[U-Boot-Users] Problems with udelay() on AT91RM9200 !

[U-Boot-Users] Problems with udelay() on AT91RM9200 !

[Steven Scholz]

Hi there,

I just noticed that the implementation of udelay() - i.e udelay_masked() - 
resets the timer. Why is that?

This prevents me from doing something like

	start = get_timer(0);	/* get current time */
	do {
		if ( get_timer(start) > timeout) {
			puts(" TIMEOUT!");
			break;
		}
		putc('.');
		udelay(100000);
	} while (1);

:-(

--

Steven

[U-Boot-Users] Problems with udelay() on AT91RM9200 !

[Steven Scholz]

Wolfgang Denk wrote:

> In message <41A1F410.6040107@imc-berlin.de> you wrote:
> 
>>I just noticed that the implementation of udelay() - i.e udelay_masked() - 
>>resets the timer. Why is that?
> 
> Because of a bug?

Why didn't I think of this! ;-)

But seriously what's the point in letting the timer run with 40 or 80 MHz?
In my case udelay won't work for delays > 107ms anyway.... :-(

--
Steven

[U-Boot-Users] Problems with udelay() on AT91RM9200 !

[Wolfgang Denk]

In message <41A22A87.3050609@imc-berlin.de> you wrote:
> 
> Why didn't I think of this! ;-)

Dunno.

> But seriously what's the point in letting the timer run with 40 or 80 MHz?
> In my case udelay won't work for delays > 107ms anyway.... :-(

Then make it run slower if you like.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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