OK, I can see many things about sectors of 512 bytes, this doesn't fit my need at all, as I need 1024 bytes / sectors. I'd say sd_card library shouldn't have anything related to sectors or the like, as it is something related to file systems, and you may just use your SD-Card without considering any of these.
But since I'm no SD expert, there could be a reason to do so. Still, setting address with sd_start_read(sector) ends with accessing SD-card on a byte-level, not sector. Cheers, Seb 2011/4/20 Sebastien Lelong <[email protected]> > Hi Matt, > > Some more feedback about current sd_card.jal library: > > - send_command() should be prefixed with sd_send_command() to avoid > potential collision > - I wanted to use sd_data_byte, to read card byte by byte, but it seems > already "infected" by some filesystems stuff: it increment a counter related > to sector, dealing with 512 bytes. > - in the same procedure, there seems to be special values when reading > SPI (eg. 0xFE). What if I need to read these values ? I don't understand the > following loop: > > if sd_byte_count == 0 then -- beginning of sector read > while spi_master != 0xFE loop -- wait till data is ready to read > end loop > end if > > Basically this is why my sample doesn't work, commenting the "while" loop > fixes the issue. > > Shouldn't I use this procedure ? Shouldn't it be completely independent > from filesystem concerns ? > > Thanks for your light ! > > Cheers, > Seb > > > > 2011/4/19 mattschinkel <[email protected]> > >> Sure, and also check if pragma inline is a good idea. >> >> Matt. >> >> On Apr 19, 12:33 pm, Sebastien Lelong <[email protected]> >> wrote: >> > 2011/4/19 mattschinkel <[email protected]> >> > >> > > I prefer to take the spi init procedure and split it into two. >> > >> > OK, do you want me to take care of this ? >> > >> > Cheers, >> > Seb >> > >> > >> > >> > > spi_master_hw_set_mode(byte in mode) >> > > spi_master_hw_set_speed(byte in speed) >> > >> > > The set speed procedure may not be used as often, however there are >> > > some devices that require SPI commands to be slower then SPI data >> > > transfers. For example, mp3 decoder vs1053b >> > >> > > Then add another alias to the sample >> > >> > > alias spi_master_set_mode is spi_master_hw_set_mode >> > >> > > Matt. >> > >> > > On Apr 19, 6:42 am, Sebastien Lelong <[email protected]> >> > > wrote: >> > > > OK, thanks for pointing this. How can we solve this in order >> sd_card.jal >> > > to >> > > > be fully generic ? I remember we have the exact same problem with >> > > ethernet >> > > > libs. >> > >> > > > Cheers, >> > > > Seb >> > >> > > > 2011/4/19 mattschinkel <[email protected]> >> > >> > > > > Thanks. >> > >> > > > > You may also want to pay attention to these lines (if you are >> using >> > > > > more then one SPI device that use different modes) >> > >> > > > > -- put spi into mode 11 >> > > > > if SD_ALWAYS_SET_SPI_MODE == TRUE then >> > > > > SSPCON_CKP = 1 >> > > > > SSPSTAT_CKE = 0 >> > > > > end if >> > >> > > > > All of my SPI libs use these lines so the devices can be used >> > > > > together. >> > >> > > > > SD_ALWAYS_SET_SPI_MODE is defined in the sample. >> > >> > > > > Matt. >> > >> > > > > -- >> > > > > You received this message because you are subscribed to the Google >> > > Groups >> > > > > "jallib" group. >> > > > > To post to this group, send email to [email protected]. >> > > > > To unsubscribe from this group, send email to >> > > > > [email protected]. >> > > > > For more options, visit this group at >> > > > >http://groups.google.com/group/jallib?hl=en. >> > >> > > > -- >> > > > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org >> > >> > >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/jallib?hl=en. >> >> > > > -- > Sébastien Lelong > http://www.sirloon.net > http://sirbot.org > -- Sébastien Lelong http://www.sirloon.net http://sirbot.org -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
