spi接口的Verilog程序

module

spi_mosi(rst,clk,rd,wr,datain,

spics,spiclk,spido,spidi,dataout);

input

rst;

//置位信号，低有效

input

clk;

//时钟信号

input

rd;

//接收数据命令

input

wr;

//发送数据命令

input

spidi;

//SPI数据输入信号

input

[7:0]

datain;

//发送数据输入

output

spics;

//SPI片选信号

output

spiclk;

//SPI时钟信号

output

spido;

//SPI数据输出信号

output

[7:0]

dataout;

//接收数据输出

reg

spics;

reg

spiclk;

reg

spido;

reg

[7:0]

dstate,

dsend,dataout,dreceive

;//,cnt;

reg

[1:0]

spistate;

parameter

idle

=

2'b00;

parameter

send_data

=

2'b01;

parameter

receive_data

=

2'b10;

initial

begin

spics

<=

1'b1;

spiclk

<=

1'b1;

spido

<=

1'b1;

end

always

@(posedge

clk)

begin

if(!rst)

begin

spistate

<=

idle;

//

cnt

<=

8'd0;

spics

<=

1'b1;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd0;

end

else

begin

case

(spistate)

2'b00:

begin

//

spics

<=

1'b1;

//

spiclk

<=

1'b1;

//

spido

<=

1'b1;

//

if(cnt

==

8'd0)

//

begin

//

cnt

<=

8'd0;

if((wr

==

1'b0)

&&

(rd

==

1'b1))

//发送资料转换

begin

spistate

<=

send_data;

dstate

<=

8'd0;

dsend

<=

datain;

end

else

if((wr

==

1'b1)

&&

(rd

==

1'b0))

//接收数据转换

begin

spistate

<=

receive_data;

dstate

<=

8'd0;

end

else

begin

spistate

<=

idle;

dstate

<=

8'd0;

end

//

end

//

else

//

begin

//

cnt

<=

cnt

+

8'd1;

//

end

end

2'b01:

//发送数据状态

begin

case

(dstate)

8'd0:

//产生片选信号有效

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd1;

end

8'd1:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd2;

end

8'd2:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

1'b1;

dstate

<=

8'd3;

end

8'd3:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[7];

//发送数据最高位

dstate

<=

8'd4;

end

8'd4:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[7];

dstate

<=

8'd5;

end

8'd5:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[6];

dstate

<=

8'd6;

end

8'd6:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[6];

dstate

<=

8'd7;

end

8'd7:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[5];

dstate

<=

8'd8;

end

8'd8:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[5];

dstate

<=

8'd9;

end

8'd9:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[4];

dstate

<=

8'd10;

end

8'd10:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[4];

dstate

<=

8'd11;

end

8'd11:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[3];

dstate

<=

8'd12;

end

8'd12:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[3];

dstate

<=

8'd13;

end

8'd13:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[2];

dstate

<=

8'd14;

end

8'd14:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[2];

dstate

<=

8'd15;

end

8'd15:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

dsend[1];

dstate

<=

8'd16;

end

8'd16:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[1];

dstate

<=

8'd17;

end

8'd17:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

//发送最低位数据

spido

<=

dsend[0];

dstate

<=

8'd18;

end

8'd18:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

dsend[0];

//spiclk的下降沿让最低位数据被读取

dstate

<=

8'd19;

end

8'd19:

//置片选信号无效

begin

spics

<=

1'b1;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd20;

end

8'd20:

begin

spics

<=

1'b1;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd0;

spistate

<=

idle;

end

default

begin

spics

<=

1'b1;

spiclk

<=

1'b1;

spido

<=

1'b1;

spistate

<=

idle;

end

endcase

end

2'b10:

//接收数据状态

begin

case

(dstate)

//片选信号有效

8'd0:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd1;

end

8'd1:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd2;

end

8'd2:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

spido

<=

1'b1;

dstate

<=

8'd3;

end

8'd3:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd4;

end

8'd4:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

//紧接着上升沿的下降沿数据被读取

dreceive[7]

<=

spidi;

//接收数据最高位

dstate

<=

8'd5;

end

8'd5:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd6;

end

8'd6:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[6]

<=

spidi;

dstate

<=

8'd7;

end

8'd7:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd8;

end

8'd8:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[5]

<=

spidi;

dstate

<=

8'd9;

end

8'd9:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd10;

end

8'd10:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[4]

<=

spidi;

dstate

<=

8'd11;

end

8'd11:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd12;

end

8'd12:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[3]

<=

spidi;

dstate

<=

8'd13;

end

8'd13:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd14;

end

8'd14:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[2]

<=

spidi;

dstate

<=

8'd15;

end

8'd15:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd16;

end

8'd16:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[1]

<=

spidi;

dstate

<=

8'd17;

end

8'd17:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

dstate

<=

8'd18;

end

8'd18:

begin

spics

<=

1'b0;

spiclk

<=

1'b0;

dreceive[0]

<=

spidi;

//接收数据最低位

dstate

<=

8'd19;

end

8'd19:

begin

spics

<=

1'b0;

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd20;

dataout<=

dreceive;

end

8'd20:

begin

spics

<=

1'b1;

//片选信号无效

spiclk

<=

1'b1;

spido

<=

1'b1;

dstate

<=

8'd0;

spistate

<=

idle;

end

endcase

end

default:

begin

spics

<=

1'b1;

spiclk

<=

1'b1;

spido

<=

1'b1;

spistate

<=

idle;

end

endcase

//对应上面的发送数据情形

end

//对应上面的RST没有按下的情形

end

//对应最上面的always@(posedge

clk)

endmodule

你好：

MISO=1；是吧MISO这个脚置为输入。

byte |= MISO; 是吧byte的最低位或上MISO接收到的电平数据。

这是吧byte的最低位赋值，但是上边有一句byte = (byte << 1);这样吧byte左移一位，下次再赋值时，byte的最低位就是新的一个数据了。

不懂的回复。

希望我的回答能帮助到你。

STC89C52RC单片机是没有硬件SPI功能的，是需要模拟的。普通的I/O即可模拟的。给你一个参考程序：\x0d\//-----------------------函数声明，变量定义-------------------------------------------------------- \x0d\#include \x0d\#include \x0d\sbit SCK=P1^0; // 将p10口模拟时钟输出 \x0d\sbit MOSI=P1^1; // 将p11口模拟主机输出 \x0d\sbit MISO=P1^2; // 将p11口模拟主机输入 \x0d\sbit SS1=P1^3; // 将p11口模拟片选 \x0d\#define delayNOP(); {_nop_();_nop_();_nop_();_nop_();}; \x0d\//-------------------------------------------------------------------------------------------------- \x0d\// 函数名称： SPISendByte \x0d\// 入口参数： ch \x0d\// 函数功能： 发送一个字节 \x0d\//-------------------------------------------------------------------------------------------------- \x0d\void SPISendByte(unsigned char ch) \x0d\{ \x0d\unsigned char idata n=8; // 向SDA上发送一位数据字节，共八位 \x0d\SCK = 1 ; //时钟置高 \x0d\SS1 = 0 ; //选择从机 \x0d\while(n--) \x0d\{ \x0d\delayNOP(); \x0d\SCK = 0 ; //时钟置低 \x0d\if((ch&0x80) == 0x80) // 若要发送的数据最高位为1则发送位1 \x0d\{ \x0d\MOSI = 1; // 传送位1 \x0d\} \x0d\else\x0d\{ \x0d\MOSI = 0; // 否则传送位0 \x0d\} \x0d\delayNOP(); \x0d\ch = ch回答于 2022-11-17

可以的，但SPI接口的器件有多种工作方式，如高位在前还是低位在前，空闲时时钟线高电平还是低电平

第一个跳变沿还是第二个跳变沿数据有效，程序是不同的，下面程序供参考

sbit CLK=P2^2;

sbit MOSI=P2^3; //发送方方管脚配置

sbit MISO=P2^4;

sbit BIT0=ACC^0;

sbit BIT7=ACC^7;//

void Write(uchar byte)//写数据

{

uchar i;

ACC=byte;

i=8;

while(i)

{

MOSI=BIT7;

CLK=1; // output 'uchar', MSB to MOSI

_nop_();

_nop_(); // shift next bit into MSB

_nop_();

_nop_();

ACC<<=1;

CLK=0; // Set SCK high

i--; // then set SCK low again

_nop_();

}

}

/

/函数：Read(uchar reg)

/功能：NRF24L01的读时序

//

uchar Read(void)

{

uchar i;

i=8;

sbit BIT0=ACC^0;

sbit BIT7=ACC^7;

while(i)

{

CLK=1; // output 'uchar', MSB to MOSI

_nop_();

_nop_();

_nop_();

_nop_(); // shift next bit into MSB

ACC<<=1;

BIT0=MISO ;

CLK=0; // Set SCK high

i--; // then set SCK low again

_nop_();

//led1=~led1;

}

return ACC; // return register value

}

传送的参数为什么要用void型啊？address用uint32_t不行么？data用uint8_t不行么？

还有，在写入或读出数据的时候别干多余的事情，把sprintf和lcd_print删掉。

以上就是关于spi接口的Verilog程序全部的内容，包括:spi接口的Verilog程序、nrf24l01的GPIO的模拟SPI,程序MISO=1; byte |= MISO;这里是个什么意思。、stc89c52rc单片机具有硬件SPI功能吗不具有的话如何模拟spi等相关内容解答，如果想了解更多相关内容，可以关注我们，你们的支持是我们更新的动力！