Hi Glenn: Thanks for your quick answer. Now I could read ADC data from Roach through the snap_bram. But unfortunately, it seems that the data I read is not right.
I am using the tcpborphserver at port 7147.The command is wordread. Do you have some experience with Roach? Thanks Wan ________________________________ From: G Jones [mailto:[email protected]] Sent: Tuesday, 2 June 2009 10:07 AM To: Cheng, Wan (ATNF, Marsfield) Cc: [email protected] Subject: Re: [casper] FW: How to use snap? Wan, I think that depends on how your programming language of choice treats the file. For example, in C if you just open the file, you can read out one byte at a time, or you could read 4 bytes at a time and cast it as a 32 bit integer. Glenn On Mon, Jun 1, 2009 at 5:05 PM, <[email protected]> wrote: HI Glenn: Thanks for your great help. By the way, what's the offset when I read from snap_bram? 1 or 4? Thanks Wan ________________________________ From: G Jones [mailto:[email protected]<mailto:[email protected]>] Sent: Wednesday, 27 May 2009 11:31 AM To: Cheng, Wan (ATNF, Marsfield) Cc: [email protected]<mailto:[email protected]> Subject: Re: [casper] FW: How to use snap? Wan, The simplest operation of the snap block is as follows: Write 0 to the snap_ctrl file/register Write 7 to the snap_ctrl file/register to force enable, trigger, and write enable to be true (look under the snap mask to see how it works) Read snap_addr and wait for it to be snaplength - 1 (2047 by default). Usually this is essentially instantaneous, so no need to actually check unless you want to be sure the snap captured something. Read the snap_bram file, which should be snaplength 4-byte words (2048x4 bytes). Glenn On Tue, May 26, 2009 at 4:47 PM, <[email protected]> wrote: Hi Henry: Could you please give me some idea about snap block? Thanks Wan ________________________________ From: Cheng, Wan (ATNF, Marsfield) Sent: Tuesday, 26 May 2009 4:44 PM To: '[email protected]<mailto:[email protected]>' Subject: FW: How to use snap? Any idea? How can I access the whole block ram of snap from the CPU? Thanks Wan ________________________________ From: Cheng, Wan (ATNF, Marsfield) Sent: Monday, 25 May 2009 5:10 PM To: '[email protected]<mailto:[email protected]>' Subject: How to use snap? Hi: I find the snap_addr of snap block is output only. Is there anyway, I can read out all the data from the snap block memory. Is there anyway I can specify the read address? Thanks Wan
