使用板载BeagleBone黑色LED的4位十进制到二进制转换器

4-bit Decimal to Binary Converter using on-board BeagleBone Black LEDs

本文关键字：十进制 4位 二进制 转换器 LED 板载 BeagleBone 黑色      更新时间：2023-10-16

我正试图编写一个c++程序，将1到15之间的数字转换为二进制，并通过板载BeagleBone Black LED显示输出。

#include<iostream>
#include<stdio.h>
#include<unistd.h>
using namespace std;
int main(){
FILE *BINHandle = NULL;
const char *LED0="/sys/class/leds/beaglebone:green:usr0/brightness";
const char *LED1="/sys/class/leds/beaglebone:green:usr1/brightness";
const char *LED2="/sys/class/leds/beaglebone:green:usr2/brightness";
const char *LED3="/sys/class/leds/beaglebone:green:usr3/bringtness";
int a, b, c;
cout << "Enter an number between 1 and 15" << endl;
cin >> a;
cout << a << " in binary is:" << endl;
for(b = 3; b >=0; b--){
c = a >> b;
if(c & 1){
if(b = 3){
BINHandle = fopen(LED3, "r+");
fwrite("1", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
else{
BINHandle = fopen(LED3, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
if(b = 2){
BINHandle = fopen(LED2, "r+");
fwrite("1", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
else{
BINHandle = fopen(LED2, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
if(b = 1){
BINHandle = fopen(LED1, "r+");
fwrite("1", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
else{
BINHandle = fopen(LED1, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
if(b = 0){
BINHandle = fopen(LED0, "r+");
fwrite("1", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
else{
BINHandle = fopen(LED0, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
}
}
}
usleep(2000000);

BINHandle = fopen(LED0, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
BINHandle = fopen(LED1, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
BINHandle = fopen(LED2, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);
BINHandle = fopen(LED3, "r+");
fwrite("0", sizeof(char), 1, BINHandle);
fclose(BINHandle);

}

现在，每当该位为1时，我都会尝试单独访问LED。我没有得到错误，但当我运行代码并输入数字时，当我应该得到输出时，我会得到"Segmentation fault"

const char *LED0="/sys/class/leds/beaglebone:green:usr0/brightness";
const char *LED1="/sys/class/leds/beaglebone:green:usr1/brightness";
const char *LED2="/sys/class/leds/beaglebone:green:usr2/brightness";
const char *LED3="/sys/class/leds/beaglebone:green:usr3/bringtness";
const char *BIN = (LED3<<3)+(LED2<<2)+(LED1<<1)+LED0;

你不能那样把绳子连在一起。

如果你想从多个文件中读取或写入多个文件，你需要打开每个文件并分别读取/写入。

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