www.pudn.com > main.rar > main.cpp
#includevoid Init_ADC(void); void Init_TimerB(void); void Init_UTR(void); void Init_CLK(void); int ADC12buf = 0; int sign = 0; /* Current adpcm sign bit */ unsigned int delta = 0; /* Current adpcm output value */ int diff = 0; /* Difference between val and valprev */ int step = 0; /* Stepsize */ long valpred = 0 ; /* Predicted output value */ long vpdiff = 0; /* Current change to valpred */ int index = 0; /* Current step change index */ unsigned int outputbuffer = 0; /* place to keep previous 4-bit value */ int bufferstep = 1; /* toggle between outputbuffer/output */ // int j = 0; // static short test[10] = {0,0,1,2,4,6,9,12,16,20}; static short test = 0; static int myi = -1; static int ll = 0; static int indexTable[16] = { -1, -1, -1, -1, 2, 4, 6, 8, -1, -1, -1, -1, 2, 4, 6, 8, }; static char wavarray[906]={ 0x80,0x85,0x96,0xA8,0xB6,0xB7,0xA8,0x8D,0x7E,0x7B,0x88,0x9C,0xA0,0x90,0x6C,0x54, 0x4D,0x56,0x62,0x5C,0x4C,0x2E,0x1D,0x24,0x3B,0x4F,0x4E,0x4B,0x45,0x4B,0x61,0x8C, 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22385, 24623, 27086, 29794, 32767 }; int main() { // 关闭看门狗 WDTCTL = WDTPW + WDTHOLD; // 关闭中断 _DINT(); Init_ADC(); Init_TimerB(); Init_CLK(); Init_UTR(); // 打开中断 _EINT(); //中断处理完成后就关闭CPU,进入低功耗状态 for(;;) { // Enter LPM0 w/ interrupt _BIS_SR(CPUOFF + GIE); } } //选择MCLK,SMCLK的时钟源为XT2 void Init_CLK(void) { unsigned int i; //启动XT2震荡器 BCSCTL1 &= ~XT2OFF; // 清除OSCFault标志 do { IFG1 &= ~OFIFG; for (i = 0x20; i > 0; i--); } while ((IFG1 & OFIFG) == OFIFG); //MCLK 的时钟源为XT2，分频因子为1 , DIVM0 //SMCLK的时钟源为XT2，分频因子为1, DIVS0 //XT2的频率范围是450KHz到8MHz， //XT2的频率是7.3728MHz，所以SMLK也是7.3728MHz BCSCTL2 = SELM_2 + SELS ; } //TimerB 是ADC的采样时钟 void Init_TimerB(void) { // 选择SMCLK，清除TAR //modified，可能没有分频，等于SMCLK TBCTL = TBSSEL_2 + TBCLR; //TB输出频率为：8192HZ＝7.3728MHz/900 // TBCCR0 = 900; //TBCCR1 = 450; TBCCR0 = 450; TBCCR1 = 225; //CCR1 Compare mode //TBCL0-TBCL1等于方波的1宽,TBCL1等于0宽，周期还是TBCL0 TBCCTL1 = OUTMOD_3 ; // 增记数模式 //TBCTL |= MC0; TBCTL |= MC1;//MODIFIED } void Init_ADC(void) { //P6.0 ADC option select P6SEL = 0x08; //设置ENC为0，从而修改ADC12寄存器的值 ADC12CTL0 &= ~(ENC); //单通道通道重复模式 //转换内核时钟SMCLK //转换时钟8分频：7.3728MHz/8=921.6KHz，近1M， //而转换频率是：921.6KHz/13=70.892kHz //采样输入时钟信号 ：SHS_3是TimerB_1 ADC12CTL1 = CONSEQ_2 + ADC12SSEL_3 + ADC12DIV_7 + SHS_3 + SHP; //转换的起始地址为：ADCMEM0 //ADC12CTL1 |= CSTARTADD_0; ADC12CTL1 |= CSTARTADD_3; // Enable ADCIFG15 interrupt //转换完成中断使能 ADC12IE = 0x0001; //设置参考电压分别为AVSS和AVCC，输入通道为A3 ADC12MCTL0 = INCH_3 + EOS + SREF_1; //采样周期=SAMPCON, SHT00 //ADC12CTL0 |= ADC12ON + SHT00 + SHT01 + SHT02 + REFON; //MODIFIED //SHT00表示ADCMEM0采样周期是采样时钟周期的4倍 //那采样频率为：(TimerB时钟)8192HZ/4=2048HZ //可以看出转换频率是采样频率的35倍，所以时间可以忽略不计 ADC12CTL0 |= ADC12ON + SHT00 + REFON; //ADC12CTL0 |= MSC;//to modify //使能ADC转换 ADC12CTL0 |= ENC; return; } // 定时器中断，完成 ADC 转换 #pragma vector=ADC_VECTOR __interrupt void ADC12_ISR (void) { // ADC12buf = ADC12MEM0; ADC12buf = ADC12MEM3; test = ADC12buf; /*myi=myi+1; // if(myi>10) {myi=1; } // test = (myi*myi); if(myi>905) {myi=0;} test = wavarray[myi]; //test = test*8; //test = 0x12; // while (!(IFG2 & UTXIFG1)); // USART0 TX buffer ready? // TXBUF1 = test & 0xff;*/ test = test*8; step = stepsizeTable[index]; diff = test - valpred; sign = (diff < 0) ? 8 : 0; if ( sign ) diff = (-diff); // Step 2 - Divide and clamp delta = 0; vpdiff = (step >> 3); if ( diff >= step ) { delta = 4; diff -= step; vpdiff += step; } step >>= 1; if ( diff >= step ) { delta |= 2; diff -= step; vpdiff += step; } step >>= 1; if ( diff >= step ) { delta |= 1; vpdiff += step; } // Step 3 - Update previous value if ( sign ) valpred -= vpdiff; else valpred += vpdiff; // Step 4 - Clamp previous value to 16 bits if ( valpred > 32767 ) valpred = 32767; else if ( valpred < -32768 ) valpred = -32768; // Step 5 - Assemble value, update index and step values delta |= sign; index += indexTable[delta]; if ( index < 0 ) index = 0; if ( index > 88 ) index = 88; step = stepsizeTable[index]; if ( bufferstep ) { //TXBUF1=0; outputbuffer = (delta << 4) & 0xf0; } else { outputbuffer |= (delta & 0x0f) ; //缓冲区为空时写入下一个值 while (!(IFG2 & UTXIFG1)); // USART0 TX buffer ready? TXBUF1 = outputbuffer & 0xff; } bufferstep = !bufferstep; // Clear CPUOFF bit from 0(SR) _BIC_SR_IRQ(CPUOFF); } void Init_UTR(void)//设串口一控制寄存 { //串口baud rate：？ //当采样，转换，压缩完成后，往串口发送缓冲区中发送一个值；当缓冲区满时，产生一个中断，发送 //数据发完，中断标志清0 //必须保证采样的速度小于发送的速度，不然当标志没有清0的时候，中断中写了while语句，会等待 //允许软件复位 UCTL1 |= SWRST; P3SEL |= 0xC0; //串口发送和接收使能 ME2 |= UTXE1 + URXE1; //停止位1位 UCTL1 &= ~SPB; //奇偶校验位无 UCTL1 &= ~PENA; //数据位长度：8位 UCTL1 |= CHAR; //串口发送时钟源选择：ACLK＝32,768 Hz // UTCTL1 |= SSEL1 ; //MODIFIED //串口发送时钟源选择：SMCLK＝7.3728MHz, 则N=7.3728MHz/115200=64 UTCTL1 |= 0x30 ; //波特率=115200,N=7.3728MHz/115200=64 UBR01 = 0x40; //UBR01 = 0xC0;//38400 UBR11 = 0x00; UMCTL1 = 0x00; //不允许软件复位 UCTL1 &= ~SWRST; //接收中断使能 IE2 |= URXIE1; TXBUF1 = 0;//modified by daniel }