[OpenBIOS] b?branch

[Mark Cave-Ayland]

On 21/12/17 14:59, Programmingkid wrote:
> 
>> On Dec 21, 2017, at 9:36 AM, Jd Lyons <lyons_dj at yahoo.com> wrote:
>>
>>
>> I don’t know, this maybe an issue with the way we have defined “us”.
>>
>> Looking through the SLOF code it seems they call it like this in the timebase.fs:
>>
>> : tb@  ( -- tb )
>>     BEGIN tbu@ tbl@ tbu@ rot over <> WHILE 2drop REPEAT
>>     20 lshift swap ffffffff and or
>> ;
>>
>> : milliseconds ( -- ms ) tb@ d# 1000 * tb-frequency / ;
>> : microseconds ( -- us ) tb@ d# 1000000 * tb-frequency / ;
>>
>> : ms ( ms-to-wait -- ) milliseconds + BEGIN milliseconds over >= UNTIL drop ;
>> : get-msecs ( -- n ) milliseconds ;
>> : us  ( us-to-wait -- )  microseconds +  BEGIN microseconds over >= UNTIL  drop ;
>>
>> Not sure if I can port/hack this code over, the copier seems to have trouble with tbu@ tbl@?
>>
> 
> The ms and get-msecs words don't appear to be implemented correctly on OpenBIOS. 10000 ms should pause OpenBIOS for 10 seconds. It does not.
> 
> I did find a function called udelay() in the drivers/timer.c file. Maybe I can implement the word us using udelay(). Then the ms word could be implemented using the us word.

Yeah... I did start fixing up the timers in OpenBIOS (get-msecs works 
for SPARC) but didn't get around to finishing it. Another things for the 
TODO list I guess... implementing udelay() is probably a good starting 
point, but it has been a while since I looked at that code.


ATB,

Mark.