spi代码（SPI编程）[20240425更新]

本篇文章给大家谈谈spi代码，以及SPI编程对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

• 1、使用一个STM32F103C8T6单片机，模拟一个SPI从机模式输出，求代码
• 2、写一个51单片机模拟SPI总线的代码
• 3、spi接口的Verilog程序
• 4、农业银行装修贷SPI222代码是什么意思
• 5、请教关于SPI的问题

使用一个STM32F103C8T6单片机，模拟一个SPI从机模式输出，求代码

void SPI_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5 | GPIO_Pin_7 ;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_SetBits(GPIOA,GPIO_Pin_4|GPIO_Pin_5 | GPIO_Pin_7);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 ;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN ;

GPIO_SetBits(GPIOA,GPIO_Pin_6);

}

void SPI_ByteWr(unsigned char WrData) //spi 写

{

unsigned char i;

GPIO_ResetBits(GPIOA,GPIO_Pin_4);

Delay(2);

GPIO_SetBits(GPIOA,GPIO_Pin_4|GPIO_Pin_5);

for(i=0;i8;i++)

{

GPIO_ResetBits(GPIOA,GPIO_Pin_5);

Delay(2);

if((WrData0x80) == 0x80)

GPIO_SetBits(GPIOA,GPIO_Pin_7);

else

GPIO_ResetBits(GPIOA,GPIO_Pin_7);

WrData = 1;

GPIO_SetBits(GPIOA,GPIO_Pin_5);

Delay(2);

}

}

unsigned char SPI_ByteRd(void)//读取一个字节

{

unsigned char i;

unsigned char RdData = 0;

for(i=0;i8;i++)

{

RdData = 1;

GPIO_ResetBits(GPIOA,GPIO_Pin_5);

Delay(2);

if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_6))

RdData|=1;

GPIO_SetBits(GPIOA,GPIO_Pin_5);

Delay(2);

}

return RdData;

}

写一个51单片机模拟SPI总线的代码

这是我复制的，一搜一大堆

#include reg52.h

sbit SPI_DI =P0^1; //MMC数据输入

sbit SPI_DO =P0^0;//MMC数据输出，可不接

sbit SPI_SCL=P0^2;//时钟线

void Write_Byte(unsigned char value)

{

unsigned char i;

for (i=0;i8;i++)

{

if (((value(7-i))0x01)==0x01)

SPI_DI=1;

else SPI_DI=0;

SPI_SCL=0;

delay(5);

//必须要加延时，否则会因为操作太快而不响应。

SPI_SCL=1;

delay(5);

//必须要加延时，否则会因为操作太快而不响应。

}

}

unsigned char Read_Byte()

{

unsigned char temp=0;

unsigned char i;

for (i=0;i8;i++)

{

SPI_DO=1;

SPI_SCL=0;

delay(5);

temp=(temp1)+(unsigned char)SPI_DO;

SPI_SCL=1;

delay(5);

}

return (temp);

}

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

农业银行装修贷SPI222代码是什么意思

说明你不符合要求。

如您申请农行网捷贷提示信息“您暂不符合贷款申请条件”，有可能是以下情况：存在逾期贷款、存在逾期透支、近24个月累计逾期期数超标等基本条件不符合要求或非相关的目标客户。错误代码包括：221、322、222、223、321、331、369。

农业银行家装贷是指已在农业银行办理按揭贷款的自然人发放的，用于其所购住房装修、购置家具家电等消费用途的信用贷款。

农业银行家装贷申请条件：

1、已在农业银行成功办理住房按揭贷款。

2、有稳定的收入来源，原则上为工薪人士。

3、申请评分须达到准入标准。

请教关于SPI的问题

flash的数据是按照sector未单位存储。 要读flash特定位置的数据，可以随便找sector来读写，最好靠后点，前面的数据是系统的。 至于确定往内存到flash的数据是否有错，可以做checksum校验，或者别的方式校验 sf - SPI flash sub-system

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