Commit Graph

14 Commits

Author SHA1 Message Date
Ivan Grokhotkov
78fab8a0f9 sdmmc: implement partial DDR support
Works for 3.3V eMMC in 4 line mode.
Not implemented:
- DDR mode for SD cards (UHS-I) also need voltage to be switched to 1.8V.
- 8-line DDR mode for eMMC to be implemented later.
2018-08-30 13:11:54 +08:00
Ivan Grokhotkov
80e47a005d sdmmc host: minor cleanup
Code style, comments
2018-08-30 11:36:28 +08:00
michael
c34672e7dc fix(sdmmc): disable all pulldowns used by sdmmc host 2018-07-06 18:17:51 +08:00
michael
5b37a96ddc feature(sdio): allow to enable internal pullups of the SDIO host and slave as a debug feature
NOTE: the internal pullups are not totally reliable, please do add external pullups on your bus.
2018-06-14 12:04:22 +08:00
Ivan Grokhotkov
85ab4fc83e sdmmc host: add handling of CD and WP pins
Previous version of the code only connected CD and WP to the
peripheral, in fact the hardware does not use the values of these
signals automatically. This adds code to read CD and WP values when
command is executed and return errors if card is not present, or
write command is executed when WP signal is active.
2018-04-24 19:08:44 +08:00
Ivan Grokhotkov
ee600784c5 sdmmc: add SDIO support
- Add SDIO support at protocol layer (probing, data transfer, interrupts)
- Add SDIO interrupts support in SDMMC host
- Add test (communicate with ESP32 in SDIO download mode)
2018-04-11 11:07:13 +08:00
Ivan Grokhotkov
f02cff13cc sdmmc: set highest possible host clock divider
SDMMC host suffers from an issue that it outputs data near the rising
edge of the card clock, which is the edge used by the card to sample
data. If sampling time constraint is not satisfied, card may read data
after the transition.

The phases of output/input data can, in fact, be adjusted. However this
adjustment happens in the clock generation block outside of the host.
So the maximum phase change which can be created this way is equal to
half of the host clock period. So if the host clock is set to the lowest
possible frequency (for the given card frequency), then the phase offset
(and hence the hold time) will be the highest. This change modifies the
logic used to determine clock dividers accordingly.

sdmmc host: set correct dout phase and print correct frequency
2018-04-11 11:06:50 +08:00
Michael (XIAO Xufeng)
e14e1508cb fix(sdmmc_host): fix the issue when slot and host flag are not compatible. 2018-02-07 12:05:05 +08:00
Michael (XIAO Xufeng)
8abbb17401 feat(sdmmc_host): force pull-up DAT3 for SD 4-bit mode so that slave will not fall into SPI mode. 2018-02-07 12:05:05 +08:00
Ivan Grokhotkov
b38186dc43 sdmmc: use periph_ctrl to enable peripheral when initializing the host 2017-09-04 22:43:52 +08:00
Ivan Grokhotkov
49848eaed5 sdmmc: handle card removal when CD is not used
When SD card is removed during transaction, SDMMC peripheral can report
a range of errors, such as timeouts, CRC errors, start/end bit errors.
Under normal conditions (card is inserted), SDMMC peripheral also generates
command done or data done interrupts. When the card is removed, such
interrupts may not be always generated.

This change fixes handling of timeout interrupts and SBE interrupts.
It also adds a one second timeout into the event processing loop. This
timeout allows applications to recover in cases when the SDMMC peripheral
doesn’t generate command/data done event on card removal.
2017-04-19 12:50:51 +08:00
Angus Gratton
6ee5a1e492 sdmmc: Use slot width as default slot_config width parameter, instead of 4
Ref #361 https://github.com/espressif/esp-idf/pull/361
2017-03-03 14:59:15 +11:00
Daniel Campora
c08a2871e6 sdmmc: Add width field to the slot config.
Therefore if the width is set to 1, you can choose to only
configure the CLK, DAT0 and CMD pins.

Merges #361 https://github.com/espressif/esp-idf/pull/361
2017-03-03 14:59:15 +11:00
Ivan Grokhotkov
edd924f273 sdmmc: add peripheral driver and protocol layer 2017-01-09 04:51:24 +08:00