chenjianqiang 9edc9674bc bugfix(flash): improve spi cs timing settings for flash
cs setup time is recomemded to be 1.5T, and cs hold time is recommended to be 2.5T.
(cs_setup = 1, cs_setup_time = 0; cs_hold = 1, cs_hold_time = 1)
2019-07-15 14:44:28 +08:00
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