[求助] msp430+DMA+按键中断设置

dsc19881112 2017-12-28 14:05 楼主

想通过查表的方式用单片机产生一个正弦波信号通过按键中断调整但是进不了按键中断求解
#include
#define _DAC12_0DAT_ 0x01C8                // Physical address of
static int Sin_tab[32] = {
      2048,
      2447,
      2831,
      3185,
      3495,
      3750,
      3939,
      4056,
      4095,
      4056,
      3939,
      3750,
      3495,
      3185,
      2831,
      2447,
      2048,
      1648,
      1264,
      910,
      600,
      345,
      156,
      39,
      0,
      39,
      156,
      345,
      600,
      910,
      1264,
      1648
};
void key_init(void);
void delay(long int x)
{
long int i;
for(i=0;i }
void InitSys()
{
unsigned int iq0;
BCSCTL1&=~XT2OFF;      //打开XT2振荡器
do
{
      IFG1 &= ~OFIFG;    // 清除振荡器失效标志
      for (iq0 = 0xFF; iq0 > 0; iq0--);          // 延时，等待LFXT1起振
}
while ((IFG1 & OFIFG) != 0);          // 判断LFXT1是否起振
BCSCTL2 |=SELM_2+SELS;      //选择MCLK
}
int main(void)
{
int temp=0;
   WDTCTL = WDTPW + WDTHOLD;    //Disable the Watchdog
      void InitSys();
key_init();
delay(240000);
   ADC12CTL0 = REFON;                      // Internal ref
   DMA0SA = (int) Sin_tab;                // Source block address
   DMA0DA = (unsigned int)&DAC12_0DAT;    // Destination single address
   DMA0SZ = 0x20;                         // Block size
   DMACTL0 = DMA0TSEL_5;                   // DAC12IFG trigger
   DMA0CTL = DMADT_4 + DMASRCINCR_3 + DMAEN; // Rpt, inc src, word-word
   DAC12_0CTL = DAC12LSEL_2 + DAC12IR + DAC12AMP_5 + DAC12IFG + DAC12ENC; // Config
CCTL1 = OUTMOD_3;                      // Set/reset
   TACCR1 = 1;                            // PWM Duty Cycle
   TA0CCR0 = 6;                         // 4M晶振:0x37,8M晶振:0x6f
   TA0CCTL0 = CCIE;                      // TA0CCR0捕获/比较中断寄存器中断使能
   _EINT();
      }
}
//==============================================================================
void key_init(void)
{
      P2DIR &=0xC3; //设置端口为输入
P2IES|=0x30; //下降沿触发
P2IE |=0x30; //P2.4 P2.5允许中断
         }
//==============================================================================

#pragma vector =PORT2_VECTOR
__interrupt void Port_2(void)
{ unsigned char q0=0;
   if ((P2IFG&BIT5)==BIT5)
      {  P2IFG&=0x00;
            temp++;
         q0=1;
      }
   else if ((P2IFG&BIT4)==BIT4)
      {  P2IFG&=0x00;
            temp--;
         q0=1;
      }
   else
   {
   P2IFG=0;
   }
   if (q0==1)
   {
      P2IE=~ 0x00;
   }
   _DINT();
}