Question

我正在进行一个项目，我需要使用PIC12LF1552。我尝试运行的代码非常简单，包括读取RA5上的输入，然后设置RA2上的输出以点亮LED。问题是PIC似乎没有读取RA5上的输入。如果我将PIC编程为闪烁LED而不读取任何输入，则它可以正常工作用于编译的程序是MPLAB X 2.05，正在使用的程序员是Pickit3 我使用的代码是：

#include <xc.h>
#include "pic12lf1552.h"
#include <stdio.h>
#include <stdlib.h>
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

// CONFIG1
#pragma config FOSC = INTOSC    // Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin)
#pragma config WDTE = OFF       // Watchdog Timer Enable (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable (PWRT disabled)
#pragma config MCLRE = ON       // MCLR Pin Function Select (MCLR/VPP pin function is MCLR)
#pragma config CP = OFF         // Flash Program Memory Code Protection (Program memory code protection is disabled)
#pragma config BOREN = OFF      // Brown-out Reset Enable (Brown-out Reset disabled)
#pragma config CLKOUTEN = OFF   // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)

// CONFIG2
#pragma config WRT = OFF        // Flash Memory Self-Write Protection (Write protection off)
#pragma config STVREN = OFF     // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will not cause a Reset)
#pragma config BORV = LO        // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.)
#pragma config LPBOR = OFF      // Low-Power Brown Out Reset (Low-Power BOR is disabled)
#pragma config LVP = OFF        // Low-Voltage Programming Enable (High-voltage on MCLR/VPP must be used for programming)


#define LED PORTAbits.RA2
#define SWITCH PORTAbits.RA5

void MSDelay (unsigned int);

void main(void)
{
    //Set up I/O pins
    TRISAbits.TRISA2 = 0; //RA2 = LED output
    TRISAbits.TRISA5 = 1; //RA5 = switch
    ADCON1=0b00100;
 //    ADCON1 = ;
    //int b;
   // int i;



    if(SWITCH == 0)
    {
        LED=1;
        MSDelay(2000);
        LED=0;
    }
    else
    {
        LED=0;
        MSDelay(2000);
    }
    }



void MSDelay(unsigned int itime)
{
    unsigned int i;
    unsigned char j;
    for(i=0; i<itime;i++);
    for(j=0; j<165;j++);
}

Answer 1

根据数据表http://www.alldatasheet.com/datasheet-pdf/pdf/504825/MICROCHIP/PIC12LF1552.html，第93页关于ANSELA注册：

“ANSELA位默认为Analog 复位后的模式。使用任何引脚作为数字通用或外围设备输入，相应的ANSEL位必须由用户软件初始化为“0”。“

如果您不打算使用模拟输入，可以添加ANSELA=0;

之类的内容

目前，输出有效，因为：“ANSELA位的状态对数字没有影响输出功能。一个TRIS清零和ANSEL设置的引脚仍将作为数字输出运行，...... “

再见，

读取PIC12LF1552上的PIC输入

1 个答案: