diff options
Diffstat (limited to 'decoders')
| -rw-r--r-- | decoders/sdcard_spi/pd.py | 57 |
1 files changed, 36 insertions, 21 deletions
diff --git a/decoders/sdcard_spi/pd.py b/decoders/sdcard_spi/pd.py index cf2f487..e5418db 100644 --- a/decoders/sdcard_spi/pd.py +++ b/decoders/sdcard_spi/pd.py @@ -110,6 +110,7 @@ class Decoder(srd.Decoder): self.bit_ss, self.bit_es = 0, 0 self.cmd_ss, self.cmd_es = 0, 0 self.cmd_token = [] + self.cmd_token_bits = [] self.is_acmd = False # Indicates CMD vs. ACMD self.blocklen = 0 self.read_buf = [] @@ -139,6 +140,7 @@ class Decoder(srd.Decoder): self.cmd_ss = self.ss self.cmd_token.append(mosi) + self.cmd_token_bits.append(self.mosi_bits) # TODO: Record MISO too? # All command tokens are 6 bytes long. @@ -156,39 +158,45 @@ class Decoder(srd.Decoder): # TODO self.putx([64, [s + ': %02x %02x %02x %02x %02x %02x' % tuple(t)]]) - # Start bit - self.startbit = (t[0] & (1 << 7)) >> 7 - self.putb([70, ['Start bit: %d' % self.startbit]]) - if self.startbit != 0: + def tb(byte, bit): + return self.cmd_token_bits[5 - byte][7 - bit] + + # Bits[47:47]: Start bit (always 0) + bit, self.bit_ss, self.bit_es = tb(5, 7)[0], tb(5, 7)[1], tb(5, 7)[2] + self.putb([70, ['Start bit: %d' % bit]]) + if bit != 0: # TODO self.putb([1, ['Warning: Start bit != 0']]) - # Transmitter bit - self.transmitterbit = (t[0] & (1 << 6)) >> 6 - self.putb([70, ['Transmitter bit: %d' % self.transmitterbit]]) - if self.transmitterbit != 0: + # Bits[46:46]: Transmitter bit (1 == host) + bit, self.bit_ss, self.bit_es = tb(5, 6)[0], tb(5, 6)[1], tb(5, 6)[2] + self.putb([70, ['Transmitter bit: %d' % bit]]) + if bit != 1: # TODO self.putb([1, ['Warning: Transmitter bit != 1']]) - # Command index - cmd = self.cmd_index = t[0] & 0x3f + # Bits[45:40]: Command index (BCD; valid: 0-63) + cmd = self.cmd_index = t[5] & 0x3f # TODO + self.bit_ss, self.bit_es = tb(5, 5)[1], tb(5, 0)[2] self.putb([70, ['Command: %s%d (%s)' % (s, cmd, cmd_name[cmd])]]) - # Argument + # Bits[39:8]: Argument self.arg = (t[1] << 24) | (t[2] << 16) | (t[3] << 8) | t[4] + self.bit_ss, self.bit_es = tb(4, 7)[1], tb(1, 0)[2] self.putb([70, ['Argument: 0x%04x' % self.arg]]) # TODO: Sanity check on argument? Must be per-cmd? - # CRC + # Bits[7:1]: CRC # TODO: Check CRC. - self.crc = t[5] >> 1 - self.putb([70, ['CRC: 0x%01x' % self.crc]]) - - # End bit - self.endbit = t[5] & (1 << 0) - self.putb([70, ['End bit: %d' % self.endbit]]) - if self.endbit != 1: + crc = t[5] >> 1 + self.bit_ss, self.bit_es = tb(0, 7)[1], tb(0, 1)[2] + self.putb([70, ['CRC: 0x%01x' % crc]]) + + # Bits[0:0]: End bit (always 1) + bit, self.bit_ss, self.bit_es = tb(0, 0)[0], tb(0, 0)[1], tb(0, 0)[2] + self.putb([70, ['End bit: %d' % bit]]) + if bit != 1: # TODO self.putb([1, ['Warning: End bit != 1']]) @@ -201,6 +209,7 @@ class Decoder(srd.Decoder): self.is_acmd = False self.cmd_token = [] + self.cmd_token_bits = [] def handle_cmd0(self, ): # CMD0: GO_IDLE_STATE @@ -383,8 +392,14 @@ class Decoder(srd.Decoder): def decode(self, ss, es, data): ptype, mosi, miso = data - # For now, ignore non-data packets. - if ptype != 'DATA': + # For now, only use DATA and BITS packets. + if ptype not in ('DATA', 'BITS'): + return + + # Store the individual bit values and ss/es numbers. The next packet + # is guaranteed to be a 'DATA' packet belonging to this 'BITS' one. + if ptype == 'BITS': + self.miso_bits, self.mosi_bits = miso, mosi return self.ss, self.es = ss, es |