Re: Setting bitrate from user-space application

[Tom Evans <tom_usenet@optusnet.com.au>]

On 26/11/2015 3:17 AM, Guillaume Picquet wrote:
> Le 25/11/2015 17:04, Oliver Hartkopp a écrit :
>> Hi Guillaume,
>>
>> On 11/25/2015 03:58 PM, Marc Kleine-Budde wrote:
>>> On 11/25/2015 03:02 PM, Guillaume Picquet wrote:
>>>> Hi all,
>>>>
>>>> I prefer to ask first to those who know.
>>>>
>>>> What is the 'normal' way of setting CAN bitrate from user-space
>>>> application ?

The "abnormal" way I do it is basically:

     char *pName = (a_eDevice == CAN_BUS_CAN_0) ? "can0" : "can1";
     sprintf(vBuf,
             "/usr/local/sbin/canconfig %s stop > /dev/null ; "
             "/usr/local/sbin/canconfig %s bitrate %d > /dev/null ; "
             "/usr/local/sbin/canconfig %s start > /dev/null\n",
             pName, pName, a_nKbaud * 1000, pName);
             nRc = system(vBuf);

Or if using Freescale's 2.6.35 driver, "ifconfig can0 down/up" and
"echo 500000 > /sys/class/devices/platform/FlexCAN.0/bitrate" in the 
above "system()" call.

I realise the above may be horrible, but I'd like some more information 
on why it might be bad.

Tom