Commit Graph

6 Commits

Author SHA1 Message Date
Ivan Grokhotkov
c6829fa5b8 sdmmc: improve error handling during SPI mode init
- In SPI mode, the card will respond to the initial SDIO reset (done
using CMD52) with “invalid command” error. Handle this correctly.

- sdmmc_card_init had a hack where GO_IDLE_STATE (CMD0) command was
sent twice. Add explanation why this is done, and don’t expect
correct response from the card on first CMD0.

- improve logs printed at debug level by adding CMD index
2018-04-11 11:11:17 +08:00
Ivan Grokhotkov
4a2489b99a sdspi: fix compatibility issue in multi block read
SDSPI driver optimized polling of the response tokens by requesting
two extra bytes on top of the block size (512) and CRC (2), and
checking whether these bytes contained the data response token or
not. In case the token was there, further polling would not need to
happen, thereby reducing latency between two consecutive blocks
transferred. However this caused compatibility issues when these two
extra bytes were sent after reading the final block. When
STOP_TRANSMISSION command was sent, these extra two bytes were
treated as part of the command, causing an invalid command error.

This fixes the logic by only requesting extra two bytes if the block
being read is not the final block. In addition to that, more strict
error checking is implemented for command response tokens.
2018-03-30 18:49:42 +08:00
Ivan Grokhotkov
229f67b816 sdspi: handle delayed R1 responses for data read commands 2018-03-30 18:49:42 +08:00
Ivan Grokhotkov
269486ca4d sdspi: use response timeout passed from upper layer
Previously SDSPI host driver would rely on retry count when waiting for
the card to read or write data. This caused different timeout times
depending on CPU frequency and card clock frequency. In practice, card
performance does not depend on these two factors.
This change uses timeout_ms field of sdmmc_command_t introduced
previously for SDMMC host.

Fixes https://esp32.com/viewtopic.php?f=2&t=3440&p=16037 and similar
issues related to SDSPI timeouts.
2017-12-11 11:07:08 +08:00
michael
1b91cb7be0 fix(sdspi): fix issues causing the sdspi driver to work low efficiently with DMA. 2017-09-19 19:00:47 +08:00
Dmitry Yakovlev
e5bb45f381 driver: SD protocol driver for SPI peripheral 2017-07-20 13:43:07 +08:00