回复： usart read variable string

[787562067]

I have tried to code it as the attached file, but it does not work well, read return only one char when i input a string from PC serial port tool
at the same time, testcom1 function also is called more than one time, i dont know why


RTEMS4.11.3 on stm32f407
//below is the log
[15:01:32.168]收←◆*** Simple COM1 Test ***


Opened COM1, fd=3


fcntl=0
Hello, I'm waiting for input..
\0
[15:01:33.022]收←◆*** Simple COM1 Test ***


Opened COM1, fd=3


fcntl=0
Hello, I'm waiting for input..
\0
[15:01:34.322]收←◆*** Simple COM1 Test ***


Opened COM1, fd=3


fcntl=0
Hello, I'm waiting for input..
\0
[15:01:35.659]收←◆*** Simple COM1 Test ***


Opened COM1, fd=3


fcntl=0
Hello, I'm waiting for input..
\0
[15:01:43.622]发→◇abcdefg
□



------------------ 原始邮件 ------------------
发件人: "Joel Sherrill"<joel at rtems.org>;
发送时间: 2019年3月20日(星期三) 晚上7:48
收件人: "787562067"<googcheng at qq.com>;
抄送: "rtems-users at rtems.org"<users at rtems.org>; 
主题: Re: usart read variable string





On Wed, Mar 20, 2019, 4:48 AM 787562067 <googcheng at qq.com> wrote:

Hi all
I want to read usart variable string, but only find an API  int usart_read_polled(int minor)

is there a simple method to do this like using the idle interrupt




Normally applications do not use device specific methods. They use either the normal POSIX methods like read() with termios for settings or the printk() family of methods. 


Under the hood, the implementation will either be interrupt driven or polled at each clock tick.
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