fet430_oa1_ni-pga.c

msp430开发c语言例程

//******************************************************************************
//   MSP-FET430P430 Demo - OA1 Configured For Non-Inverting PGA Mode
//
//   Description; Configure OA1 of the MSP430FG439 for Non-Inverting PGA mode.
//   In this mode, the - terminal is connected to the R ladder tap and the
//   OAFBRx bits select the gain.
//   //* MSP430FG439 Device Required*//
// 
//                MSP430FG439   
//             -------------------
//         /|\|                XIN|-  
//          | |                   |
//          --|RST            XOUT|-
//            |                   |
//            |      P6.4/A4/OA1I0|<-  Input
//            |       P6.3/A3/OA1O|->  OA1 Amplified Output
//            |                   |
//
//   M.Mitchell
//   Texas Instruments, Inc
//   April 2004
//   Built with IAR Embedded Workbench Version: 2.21B
//******************************************************************************
#include  <msp430xG43x.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop watchdog timer
  
  OA1CTL0 = OAPM_1 + OAADC1;            // Select inputs, power mode
  OA1CTL1 = OAFC_4 + OAFBR_6 + OARRIP;  // Mode, OAFBRx sets gain
  
  LPM3;                                 // LPM3;
}