回复： Re: uart does not work
787562067
googcheng at qq.com
Wed Mar 27 01:19:01 UTC 2019
usart_set_attributes in rtems project all return -1 at v4.11.3 ,
should i put usart_read_polled function to a new task?
------------------ 原始邮件 ------------------
发件人: "787562067"<googcheng at qq.com>;
发送时间: 2019年3月26日(星期二) 晚上11:09
收件人: "joel"<joel at rtems.org>;
抄送: "users"<users at rtems.org>;
主题: 回复: Re: uart does not work
stm32f4 ，log odd , read seems nonblocked
---原始邮件---
发件人:"joel"<joel at rtems.org>
发送时间:2019年3月26日 星期二 下午8:39
收件人:"787562067"<googcheng at qq.com>
抄送:"rtems-users at rtems.org"<users at rtems.org>
主题:Re: uart does not work
Which bsp? Does the console driver have a set_attributes handler? Does it return false?
On Tue, Mar 26, 2019, 7:08 AM 787562067 <googcheng at qq.com> wrote:
HI, ALL!
when i run fileio test case, i got nothing;
when i run example from here http://zhgyuan.cn/downloads/uploads-file/201707/myapp.tar.gz 
[19:51:16.847]收←◆hello,this is my print task test!
RTEMS Shell on /dev/console. Use 'help' to list commands.
[/] # 
[19:51:17.177]收←◆hello,this is my print task test!
RTEMS Shell on /dev/console. Use 'help' to list commands.
[/] # 
[19:51:18.020]收←◆hello,this is my print task test!
RTEMS Shell on /dev/console. Use 'help' to list commands.
[/] # 
[19:51:19.306]收←◆hello,this is my print task test!
RTEMS Shell on /dev/console. Use 'help' to list commands.
[/] # 
[19:51:20.589]收←◆hello,this is my print task test!
RTEMS Shell on /dev/console. Use 'help' to list commands.
[/] # 
[19:56:17.932]TX→◇help
□
[19:56:17.941]RX←◆h
i dont know why. the uart read also does not work for me 
void testCom1(void) {
  char buffer[256] = {0};
  printf("*** Simple COM1 Test ***\n");
  //int fd = open("/dev/ttyS1", O_RDWR | O_NOCTTY | _FNDELAY);
  int fd = open("/dev/ttyS2", O_RDWR | O_NOCTTY);
  printf("\nOpened COM1, fd=%d\n\n", fd);
  if(fd < 0)
      printf("open error\n");
  #if 0
  if(fcntl(fd, F_SETFL, 0) < 0)  
  {  
    printf("fcntl failed!\n");  
    return;  
  }       
  else  
  {  
      printf("fcntl=%d\n",fcntl(fd, F_SETFL,0));  
  }
  #endif
  //fcntl(fd, F_SETFL, 0); // set blocked
  
  struct termios options;
  tcgetattr(fd, &options);
  bzero(&options, sizeof(options));
/* setting the baud rate */
  cfsetispeed(&options, B115200);
  cfsetospeed(&options, B115200);
  options.c_cflag |= (CLOCAL | CREAD);
  //options.c_cflag &= ~PARENB;
  //options.c_cflag &= ~CSTOPB;
  //options.c_cflag &= ~CSIZE;
  options.c_cflag |= (CS8 | CRTSCTS);
  options.c_iflag = IGNPAR| ICRNL;
  options.c_oflag = 0;
  options.c_lflag = ICANON;
  options.c_cc[VEOF] = 4;
  options.c_cc[VMIN] = 1;
  options.c_cc[VTIME] = 0;
  tcflush(fd, TCIFLUSH);
  tcsetattr(fd, TCSANOW, &options);  
      
  if(0 == isatty(fd))  
  {  
      printf("input is not a terminal device\n");  
      //return;  
  }
  int numBytes = write(fd, "Hello, I'm waiting for input..\r\n", 33);
  if (numBytes < 0) {
    printf("\nFailed to send from COM1!\n");
  }
  
  //wait input 
  printf("wait 5s \n");
  #if 1
  //(void) rtems_task_wake_after( 5 * rtems_clock_get_ticks_per_second() );
  numBytes = read(fd, buffer, 20);
  printf("read bytes %d\n", numBytes);
  strerror(errno);
  if (numBytes < 0) {
    printf("\nFailed to read from COM1!\n");
  }
  else if(numBytes == 0)
  {
    printf("read error return 0\n");
  }
  else
  {
    //buffer[numBytes] = 0; // terminate
    printf("rev: %s\n", buffer);
  }
  #endif
  //int read_cnt = uart_recv(fd, buffer, 20);
  //printf("rev: %s\n", buffer);
  //printf("read_cnt: %d\n", read_cnt);
  close(fd);
  rtems_task_delete(RTEMS_SELF);
}
hope you could help me check it , thx!
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