Question

我是3B +树莓派（树莓派os）模型的新手，我正在尝试使用hzller库

在led矩阵上显示在UART端口接收的文本。

我在led矩阵上显示文本，但是我不知道如何将给定的示例代码与串行通信代码（wiringPi）集成在一起，但是会出现一些错误。如何将两个代码合而为一。

我已经从rpi-rgb-led-matrix库编辑了text-example.cc代码，如下所示

 // -*- mode: c++; c-basic-offset: 2; indent-tabs-mode:nil; -*-
 // Small example how write text. 
 //
 // This code is public domain
 // (but note, that the led-matrix library this depends on is GPL v2)

 #include "led-matrix.h" 
 #include "graphics.h"

 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <math.h>
 #include <canvas.h>


 using namespace rgb_matrix;

 using rgb_matrix::GPIO;
 using rgb_matrix::RGBMatrix;
 using rgb_matrix::Canvas;


  using rgb_matrix::GPIO;
  using rgb_matrix::RGBMatrix;
  using rgb_matrix::Canvas;

  static void DrawOnCanvas(Canvas *canvas) {
  /*
  * Let's create a simple animation. We use the canvas to draw
  * pixels. We wait between each step to have a slower animation.
  */
  canvas->Fill(0, 0, 255);

  int center_x = canvas->width() / 2;
  int center_y = canvas->height() / 2;
  float radius_max = canvas->width() / 2;
  float angle_step = 1.0 / 360;
  for (float a = 0, r = 0; r < radius_max; a += angle_step, r += angle_step) 
  {
  float dot_x = cos(a * 2 * M_PI) * r;
  float dot_y = sin(a * 2 * M_PI) * r;
  //canvas->SetPixel(center_x + dot_x, center_y + dot_y,255, 45, 0);
  usleep(1 * 100000);  // wait a little to slow down things.
  }
  }

  int main(int argc, char *argv[]) {
  /*
  * Set up GPIO pins. This fails when not running as root.
  */
  GPIO io;
  if (!io.Init())
  return 1;

  /*
  * Set up the RGBMatrix. It implements a 'Canvas' interface.
  */
  int rows = 32;    // A 32x32 display. Use 16 when this is a 16x32 display.
   int chain =20;    // Number of boards chained together.
   int parallel = 1; // Number of chains in parallel (1..3). > 1 for plus or 
   Pi2
  Canvas *canvas = new RGBMatrix(&io, rows, chain, parallel);
  //canvas->SetPixel(6, 0,255, 255, 45);
  DrawOnCanvas(canvas);    // Using the canvas.

  // Animation finished. Shut down the RGB matrix.
  // canvas->Clear();
  delete canvas;

  return 0;
  }

connectionPi用于读取接收到的数据的示例代码如下

    /*
   UART communication on Raspberry Pi using C (WiringPi Library)
   http://www.electronicwings.com
  */

  #include <stdio.h>
  #include <string.h>
  #include <errno.h>

  #include <wiringPi.h>
  #include <wiringSerial.h>

  int main ()
    {
   int serial_port ;
   char dat;
   if ((serial_port = serialOpen ("/dev/ttyS0", 9600)) < 0) /* open serial 
   port */
   {
   fprintf (stderr, "Unable to open serial device: %s\n", strerror (errno)) ;
   return 1 ;
   }

   if (wiringPiSetup () == -1)                  /* initializes wiringPi setup 
   */
   {
   fprintf (stdout, "Unable to start wiringPi: %s\n", strerror (errno)) ;
   return 1 ;
   }

   while(1){

   if(serialDataAvail (serial_port) )
    { 
    dat = serialGetchar (serial_port);      /* receive character serially*/ 
    printf ("%c", dat) ;
    fflush (stdout) ;
    serialPutchar(serial_port, dat);        /* transmit character serially on 
     port */
        }
     }

     }

有什么方法可以将这两个示例代码合而为一

如何将WireingPi库与rpi-rgb-led-matrix库结合使用

0 个答案: