DAC8802模拟SPI程序

//此程序在MSP430F5529平台上已经调试通过

#include <msp430f5529.h>
#define MSB_H P1OUT|=BIT4
#define RS_H P1OUT|=BIT5
#define MSB_L P1OUT&=~BIT4
#define RS_L P1OUT&=~BIT5
#define DAC_A      0x4000
#define DAC_B      0x8000
#define DAC_AB     0xC000
#define SCLK_UP    P2OUT|=BIT5
#define SCLK_DOWN  P2OUT&=~BIT5
#define CS_UP      P2OUT|=BIT4
#define CS_DOWN    P2OUT&=~BIT4
#define SDIN_UP    P3OUT|=BIT5
#define SDIN_DOWN  P3OUT&=~BIT5
#define LDAC_UP    P2OUT|=BIT0
#define LDAC_DOWN  P2OUT&=~BIT0
/*
* main.c
*/
int main(void) {
    WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
    P2DIR|=BIT0+BIT4+BIT5;
    P3DIR|=BIT5;
    P1DIR|=BIT4+BIT5+BIT0;
    unsigned short int date;
    volatile int i=0;
    CS_UP;
LDAC_UP;
RS_H;
MSB_H;
    while(1)
{
date=0x0ff+DAC_A;
CS_DOWN;
for(i=0;i<16;i++)
{
     SCLK_DOWN;
     if(date&0x8000)
     SDIN_UP;
     else
     SDIN_DOWN;
     SCLK_UP;
     date<<=1;
}
CS_UP;
LDAC_DOWN;
LDAC_UP;
}

}

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