PIC16F877使用MPLAB用C语言在LED上显示ADC的结果
我使用 PIC16F877，目的是选择通道 4 在 PortD LED 上显示模拟输入 AN4 值。近似值约为1V。我写了一个代码，但是无论我如何运行我的代码，GPIO 监视器都没有反应。 顺便问一下，我是否在 while(1){} 循环中编写 ReadADC1() ？我尝试过，但没有任何帮助。谢谢。
#include <xc.h>
#define LEDs PORTD
#include "prologue.c"
unsigned char ReadADC1(void) {
ADCON0 |= 0b00000010;
while ( (ADCON0 & 0b00000010) );
return ADRESH;
}
main ()
{
// declare variables if any required
TRISA= 0B00100000;
ANSEL=0B00010000;
ADCON0 = 0b11010001;
ADCON1 = 0b10000000;
LEDs=ReadADC1();
//*** your code for initialisation if required
//*** end of your initialisation
//*** your code for the superloop
while (1) {
}
//*** end of the superloop
}
GPIO 引脚监视器没有反应。我多次重启IDE。
I used PIC16F877 and my purpose is to choose CHANNEL 4 to display the analogue input AN4 value on PortD leds. The approximate value is about 1V. I wrote a code and however, no matter how I ran my code, there're not reaction with the GPIO monitor.
By the way, do I write ReadADC1() in the while(1){} loop? I tried that, but there's no help. Thanks.
#include <xc.h>
#define LEDs PORTD
#include "prologue.c"
unsigned char ReadADC1(void) {
ADCON0 |= 0b00000010;
while ( (ADCON0 & 0b00000010) );
return ADRESH;
}
main ()
{
// declare variables if any required
TRISA= 0B00100000;
ANSEL=0B00010000;
ADCON0 = 0b11010001;
ADCON1 = 0b10000000;
LEDs=ReadADC1();
//*** your code for initialisation if required
//*** end of your initialisation
//*** your code for the superloop
while (1) {
}
//*** end of the superloop
}
There's no reaction with the GPIO pins monitor. I restarted the IDE many times.
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默认情况下，所有端口都配置为输入。如果您想使用端口作为输出，则必须更改配置：
另一个问题：
该控制器中没有 ANSEL 寄存器，您必须使用 ADCON1 寄存器进行选择（数字或模拟输入）。
By default all ports are configured as an input. If you want want use a port as an output you had to change the configuration:
Another issue:
There is no
ANSELregister in this controller, you had to do the selection (digital or analog input) withADCON1register.