Re: [Gumstix-users] Serial Comms

[Grahame J. <gb...@th...>]

Hi,

I have got this working from my PC however on the gumstix the signals 
are inverted.
On the PC the tx output is sitting at -12V and the signal is pulled high 
to represent a 0.
On the gumstix the tx output is +3.3V and a signal is pulled low to 
represent a 0.

Is there something really simple I am missing here?  Should I just 
invert each bit?


Thanks

Grahame Jordan



Craig Hughes wrote:

> Better than setting everything to 0, which is generally not what you  
> want, you should fetch the structure using tcgetattr() and then just  
> modify what you want to modify.  Check sources/rok-flash/rok-flash.c  
> at the top for example.
>
> C
>
> On Oct 12, 2005, at 12:33 AM, Grahame Jordan wrote:
>
>> I am setting the control lines as follows and have zeroed the others
>> attr.c_iflag = 0;
>> attr.c_oflag = 0;
>> attr.c_cflag = CLOCAL | CREAD | CS8;
>> attr.c_lflag = 0;
>> attr.c_cc[ VTIME ] = 0; // timeout in tenths of a second
>> attr.c_cc[ VMIN ] = 1;  // Only wait for a single char
>>
>> // Control options
>> // 8n1
>> attr.c_cflag &= ~PARENB;
>> attr.c_cflag &= ~CSTOPB;
>> attr.c_cflag &= ~CSIZE;
>> attr.c_cflag |= CS8;
>>
>> attr.c_cflag |= (CLOCAL | CREAD);
>>
>
>
>
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