Lpc2000

Ian,

Does the original port of the uIP code to the CS8900A run correctly on
your board?  You do have an LPC-E2124?

-- Paul. 

> -----Original Message-----
> From: Ian Wraith [mailto:i.wraith@...] 
> Sent: 11 July 2005 10:42
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] CS8900A question
> 
> Hello
>       I am currently writing some low level code for interfacing the
> LPC2124 to a CS8900A (it is an Olimex LPC2124 board). I am 
> basing my code around that on the Rowley Associates website. 
> There are no problems initialising the CS8900 and I can even 
> read its EISA company ID correctly. The problem comes when I 
> poll the CS8900 to see if a frame is waiting. My initial code 
> used the RxEvent (0x0124) register ..
> 
> cs8900a_write(ADD_PORT,PP_RxEvent);
> u=cs8900a_read_addr_high_first(DATA_PORT);
> 
> (where DATA_PORT is 0x0c)
> 
> this works fine. But when I tried to read the RXLength 
> (0x402) word I just received garbage. So to try and diagnose 
> this I thought I would try and read the RxStatus (0x400) word 
> which according to the datasheet should be the same as the 
> RxEvent word. But when I tried the code ..
> 
> cs8900a_write(ADD_PORT,PP_RxStatus);
> u=cs8900a_read_addr_high_first(DATA_PORT);
> 
> I again get garbage and a result different to that contained 
> in Rx_Event.
> 
>   Can anyone tell me where I'm going wrong here ? Its very 
> odd how I can read data from some locations but not others.
> 
> Regards
> 
> Ian
> 
> 
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