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)) + ( \
)
def __init__(self):
+ self.reset()
+
+ def reset(self):
self.state = 'IDLE'
self.ss, self.es = 0, 0
self.ss_bit, self.es_bit = 0, 0
self.blocklen = 0
self.read_buf = []
self.cmd_str = ''
+ self.is_cmd24 = False
+ self.cmd24_start_token_found = False
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
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:
self.read_buf = []
self.state = 'GET RESPONSE R1'
+ def handle_cmd24(self):
+ # CMD24: WRITE_SINGLE_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):
self.state = 'GET RESPONSE R1'
# Bit 7: Always set to 0
putbit(7, ['Bit 7 (always 0)'])
- self.state = 'IDLE'
+ if self.is_cmd24:
+ self.state = 'HANDLE DATA BLOCK CMD24'
def handle_response_r1b(self, res):
# TODO
# TODO
pass
+ 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, ['Data Start Token']])
+ self.cmd24_start_token_found = True
+
+ def handle_data_response(self, miso):
+ miso &= 0x1f
+ if miso & 0x11 != 0x01:
+ # This is not the byte we are waiting for.
+ # Should we return to IDLE here?
+ return
+ self.put(self.miso_bits[7][1], self.miso_bits[5][2], self.out_ann, [134, ['don\'t care']])
+ self.put(self.miso_bits[4][1], self.miso_bits[4][2], self.out_ann, [134, ['0']])
+ if miso == 0x05:
+ self.put(self.miso_bits[3][1], self.miso_bits[1][2], self.out_ann, [134, ['Data accepted']])
+ elif miso == 0x0b:
+ self.put(self.miso_bits[3][1], self.miso_bits[1][2], self.out_ann, [134, ['Data rejected (CRC error)']])
+ elif miso == 0x0d:
+ self.put(self.miso_bits[3][1], self.miso_bits[1][2], self.out_ann, [134, ['Data rejected (write error)']])
+ self.put(self.miso_bits[0][1], self.miso_bits[0][2], self.out_ann, [134, ['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']])
+ self.state = 'IDLE'
+
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 CMD24':
+ self.handle_data_cmd24(mosi)
+ elif self.state == 'DATA RESPONSE':
+ self.handle_data_response(miso)