Ivan Grokhotkov 002f38fa8f Merge branch 'feature/sdspi_driver' into 'master'
SD SPI mode driver

This MR adds functionality to support SD cards connected via SPI interface.
Additionally, two bugs are fixed:
- Definition of `SPI_TRANS_MODE_DIOQIO_ADDR` in spi_master driver
- SD card probing frequency was 4000kHz instead of 400kHz as required by the standard

See merge request !727
2017-07-26 13:51:37 +08:00
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