[U-Boot-Users] what is the purpose of "serial_tstc()"?

[U-Boot-Users] what is the purpose of "serial_tstc()"?

[wnlee1109 at gmail.com]

Hello, u-boot community,

When I wrote the hardware dependent parts of serial functions, 
I cannot understand what should I write for "serial_tstc()".

What is the purpose of "serial_tstc()"?
Does anyone know?

Thanks
Wayne

[U-Boot-Users] what is the purpose of "serial_tstc()"?

[Frank]

It returns a true if there is a char in the serial input buffer.
I usually use it when I'm in an inifinit loop and want to break
out if some hits the keyboard. Similar to "?key" in Forth.:-)

--- wnlee1109 at gmail.com wrote:
> 
> Hello, u-boot community,
> 
> When I wrote the hardware dependent parts of serial functions,
> 
> I cannot understand what should I write for "serial_tstc()".
> 
> What is the purpose of "serial_tstc()"?
> Does anyone know?
> 
> Thanks
> Wayne
> 
> 
> 
> 
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