clk

bret<<=1

SYNCDELAY

SYNCDELAY

if((IOE&spi_do)==spi_do){ bret++}

IOE &= ~spi_clk

SYNCDELAY

SYNCDELAY

}

return bret

}

void spi_writedata(unsigned char address,unsigned char command)

{

address&=0x1f

address|=0x20

spi_start()

spi_wr(address)

SYNCDELAY

spi_wr(command)

spi_stop()

}

unsigned char spi_readdata(unsigned char address)

{unsigned char bret

address&=0x1f

address |=0xa0

spi_start()

spi_wr(address)

SYNCDELAY

bret=spi_rd()

spi_stop()

return bret

}

void read_time(unsigned char address)

{spi_start()

spi_wr(address|0xa0)

EP0BUF[8] =spi_rd()//秒

EP0BUF[9]= spi_rd()//分

EP0BUF[10]= spi_rd()//时

EP0BUF[11]= spi_rd()//日

EP0BUF[12]= spi_rd()

hEP0BUF[13]= spi_rd()//月

EP0BUF[14]= spi_rd()//年

spi_stop()

}

void write_ram(unsigned int address,unsigned int command)

{unsigned char addh,addl,commandh,commandl

addh=(address&0xff00)>>8

addl=address&0x00ff

commandh=(command&0xff00)>>8

commandl=command&0x00ff

spi_writedata(0x1a,addh)

spi_writedata(0x1b,addl)

spi_writedata(0x1c,commandh)

spi_writedata(0x1c,commandl)

}

unsigned int read_ram(unsigned int address)

{

unsigned char addh,addl,commandh,commandl

unsigned int command

addh=(address&0xff00)>>8

addl=address&0x00ff

spi_writedata(0x1a,addh)

spi_writedata(0x1b,addl)

commandl=spi_readdata(0x1d)

commandh=spi_readdata(0x1d)

command=(commandh<<8)+commandl

return command

}

---