【玄铁杯第三届RISC-V应用创新大赛】GPIOD库驱动LED灯

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【玄铁杯第三届RISC-V应用创新大赛】GPIOD库驱动LED灯 [复制链接]

 

这篇测试下开发板使用GPIOD库驱动GPIO，使用LED指示灯显示GPIO状态。

 

一、安装部署GPIO库

 

按照官网的教程，安装部署GPIOD库

sudo apt install wget
wget https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/snapshot/libgpiod-2.0.tar.gz

tar zxvf libgpiod-2.0.tar.gz

cd libgpiod-2.0
sudo apt-get install build-essential pkg-config m4 automake autoconf libtool autoconf-archive
sudo apt install gcc g++

export CC=gcc
export CXX=g++

#部署库的相关文件到项目文件夹：--prefix后面的路径要换成自己项目所在的路径，方便后续操作
./autogen.sh --enable-tools=yes --prefix=/home/sipeed/mylib_local
make
sudo make install

 

二、硬件部分

 

2.1、底板原理图GPIO部分

 

2.2、官方文档GPIO部分

 

官网文档和原理图上的标号不一致，官网提示以文档的标注为准。

 

2.3、接口转接

使用设计的转接板 https://bbs.eeworld.com.cn/thread-1259074-1-1.html

 

三、测试代码

 

gpio.c

//#gpio.c

#include<stdio.h>
#include<unistd.h>
#include<gpiod.h>

#define PIN_IO1_3   3
#define PIN_IO1_4   4
#define PIN_IO1_5   5
#define PIN_IO1_6   6

int main() 
{
  struct gpiod_chip *gchip;
  struct gpiod_line_info *glinein, *glineout;
  struct gpiod_line_settings *gline_settings_in, *gline_settings_out;
  struct gpiod_line_config   *gline_config_in, *gline_config_out;
  struct gpiod_request_config *gline_request_config_in, *gline_request_config_out;
  struct gpiod_line_request   *gline_request_in, *gline_request_out;
  int offset_in[1] = {PIN_IO1_5};
  int offset_out[3] = {PIN_IO1_3, PIN_IO1_4, PIN_IO1_6};
  int value;

  if ((gchip=gpiod_chip_open("/dev/gpiochip1")) == NULL) 
  {
    perror("gpiod_chip_open");
    return 1;
  }


  gline_settings_in = gpiod_line_settings_new();
  if ((value=gpiod_line_settings_set_direction(gline_settings_in, GPIOD_LINE_DIRECTION_INPUT)) != 0) 
  {
    perror("gpiod_line_settings_set_direction");
  }

  gline_config_in = gpiod_line_config_new();
  value=gpiod_line_config_add_line_settings(gline_config_in, offset_in, 1, gline_settings_in);
  gline_request_config_in = gpiod_request_config_new();
  gline_request_in = gpiod_chip_request_lines(gchip, gline_request_config_in, gline_config_in);
  
  gline_settings_out = gpiod_line_settings_new();
  if (gpiod_line_settings_set_direction(gline_settings_out, GPIOD_LINE_DIRECTION_OUTPUT) != 0) 
  {
    perror("gpiod_line_settings_set_direction");
  }
  gline_config_out = gpiod_line_config_new();
  gpiod_line_config_add_line_settings(gline_config_out, offset_out, 3, gline_settings_out);
  gline_request_config_out = gpiod_request_config_new();
  gline_request_out = gpiod_chip_request_lines(gchip, gline_request_config_out, gline_config_out);

  value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_3, 0);
  value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_4, 1);
  value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_6, 0);

  //printf("IO1-3 = 1, IO1-4 = 0\n");
  sleep(1);

  for (int i = 0; i < 10; i++) {

      value=gpiod_line_request_get_value(gline_request_in, PIN_IO1_5);
      printf("IO1-5 = %d\n", value);
      value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_3, 1);
      value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_4, 0);
      value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_6, 1);
      sleep(1);
      value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_3, 0);
      value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_4, 1);
      value=gpiod_line_request_set_value(gline_request_out, PIN_IO1_6, 0);
      sleep(1);
  }

  gpiod_chip_close(gchip);
  return 0;
}

 

四、编译运行

 

4.1、编译代码

编译之前运行下面命令

export LD_LIBRARY_PATH=/home/sipeed/mylib_local/lib:$LD_LIBRARY_PATH
export PATH=/home/sipeed/mylib_local/bin:$PATH
sudo chmod o+rw /dev/gpiochip4
sudo chmod o+rw /dev/spidev2.0

执行编译命令

gcc  -I/home/sipeed/mylib_local/include -L/home/sipeed/mylib_local/lib -o gpio gpio.c -lgpiod

运行程序

./gpio

 

4.2、程序运行

运行视频如下：

gpiod