[GD32F150R8]02、与Labview 之VISA 串口通信2

sky-Hawk where · 发表于 2015-7-17 21:01:47

回顾一下上一篇
GD32 F150R8 与 PC端LabView 通信之VISA串口通信
https://www.cirmall.com/bbs/forum.php?mod=viewthread&tid=42739&fromuid=23447

简单的实现GD32F150R8 与Labview 之间的通讯，代码如下
switch (cGetChar)
{.......................
}
cGetChar 大小决定任务的复杂性与扩展性。这里意味着最多有且仅有128种的扩展，并且也不利于数据通信。并且在可读性上很差在日后维护性上带来很大的不足。

采用command line 进行扩展。其实很简单，只不过是性字符串的比较
利于命令"set led %d\r\n"，却对led显示的模式进行设置
但串口接收到\r\n时，对command 进行分析，并且与GD32F150R8中注册的command进行寻找配对
当找到时，调用其对应的函数，进行解析。而main函数就变得很简单
关键代码如下：

int main(void)
{
//int i;
  char cGetChar;
EVB_LEDConfig();
EVB_Uart2Config();

  PRINTF("\r\nLabview & GD32F150\r\n");

  while(1)
  {
run_cmd();
  }
}

char *
get_line (char *line)
{
int pos;
int ch;

pos = 0;
ch = (int)uif_in_char();
while ( (ch != 0x0D /* CR */) &&
         (ch != 0x0A /* LF/NL */) &&
         (pos < UIF_MAX_LINE))
{
      switch (ch)
      {
         case 0x08:    /* Backspace */
         case 0x7F:    /* Delete */
            if (pos > 0)
            {
                  pos -= 1;
                  uif_out_char(0x08); /* backspace */
                  uif_out_char(' ');
                  uif_out_char(0x08); /* backspace */
            }
            break;
         default:
            if ((pos+1) < UIF_MAX_LINE)
            {
                  if ((ch > 0x1f) && (ch < 0x80))
                  {
                     line[pos++] = (char)ch;
                     uif_out_char((char)ch);
                  }
            }
            break;
      }
      ch = (int)uif_in_char();
}
line[pos] = '\0';
uif_out_char(0x0D); /* CR \r 回车*/
uif_out_char(0x0A); /* LF \n 换行*/

return line;
}

void
run_cmd (void)
{
/*
   * Global array of pointers to emulate C argc,argv interface
   */
int argc;
char *argv[UIF_MAX_ARGS + 1]; /* one extra for null terminator */

get_line(cmdline1);

  argc = make_argv(cmdline1,argv);
//if (!(argc = make_argv(cmdline1,argv)))
  if( argc==0 )
{
      /* no command entered, just a blank line */
      strcpy(cmdline1,cmdline2);
      argc = make_argv(cmdline1,argv);
}
cmdline2[0] = '\0';

if (argc)
{
      int i;
      for (i = 0; i < UIF_NUM_CMD; i++)
      {
         if (strcasecmp(UIF_CMDTAB.cmd,argv[0]) == 0)
         {
            if (((argc-1) >= UIF_CMDTAB.min_args) &&
                  ((argc-1) <= UIF_CMDTAB.max_args))
            {
                  if (UIF_CMDTAB.flags & UIF_CMD_FLAG_REPEAT)
                  {
                     strcpy(cmdline2,argv[0]);
                  }
                  UIF_CMDTAB.func(argc,argv);
                  return;
            }
            else
            {
                  uif_printf(SYNTAX,argv[0]);
                  return;
            }
         }
      }
      uif_printf(INVCMD,argv[0]);
      uif_printf(HELPMSG);
}
}

以后的扩展都在UIF_SETCMD UIF_SETCMDTAB[]={
{"led",0,1,uif_cmd_led,"set led"}
};
进行不断的扩展，就能实现很复杂的响应

void
uif_cmd_led (int argc, char **argv)
{
int success = false;
uint32 data =0;
(void)argc;
(void)argv;

data = get_value(argv[2],&success,10);

switch (data)
{
  case 0:
EVB_LEDControl(LED1, LED_OFF);
EVB_LEDControl(LED2, LED_OFF);
break;
  case 1:
EVB_LEDControl(LED1, LED_ON);
EVB_LEDControl(LED2, LED_OFF);
break;
  case 2:
EVB_LEDControl(LED1, LED_OFF);
EVB_LEDControl(LED2, LED_ON);
break;
  case 3:
EVB_LEDControl(LED1, LED_ON);
EVB_LEDControl(LED2, LED_ON);
break;

  default:
break;
}
}

UIF_SETCMD UIF_SETCMDTAB[]={
{"led",0,1,uif_cmd_led,"set led"}
};
const int UIF_NUM_SETCMD = UIF_SETCMDTAB_SIZE;

Labview 程序

Labview程序

Simple Serial.rar (24.04 KB, 下载次数: 10)

sky-Hawk where · 发表于 2015-7-19 07:31:23

谢谢分享

sky-Hawk where · 发表于 2015-7-20 08:37:53

谢谢分享

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