desc = 'Secure Digital card (SPI mode) low-level protocol.'
license = 'gplv2+'
inputs = ['spi']
- outputs = ['sdcard_spi']
+ outputs = []
+ tags = ['Memory']
annotations = \
tuple(('cmd%d' % i, 'CMD%d' % i) for i in range(64)) + \
tuple(('acmd%d' % i, 'ACMD%d' % i) for i in range(64)) + ( \
('bit-warnings', 'Bit warnings'),
)
annotation_rows = (
- ('bits', 'Bits', (134, 135)),
- ('cmd-reply', 'Commands/replies', tuple(range(134))),
+ ('bits', 'Bits', (133, 134)),
+ ('cmd-reply', 'Commands/replies', tuple(range(133))),
)
def __init__(self):
self.ss, self.es = 0, 0
self.ss_bit, self.es_bit = 0, 0
self.ss_cmd, self.es_cmd = 0, 0
+ self.ss_busy, self.es_busy = 0, 0
self.cmd_token = []
self.cmd_token_bits = []
self.is_acmd = False # Indicates CMD vs. ACMD
self.blocklen = 0
self.read_buf = []
self.cmd_str = ''
+ self.is_cmd24 = False
+ self.cmd24_start_token_found = False
+ self.is_cmd17 = False
+ self.cmd17_start_token_found = False
+ self.busy_first_byte = False
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
# Bits[0:0]: End bit (always 1)
bit, self.ss_bit, self.es_bit = tb(0, 0)[0], tb(0, 0)[1], tb(0, 0)[2]
- self.putb([134, ['End bit: %d' % bit]])
if bit == 1:
self.putb([134, ['End bit: %d' % bit]])
else:
self.putb([135, ['End bit: %d (Warning: Must be 1!)' % bit]])
# Handle command.
- if cmd in (0, 1, 9, 16, 17, 41, 49, 55, 59):
+ if cmd in (0, 1, 9, 16, 17, 24, 41, 49, 55, 59):
self.state = 'HANDLE CMD%d' % cmd
self.cmd_str = '%s%d (%s)' % (s, cmd, self.cmd_name(cmd))
else:
def handle_cmd17(self):
# CMD17: READ_SINGLE_BLOCK
self.putc(17, 'Read a block from address 0x%04x' % self.arg)
- if len(self.read_buf) == 0:
- self.ss_cmd = self.ss
- self.read_buf.append(self.miso)
- if len(self.read_buf) < self.blocklen + 2: # FIXME
- return
- self.es_cmd = self.es
- self.read_buf = self.read_buf[2:] # FIXME
- self.putx([17, ['Block data: %s' % self.read_buf]])
- self.read_buf = []
+ self.is_cmd17 = True
+ self.state = 'GET RESPONSE R1'
+
+ def handle_cmd24(self):
+ # CMD24: WRITE_BLOCK
+ self.putc(24, 'Write a block to address 0x%04x' % self.arg)
+ self.is_cmd24 = True
self.state = 'GET RESPONSE R1'
def handle_cmd49(self):
# Bit 7: Always set to 0
putbit(7, ['Bit 7 (always 0)'])
- self.state = 'IDLE'
+ if self.is_cmd17:
+ self.state = 'HANDLE DATA BLOCK CMD17'
+ if self.is_cmd24:
+ self.state = 'HANDLE DATA BLOCK CMD24'
def handle_response_r1b(self, res):
# TODO
# TODO
pass
+ def handle_data_cmd17(self, miso):
+ # CMD17 returns one byte R1, then some bytes 0xff, then a Start Block
+ # (single byte 0xfe), then self.blocklen bytes of data, then always
+ # 2 bytes of CRC.
+ if self.cmd17_start_token_found:
+ if len(self.read_buf) == 0:
+ self.ss_data = self.ss
+ if not self.blocklen:
+ # Assume a fixed block size when inspection of the previous
+ # traffic did not provide the respective parameter value.
+ # TODO: Make the default block size a PD option?
+ self.blocklen = 512
+ self.read_buf.append(miso)
+ # Wait until block transfer completed.
+ if len(self.read_buf) < self.blocklen:
+ return
+ if len(self.read_buf) == self.blocklen:
+ self.es_data = self.es
+ self.put(self.ss_data, self.es_data, self.out_ann, [17, ['Block data: %s' % self.read_buf]])
+ elif len(self.read_buf) == (self.blocklen + 1):
+ self.ss_crc = self.ss
+ elif len(self.read_buf) == (self.blocklen + 2):
+ self.es_crc = self.es
+ # TODO: Check CRC.
+ self.put(self.ss_crc, self.es_crc, self.out_ann, [17, ['CRC']])
+ self.state = 'IDLE'
+ elif miso == 0xfe:
+ self.put(self.ss, self.es, self.out_ann, [17, ['Start Block']])
+ self.cmd17_start_token_found = True
+
+ def handle_data_cmd24(self, mosi):
+ if self.cmd24_start_token_found:
+ if len(self.read_buf) == 0:
+ self.ss_data = self.ss
+ if not self.blocklen:
+ # Assume a fixed block size when inspection of the
+ # previous traffic did not provide the respective
+ # parameter value.
+ # TODO Make the default block size a user adjustable option?
+ self.blocklen = 512
+ self.read_buf.append(mosi)
+ # Wait until block transfer completed.
+ if len(self.read_buf) < self.blocklen:
+ return
+ self.es_data = self.es
+ self.put(self.ss_data, self.es_data, self.out_ann, [24, ['Block data: %s' % self.read_buf]])
+ self.read_buf = []
+ self.state = 'DATA RESPONSE'
+ elif mosi == 0xfe:
+ self.put(self.ss, self.es, self.out_ann, [24, ['Start Block']])
+ self.cmd24_start_token_found = True
+
+ def handle_data_response(self, miso):
+ # Data Response token (1 byte).
+ #
+ # Format:
+ # - Bits[7:5]: Don't care.
+ # - Bits[4:4]: Always 0.
+ # - Bits[3:1]: Status.
+ # - 010: Data accepted.
+ # - 101: Data rejected due to a CRC error.
+ # - 110: Data rejected due to a write error.
+ # - Bits[0:0]: Always 1.
+ miso &= 0x1f
+ if miso & 0x11 != 0x01:
+ # This is not the byte we are waiting for.
+ # Should we return to IDLE here?
+ return
+ m = self.miso_bits
+ self.put(m[7][1], m[5][2], self.out_ann, [134, ['Don\'t care']])
+ self.put(m[4][1], m[4][2], self.out_ann, [134, ['Always 0']])
+ if miso == 0x05:
+ self.put(m[3][1], m[1][2], self.out_ann, [134, ['Data accepted']])
+ elif miso == 0x0b:
+ self.put(m[3][1], m[1][2], self.out_ann, [134, ['Data rejected (CRC error)']])
+ elif miso == 0x0d:
+ self.put(m[3][1], m[1][2], self.out_ann, [134, ['Data rejected (write error)']])
+ self.put(m[0][1], m[0][2], self.out_ann, [134, ['Always 1']])
+ ann_class = None
+ if self.is_cmd24:
+ ann_class = 24
+ if ann_class is not None:
+ self.put(self.ss, self.es, self.out_ann, [ann_class, ['Data Response']])
+ if self.is_cmd24:
+ # We just send a block of data to be written to the card,
+ # this takes some time.
+ self.state = 'WAIT WHILE CARD BUSY'
+ self.busy_first_byte = True
+ else:
+ self.state = 'IDLE'
+
+ def wait_while_busy(self, miso):
+ if miso != 0x00:
+ ann_class = None
+ if self.is_cmd24:
+ ann_class = 24
+ if ann_class is not None:
+ self.put(self.ss_busy, self.es_busy, self.out_ann, [24, ['Card is busy']])
+ self.state = 'IDLE'
+ return
+ else:
+ if self.busy_first_byte:
+ self.ss_busy = self.ss
+ self.busy_first_byte = False
+ else:
+ self.es_busy = self.es
+
def decode(self, ss, es, data):
ptype, mosi, miso = data
# Ignore stray 0xff bytes, some devices seem to send those!?
if miso == 0xff: # TODO?
return
-
# Call the respective handler method for the response.
+ # Assume return to IDLE state, but allow response handlers
+ # to advance to some other state when applicable.
s = 'handle_response_%s' % self.state[13:].lower()
handle_response = getattr(self, s)
- handle_response(miso)
-
self.state = 'IDLE'
+ handle_response(miso)
+ elif self.state == 'HANDLE DATA BLOCK CMD17':
+ self.handle_data_cmd17(miso)
+ elif self.state == 'HANDLE DATA BLOCK CMD24':
+ self.handle_data_cmd24(mosi)
+ elif self.state == 'DATA RESPONSE':
+ self.handle_data_response(miso)
+ elif self.state == 'WAIT WHILE CARD BUSY':
+ self.wait_while_busy(miso)
projects / libsigrokdecode.git / blobdiff