Цитата(JeezyWonder @ Feb 1 2018, 13:44)

Кто чем может подсказать, что то вообще понять не могу в чем беда то =((
вам бы поискать последнюю спецификацию на SD card, хотя бы открытую часть, там д.б. разрисовано и расписано..
в аттаче картинка от тошибы за 2003 год, может чем-то поможет..
и текст оттуда же:
CODE
6.3. Card Initialize
To initialize the Toshiba SD card, follow the following procedure is recommended example.
1) Supply Voltage for initialization.
Host System can apply the Operating Voltage from initialization to the card.
Apply more than 74 cycles of Dummy-clock to the SD card.
2) Select operation mode (SD mode or SPI mode)
In case of SPI mode operation, host should drive 1 pin (CD/DAT3) of SD Card I/F to “Low” level. Then, issue CMD0.
In case of SD mode operation, host should drive or detect 1 pin of SD Card I/F (Pull up register of 1 pin is pull
up to “High” normally).
Card maintain selected operation mode except re-issue of CMD0 or power on below is SD mode initialization procedure.
3) Send the ACMD41 with Arg = 0 and identify the operating voltage range of the Card.
4) Apply the indicated operating voltage to the card.
Reissue ACMD41 with apply voltage storing and repeat ACMD41 until the busy bit is cleared.
(Bit 31 Busy = 1) If response time out occurred, host can recognize not SD Card.
Note: In MMC-SPI Mode, CMD1 can use in this state.
However, do not use CMD1 in case of SD Mode.
5) Issue the CMD2 and get the Card ID (CID).
Issue the CMD3 and get the RCA. (RCA value is randomly changed by access, not equal zero)
6) Issue the CMD7 and move to the transfer state.
If necessary, Host may issue the ACMD42 and disabled the pull up resistor for Card detect.
7) Issue the ACMD13 and poll the Card status as SD Memory Card. Check SD_CARD_TYPE value. If significant 8 bits
are “all zero”, that means SD Card. If it is not, stop initialization.
8) Issue CMD7 and move to standby state.
Issue CMD9 and get CSD.
Issue CMD10 and get CID.
9) Back to the Transfer state with CMD7.
Issue ACMD6 and choose the appropriate bus-width.
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