On Thu, 28 May 2009, Terry wrote:

> Date: Thu, 28 May 2009 20:17:23 -0700
> From: Terry <[email protected]>
> To: [email protected]
> Subject: [Emc-users] Mesa-Hm2
> 
>
> Hi,
>
> As I was looking through the SVST8_4IM2.pin file I saw
> that the connections for P2 are almost the same but P3
> is alot different than the origional mi520.
>
> Do I make a new hal.io file for my machine and that
> will override the pinout that is listed for P3 in the SVST8_4IM2.bit file?

HostMot2 is different from the original HostMot configuration in that all FPGA 
I/O pins are GPIO unless special functions (like encoders or PWM generators) 
are enabled.

The original HostMot had only 4 axis of PWM and encoder signals on P2, leaving 
P3 and P4 as GPIO only.

The SVST8_4IM2 HostMot2 configuration follows the same pinout for encoder and 
PWM connections as the original HostMot but adds the capability of 4 more 
encoders and PWM generator on P3. It also adds and index mask inputs and 4 
hardware step generators on P4.

Because these special functions are only enabled if requested, P3 can be left 
as GPIO just like the original HostMot configuration.

For example if you invoke the HostMot2 driver with :

loadrt hm2_pci config="firmware=hm2/5i20/SVST8_4IM2.BIT num_encoders=4 
num_pwmgens=4 num_stepgens=0"

You will get a configuration that matches the pinout of the old HostMot 
firmware, (encoders and PWM generators 0 through 3 enabled on P2, but P3 and 
P4 left as GPIO)

Note the there are further HAL file changes needed as the old HostMot driver 
hardwired the GPIO pins as 8 out and 16 in on P3 and P4 to match the 7I37 
pinout. The HostMot2 driver needs to have the pin directions setup to suit the 
daughtercard/application

> I would then call this new .io file from the .ini file?
> A little direction here and I wont bother you guys
> anymore.The last statement was probably inaccurate.
>
> Thanks
>
> Terry Christophersen
>
>
>
>
>
>
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Peter Wallace
Mesa Electronics

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