fet120_adc10_15.c

一个基于TI的MSP430的程序设计参考代码

//******************************************************************************
//  MSP-FET430P120 Demo - ADC10/DTC Sample A10 32x Directly to Flash, DCO 
//
//  Description; Use DTC to sample A10 32x, reference to AVcc, and transfer 
//  code directly to Flash. Software writes to ADC10SC to trigger sample
//  burst. Timing for Flash programming is important and must meet the device
//  f(FTG) datasheet specification ~ (257kHz)/35 - (476kHz)/35
//  Assume default DCO = SMCLK ~ 800kHz.
//  As programmed; 
//  Each ADC10 sample & convert = (SMCLK)/(64+13) = SMCLK/77 = 96us
//  Flash write per word = (SMCLK/2)/35 = SMCLK/70 = 88us
//  Enough time is provided between ADC10 conversions for each word moved by 
//  the DTC to Flash to program. DTC transfers ADC10 code to Flash 1080h-10BEh. 
//  In the Mainloop, MSP430 waits in LPM0 durring conversion and programming, 
//  ADC10_ISR(DTC) will force exit from any LPMx in Mainloop on reti. 
//  //* MSP430F12x2 or MSP430F11x2 Device Required *//
//
//               MSP430F1232
//            -----------------
//        /|\|              XIN|-  
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//           |A10              |
//
//  M.Buccini
//  Texas Instruments, Inc
//  February 2004
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  <msp430x12x2.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  ADC10CTL1 = INCH_10 + ADC10SSEL_3 + CONSEQ_2;        
  ADC10CTL0 = SREF_1 + ADC10SHT_3 + MSC + REFON + ADC10ON + ADC10IE; 
  ADC10DTC1 = 0x20;                     // 32 conversions   
  FCTL2 = FWKEY + FSSEL_2 + FN0;        // SMCLK/2

  for (;;)                              
  {
   FCTL3 = FWKEY;                       // Lock = 0
   FCTL1 = FWKEY+ERASE;                 // Erase bit = 1
   *(unsigned int *)0x1080 = 0;         // Dummy write to erase Flash segment

    ADC10CTL0 &= ~ENC;                   
    while (ADC10CTL1 & BUSY);           // Wait if ADC10 core is active
    ADC10SA = 0x1080;                   // Data buffer start
    ADC10CTL0 |= ENC + ADC10SC;         // Sampling and conversion ready

    FCTL1 = FWKEY + WRT;                // Write bit = 1
    ADC10CTL0 |= ENC + ADC10SC;         // Start sampling
    _BIS_SR(CPUOFF + GIE);              // LPM0, ADC10_ISR will force exit
    FCTL3 = FWKEY + LOCK;               // Lock = 1
    _NOP();                             // << SET BREAKPOINT HERE
  }
}


// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
    _BIC_SR_IRQ(CPUOFF);                // Clear CPUOFF bit from 0(SR)
}