X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=decoders%2Fsdcard_spi%2Fpd.py;h=5bb446ad1aa25f83a9cb1256b278c144948156e6;hb=3f5f3a92889e2f297ee6b94362e587a2994f896b;hp=7c596345b1c1b8c655dab78e10a4748d0a0ee80f;hpb=2ba06442543625adec845a38b7b0fbb776fcce7b;p=libsigrokdecode.git diff --git a/decoders/sdcard_spi/pd.py b/decoders/sdcard_spi/pd.py index 7c59634..5bb446a 100644 --- a/decoders/sdcard_spi/pd.py +++ b/decoders/sdcard_spi/pd.py @@ -28,7 +28,8 @@ class Decoder(srd.Decoder): 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)) + ( \ @@ -41,8 +42,8 @@ class Decoder(srd.Decoder): ('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): @@ -53,12 +54,18 @@ class Decoder(srd.Decoder): 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) @@ -144,14 +151,13 @@ class Decoder(srd.Decoder): # 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: @@ -212,15 +218,13 @@ class Decoder(srd.Decoder): 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): @@ -327,7 +331,10 @@ class Decoder(srd.Decoder): # 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 @@ -349,6 +356,113 @@ class Decoder(srd.Decoder): # 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 @@ -388,10 +502,18 @@ class Decoder(srd.Decoder): # 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)