求助8051f340和AD7732

249863865

求助8051f340和AD7732 [复制链接]

哪位大虾用过8051f340和AD7732，我想用单片机控制AD，没弄明白啊，想用SPI

lixiaohai8211

不知道8051f340是否得SPI，如有直接接上按AD7732的datasheet操作就可以了；没有就软件模拟，好好看看AD7732的时序就可以了。

249863865

8051F340有SPI，而且接法是标准3线式的，数据能发出去，从示波器上都能看到，但AD就是不动作，网上给的AD7734的例子应该也不对。AD7732的时序模拟的我感觉没啥问题，可能还是有什么地方没看明白吧！我一会把自己写的代码发下，请大家帮我看下，谢谢

249863865

#include
#include                // SFR declarations
//-----------------------------------------------------------------------------
unsigned char t;
unsigned char k;
unsigned char rr[];
unsigned char aa[];
sbit RDY=P0^3;
sbit ADCS=P0^7;
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void)
{
OSCICN = 0x80;                         // Configure internal oscillator for
}
//-----------------------------------------------------------------------------
void delay(int n)
{
char j;
for(j=0;j {;
}
}
void PORT_Init (void)
{
  XBR0    = 0x02;                   // sclk digital peripherals selected
  XBR1    = 0x40;                   // Enable crossbar and weak pull-ups
  P0MDOUT |= 0xFF;                   // Enable p0 as  push-pull output
  P1MDOUT |= 0xFF;                   // Enable p1 as  push-pull output
  P2MDOUT |= 0xFF;                   // Enable p2 as  push-pull output
  P3MDOUT |= 0xFF;                   // Enable p3 as  push-pull output
  P4MDOUT |= 0xFF;
}
//-----------------------------------------------------------------------------
void SPI0_Init (void)
{
  SPI0CKR=0x07;
  NSSMD0=0;
  SPIEN=1;
  SPI0CFG|=0x70;
}
//-----------------------------------------------------------------------------
void write(unsigned char bb )
{
ADCS=0;
SPI0DAT=bb;
// for(;SPI0CFG&0x80;)
//    {
//    }
ADCS = 1;
delay(5);
}
//-----------------------------------------------------------------------------
char read(void)
{
char temp;
ADCS=0;
temp=SPI0DAT;
// for(;SPI0CFG&0x01;)
//    {
//    }
ADCS = 1;
return temp;
}
//-----------------------------------------------------------------------------
void main (void)
{
PCA0MD &= ~0x40;                      // WDTE = 0 (clear watchdog timer  enable)
OSCILLATOR_Init();                   // Initialize system clock
PORT_Init();                         // Initialize crossbar and GPIO
SPI0_Init();
EA=1;
ADCS = 1;
write(0x38);
if(WCOL)//写冲突处理，暂无处理
WCOL=0;
write(0x48);
if(WCOL)//写冲突处理，暂无处理
WCOL=0;
write(0x48);

/**/
for(;RDY==0;)
{

P1=read();
P2=read();
P3=read();
// }
}
}

249863865

:( 本来也有个自己仿时序的想法，仿完了还可以，不过AD7732有个时间限制很愁人SCLK上升沿时间和总线释放时间最大80ns，最小10ns。大家用AD的时候片选信号不用是不是也可以？CS直接接地。但是控制时序的时间要求中又有对CS下降沿到数据有效的时间要求，最小0ns，最大60ns，请用过的高手帮我看看，我的QQ号是249863865

249863865

/*********************************************************************

Author       : ADI - Apps          www.analog.com/MicroConverter

Date       : September 2003

File       : AD7734.c

Hardware    :  ADUC832 is used to control ad7734.The core clock of ADUC832 is 2.097152MHZ.

Description :

*********************************************************************/

#include
#include
/******************************************************************
DEFINE CONTROL PINS OF ADUC832 FOR THE PURPOSE OF AD7734 CONTROL.
Customers should define the pins according to their design.
If P0 is used as the control port, pull-up resistors should be added to each pin of P0.
******************************************************************/
sbit CS=0x0A4;
sbit DIN=0x0A5;
sbit DOUT=0x0B4;
sbit DRDY=0x0B3;
sbit RESET=0x0A6;
sbit SCLOCK=0x0A7;
int sig;
void int0_int() interrupt 0{
sig=0;
return; }
void writetoreg(unsigned char);
void readfromreg(int);
void read(int);
void main()
{
int tim;

/* Set up UART */
T3CON = 0x082;
T3FD = 0x02D;
SCON = 0x052;
tim=1000;
/* PRECONFIGURE...*/
RESET=0;
while(tim--);
RESET=1;
SCLOCK=1;
DIN=1;
DOUT=1;
CS=1;
DRDY=1;
printf("\n");
writetoreg(0x28); //write to communication register. The next step is writing to channel setup register
writetoreg(0x08); //enable the channel AIN0, the input voltage range is +5V
writetoreg(0x30); //write to communication register. The next step is writing to channel conversion time register
writetoreg(0x91); //chop enabled, and the update rate is 2534Hz
/*writetoreg(0x38);//write to communication register . The next step is writing to MODE register
writetoreg(0x82);//ADC zero-scale calibration, 24 bit mode

while(DRDY);
printf("self zero-scale calibration finished.\n");
IT0=1;
EA=1;
EX0=1;
sig=1;
while(sig);*/
/*writetoreg(0x38);//write to communication register . The next step is writing to MODE register
writetoreg(0x0C2);//channel zero-scale calibration,24 bit mode
while(DRDY);
printf("channel zeroscale calibration finished.\n");
sig=1;
while(sig);
writetoreg(0x38);//write to communication register. The next step is writing to MODE register
writetoreg(0x0D2);//system full-scale calibration
while(DRDY);
printf("channel full-scale calibration finished.\n");

sig=1;
while(sig);  */
writetoreg(0x44); //read from ADC status
readfromreg(8);
printf("\n");
writetoreg(0x60); //read from channel status
readfromreg(8);
printf("\n");
writetoreg(0x68); //read from channel setup
readfromreg(8);
printf("\n");
writetoreg(0x70); //read from channel conversion
readfromreg(8);
printf("\n");
writetoreg(0x78);//read from mode register
readfromreg(8);
printf("\n");
writetoreg(0x46);//read from adc zero-scale
readfromreg(24);
printf("\n");
writetoreg(0x50);//read from channel zero-scale
readfromreg(24);
printf("\n");
writetoreg(0x58);//read from channel full-scale
readfromreg(24);
printf("\n");

writetoreg(0x38);//writing to communication register, the next step is write to MODE register
writetoreg(0x22);//continuous conversion mode

read(200);
}

void writetoreg(byteword)
unsigned char byteword;

{
unsigned char temp;
int i;

CS=0;
temp=0x80;
for(i=0;i<8;i++)
{
if((temp&byteword)==0)
   DIN=0;
else DIN=1;
   SCLOCK=0;
   SCLOCK=1;
temp=temp>>1;
}
CS=1;
}

void readfromreg(bytenumber)
int bytenumber;
{
int j;
unsigned char temp1;
DIN=0;
CS=0;
temp1=0x00;
for(j=0;j      {
     SCLOCK=0;


        if(DOUT==0)
        temp1=temp1<<1;
   else
   {temp1=temp1<<1;
   temp1=temp1+0x01;}
      if(j==7||j==15||j==23)
      { printf("%02BX",temp1);
         temp1=0x00;
         }
SCLOCK=1;
   }
CS=1;

  }

void read(readtime)
int readtime;
{
unsigned char temp1;
int i,j;

temp1=0x00;
for(i=0;i { while(DRDY);
writetoreg(0x48);
   DIN=0;
   CS=0;
      for(j=0;j<24;j++)
     {SCLOCK=0;

        if(DOUT==0)
        temp1=temp1<<1;
   else
   {temp1=temp1<<1;
   temp1=temp1+0x01;}
   SCLOCK=1;
      if(j==7||j==15||j==23)
      { printf("%02BX",temp1);
         temp1=0x00;
         }
      }
      printf("\n");
      CS=1;

}
printf("\n\n\n");

}

249863865