Hi,
my can controller is attached to my microcontrolled over several pins.
I allready have procedures to access the registers of the can controller.
How do i realized memory mapped IO ??

Regards
Thorsten

On Feb 8, 8:09 am, Thorsten Kiefer <thorstenkie...@gmx.de> wrote:
> Hi,
> my can controller is attached to my microcontrolled over several pins.
> I allready have procedures to access the registers of the can controller.
> How do i realized memory mapped IO ??
>
> Regards
> Thorsten

Tell us the IC part numbers.

Most common microcontrollers don't support memory mapping of external
IO devices.

If your microcontroller supports external memory mapped IO then you
need to read the datasheet that describes exactly how it works.
You may need address decoding logic, that depends on the details of
the can controller. If the can controller only has a typical I2C style
interface
then making it memory mapped might require significant extra logic to
make it IO mapped and probably would not be a worthwile thing to do.

Bob

Infineon XC164CM-16ff and Bosch CC770.

I found out, that the CM-version has no external mem-controller.
But the CS-version has one. Bad luck for me

Thanks, Bob


Bob wrote:

> On Feb 8, 8:09 am, Thorsten Kiefer <thorstenkie...@gmx.de> wrote:
>> Hi,
>> my can controller is attached to my microcontrolled over several pins.
>> I allready have procedures to access the registers of the can controller.
>> How do i realized memory mapped IO ??
>>
>> Regards
>> Thorsten
>
> Tell us the IC part numbers.
>
> Most common microcontrollers don't support memory mapping of external
> IO devices.
>
> If your microcontroller supports external memory mapped IO then you
> need to read the datasheet that describes exactly how it works.
> You may need address decoding logic, that depends on the details of
> the can controller. If the can controller only has a typical I2C style
> interface
> then making it memory mapped might require significant extra logic to
> make it IO mapped and probably would not be a worthwile thing to do.
>
> Bob

On Fri, 08 Feb 2008 09:09:43 +0100, Thorsten Kiefer wrote:

> my can controller is attached to my microcontrolled over several pins.
> I allready have procedures to access the registers of the can controller.
> How do i realized memory mapped IO ??
>

Treat your IO devices like memory locations.

Cheers!
Rich