430F149 ad采样速率测试程序

mengxp

430F149 ad采样速率测试程序 [复制链接]

前几天买了个小开发板，初学430，希望和大家多多交流~

/*
* mengxp works 2015/10/28
*/
#include
#include
#define SHUTDOWN_WATCHDOG()   do{WDTCTL = WDTPW + WDTHOLD;}while(0)
#define SET_MCLK_XT2()        do{BCSCTL2 |= SELM_2;}while(0)
#define SET_SMCLK_XT2()       do{BCSCTL2 |= SELS;}while(0)
#define ENABLE_XT2()          \
do{ \
  BCSCTL1 &= ~XT2OFF; \
  do { \
    volatile unsigned int _i = 0xFF; \
    IFG1 &= ~OFIFG; \
    while(_i--); \
  }while ((IFG1 & OFIFG)); \
}while(0)
#define DEAD_LOOP()           while(1){__no_operation();}
#define WAIT_FOR_REFERENCE()  do{int _i;for(_i=0;_i<0x3600;_i++);}while(0)
void InitTimer(void)
{
  _EINT();                          //启用中断
  TACTL = TASSEL_2 + TACLR + MC_1;  //定时器时钟源为SMCLK
  TACCR0 = 7999;                    //假装8000分频得到1KHz
  TACCTL0 = CCIE;                   //允许定时器中断
}
unsigned long timer = 0;
#pragma vector=TIMERA0_VECTOR
__interrupt void TA_ISR(void)
{
  timer++;
}
void InitGPIO(void)
{
  P2DIR |= 1;
  P2OUT = 0;
}
//115200 8N1
void InitUSART0(void)
{
  P3SEL |= 0x30;            //P3.4 P3.5 USART0 TXD/RXD
  ME1 |= UTXE0 + URXE0;     //Enable USART0 TXD/RXD
  UCTL0 |= CHAR;
  UTCTL0 |= SSEL1;
  UBR00 = 69 & 0xFF;
  UBR10 = 69 >> 8;
  UMCTL0 = 0x00;
  UCTL0 &= ~SWRST;
  IE1 |= URXIE0;
}
void USART0_Tx(char x)
{
  while(!(IFG1 & UTXIFG0));
  TXBUF0 = x;
}
void USART0_Puts(char *str)
{
  while(1)
  {
    char x = *str;
    if(!x)
      break;
    USART0_Tx(x);
    str++;
  }
}
#pragma vector=USART0RX_VECTOR
__interrupt void USART0_Rx(void)
{
  if(IFG1 & URXIFG0)
  {
    char x = RXBUF0;
  }
}
unsigned long ad = 0;
void InitADC(int _SHT, int _DIV)
{
  _EINT();
  ADC12CTL0 &= ~ENC;
  P6SEL |= 0x01;      //P6.0 启用AD转换通道 A0
  ADC12CTL0 = _SHT + ADC12ON + MSC; //内部2.5V参考
  ADC12CTL1 = SHP + CONSEQ_2 + ADC12SSEL_3 + _DIV + ADC12DIV_0;
  ADC12IE = 1;
  ADC12CTL0 |= ENC;   //启用采样
  ADC12CTL0 |= ADC12SC;         //开始采样
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12_ISR(void)
{
  int i;
  ad++;
  i = ADC12MEM0;
}
void main( void )
{
  char buf[32];
  unsigned long t0 = 0;
  int sht, div;
  SHUTDOWN_WATCHDOG();
  ENABLE_XT2();
  SET_MCLK_XT2();
  SET_SMCLK_XT2();
  InitGPIO();
  InitTimer();
  InitUSART0();
  for(sht = 0; sht < 9; sht++)
  {
    for(div = 0; div < 8; div++)
    {
      InitADC(sht * SHT0_1, div * ADC12DIV_1);
      ad = 0;
      t0 = timer;
      while(timer < t0 + 1000)
      {
       _NOP();
      }
      P2OUT ^= 1;
      sprintf(buf,"SHT_%d DIV_%d %dK sample/s\r\n",div,sht,(int)(ad / 1000));
      USART0_Puts(buf);
}
  }
  DEAD_LOOP();
}

运行结果
SHT_0 DIV_0 235K sample/s
SHT_1 DIV_0 235K sample/s
SHT_2 DIV_0 156K sample/s
SHT_3 DIV_0 117K sample/s
SHT_4 DIV_0 94K sample/s
SHT_5 DIV_0 78K sample/s
SHT_6 DIV_0 67K sample/s
SHT_7 DIV_0 58K sample/s
SHT_0 DIV_1 245K sample/s
SHT_1 DIV_1 190K sample/s
SHT_2 DIV_1 126K sample/s
SHT_3 DIV_1 95K sample/s
SHT_4 DIV_1 76K sample/s
SHT_5 DIV_1 63K sample/s
SHT_6 DIV_1 54K sample/s
SHT_7 DIV_1 47K sample/s
SHT_0 DIV_2 274K sample/s
SHT_1 DIV_2 137K sample/s
SHT_2 DIV_2 91K sample/s
SHT_3 DIV_2 68K sample/s
SHT_4 DIV_2 55K sample/s
SHT_5 DIV_2 45K sample/s
SHT_6 DIV_2 39K sample/s
SHT_7 DIV_2 34K sample/s
SHT_0 DIV_3 177K sample/s
SHT_1 DIV_3 88K sample/s
SHT_2 DIV_3 59K sample/s
SHT_3 DIV_3 44K sample/s
SHT_4 DIV_3 35K sample/s
SHT_5 DIV_3 29K sample/s
SHT_6 DIV_3 25K sample/s
SHT_7 DIV_3 22K sample/s
SHT_0 DIV_4 103K sample/s
SHT_1 DIV_4 51K sample/s
SHT_2 DIV_4 34K sample/s
SHT_3 DIV_4 25K sample/s
SHT_4 DIV_4 20K sample/s
SHT_5 DIV_4 17K sample/s
SHT_6 DIV_4 14K sample/s
SHT_7 DIV_4 12K sample/s
SHT_0 DIV_5 73K sample/s
SHT_1 DIV_5 36K sample/s
SHT_2 DIV_5 24K sample/s
SHT_3 DIV_5 18K sample/s
SHT_4 DIV_5 14K sample/s
SHT_5 DIV_5 12K sample/s
SHT_6 DIV_5 10K sample/s
SHT_7 DIV_5 9K sample/s
SHT_0 DIV_6 56K sample/s
SHT_1 DIV_6 28K sample/s
SHT_2 DIV_6 18K sample/s
SHT_3 DIV_6 14K sample/s
SHT_4 DIV_6 11K sample/s
SHT_5 DIV_6 9K sample/s
SHT_6 DIV_6 8K sample/s
SHT_7 DIV_6 7K sample/s
SHT_0 DIV_7 39K sample/s
SHT_1 DIV_7 19K sample/s
SHT_2 DIV_7 12K sample/s
SHT_3 DIV_7 9K sample/s
SHT_4 DIV_7 7K sample/s
SHT_5 DIV_7 6K sample/s
SHT_6 DIV_7 5K sample/s
SHT_7 DIV_7 4K sample/s
SHT_0 DIV_8 29K sample/s
SHT_1 DIV_8 14K sample/s
SHT_2 DIV_8 9K sample/s
SHT_3 DIV_8 7K sample/s
SHT_4 DIV_8 5K sample/s
SHT_5 DIV_8 4K sample/s
SHT_6 DIV_8 4K sample/s
SHT_7 DIV_8 3K sample/s


很奇怪这一行
while(timer < t0 + 1000)
如果改成这样的写法
while(timer - 1000 < t0)
程序就不能正常执行了，像死机了一样。我没有jtag调试器，不知道究竟是什么原因
难道是当timer = 0的时候做减法会溢出，导致了cpu异常？

还有就是sprintf格式化long 32位整数
我的写法是
sprintf(buf,"%ld",ad);
貌似不能正常格式化，是因为ccs的c库的实现有问题吧？