Hi Markus Thanks! That worked :-)
Cheers, Ariane Markus wrote: > Hello Ariane, > > as far as I know the addresses for burst accesses to the RAM have to be > double-word aligned (1 word contains 4 bytes). That means that probably a > packet length of 136 should work. > > Can you test this? > > Best regards, > > Markus > > -------- Original-Nachricht -------- >> Datum: Tue, 08 Feb 2011 11:45:28 +0100 >> Von: Ariane Keller <ariane.kel...@tik.ee.ethz.ch> >> An: Discussions for internal ReconOS development >> <reconos-devel@lists.reconos.de> >> Betreff: [reconos-devel] reconos_write_burst > >> Hi all >> >> I've got a question concerning the reconos_write_burst (and the >> reconos_read_burst) functions. >> They are designed to copy 128 bytes at a time from hw to sw or vice >> versa. What happens, if you copy things that are not aligned to 128 bytes? >> E.g. I had problems when I did something like the following (where >> rx_packet_len is an arbitrary number). >> >> reconos_write_burst(local_address_x + count, rx_address + count); >> if done then >> count := count + 128; >> end if; >> if count >= rx_packet_len then >> count := 0; >> os_sync_state <= STATE_NOTIFY; >> local_address_x := local_address_x + rx_packet_len; >> rx_address := rx_address + rx_packet_len; >> end if; >> >> If rx_packet_len is a multiple of 128 everything works as expected. >> If it is another number, e.g. 132 the first packet is still ok, but the >> second packet gets transmitted wrongly, see below: >> >> Correct: >> AAAA >> BBBB >> CCCC >> DDDD >> >> Actual: >> >> BBBB >> BBBB >> DDDD >> DDDD >> >> Are there any restrictions on the alignment of the addresses in the >> reconos_*_burst functions? >> >> Thanks a lot, >> Ariane >> _______________________________________________ >> Reconos-devel_lists.reconos.de mailing list >> reconos-devel@lists.reconos.de >> https://ml01.ispgateway.de/mailman/listinfo/reconos-devel_lists.reconos.de > _______________________________________________ Reconos-devel_lists.reconos.de mailing list reconos-devel@lists.reconos.de https://ml01.ispgateway.de/mailman/listinfo/reconos-devel_lists.reconos.de
