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 -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ Reconos-devel_lists.reconos.de mailing list reconos-devel@lists.reconos.de https://ml01.ispgateway.de/mailman/listinfo/reconos-devel_lists.reconos.de
