Can't read Card Specific Data from SD Card (rtems-4.9.0)
Robert S. Grimes
rsg at alum.mit.edu
Thu Oct 9 12:45:52 UTC 2008
Thomas Doerfler wrote:
> Can you monitor the SPI signals at the SDCard with an oscilloscope, I
> think the proper relationship between SEL, CLK and Data lines is crucial.
>
Yes, of course they are - that's why I love my four channel 'scope!
> - - Did you verify the baudrate is correct (not too high)?
>
Yes. I had started with 6.25 MHz, but switched now to 391 kHz because
of the MMC startup requirement - same results. (While I'm at it, I will
only be using SD cards, so can I run only at the higher 6.25 MHz clock?
>From the SanDisk manual and other stuff I've read, the slower clock rate
is needed to support MMC cards during initialization; do I need that
rate even if I won't be using MMC cards?
> - - which is the real relationship between clock and the both data lines,
> how much time is between the (de-)activation of SEL to the data transfers?
>
Hmm... You know, up until right now, I didn't think you were onto
anything I've already checked. However, the whole CS (aka SEL) issue
has popped front and center. If you recall, the Virtex SPI IP provides
manual and automatic CS modes; this is part of the purpose of the
spi_sel_per_word parameter that's been added to the transfer mode
structure. At this point, it doesn't seem to matter which strategy I
use. However, the automatic mode is quite fast; the CS is de-activated
for only a clock cycle between bytes, which could be entirely missed by
the card.
So, is the CS supposed to frame individual bytes, and if so, what is the
timing needed? How long must it be inactive between bytes?
The real problem is that I haven't been able to find any real SPI timing
information about these darn cards! Can anyone point me to a suitable
reference?
> - - did you check with different SDcards?
>
Yes, two different cards by two different manufacturers.
> maybe this will give some insights.
>
Thanks, Thomas,
-Bob
> wkr,
> Thomas.
>
>
> Robert S. Grimes wrote:
>
>> I've firmed up my hardware, and things seem much better. I seem to be
>> able to reliably set SPI mode, initialize the card, and read the CID
>> information. However, I cannot get the card to send its CSD. In order to
>> attempt some progress, I've intentionally ignored errors when sending
>> the SD_CARD_CMD_SEND_CSD command, and attempt to interpret the
>> information that is returned, but it is all nonsense. This is the
>> results from the aforementioned command:
>>
>> sd_card_send_command: Error: Response: ff:ff 49:ff 00:ff 00:ff 00:ff
>> 00:ff 95:82
>> ff:[7f] ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff
>>
>> I don't understand the 82 and 7f that it seems to find in the response
>> data; shouldn't I see something like {ff} 01 {ff} fe <CSD bytes>?
>> By the way, it seems I need to set both clock_inv and clock_phs true in
>> the rtems_libi2c_tfr_mode_t structure used to set the transfer mode.
>> This surprised me a bit, but then again, the other three combinations
>> didn't work - I brute-forced it and tried all four, because I couldn't
>> find documentation specifying which to use, and because nothing was
>> working at the time ;-). Anyway, does that sound right?
>>
>> Any ideas? Thanks,
>> -Bob
>>
>> P.S. Here is the full output as it stands:
>>
>> sd_card_driver_init: Ok: Get driver entry
>> sd_card_start: Ok: Send start
>> virtex_spi_ioctl
>> virtex_spi_set_tfr_mode
>> virtex_spi_char_mode
>> sd_card_start: Ok: Set transfer mode
>> sd_card_start: Ok: Send address
>> sd_card_driver_init: Ok: Start
>> sd_card_driver_init: Ok: Register disk IO driver
>> sd_card_wait: Ok: Busy
>> sd_card_driver_init: Ok: Wait
>> sd_card_driver_init: Ok: Active chip select delay
>> sd_card_stop: Ok: Send stop
>> sd_card_driver_init: Ok: Stop
>> sd_card_driver_init: Ok: Send start
>> virtex_spi_ioctl
>> virtex_spi_set_tfr_mode
>> virtex_spi_char_mode
>> sd_card_driver_init: Ok: Set transfer mode
>> sd_card_driver_init: Ok: Inactive chip select delay
>> sd_card_driver_init: Ok: Send address
>> sd_card_stop_multiple_block_write: Ok: Wait
>> sd_card_stop_multiple_block_write: Ok: Write stop transfer token
>> sd_card_wait: Ok: Busy
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0xff
>> sd_card_send_command: Token [09]: 0xff
>> sd_card_send_command: Token [10]: 0xff
>> sd_card_send_command: Token [11]: 0xff
>> sd_card_send_command: Token [12]: 0xff
>> sd_card_send_command: Token [13]: 0xff
>> sd_card_send_command: Token [14]: 0xff
>> sd_card_send_command: Token [15]: 0xff
>> sd_card_send_command: Token [16]: 0xff
>> sd_card_send_command: Token [17]: 0xff
>> sd_card_send_command: Error: Timeout
>> sd_card_send_command: Error: Response: ff:ff 4d:ff 00:ff 00:ff 00:ff
>> 00:ff 95:ff
>> ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:[ff]
>> sd_card_stop_multiple_block_read: Ok: Write stop transfer token
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x01
>> sd_card_driver_init: Ok: Send: SD_CARD_CMD_GO_IDLE_STATE
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x01
>> sd_card_driver_init: Ok: Send: SD_CARD_CMD_APP_CMD
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x01
>> sd_card_driver_init: Ok: Send: SD_CARD_ACMD_SD_SEND_OP_COND
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x01
>> sd_card_driver_init: Ok: Send: SD_CARD_CMD_APP_CMD
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x01
>> sd_card_driver_init: Ok: Send: SD_CARD_ACMD_SD_SEND_OP_COND
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x01
>> sd_card_driver_init: Ok: Send: SD_CARD_CMD_APP_CMD
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0x00
>> sd_card_driver_init: Ok: Send: SD_CARD_ACMD_SD_SEND_OP_COND
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>> sd_card_send_command: Token [08]: 0xff
>> sd_card_send_command: Token [09]: 0x00
>> sd_card_driver_init: Ok: Send: SD_CARD_CMD_SEND_CID
>> sd_card_read: Search from 10 to 17
>> sd_card_read: Token [10]: 0xff
>> sd_card_read: Token [11]: 0xfe
>> sd_card_read: Ok: Read data
>> sd_card_read: Ok: Read CRC 16
>> sd_card_driver_init: Ok: Read: SD_CARD_CMD_SEND_CID
>> sd_card_driver_init: *** Card Identification ***
>> sd_card_driver_init: Manufacturer ID : 3
>> sd_card_driver_init: OEM/Application ID : 21316
>> sd_card_driver_init: Product name : SD01G€
>> sd_card_driver_init: Product revision : 0
>> sd_card_driver_init: Product serial number : 2696421888
>> sd_card_driver_init: Manufacturing date : 136
>> sd_card_driver_init: 7-bit CRC checksum : 27
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0x7f
>> sd_card_send_command: Error: Command error [07]: 0x7f
>> sd_card_send_command: Error: Response: ff:ff 49:ff 00:ff 00:ff 00:ff
>> 00:ff 95:82
>> ff:[7f] ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff ff:ff
>> RSG: rv=-27
>> sd_card_driver_init: Ok: Send: SD_CARD_CMD_SEND_CSD
>> sd_card_read: Search from 8 to 17
>> sd_card_read: Token [08]: 0xff
>> sd_card_read: Token [09]: 0xff
>> sd_card_read: Token [10]: 0xff
>> sd_card_read: Token [11]: 0xff
>> sd_card_read: Token [12]: 0xff
>> sd_card_read: Token [13]: 0xff
>> sd_card_read: Token [14]: 0xff
>> sd_card_read: Token [15]: 0xff
>> sd_card_read: Token [16]: 0xff
>> sd_card_read: Error: Timeout
>> RSG: rv=-27
>> sd_card_driver_init: Ok: Read: SD_CARD_CMD_SEND_CSD
>> sd_card_driver_init: *** Card Specific Data ***
>> sd_card_driver_init: CSD structure : 0
>> sd_card_driver_init: Spec version : 0
>> sd_card_driver_init: Access time [ns] : 4500
>> sd_card_driver_init: Max access time [N] : 7053
>> sd_card_driver_init: Max read block size [B] : 1
>> sd_card_driver_init: Max write block size [B] : 1
>> sd_card_driver_init: Block size [B] : 1
>> sd_card_driver_init: Block number : 10488
>> sd_card_driver_init: Capacity [B] : 10488
>> sd_card_driver_init: Max transfer speed [b/s] : 450000000
>> sd_card_send_command: Ok: Wait
>> virtex_spi_ioctl
>> sd_card_send_command: Ok: Write command and read response
>> sd_card_send_command: Token [07]: 0xff
>>
>>
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>>
>
>
> - --
>
> - --------------------------------------------
> Embedded Brains GmbH
> Thomas Doerfler Obere Lagerstrasse 30
> D-82178 Puchheim Germany
> email: Thomas.Doerfler at embedded-brains.de
> Phone: +49-89-18908079-2
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