tms470r1b1m_adc10_05.c

TMS470的ＡＤＣ总线源码

//******************************************************************************
//  TMS470 Demo - MibADC Sample ADIN0-1 Continuous 32KSPS
//
//  Description; A single sample is made continuously ADIN0-1 with reference to
//  AVcc/AVss.  Software sets starts sample and conversion and polls
//  for end of conversion.  Set breakpoint to read ADDRO and ADDR1 values
//
//  Total sample and convert time = 19.6608 MHz/(8*((62+2)+11)) = 32.7KSPS
//  SYSCLK = MCLK = ACLK = 8 x 7.3728MHz = 58.9824MHz
//  ICLK = SYSCLK / 3 = 19.6608MHz
//
//  //*An external 7.3728MHz XTAL with proper load caps is required*//
//
//              TMS-FET470B1M
//             -----------------
//            |            OSCIN|-
//         +--|PLLDIS           | 7.3728MHz
//         |  |           OSCOUT|-
//        -+- |                 |
//            |                 |
//        >---|ADIN0            |
//        >---|ADIN1            |
//
//  L.Westlund / J.Mangino
//  Texas Instruments, Inc
//  July 29th 2005
//  Built with IAR Embedded Workbench Version: 4.30A
//******************************************************************************

#include <intrinsic.h>
#include "iotms470r1b1m.h"
#include "tms470r1b1m_bit_definitions.h"

void LedSet(unsigned int mask);

void main(void)
{
  PCR = CLKDIV_3;                         // ICLK = SYSCLK / 3
  GCR = ZPLL_CLK_DIV_PRE_1;               // SYSCLK = 8 x fOSC
  PCR |= PENABLE;                         // Enable peripherals

  HETDIR  = 0xFFFFFFFF;                   // HETx Output direction
  HETDOUT = 0x00000000;

  ADCR1 |= PS_8;                          // ADCLK prescaler = 8
  ADSAMPEV |= SEN;                        // ADCSAMP1 controls SW
  ADSAMP1 = 62;                           // SW = 62+2

  ADCR1 |= ADC_EN;                        // Enable ADC
  ADISR1 = 0x0003;                        // group 1 = channel 0, 1
  ADCR2 |= G1_MODE;                       // Continuous Conversion

  // Loop forever.
  for (;;)
  {
    while (!(ADSR & GP1_END));            // Wait for conversion to complete
    ADSR |= GP1_END;                      // Clears flag
    __no_operation();                     // SET BREAKPOINT HERE TO READ ADDR0 and ADDR1
  }
}