MCBSP as GPIO woes

Hi

I'm new to all things DSP and I'm having problems understanding some
of the instructions for using some of the MCBSP signals as GPIO on a
c6711 DSK....

I'm confused about the use of of the CSL instruction "MCBSP_setPins"
that clams to set the status of MCBSP signals configured as GPIO. It
accepts a handle and a signal name....

My question is how do I specify whether to set the signal high or low???

On a related note, I've noticed the instruction "SET_PIN" in some of
TI's examples... WHere can I find the include file for this???

Thanks in advance

Steve Minshull Start a New Thread

The signals you specify are set high, the rest are all set low.

Mike

-----Original Message-----
From: c... [mailto:c...] On Behalf Of
s_minshull
Sent: Monday, July 17, 2006 7:55 AM
To: c...
Subject: [c6x] MCBSP as GPIO woes

Hi

I'm new to all things DSP and I'm having problems understanding some
of the instructions for using some of the MCBSP signals as GPIO on a
c6711 DSK....

I'm confused about the use of of the CSL instruction "MCBSP_setPins"
that clams to set the status of MCBSP signals configured as GPIO. It
accepts a handle and a signal name....

My question is how do I specify whether to set the signal high or low???

On a related note, I've noticed the instruction "SET_PIN" in some of
TI's examples... WHere can I find the include file for this???

Thanks in advance

Steve Minshull Start a New Thread

Is there any way of toggling individual signals rather than having to
specify each signal every time you call the function??
--- In c..., "Mike R" wrote:
>
> The signals you specify are set high, the rest are all set low.
>
> Mike
>
> -----Original Message-----
> From: c... [mailto:c...] On Behalf Of
> s_minshull
> Sent: Monday, July 17, 2006 7:55 AM
> To: c...
> Subject: [c6x] MCBSP as GPIO woes
>
> Hi
>
> I'm new to all things DSP and I'm having problems understanding some
> of the instructions for using some of the MCBSP signals as GPIO on a
> c6711 DSK....
>
> I'm confused about the use of of the CSL instruction "MCBSP_setPins"
> that clams to set the status of MCBSP signals configured as GPIO. It
> accepts a handle and a signal name....
>
> My question is how do I specify whether to set the signal high or low???
>
> On a related note, I've noticed the instruction "SET_PIN" in some of
> TI's examples... WHere can I find the include file for this???
>
> Thanks in advance
>
> Steve Minshull Start a New Thread

Steve-

> Is there any way of toggling individual signals rather than having to
> specify each signal every time you call the function??

You can go a little faster by using direct instructions instead of CSL function
calls. For example this line writes to TIMER1 control register, makes TOUT1 a GPIO,
sets TOUT1 pin to high:

*(unsigned volatile int*)TIMER1_CTRL = ((*(unsigned volatile int*)TIMER1_CTRL) &
0xFFFFFFFA) | 4;

You can do similar for McBSP and GPIO registers. Also you might want to disable and
re-enable interrupts around such access.

But this is only going to gain some speed. If I recall, C671x limits successive I/O
pin access to around 90 nsec, so that's the lower limit. This has to do with
internal CPU bus stalls.

-Jeff
> --- In c..., "Mike R" wrote:
> >
> > The signals you specify are set high, the rest are all set low.
> >
> > Mike
> >
> > -----Original Message-----
> > From: c... [mailto:c...] On Behalf Of
> > s_minshull
> > Sent: Monday, July 17, 2006 7:55 AM
> > To: c...
> > Subject: [c6x] MCBSP as GPIO woes
> >
> > Hi
> >
> > I'm new to all things DSP and I'm having problems understanding some
> > of the instructions for using some of the MCBSP signals as GPIO on a
> > c6711 DSK....
> >
> > I'm confused about the use of of the CSL instruction "MCBSP_setPins"
> > that clams to set the status of MCBSP signals configured as GPIO. It
> > accepts a handle and a signal name....
> >
> > My question is how do I specify whether to set the signal high or low???
> >
> > On a related note, I've noticed the instruction "SET_PIN" in some of
> > TI's examples... WHere can I find the include file for this???
> >
> > Thanks in advance
> >
> > Steve Minshull
> >
> >
> >
> >
> >
> >
> >
> > Start a New Thread

Various options:

- Use MCBSP_getPins to get the current pin settings, modify and write back
using MCBSP_setPins.
- Use the MCBSP_RGETH and MCBSP_RSETH macros to read, modify and write the
PCR register.

Either of these could be encapsulated as your own macro to keep the main
code cleaner.

Mike

-----Original Message-----
From: c... [mailto:c...] On Behalf Of
s_minshull
Sent: Tuesday, July 18, 2006 5:49 AM
To: c...
Subject: [c6x] Re: MCBSP as GPIO woes

Is there any way of toggling individual signals rather than having to
specify each signal every time you call the function??
--- In c..., "Mike R" wrote:
>
> The signals you specify are set high, the rest are all set low.
>
> Mike
>
> -----Original Message-----
> From: c... [mailto:c...] On Behalf Of
> s_minshull
> Sent: Monday, July 17, 2006 7:55 AM
> To: c...
> Subject: [c6x] MCBSP as GPIO woes
>
> Hi
>
> I'm new to all things DSP and I'm having problems understanding some
> of the instructions for using some of the MCBSP signals as GPIO on a
> c6711 DSK....
>
> I'm confused about the use of of the CSL instruction "MCBSP_setPins"
> that clams to set the status of MCBSP signals configured as GPIO. It
> accepts a handle and a signal name....
>
> My question is how do I specify whether to set the signal high or low???
>
> On a related note, I've noticed the instruction "SET_PIN" in some of
> TI's examples... WHere can I find the include file for this???
>
> Thanks in advance
>
> Steve Minshull Start a New Thread