drivers/sdcard: Port the SDCard driver to new machine API.
With backwards compatibility for pyboard.esp8266-idle-ticks
Radomir Dopieralski
Damien George
parent
49406b0ac6
commit
ce1c786297
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@ -4,31 +4,41 @@ Micro Python driver for SD cards using SPI bus.
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Requires an SPI bus and a CS pin. Provides readblocks and writeblocks
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methods so the device can be mounted as a filesystem.
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Example usage:
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Example usage on pyboard:
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import pyb, sdcard, os
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sd = sdcard.SDCard(pyb.SPI(1), pyb.Pin.board.X5)
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pyb.mount(sd, '/sd2')
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os.listdir('/')
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Example usage on ESP8266:
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import machine, sdcard, os
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sd = sdcard.SDCard(machine.SPI(0), machine.Pin(15))
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os.umount()
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os.VfsFat(sd, "")
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os.listdir()
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"""
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import pyb
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import time
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_CMD_TIMEOUT = const(100)
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_R1_IDLE_STATE = const(1 << 0)
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#R1_ERASE_RESET = const(1 << 1)
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_R1_ILLEGAL_COMMAND = const(1 << 2)
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#R1_COM_CRC_ERROR = const(1 << 3)
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#R1_ERASE_SEQUENCE_ERROR = const(1 << 4)
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#R1_ADDRESS_ERROR = const(1 << 5)
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#R1_PARAMETER_ERROR = const(1 << 6)
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_TOKEN_CMD25 = const(0xfc)
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_TOKEN_STOP_TRAN = const(0xfd)
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_TOKEN_DATA = const(0xfe)
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class SDCard:
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CMD_TIMEOUT = const(100)
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R1_IDLE_STATE = const(1 << 0)
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#R1_ERASE_RESET = const(1 << 1)
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R1_ILLEGAL_COMMAND = const(1 << 2)
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#R1_COM_CRC_ERROR = const(1 << 3)
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#R1_ERASE_SEQUENCE_ERROR = const(1 << 4)
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#R1_ADDRESS_ERROR = const(1 << 5)
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#R1_PARAMETER_ERROR = const(1 << 6)
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TOKEN_CMD25 = const(0xfc)
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TOKEN_STOP_TRAN = const(0xfd)
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TOKEN_DATA = const(0xfe)
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def __init__(self, spi, cs):
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self.spi = spi
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self.cs = cs
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@ -42,30 +52,39 @@ class SDCard:
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# initialise the card
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self.init_card()
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def init_spi(self, baudrate):
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try:
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master = self.spi.MASTER
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except AttributeError:
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# on ESP8266
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self.spi.init(baudrate=baudrate, phase=0, polarity=0)
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else:
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# on pyboard
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self.spi.init(master, baudrate=baudrate, phase=0, polarity=0)
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def init_card(self):
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# init CS pin
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self.cs.high()
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self.cs.init(self.cs.OUT_PP)
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self.cs.init(self.cs.OUT, value=1)
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# init SPI bus; use low data rate for initialisation
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self.spi.init(self.spi.MASTER, baudrate=100000, phase=0, polarity=0)
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self.init_spi(100000)
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# clock card at least 100 cycles with cs high
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for i in range(16):
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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# CMD0: init card; should return R1_IDLE_STATE (allow 5 attempts)
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# CMD0: init card; should return _R1_IDLE_STATE (allow 5 attempts)
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for _ in range(5):
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if self.cmd(0, 0, 0x95) == R1_IDLE_STATE:
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if self.cmd(0, 0, 0x95) == _R1_IDLE_STATE:
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break
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else:
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raise OSError("no SD card")
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# CMD8: determine card version
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r = self.cmd(8, 0x01aa, 0x87, 4)
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if r == R1_IDLE_STATE:
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if r == _R1_IDLE_STATE:
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self.init_card_v2()
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elif r == (R1_IDLE_STATE | R1_ILLEGAL_COMMAND):
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elif r == (_R1_IDLE_STATE | _R1_ILLEGAL_COMMAND):
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self.init_card_v1()
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else:
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raise OSError("couldn't determine SD card version")
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@ -86,10 +105,10 @@ class SDCard:
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raise OSError("can't set 512 block size")
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# set to high data rate now that it's initialised
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self.spi.init(self.spi.MASTER, baudrate=1320000, phase=0, polarity=0)
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self.init_spi(1320000)
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def init_card_v1(self):
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for i in range(CMD_TIMEOUT):
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for i in range(_CMD_TIMEOUT):
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self.cmd(55, 0, 0)
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if self.cmd(41, 0, 0) == 0:
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self.cdv = 512
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@ -98,8 +117,8 @@ class SDCard:
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raise OSError("timeout waiting for v1 card")
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def init_card_v2(self):
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for i in range(CMD_TIMEOUT):
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pyb.delay(50)
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for i in range(_CMD_TIMEOUT):
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time.sleep_ms(50)
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self.cmd(58, 0, 0, 4)
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self.cmd(55, 0, 0)
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if self.cmd(41, 0x40000000, 0) == 0:
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@ -120,87 +139,87 @@ class SDCard:
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buf[3] = arg >> 8
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buf[4] = arg
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buf[5] = crc
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self.spi.send(buf)
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self.spi.write(buf)
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# wait for the repsonse (response[7] == 0)
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for i in range(CMD_TIMEOUT):
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response = self.spi.send_recv(0xff)[0]
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for i in range(_CMD_TIMEOUT):
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response = self.spi.read(1, 0xff)[0]
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if not (response & 0x80):
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# this could be a big-endian integer that we are getting here
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for j in range(final):
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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if release:
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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return response
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# timeout
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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return -1
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def cmd_nodata(self, cmd):
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self.spi.send(cmd)
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self.spi.send_recv(0xff) # ignore stuff byte
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for _ in range(CMD_TIMEOUT):
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if self.spi.send_recv(0xff)[0] == 0xff:
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self.spi.write(cmd)
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self.spi.read(1, 0xff) # ignore stuff byte
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for _ in range(_CMD_TIMEOUT):
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if self.spi.read(1, 0xff)[0] == 0xff:
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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return 0 # OK
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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return 1 # timeout
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def readinto(self, buf):
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self.cs.low()
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# read until start byte (0xff)
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while self.spi.send_recv(0xff)[0] != 0xfe:
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while self.spi.read(1, 0xff)[0] != 0xfe:
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pass
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# read data
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mv = self.dummybuf_memoryview[:len(buf)]
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self.spi.send_recv(mv, recv=buf)
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self.spi.write_readinto(mv, buf)
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# read checksum
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self.spi.send(0xff)
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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self.spi.write(b'\xff')
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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def write(self, token, buf):
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self.cs.low()
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# send: start of block, data, checksum
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self.spi.send(token)
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self.spi.send(buf)
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self.spi.send(0xff)
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self.spi.send(0xff)
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self.spi.read(1, token)
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self.spi.write(buf)
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self.spi.write(b'\xff')
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self.spi.write(b'\xff')
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# check the response
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if (self.spi.send_recv(0xff)[0] & 0x1f) != 0x05:
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if (self.spi.read(1, 0xff)[0] & 0x1f) != 0x05:
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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return
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# wait for write to finish
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while self.spi.send_recv(0xff)[0] == 0:
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while self.spi.read(1, 0xff)[0] == 0:
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pass
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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def write_token(self, token):
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self.cs.low()
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self.spi.send(token)
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self.spi.send(0xff)
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self.spi.read(1, token)
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self.spi.write(b'\xff')
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# wait for write to finish
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while self.spi.send_recv(0xff)[0] == 0:
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while self.spi.read(1, 0xff)[0] == 0x00:
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pass
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self.cs.high()
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self.spi.send(0xff)
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self.spi.write(b'\xff')
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def count(self):
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return self.sectors
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@ -224,7 +243,7 @@ class SDCard:
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self.readinto(mv[offset : offset + 512])
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offset += 512
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nblocks -= 1
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return self.cmd_nodata(12)
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return self.cmd_nodata(b'\x0c') # cmd 12
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return 0
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def writeblocks(self, block_num, buf):
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@ -236,7 +255,7 @@ class SDCard:
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return 1
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# send the data
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self.write(TOKEN_DATA, buf)
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self.write(_TOKEN_DATA, buf)
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else:
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# CMD25: set write address for first block
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if self.cmd(25, block_num * self.cdv, 0) != 0:
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@ -245,8 +264,8 @@ class SDCard:
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offset = 0
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mv = memoryview(buf)
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while nblocks:
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self.write(TOKEN_CMD25, mv[offset : offset + 512])
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self.write(_TOKEN_CMD25, mv[offset : offset + 512])
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offset += 512
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nblocks -= 1
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self.write_token(TOKEN_STOP_TRAN)
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self.write_token(_TOKEN_STOP_TRAN)
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return 0
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