AT91SAM9260: How to output PCK0 clock on a GPIO pin

On Mon, 31 Aug 2009 15:58:50 -0400, Stephen Munnings
[off-list ref] wrote:

Sergey Matyukevich wrote:

quoted

Hi,
 
  

quoted

And how do I turn on the PMC clocks for the GPIO?
    

Assigning gpio pin PC6 to TIOB2 peripheral is only a part of the work.
Timer counters may operate in different modes. Take a look at
the datasheet for at91sam9260, timer counters are covered in chapter 34.

quoted

It looks like 'waveform mode' is what you need (see 34.5.10, 34.5.11).
Before you get desired output on PC6 pin you will have to turn on
waveform operating mode for TIOB2 and to configure its wave shapes.
 
Thanks,
Sergey
  

hmmmm....

PCK0 is *not*  a TC pin - it is a clock output from the Power Management 
Controller.
(Section 25.6)
It should be as easy as dividing down one of the primary clock sources 
and then enabling
the appropriate GPIO pin as the appropriate peripheral.

Ahah - there is the problem.....  PCK0 is not available on PC6 - it must 
be set as peripheral B
on pin PC1 or PB30 as Peripheral A - no other choices available...

PC6 is indeed TIOB2 (one of the counter timers)

OK, I see this thread unfolding, thank you!

This is what I have now to test pck0 on PC1:

at91_set_B_periph(AT91_PIN_PC1, 0);
pck0=clk_get(NULL, "pck0");
pll=clk_get(NULL, "plla");
clk_set_parent(pck0, pll);
clk_set_rate(pck0, 50000000);
clk_enable(pck0);

But I don't get a clean clock on PC1. In the end I will still need to get
the TC clock on PC6 but I for the time being I want to be able to generate
any clock out first!

Is there something else to do?

-- 
Pedro