C8051F定义了DAC的值，当上位机来命令时，DAC输出几V点压，但是控制不了?

ID:478255 · 发表于 2019-4-10 14:07

主函数
#include <c8051f330.h>                // SFR declarations
#include "string.h"
#include <stdio.h>

#include "SPI.h"
#include <intrins.h>

unsigned char  index = 1;
unsigned char buf[2];
unsigned char flag = 0;
unsigned char UART_RX_idx = 0;
void re(unsigned char a);

void delay(unsigned long delaytime)
{
            for(;delaytime>0;delaytime--)
            _nop_();
}

void delay10000(unsigned long delaytime)
{
      unsigned long i;
      for(;delaytime>0;delaytime--)
      for(i = 0;i <10000;i++)
      _nop_();
}

void UART_Init()
{
            EA = 0;
            SCON0    = 0x50;
            TCON    = 0x40;
            TMOD    = 0x20;
            TH1    = 0x96;
            CKCON    = 0x00;

            TR1 = 1;
            ET0= 1;
            ES0 =1;
            TI0 = 0;
            RI0 = 0;
            EA = 1;
            UART_RX_idx = 0;
            RXflage = 0;
}

void Send_data(unsigned char dat)
{
            SBUF0 = dat;
            TI0 = 1;
            delay(10);
            while(!TI0);
}

void uart() interrupt 4
{
      unsigned char aa;

      if(RI0)
      {
            EA = 1;
            RI0 = 0;
            aa = SBUF0;
            re(aa);

      }
}

void re(unsigned char a)
{
      switch(index)
      {
            case 1://正在等待接受0xaa
                     if(a == 0xaa)
                     {
                              //继续接受0x55；
                              index++;
                     }
                     else
                     {
                              index =0;
                     }
                     break;
            case 2:
                     {
                              if(a == 0x55)
                              {
                              //继续接受0x55；
                                    index++;
                              }
                              else
                              {
                                    index =0;
                              }
                     }
                     break;
            case 3:
                     {
                              buf[0] = a;
                              index++;
                     }
                     break;
            case 4:
                     {
                              buf[1] = a;
                              index++;
                     }
                     break;
            case 5:
                     if(a == '$')
                     {
                              index++;
                     }
                     else
                     {
                              index =0;
                     }
                     break;
            case 6:
                     if(a == '&')
                     {
                              flag = 1;
                     }
                     else
                     {
                              index =0;
                     }
                     break;
      }
}

void main (void)
{
      PCA0MD &= ~0x40;
      OSCICN |= 0x03;
      XBR0 = 0x01;
      XBR1 = 0x40;
      P0MDIN |= 0x00;
      P1MDIN |= 0x00;
      P0MDOUT|= 0xff;
      P1MDOUT|= 0xff;
      UART_Init();
      delay10000(20);
      init_dac8562();
  cfg_dac8562_1();
      {
            while(1)
            {
                     if(flag == 1)
                     {
                              cfg_dac8562_1(buf[0]*256+buf[1]);
                              flag = 0;
                     }
            }
      }
}

dac设置

#include <C8051F120.H>
#include "SPI.h"
#include "intrins.h"

unsigned char RX_dat[20];
unsigned char RXflage;
unsigned long  Rx_Freq;
unsigned long  HMC704_03;
double temp;
unsigned long temp_ulong;
unsigned long cfgdat;

void Set8562(unsigned long datin)
{
      unsigned long dat;
      unsigned char i = 0;
      unsigned char ii = 0;

      DAC8562_CS = 0;
      dat = datin;
      dat = dat << 8;
      for(i = 0;i < 24;i++)
      {
            DAC8562_CLK = 1;
            DAC8562_DAT = dat & 0x80000000;
            dat = dat << 1;
            DAC8562_CLK = 0;
      }
      DAC8562_DAT = 0;
      DAC8562_CLK= 0;
      dat = dat << 1;
      DAC8562_CS = 1;
}

void init_dac8562()
{
      cfgdat = 0x380001;
      Set8562(cfgdat);

      cfgdat = 0x184000;
      Set8562(cfgdat);

      cfgdat = 0x194000;
      Set8562(cfgdat);
}

void cfg_dac8562_1(unsigned long datin)
{
                     cfgdat = 0x180000+datin;

                     Set8562(cfgdat);
}

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