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, <wan.ch...@csiro.au> 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:glenn.calt...@gmail.com] > *Sent:* Wednesday, 27 May 2009 11:31 AM > *To:* Cheng, Wan (ATNF, Marsfield) > *Cc:* casper@lists.berkeley.edu > *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, <wan.ch...@csiro.au> 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:* 'casper-boun...@lists.berkeley.edu' >> *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:* 'casper-boun...@lists.berkeley.edu' >> *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 >> > >
