菜鸟PIC16按键LED不亮，求解 (amobbs.com 阿莫电子技术论坛) -

wang479871 发表于 2014-3-1 19:40:51

菜鸟PIC16按键LED不亮，求解

本帖最后由 wang479871 于 2014-3-1 19:42 编辑

//我想通过PIC16F883单片机的RA1管脚按键输入，RB6管脚接LED做指示灯
//我已经用万用表测了RA1管脚信号电压不管是0V还是5V，RB6LED都不亮，如果PORTB=0xFF，则LED亮
//编译环境为 MPLAB IDEv8.7，编译器用HI-TECH C，下面这是单片机配置位

#include <pic.h>
#define uchar unsigned char
#define uintunsigned int

void Port_Init()
{
TRISA |= 0x02; //RA1管脚配置输入
TRISB &= ~0x40; //RB6管脚配置输出
INTCON = 0x00; //关闭所有中断
}

void main()
{
Port_Init();
while(1)
{
if(PORTA & 0x02)
PORTB |= 0x40;
else
PORTB &= ~0x40;
}
}

//请教LED不亮的原因是程序不对，还是配置位不对，

wang479871 发表于 2014-3-1 19:48:06

之前接触过些其它单片机，一直对PIC单片机很敬仰没有时间入手，我写过些简单的PIC18F4620程序，PIC16单片机光是编译器都画了好长时间从下载到安装再到编译通过，网上也搜了好多示例程序，要么编译出错，要么就是编译下载后不对

sfq2008 发表于 2014-3-1 20:01:08

多看手册,设置OSCCON

wavelee123 发表于 2014-3-1 22:39:51

你没有把I/O脚设置为数字口，PIC单片机引脚有模拟功能，商店默认是模拟口

wang479871 发表于 2014-3-1 23:01:48

本帖最后由 wang479871 于 2014-3-1 23:04 编辑

wavelee123 发表于 2014-3-1 22:39
你没有把I/O脚设置为数字口，PIC单片机引脚有模拟功能，商店默认是模拟口

真是太感谢你了，我加了个ANSEL &= ~0x02;就可以了。
我仔细看了下手册配置IO端口

之前接触其它单片机的时候，由于时间比较充裕，我都是先看芯片手册后，才开始写程序的，
现在倒过来，先在网上找些示例程序，从点亮LED开始，这样虽然进度会快些，但是一旦碰到问题，就会卡半天....

huangxiaowei 发表于 2014-4-16 14:59:20

顶一下

xuanfong1 发表于 2014-4-22 18:53:19

瞧一瞧看一看

xuanfong1 发表于 2014-4-28 11:23:33

路过路过顺便看看

pen245760036 发表于 2014-5-4 16:42:16

{:lol:} ANSEL 寄存器专坑PIC刚入门新手

tlsmf 发表于 2014-5-6 14:46:33

ANSEL

kwen 发表于 2014-12-27 16:42:41

受教了。{:lol:}原来如此

sun_changdong 发表于 2014-12-30 15:35:27

很容易忽略的问题！

lzandyc 发表于 2017-2-10 08:40:15

wang479871 发表于 2014-3-1 23:01
真是太感谢你了，我加了个ANSEL &= ~0x02;就可以了。
我仔细看了下手册配置IO端口

楼主，以下我根据你的代码改的，根据RC2的电平来控制RC0的电平，可是实际上测试RC0一直都是低电平，我还有什么问题吗？查了2天资料都没有发现

#include <htc.h>
//__CONFIG(FOSC_ECL&WDTE_OFF);
__CONFIG(0x3fe4);
//内部晶振，禁止看门狗

void init_gpio()
{
TRISA0=1; //ICSPDAT
TRISA1=1; //ICSPCLK
TRISA2=1; //DIMINT
TRISA3=1; //VPP
TRISA4=1; //DIMSAMP
TRISA5=1; //NC

SDOSEL = 1;
ANSELC |= 0X04;
TRISC = 0X04;

INTCON = 0x00; //关闭所有中断
}

main()
{
OSCCON=0B01101011; //fosc=4Mhz; internal osc;
WDTCON = 0;

init_gpio();

while(1)
{
if(PORTC & 0X04)
PORTC |= 0X01;
else
PORTC &= ~0X01;
}
}

石进良 发表于 2017-3-16 14:53:10

// PIC18F25K80 Configuration Bit Settings

// 'C' source line config statements

#include <xc.h>

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

// CONFIG1L
#pragma config RETEN = OFF    // VREG Sleep Enable bit (Ultra low-power regulator is Disabled (Controlled by REGSLP bit))
#pragma config INTOSCSEL = HIGH // LF-INTOSC Low-power Enable bit (LF-INTOSC in High-power mode during Sleep)
#pragma config SOSCSEL = DIG // SOSC Power Selection and mode Configuration bits (Digital (SCLKI) mode)
#pragma config XINST = OFF    // Extended Instruction Set (Disabled)

// CONFIG1H
#pragma config FOSC = EC2 // Oscillator (Internal RC oscillator, CLKOUT function on OSC2)
#pragma config PLLCFG = OFF // PLL x4 Enable bit (Disabled)
#pragma config FCMEN = OFF    // Fail-Safe Clock Monitor (Disabled)
#pragma config IESO = OFF    // Internal External Oscillator Switch Over Mode (Disabled)

// CONFIG2L
#pragma config PWRTEN = OFF // Power Up Timer (Disabled)
#pragma config BOREN = OFF    // Brown Out Detect (Disabled in hardware, SBOREN disabled)
#pragma config BORV = 0       // Brown-out Reset Voltage bits (3.0V)
#pragma config BORPWR = ZPBORMV // BORMV Power level (ZPBORMV instead of BORMV is selected)

// CONFIG2H
#pragma config WDTEN = SWDTDIS// Watchdog Timer (WDT enabled in hardware; SWDTEN bit disabled)
#pragma config WDTPS = 1048576// Watchdog Postscaler (1:1048576)

// CONFIG3H
#pragma config CANMX = PORTB // ECAN Mux bit (ECAN TX and RX pins are located on RB2 and RB3, respectively)
#pragma config MSSPMSK = MSK7 // MSSP address masking (7 Bit address masking mode)
#pragma config MCLRE = ON    // Master Clear Enable (MCLR Enabled, RE3 Disabled)

// CONFIG4L
#pragma config STVREN = OFF // Stack Overflow Reset (Disabled)
#pragma config BBSIZ = BB1K // Boot Block Size (1K word Boot Block size)

// CONFIG5L
#pragma config CP0 = OFF    // Code Protect 00800-01FFF (Disabled)
#pragma config CP1 = OFF    // Code Protect 02000-03FFF (Disabled)
#pragma config CP2 = OFF    // Code Protect 04000-05FFF (Disabled)
#pragma config CP3 = OFF    // Code Protect 06000-07FFF (Disabled)

// CONFIG5H
#pragma config CPB = OFF    // Code Protect Boot (Disabled)
#pragma config CPD = OFF    // Data EE Read Protect (Disabled)

// CONFIG6L
#pragma config WRT0 = OFF    // Table Write Protect 00800-01FFF (Disabled)
#pragma config WRT1 = OFF    // Table Write Protect 02000-03FFF (Disabled)
#pragma config WRT2 = OFF    // Table Write Protect 04000-05FFF (Disabled)
#pragma config WRT3 = OFF    // Table Write Protect 06000-07FFF (Disabled)

// CONFIG6H
#pragma config WRTC = OFF    // Config. Write Protect (Disabled)
#pragma config WRTB = OFF    // Table Write Protect Boot (Disabled)
#pragma config WRTD = OFF    // Data EE Write Protect (Disabled)

// CONFIG7L
#pragma config EBTR0 = OFF    // Table Read Protect 00800-01FFF (Disabled)
#pragma config EBTR1 = OFF    // Table Read Protect 02000-03FFF (Disabled)
#pragma config EBTR2 = OFF    // Table Read Protect 04000-05FFF (Disabled)
#pragma config EBTR3 = OFF    // Table Read Protect 06000-07FFF (Disabled)

// CONFIG7H
#pragma config EBTRB = OFF    // Table Read Protect Boot (Disabled)

#define INT8Uunsigned char
#define _XTAL_FREQ 1000000UL

#define uchar unsigned char
#define uintunsigned int

void Port_Init()
{
   TRISA |= 0x02;    //RA1管脚配置输入
   TRISB &= ~0x40;    //RB6管脚配置输出
   INTCON = 0x00; //关闭所有中断
}

void main()
{
   Port_Init();
   while(1)
   {
            if(PORTA & 0x02)
                     PORTB |= 0x40;
            else
                     PORTB &= ~0x40;
   }
}

//请教LED不亮的原因是程序不对，还是配置位不对，

K7toubleaz 发表于 2017-3-16 23:40:07

關類比功能、設定輸入或輸出，做按鍵輸入的腳位要上拉，輸出電晶體的要串電阻，輸出LED的串電阻限流，我PIC大概IO口這樣設定就能工作了，給您參考。

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菜鸟PIC16按键LED不亮，求解