tms470r1b1m_adc10_08.c

TMS470的ＡＤＣ总线源码

//******************************************************************************
//  TMS470 Demo - MibADC Sample ADIN0 single conversion
//
//  Description; A single sample is made on ADIN0 with reference to AVcc/AVss.
//  Software sets starts sample and conversion and polls for end of conversion.
//
//  Total sample and convert time = 1sec / (19.66MHz/(8*((62+2)+11))) = 30.5uSec
//  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         HET|---> Toggle
//            |                 |
//
//  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 main(void)
{

  PCR = CLKDIV_3;                         // ICLK = SYSCLK / 3
  GCR = ZPLL_CLK_DIV_PRE_1;               // SYSCLK = 8 x fOSC
  PCR |= PENABLE;                         // Enable peripherals

  ADCR1 |= PS_8;                          // ADCLK prescaler = 8
  ADSAMPEV |= SEN;                        // ADCSAMP1 controls SW
  ADSAMP1 = 62;                           // SW = 62+2
  ADCR1 |= ADC_EN;                        // Enable ADC
  ADISR1 = 0x0001;                        // Convert croup 1 = channel 0

  while (!(ADSR & GP1_END));              // Wait for conversion to complete
  ADSR |= GP1_END;                        // Clears flag
  __no_operation();                       // SET BREAKPOINT HERE TO READ ADDR0

}