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drivers/sdcard: Allow setting the final SPI baudrate. 

This baudrate is supplied in the constructor. The default is 1320000 as
before.

Example:

    sd = sdcard.SDCard(spi, cs, baudrate=20_000_000)
This commit is contained in:
robert-hh 2022-02-15 18:02:09 +01:00 committed by Damien George
parent 465b74e78d
commit 9c05f3aa1d
1 changed files with 5 additions and 4 deletions
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9
drivers/sdcard/sdcard.py
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@ -39,7 +39,7 @@ _TOKEN_DATA = const(0xFE)
class SDCard: class SDCard:
def __init__(self, spi, cs): def __init__(self, spi, cs, baudrate=1320000):
self.spi = spi self.spi = spi
self.cs = cs self.cs = cs
@ -51,7 +51,7 @@ class SDCard:
self.dummybuf_memoryview = memoryview(self.dummybuf) self.dummybuf_memoryview = memoryview(self.dummybuf)
# initialise the card # initialise the card
self.init_card() self.init_card(baudrate)
def init_spi(self, baudrate): def init_spi(self, baudrate):
try: try:
@ -63,7 +63,8 @@ class SDCard:
# on pyboard # on pyboard
self.spi.init(master, baudrate=baudrate, phase=0, polarity=0) self.spi.init(master, baudrate=baudrate, phase=0, polarity=0)
def init_card(self): def init_card(self, baudrate):
# init CS pin # init CS pin
self.cs.init(self.cs.OUT, value=1) self.cs.init(self.cs.OUT, value=1)
@ -111,7 +112,7 @@ class SDCard:
raise OSError("can't set 512 block size") raise OSError("can't set 512 block size")
# set to high data rate now that it's initialised # set to high data rate now that it's initialised
self.init_spi(1320000) self.init_spi(baudrate)
def init_card_v1(self): def init_card_v1(self):
for i in range(_CMD_TIMEOUT): for i in range(_CMD_TIMEOUT):