標(biāo)題: MSP430單片機(jī)片內(nèi)12位DA產(chǎn)生正弦波C語(yǔ)言程序 [打印本頁(yè)]
作者: xueer    時(shí)間: 2013-7-14 16:16
標(biāo)題: MSP430單片機(jī)片內(nèi)12位DA產(chǎn)生正弦波C語(yǔ)言程序
  1. #include  <msp430x16x.h>
  2. //------------------------------------------------------------------------------
  3. // 12-bit Sine Lookup table with 32 steps
  4. //------------------------------------------------------------------------------
  5. static int Sin_tab[32] = { 0x7FF,0xA78,0xCB2,0xE77,0xF9A,0xFFE,0xF9A,0xE77,0xCB2,0xA78,0x7FF,0x586,0x34C,0x187,0x064,0x000
  6. ,0x064,0x187,0x34C,0x586};
  7. static int Cos_tab[32] = { 0xFFE,0xF9A,0xE77,0xCB2,0xA78,0x7FF,0x586,0x34C,0x187,0x064,0x000
  8. ,0x064,0x187,0x34C,0x586,0x7FF,0xA78,0xCB2,0xE77,0xF9A};

  10. void main(void)
  11. {
  12.   volatile unsigned int i;
  13.   WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  14.    //==========================選擇高頻振蕩器=======================================
  15.   BCSCTL1 &= ~XT2OFF;                       // XT2= HF XTAL
  16.    do
  17.   {
  18.   IFG1 &= ~OFIFG;                           // Clear OSCFault flag
  19.   for (i = 0xFF; i > 0; i--);               // Time for flag to set
  20.   }
  21.   while ((IFG1 & OFIFG)); //查看8M的震蕩是否穩(wěn)定  // OSCFault flag still set?
  22.   BCSCTL2 |= SELM_2 + SELS; //MCLK和SMCLK選擇XT2// MCLK= SMCLK= XT2 (safe)
  23.   //================================================================================
  24.   ADC12CTL0 = REF2_5V + REFON;//內(nèi)部基準(zhǔn)電壓      // Internal 2.5V ref
  25.   //================================================================================
  26.   DMACTL0 = DMA0TSEL_5 + DMA1TSEL_5;        // DAC12IFG trigger觸發(fā)器
  27.   DMA0SA = (int) Sin_tab;//首地址           // Source block address
  28.   DMA0DA = (int)&DAC12_0DAT; //目的地址     // Destination single address
  29.   DMA0SZ = 0x14;       //長(zhǎng)度               // Block size
  30.   DMA0CTL = DMADT_4 + DMASRCINCR_3 + DMAEN; // Rpt, inc src, word-word

  32.   DMA1SA = (int) Cos_tab;  //首地址          // Source block address
  33.   DMA1DA = (int)&DAC12_1DAT; //目的地址      // Destination single address
  34.   DMA1SZ = 0x14;       //長(zhǎng)度                // Block size
  35.   DMA1CTL = DMADT_4 + DMASRCINCR_3 + DMAEN;  // Rpt, inc src, word-word

  37.   DAC12_0CTL = DAC12LSEL_2 + DAC12IR + DAC12AMP_5 + DAC12IFG + DAC12ENC + DAC12GRP;
  38.   DAC12_1CTL = DAC12LSEL_2 + DAC12IR + DAC12AMP_5 + DAC12IFG + DAC12ENC;

  40.   CCTL1 = OUTMOD_3;//置位復(fù)位模式           // CCR1 set/reset
  41.   CCR1 = 1;    //設(shè)置占空比                 // CCR1 PWM Duty Cycle
  42.   CCR0 = 1; //設(shè)置周期                     // Clock period of CCR0
  43.   TACTL = TASSEL_2 + MC_1; //定時(shí)器A的時(shí)鐘源為SMCLK=8M，增計(jì)數(shù)模式 // SMCLK, upmode

  45.   _BIS_SR(CPUOFF);                          // CPU off
  46. }
復(fù)制代碼
作者: 水荷    時(shí)間: 2013-8-17 22:00
這個(gè)從哪個(gè)管腳輸出正弦波



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