分享讨论——MSP430AFE253的SD24采集程序调试

只看该作者 · 2016-7-15 16:55

如题，这个主要是介绍其最主要的24位的ad采集的程序的，我把程序的粘贴出来的，大家学习并加以讨论的啦，，

只看该作者 · 2016-7-15 16:58

这个单路差分信号的数据采集的，，
A SD24 interrupt occurs whenever a conversion has completed. Test by applying a voltage to channel 2 (A2.0+, A2.0-) and setting a breakpoint at the line indicated below.
Run program until it reaches the breakpoint, then use the debugger's watch window to view the conversion results. Conversion results are stored in the array, "results".
//  ACLK = n/a, MCLK = SMCLK = DCO =  ~ 1.1MHz
//  //* For Minimum Vcc required for SD24 module - see datasheet       *//
//  //* 100nF cap btw Vref and AVss is recommended when using 1.2V ref *//

只看该作者 · 2016-7-15 17:00

这个是硬件连接示意图的

//
//             MSP430AFE25x
//                -----------------
//          /|\|             XIN|-
//             | |                |
//             --|RST       XOUT|-
//          |                |
// Vin+ -->|A2.0+       |
//  Vin- -->|A2.0-       |
//          |                |
//          |       VREF |---+
//          |                | |
//          |                |  -+- 100nF
//          |                |  -+-
//          |                | |
//          |       AVss |---+
//          |                |

只看该作者 · 2016-7-15 17:00

好了，直接分享程序代码的了
#include <msp430afe253.h>

#define Num_of_Results 8

/* Arrays to store SD24 conversion results */
/* NOTE: arrays need to be global to    */
/*    prevent removal by compiler    */
unsigned int results[Num_of_Results];

void main(void)
{
  volatile unsigned int i;                // Use volatile to prevent removal
                                          // by compiler optimization

  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT

  SD24CTL = SD24REFON + SD24SSEL0;       // 1.2V ref, SMCLK
  SD24INCTL2 |= SD24INTDLY0;             // Interrupt on 3rd sample
  SD24CCTL2 |= SD24IE ;                   // Enable interrupt
  for (i = 0; i < 0x3600; i++);          // Delay for 1.2V ref startup

  SD24CCTL2 |= SD24SC;                   // Set bit to start conversion
  __bis_SR_register(LPM0_bits + GIE);    // Enter LPM0 w/ interrupts

}

#pragma vector=SD24_VECTOR
__interrupt void SD24AISR(void)
{
  static unsigned int index = 0;

  switch (SD24IV)
  {
case 2:                                  // SD24MEM Overflow
   break;
case 4:                                  // SD24MEM0 IFG
   break;
case 6:                                  // SD24MEM1 IFG
   break;
case 8:                                  // SD24MEM2 IFG
   results[index] = SD24MEM2;             // Save CH2 results (clears IFG)
   if (++index == Num_of_Results)
   {
      index = 0;                         // SET BREAKPOINT HERE
   }
   break;
  }
}