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
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