ML51 ADC采集问题通道P2.0

只看该作者 · 2020-5-8 10:00

本帖最后由 weishengdianqi 于 2020-5-8 10:02 编辑

大家好，ADC P2.0对地短接就变成0，其它时间ADC采集到的ADC值一直是2048，我是用官网提供的历程
/*---------------------------------------------------------------------------------------------------------*/
/*                                                                                                       */
/* Copyright(c) 2019 Nuvoton Technology Corp. All rights reserved.                                        */
/*                                                                                                       */
/*---------------------------------------------------------------------------------------------------------*/

//***********************************************************************************************************
//  Website: http://www.nuvoton.com
//  E-Mail : MicroC-8bit@nuvoton.com
//***********************************************************************************************************

//***********************************************************************************************************
//  File Function: ML51 series ADC software trigger on shot demo code
//***********************************************************************************************************
#include "ML51.h"
unsigned int ADCRESULT;
/******************************************************************************
* FUNCTION_PURPOSE: ADC interrupt Service Routine
******************************************************************************/
void ADC_ISR (void) interrupt 11
{
clr_ADCCON0_ADCF;                            //clear ADC interrupt flag
            printf ("ADCRH = 0x%BX  ",ADCRH);                                                 //include uart.c before use printf function.
            printf ("ADCRL = 0x%BX \n ",ADCRL);                                              //include uart.c before use printf function.
}

/******************************************************************************
The main C function.  Program execution starts
here after stack initialization.
******************************************************************************/
void main ()
{
/*
For UART0 P0.5 TXD output setting
* include gipo.c in Library for GPIO mode setting
* include uart.c in Library Setting for UART0
*/
            MFP_P31_UART0_TXD;                                                                                                                      // UART0 TXD use P0.5
            P31_QUASI_MODE;                                                                         // set P0.5  as Quasi mode for UART0 trasnfer
            UART_Open(24000000,UART0_Timer3,115200);                               // Open UART0 use timer1 as baudrate generate and baud rate = 115200
            ENABLE_UART0_PRINTF;
/*
      ADCS to trig ADC convert
      * include adc.c in Library for ADC initial setting
*/
            ADC_Open(ADC_SINGLE,5);                                                                                                                                                             //Enable ADC_CH4
            ADC_ConvertTime(2,7);
            ADC_Interrupt(Enable,ADC_INT_SINGLE);                                                                                                       //Enable ADC interrupt
            ENABLE_GLOBAL_INTERRUPT;                                                                                                                                                 // Enable global interrupt
/* find ADC result in ADC interrupt*/

            while(1)
            {
                              set_ADCCON0_ADCS;                                           // Software trig adc start
                              Timer0_Delay(24000000,100,1000);
                     ADCRESULT = (ADCRH<<4)+ADCRL;
            }

}//ADCRESULT这个值一直是2048