用ATMEGA64 模拟SPI口接16为AD（ADS8345） (amobbs.com 阿莫电子技术论坛) -

bbgood 发表于 2006-4-26 08:10:56

用ATMEGA64 模拟SPI口接16为AD（ADS8345）

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

//模拟SPI口

//PE4 ---- BUSY

//PB0 ---- SS

//PB1 ---- DCLK

//PB2 ---- MOSI

//PB3 ---- MISO

//

#define set_ss() PORTB |= 0b00000001

#define set_sck() PORTB |= 0b00000010

#define set_mosi() PORTB |= 0b00000100

#define set_miso() PORTB |= 0b00001000

#define set_busy()PORTE |= 0b00010000

#define clr_ss() PORTB &= 0b11111110

#define clr_sck() PORTB &= 0b11111101

#define clr_mosi() PORTB &= 0b11111011

#define clr_miso() PORTB &= 0b11110111

#define clr_busy()PORTE &= 0b11101111

//

void delay_us(unsigned int);

void SPI_MasterInit(void);

unsigned int SPI_Read(void);

void SPI_Write(unsigned char data);

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

#include "iom64v.h"

#include "macros.h"

#include "spi.h"

/*

void SPI_Start(void)

{

clr_sck();

set_ss();

set_miso();

set_sck();

clr_ss();

}

*/

void SPI_MasterInit(void)

{

unsigned char temp;

// 设置MISO(PB3)为输入，高电平；MOSI(PB2) ，SCK(PB1) 和SS(PB0)为输出，高电平

DDRB |= 0b00000111;

DDRB &= 0b11110111;

PORTB |= 0b00001111;

// BUSY(PE4)为输入，高电平

DDRE &= 0b11101111;

PORTE |= 0b00010000;

}

//发送前：CS = 0;DCLK = 0;Din = 0;Dout = 0;

//发送后：CS = 1;DCLK = 0;Din = 0;Dout = 1;

void SPI_Write(unsigned char data)

{

int i;

set_ss();

clr_ss();

clr_sck();

clr_mosi();

clr_miso();

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

{

if(data & 0x80)set_mosi();

else clr_mosi();

delay_us(1);

clr_sck();

NOP();NOP();NOP();NOP();

delay_us(5);

data <<= 1;

set_sck();

NOP();NOP();NOP();NOP();NOP();NOP();NOP();NOP();

NOP();NOP();NOP();NOP();NOP();NOP();NOP();NOP();

}

delay_us(3);

clr_sck();

clr_mosi();

delay_us(20);

set_ss();

delay_us(10);

set_miso();

return;

}

//发送前：CS = 0;DCLK = 0;Din = 0;Dout = 0;

//发送后：CS = 1;DCLK = 0;Din = 0;Dout = 1;

unsigned int SPI_Read()

{

int i,recData;

recData = 0;

clr_ss();

clr_sck();

clr_mosi();

clr_miso();

delay_us(2);

for(i=0;i<24;i++)

{

set_sck();

NOP();NOP();NOP();NOP();NOP();

delay_us(5);

clr_sck();

delay_us(4);

if(PINB&0b00001000)recData |= 0x01;

else recData &= 0xfffe;

if(i<16)recData <<= 1;

}

delay_us(10);

set_ss();

return recData;

}

void delay_us(unsigned int n)

{

unsigned int i;

for(i=0;i<n;i++)

{

;

}

return;

}

/*************************main.c***************************/

include "iom64v.h"

#include "macros.h"

#include "main.h"

#include "spi.h"

unsigned char ctrlByte;

unsigned int adData;

/****************FUNCTION*******************/

void delay_1ms(void);

void delay_ms(unsigned int);

void variable_init(void);

void USART_init(void);

unsigned char USART_Receive(void);

void USART_Transmit(unsigned char data);

#pragma interrupt_handler uartrx_isr:19 //UART接收结束中断

void main(void)

{

unsigned char i = 0;

float f;

SPH = 0x0f;

SPL = 0xd0;

CLI();

variable_init();

USART_init();

SPI_MasterInit();

SEI();

while(1)

{

ctrlByte = 0b11000100; //ch 1，single-ended,16位分辨率，

SPI_Write(ctrlByte);

delay_us(20);

adData = SPI_Read();

i = adData&0xff;

USART_Transmit(i);

adData >>= 8;

i = adData&0xff;

USART_Transmit(i&0xff);

delay_ms(1000);

}

}

void delay_1ms(void)

{

unsigned int i;

for(i=0;i<2286;i++)//(XTAL*143-2)

{

;

}

}

void delay_ms(unsigned int n)

{

unsigned int i;

for(i=0;i<n;i++)

{

delay_1ms();

}

}

void USART_init(void)

{

/* 设置波特率 */

UBRR0L = 103;//(fosc/16/baud-1)%256;

UBRR0H = 0;//(fosc/16/baud-1)/256;

/* 接收器与发送器使能,允许接收 */

UCSR0B = (1<<RXCIE0)|(1<<RXEN0)|(1<<TXEN0);//

/* 设置帧格式:偶校验，1位停止位，8位数据位 */

UCSR0C = (1<<UPM01)|(3<<UCSZ00);

}

void uartrx_isr(void)

{

unsigned char i;

CLI();

UCSR0B &= 0x7f;

i = USART_Receive();

SEI();

UCSR0B |= 0x80;

}

void USART_Transmit(unsigned char data)

{

/* wait for empty transmit buffer */

while(!(UCSR0A & 0x20))

{

;

}

/* put data into buffer,sends the data */

UDR0 = data;

}

unsigned char USART_Receive(void)

{

/* wait for data to be received */

while(!(UCSR0A & 0x80))

{

;

}

/* get and return received data from buffer */

return UDR0;

}

void variable_init()

{

adData = 0;

}

-----此内容被bbgood于2006-04-26,08:24:14编辑过

linmch 发表于 2006-10-27 11:03:26

谢谢分享，好东西，先谢了！

hl0716 发表于 2008-3-23 14:25:57

不错,记号,这个ad怎么样啊

spy2008 发表于 2008-3-23 17:45:40

mark

ivension 发表于 2008-4-1 11:51:25

mark

hetao7241 发表于 2008-4-1 13:47:44

这个AD和AD7705相比,那个要好一些,抗共模干扰,速度?

ivension 发表于 2008-4-2 08:37:28

mark..

flashnana 发表于 2008-4-29 16:13:01

unsigned int SPI_Read()
{
   int i,recData;
   recData = 0;
   clr_ss();
   clr_sck();
   clr_mosi();
   clr_miso();
   delay_us(2);
   for(i=0;i<24;i++)
   {
            set_sck();
            NOP();NOP();NOP();NOP();NOP();
            delay_us(5);
            clr_sck();
            delay_us(4);
            if(PINB&0b00001000)recData |= 0x01;
            else recData &= 0xfffe;
            if(i<16)recData <<= 1;
   }
   delay_us(10);
   set_ss();
   return recData;
}
这个函数看不懂，为什么读是i<24个循环，而在i<16的时候对recData进行处理，其余的不处理？

gerbee 发表于 2008-4-29 18:29:28

请问这个ad价格多少？供货稳定不

yibin818 发表于 2008-4-29 18:35:10

记号

ledatou 发表于 2011-4-6 11:26:37

哇塞～这个东西好啊～mark?

wisdom9285 发表于 2011-5-21 16:59:24

谢谢分享！！！

zztbb868 发表于 2011-6-26 14:58:32

mark

fengyuehaoran 发表于 2011-8-27 09:54:04

回复【7楼】flashnana梁娅娜
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(原文件名:未命名.jpg)

xingzhong 发表于 2012-2-10 15:14:05

回复【13楼】fengyuehaoran 风月浩然
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mark

dashuai145 发表于 2013-1-22 13:51:02

借用一下

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用ATMEGA64 模拟SPI口接16为AD（ADS8345）