Re: [Xenomai] How to use rtdm_(io/m)map_to_user

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 04/24/2013 06:38 PM, Victor Hiairrassary wrote:

> On 04/23/2013 08:29 PM, Gilles Chanteperdrix wrote:
>>
>> The register access is almost certainly the wrong abstraction layer.
>> If you need writing to registers 2 to 13 starts a motor, then, there
>> should be an ioctl START_THE_MOTOR, which implementation in RTDM driver
>> writes to registers 2 to 13. In other words, without knowing what you do
>> with this FPGA there is no way to answer.
>>
>> Anyway, if the 1024 registers are 1024 parameters of the FPGA which you
>> need to configure individually, you can create an ioctl with a structure
>> where you pass the register number and the value.
>>
>>
> Really thanks for your answers ! We have some actions binded to registers :
> for example, read registers 5 return current speed, etc.
> 
> So we will use an real-time device driver ! Do we need to call 
> devm_request_and_ioremap()
> in driver initialization, like in linux device driver? i.e. is it 
> allowed and recommended with rtdm?


Calling ioremap from an RTDM driver should not raise any problems.

-- 
                                                                Gilles.