spi数据能用fpga的fftip核处理吗

能。spi是串行外设接口的缩写，是一种高速的，全双工，同步的通信总线，并且在芯片的管脚上只占用四根线。fpga的fftip核支持所有的主流XilinxFPGA芯片，适用于spi数据的芯片配置。FPGA是在PAL（可编程阵列逻辑）、GAL（通用阵列逻辑）等可编程器件的基础上进一步发展的产物。

1.定义三个gpio: p0-sclk, p1-sdi, p2-sdo；p0用于模拟spi的clock，p1用于接收数据，p2用于f发送数据；硬件上单片机A的p0接单片机B的p0，A的p1接B的p2，A的p2接B的p1

2.发送程序：clock拉低，sdo输出0或1（数据），延时一定时间，clock拉高，延时一定时间，这样A就发送一位数据到B，循环8次就发送一个字节数据

3.接收程序：检测clock状态，如果为低，就读取sdi，直到clock拉高，结束该次输入，重复8次，读取一个字节

注意：

1。clock空闲状态为高，发送数据就拉低；

2.还需要加入起始停止同步协议，可根据需要进行完善

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

}

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