tms470r1a256_adc10_01.c

来自「TI TMS470 series mcu demo code」· C语言 代码 · 共 52 行

//******************************************************************************
//  TMS470 Demo - MibADC Sample ADIN0, Set HET0 if > 0.5*AVcc
//
//  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.
//  If A0 > 0.5*AVcc, HET0 set, else reset.
//
//  ACLK = SYSCLK = MCLK = ICLK = 12MHz
//  //*An external 12Mhz XTAL on OSCIN OSCOUT with proper load caps required*//	
//
//              TMS-FET470A256
//             -----------------
//         /|\|            OSCIN|-
//          | |                 | 12MHz
//          --|PLLDIS     OSCOUT|-
//            |                 |
//        >---|ADIN0        HET0|---> LED
//            |                 |
//
//  M.Buccini/J.Mangino
//  Texas Instruments, Inc
//  January 2005
//  Built with IAR Embedded Workbench Version: 4.20A
//******************************************************************************

#include <intrinsic.h>
#include "iotms470r1a256.h"
#include "tms470r1a256_bit_definitions.h"

void main(void)
{
  PCR = CLKDIV_1;                         // ICLK = SYSCLK
  PCR |= PENABLE;                         // enable peripherals

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

  ADCR1 |= ACQ_128 + PS_8;                // ACQ 128, prescaler = 8
  ADCR1 |= ADC_EN;                        // Enable ADC

  for (;;)
  {
    ADISR1 = 0x0001;                      // Convert croup 1 = channel 0
    while (!(ADSR & GP1_END));            // Wait for conversion to complete
    if (ADDR0 < 0x1FF)                    // Reading clears flag
      HETDOUT &= ~0x01;
    else
      HETDOUT |= 0x01;
  }
}