Lpc2000

I think I have the same problem with CS8900A.
I use MAM=full, and cclk=60MHz
Could You please explain where this delay loop should be added:
1. between bits toggling I0SET=IOW, and I0CLR=IOW
2. between cs8900_read() and cs8900_write() functions

robert

Luciano Almeida wrote:

> I had the same problem.
> 
> Solution: insert some delay cycles between the write and the read. (I put :
> static int dummy = 1;
> #define delay()	{int
> delayCtr=0;for(delayCtr=0;delayCtr<10;delayCtr++){dummy+=dummy;dummy+=delay;
> }}
> ) and didn't give a second tought about it. (yes, it's dumb, but it seems to
> work. Yes, it can be improved).
> 
> What can be? I think it has something to do about the pin toggle time (lower
> than the time between the read and the write of de arm) or to the timings of
> the CS8900 (I think it says something like 135 ns between the write and read
> times). (This is a guess, remember.)
> 
> As you can guess, I didn't investigate it...
> 
> Funny thing is that I only saw this with the GCC, when I tried the
> crossworks, the code worked. (I used the uIP and FreeRTOS).
> 
> Best of lucks,
> 
> Luciano
> 
> 
>>-----Original Message-----
>>From: lpc2000@yahoogroups.com 
>>[mailto:lpc2000@yahoogroups.com] On Behalf Of ian_wraith
>>Sent: Monday, July 11, 2005 4:17 PM
>>To: lpc2000@yahoogroups.com
>>Subject: [lpc2000] Re: CS8900A question
>>
>>Hello
>>
>>--- In lpc2000@yahoogroups.com, Ian Wraith <i.wraith@s...> wrote:
>>
>>>There are no problems initialising the CS8900 and I can 
>>
>>even read its 
>>
>>>EISA company ID correctly.
>>
>> I have just double checked this and it seems I can't read 
>>the company ID correctly after all. When I check this my 
>>program returns a value of 0x6355 where as the actual value 
>>should be 0x630E. So I can read the first byte correctly but 
>>the lower one is always
>>0x55 (an alternating pattern of 0's and 1's). My problem 
>>therefore is in the code that reads a word from the CS8900.
>>
>> My apologies for wasting peoples time.
>>
>>Regards
>>
>>Ian
>>
>>
>>
>>
>> 
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