Lpc2000

Hi 
I am using lpc2106 and SPI.
I can't get it to work, it should be simple but..

Here is what I do
//----------------------------------------------
PINSEL0 |= 0x5500;	// enable SPI pins
SPCR     = 0x20;	// set master mode
SPCCR    = 128;		// SCK =pclk/128


SPDR = c;		// start transfer
//-----------------------------------------------

but there is no activity on the  SCLK.

1) Should be SSEL be pull-up ? (it is always low)
How do activate/deactivate SSEL ?
(in the user manual on page 127 is say SSEL is not directly driven by
the master.It could be driven by a simple general purpose I/O under
software control.)
2) Should I still select SSEL as alternate function SSEL or general
purpose I/O ?


Please if any one have used SPI and SSEL, please comment

best regards

John

Hi John
Make sure you pull P0.7 (SSEL pin) to High (3.3V) I had alot of problems with this but It should resolve your problem.
 
Aminder

johnnorgaard2003 <john_2005@...> wrote:

Hi 
I am using lpc2106 and SPI.
I can't get it to work, it should be simple but..

Here is what I do
//----------------------------------------------
PINSEL0 |= 0x5500;      // enable SPI pins
SPCR     = 0x20;      // set master mode
SPCCR    = 128;            // SCK =pclk/128


SPDR = c;            // start transfer
//-----------------------------------------------

but there is no activity on the  SCLK.

1) Should be SSEL be pull-up ? (it is always low)
How do activate/deactivate SSEL ?
(in the user manual on page 127 is say SSEL is not directly driven by
the master.It could be driven by a simple general purpose I/O under
software control.)
2) Should I still select SSEL as alternate function SSEL or general
purpose I/O ?


Please if any one have used SPI and SSEL, please comment

best regards

John




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Regards,


Aminder Singh Athwal
		
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Hi Aminder

Ok I now have pull-up on SSEL pin. But how do I control it. Setting it
low when selecting the device ?
IOSET and IOCLR have no effect when any pin in configured as secondary
function(user manual p.82)

best regards


John

--- In lpc2000@yahoogroups.com, Aminder Athwal <aminderathwal@y...> wrote:
> 
> Hi John
> Make sure you pull P0.7 (SSEL pin) to High (3.3V) I had alot of
problems with this but It should resolve your problem.

>  
> Aminder
> 
> johnnorgaard2003 <john_2005@c...> wrote:
> 
> Hi 
> I am using lpc2106 and SPI.
> I can't get it to work, it should be simple but..
> 
> Here is what I do
> //----------------------------------------------
> PINSEL0 |= 0x5500;      // enable SPI pins
> SPCR     = 0x20;      // set master mode
> SPCCR    = 128;            // SCK =pclk/128
> 
> 
> SPDR = c;            // start transfer
> //-----------------------------------------------
> 
> but there is no activity on the  SCLK.
> 
> 1) Should be SSEL be pull-up ? (it is always low)
> How do activate/deactivate SSEL ?
> (in the user manual on page 127 is say SSEL is not directly driven by
> the master.It could be driven by a simple general purpose I/O under
> software control.)
> 2) Should I still select SSEL as alternate function SSEL or general
> purpose I/O ?
> 
> 
> Please if any one have used SPI and SSEL, please comment
> 
> best regards
> 
> John
> 
> 
> 
> 
> Yahoo! Groups SponsorADVERTISEMENT
> 
> 
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> 
> 
> 
> Regards,
> 
> 
> Aminder Singh Athwal
> 		
> ---------------------------------
>  ALL-NEW Yahoo! Messenger - all new features - even more fun!  
> 
> [Non-text portions of this message have been removed]

At 11:47 AM 10/12/04 +0000, you wrote:
>Ok I now have pull-up on SSEL pin. But how do I control it. Setting it
>low when selecting the device ?
>IOSET and IOCLR have no effect when any pin in configured as secondary
>function(user manual p.82)
You can't.  When using the SPI if SSEL goes low the microcontroller acts as 
a slave.  To select an external device you must use another pin.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III

Hi Robert

Ohh, I see. The SSEL in only a input to the LPC2106 to act as a slave
or master. Not to select an external slave device.
For selecting external device I have to use another I/O Pin.
Thanks Robert.

Best regards

John

--- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@a...> wrote:
> At 11:47 AM 10/12/04 +0000, you wrote:
> >Ok I now have pull-up on SSEL pin. But how do I control it. Setting it
> >low when selecting the device ?
> >IOSET and IOCLR have no effect when any pin in configured as secondary
> >function(user manual p.82)
> You can't.  When using the SPI if SSEL goes low the microcontroller
acts as 

> a slave.  To select an external device you must use another pin.
> 
> Robert
> 
> " 'Freedom' has no meaning of itself.  There are always restrictions,
> be they legal, genetic, or physical.  If you don't believe me, try to
> chew a radio signal. "
> 
>                          Kelvin Throop, III

John
 
Thats right you shouldn't have any problems now. I've got some code which you might find useful to read and write to pins. If you're intrested let me kno.
 
 
Aminder

johnnorgaard2003 <john_2005@...> wrote:

Hi Robert

Ohh, I see. The SSEL in only a input to the LPC2106 to act as a slave
or master. Not to select an external slave device.
For selecting external device I have to use another I/O Pin.
Thanks Robert.

Best regards

John

--- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@a...> wrote:
> At 11:47 AM 10/12/04 +0000, you wrote:
> >Ok I now have pull-up on SSEL pin. But how do I control it. Setting it
> >low when selecting the device ?
> >IOSET and IOCLR have no effect when any pin in configured as secondary
> >function(user manual p.82)
> You can't.  When using the SPI if SSEL goes low the microcontroller
acts as 
> a slave.  To select an external device you must use another pin.
> 
> Robert
> 
> " 'Freedom' has no meaning of itself.  There are always restrictions,
> be they legal, genetic, or physical.  If you don't believe me, try to
> chew a radio signal. "
> 
>                          Kelvin Throop, III




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Regards,


Aminder Singh Athwal
		
---------------------------------
 ALL-NEW Yahoo! Messenger - all new features - even more fun!  

[Non-text portions of this message have been removed]

Hi Aminder,

I'm going to interface LPC21xx with Serial DataFlash(tm) so that How 
can I obtain your worked SPI code for jump start. Can you post your 
code to this group?

Thanks,
Suriyan.

--- In lpc2000@yahoogroups.com, Aminder Athwal 
<aminderathwal@y...> wrote:
> John
>  
> Thats right you shouldn't have any problems now. I've got some code 
which you might find useful to read and write to pins. If you're intrested 
let me kno.
>  
>  
> Aminder
> 
> johnnorgaard2003 <john_2005@c...> wrote:
> 
> Hi Robert
> 
> Ohh, I see. The SSEL in only a input to the LPC2106 to act as a slave
> or master. Not to select an external slave device.
> For selecting external device I have to use another I/O Pin.
> Thanks Robert.
> 
> Best regards
> 
> John
> 
> --- In lpc2000@yahoogroups.com, Robert Adsett 
<subscriptions@a...> wrote:
> > At 11:47 AM 10/12/04 +0000, you wrote:
> > >Ok I now have pull-up on SSEL pin. But how do I control it. Setting 
it
> > >low when selecting the device ?
> > >IOSET and IOCLR have no effect when any pin in configured as 
secondary
> > >function(user manual p.82)
> > You can't.  When using the SPI if SSEL goes low the microcontroller
> acts as 
> > a slave.  To select an external device you must use another pin.
> > 
> > Robert
> > 
> > " 'Freedom' has no meaning of itself.  There are always restrictions,
> > be they legal, genetic, or physical.  If you don't believe me, try to
> > chew a radio signal. "
> > 
> >                          Kelvin Throop, III
> 
> 
> 
> 
> Yahoo! Groups SponsorADVERTISEMENT
> 
> 
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> 
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>   
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Service. 

> 
> 
> 
> Regards,
> 
> 
> Aminder Singh Athwal
> 		
> ---------------------------------
>  ALL-NEW Yahoo! Messenger - all new features - even more fun!  
> 
> [Non-text portions of this message have been removed]