diff options
Diffstat (limited to 'decoders')
| -rw-r--r-- | decoders/Makefile.am | 1 | ||||
| -rw-r--r-- | decoders/sdcard_spi/Makefile.am | 26 | ||||
| -rw-r--r-- | decoders/sdcard_spi/__init__.py | 74 | ||||
| -rw-r--r-- | decoders/sdcard_spi/pd.py | 400 |
4 files changed, 501 insertions, 0 deletions
diff --git a/decoders/Makefile.am b/decoders/Makefile.am index f8e7f61..d5ebd7d 100644 --- a/decoders/Makefile.am +++ b/decoders/Makefile.am @@ -37,6 +37,7 @@ SUBDIRS = \ nunchuk \ pan1321 \ rtc8564 \ + sdcard_spi \ spi \ transitioncounter \ uart \ diff --git a/decoders/sdcard_spi/Makefile.am b/decoders/sdcard_spi/Makefile.am new file mode 100644 index 0000000..f869a8f --- /dev/null +++ b/decoders/sdcard_spi/Makefile.am @@ -0,0 +1,26 @@ +## +## This file is part of the sigrok project. +## +## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 2 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, write to the Free Software +## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +## + +pkgdatadir = $(DECODERS_DIR)/sdcard_spi + +dist_pkgdata_DATA = __init__.py pd.py + +CLEANFILES = *.pyc + diff --git a/decoders/sdcard_spi/__init__.py b/decoders/sdcard_spi/__init__.py new file mode 100644 index 0000000..3b85f58 --- /dev/null +++ b/decoders/sdcard_spi/__init__.py @@ -0,0 +1,74 @@ +## +## This file is part of the sigrok project. +## +## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 2 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, write to the Free Software +## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +## + +''' +SD card (SPI mode) low-level protocol decoder. + +TODO: Description. + +Most SD cards can be accessed via two different protocols/modes: SD mode +or SPI mode. + +All SD cards are in SD mode upon powerup. They can be switched to SPI mode +using a special method involving CMD0 (see spec). Once in SPI mode, the mode +can no longer be changed without a power-cycle of the card. + +SPI mode properties (differences to SD mode): + * The 'sdcard_spi' PD stacks on top of the 'spi' PD. This is not possible + for the 'sdcard_sd' PD, as that protocol is not SPI related at all. + Hence 'sdcard_spi' and 'sdcard_sd' are two separate PDs. + * The state machines for SPI mode and SD mode are different. + * In SPI mode, data transfers are byte-oriented (commands/data are multiples + of 8 bits, with the CS# pin asserted respectively), unlike SD mode where + commands/data are bit-oriented with parallel transmission of 1 or 4 bits. + * While the SPI mode command set has some commands in common with the + SD mode command set, they are not the same and also not a subset/superset. + Some commands are only available in SD mode (e.g. CMD2), some only + in SPI mode (e.g. CMD1). + * Response types of commands also differ between SD mode and SPI mode. + E.g. CMD9 has an R2 response in SD mode, but R1 in SPI mode. + * The commands and functions in SD mode defined after version 2.00 of the + spec are NOT supported in SPI mode. + * SPI mode: The selected SD card ALWAYS responds to commands (unlike SD mode). + * Upon data retrieval problems (read operations) the card will respond with + an error response (and no data), as opposed to a timeout in SD mode. + * SPI mode: For every data block sent to the card (write operations) the host + gets a data response token from the card. + * SDSC: A data block can be max. one card write block, min. 1 byte. + * SDHC/SDXC: Block length is fixed to 512. The block length set by CMD16 + is only used for CDM42 (not for memory data transfers). Thus, partial + read/write operations are disabled in SPI mode. + * SPI mode: Write protected commands (CMD28, CMD29, CMD30) are not supported. + * The SD mode state machine is NOT used. All commands that are supported + in SPI mode are always available. + * Per default the card is in CRC OFF mode. Exception: CMD0 (which is used to + switch to SPI mode) needs a valid CRC. + * The APP_CMD status bit is not available in SPI mode. + * TODO: Switch function command differences. + * In SPI mode cards cannot guarantee their speed class (the host should + assume class 0, no matter what the card indicates). + * The RCA register is not accessible in SPI mode. + +Details: +TODO +''' + +from .pd import * + diff --git a/decoders/sdcard_spi/pd.py b/decoders/sdcard_spi/pd.py new file mode 100644 index 0000000..997a556 --- /dev/null +++ b/decoders/sdcard_spi/pd.py @@ -0,0 +1,400 @@ +## +## This file is part of the sigrok project. +## +## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; either version 2 of the License, or +## (at your option) any later version. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, write to the Free Software +## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +## + +# SD card (SPI mode) low-level protocol decoder + +import sigrokdecode as srd + +cmd_name = { + # Normal commands (CMD) + 0: 'GO_IDLE_STATE', + 1: 'SEND_OP_COND', + 6: 'SWITCH_FUNC', + 8: 'SEND_IF_COND', + 9: 'SEND_CSD', + 10: 'SEND_CID', + 12: 'STOP_TRANSMISSION', + 13: 'SEND_STATUS', + 16: 'SET_BLOCKLEN', + 17: 'READ_SINGLE_BLOCK', + 18: 'READ_MULTIPLE_BLOCK', + 24: 'WRITE_BLOCK', + 25: 'WRITE_MULTIPLE_BLOCK', + 27: 'PROGRAM_CSD', + 28: 'SET_WRITE_PROT', + 29: 'CLR_WRITE_PROT', + 30: 'SEND_WRITE_PROT', + 32: 'ERASE_WR_BLK_START_ADDR', + 33: 'ERASE_WR_BLK_END_ADDR', + 38: 'ERASE', + 42: 'LOCK_UNLOCK', + 55: 'APP_CMD', + 56: 'GEN_CMD', + 58: 'READ_OCR', + 59: 'CRC_ON_OFF', + # CMD60-63: Reserved for manufacturer + + # Application-specific commands (ACMD) + 13: 'SD_STATUS', + 18: 'Reserved for SD security applications', + 22: 'SEND_NUM_WR_BLOCKS', + 23: 'SET_WR_BLK_ERASE_COUNT', + 25: 'Reserved for SD security applications', + 26: 'Reserved for SD security applications', + 38: 'Reserved for SD security applications', + 41: 'SD_SEND_OP_COND', + 42: 'SET_CLR_CARD_DETECT', + 43: 'Reserved for SD security applications', + 44: 'Reserved for SD security applications', + 45: 'Reserved for SD security applications', + 46: 'Reserved for SD security applications', + 47: 'Reserved for SD security applications', + 48: 'Reserved for SD security applications', + 49: 'Reserved for SD security applications', + 51: 'SEND_SCR', +} + +class Decoder(srd.Decoder): + api_version = 1 + id = 'sdcard_spi' + name = 'SD card (SPI mode)' + longname = 'Secure Digital card (SPI mode)' + desc = 'Secure Digital card (SPI mode) low-level protocol.' + license = 'gplv2+' + inputs = ['spi'] + outputs = ['sdcard_spi'] + probes = [] + optional_probes = [] + options = {} + annotations = [ + ['Text', 'Human-readable text'], + ['Warnings', 'Human-readable warnings'], + ] + + def __init__(self, **kwargs): + self.state = 'IDLE' + self.samplenum = 0 + self.cmd_ss, self.cmd_es = 0, 0 + self.cmd_token = [] + self.is_acmd = False # Indicates CMD vs. ACMD + self.blocklen = 0 + self.read_buf = [] + + def start(self, metadata): + # self.out_proto = self.add(srd.OUTPUT_PROTO, 'sdcard_spi') + self.out_ann = self.add(srd.OUTPUT_ANN, 'sdcard_spi') + + def report(self): + pass + + def putx(self, data): + self.put(self.cmd_ss, self.cmd_es, self.out_ann, data) + + def handle_command_token(self, mosi, miso): + # Command tokens (6 bytes) are sent (MSB-first) by the host. + # + # Format: + # - CMD[47:47]: Start bit (always 0) + # - CMD[46:46]: Transmitter bit (1 == host) + # - CMD[45:40]: Command index (BCD; valid: 0-63) + # - CMD[39:08]: Argument + # - CMD[07:01]: CRC7 + # - CMD[00:00]: End bit (always 1) + + self.cmd_token.append(mosi) + # TODO: Record MISO too? + + # All command tokens are 6 bytes long. + if len(self.cmd_token) < 6: + return + + # Received all 6 bytes of the command token. Now decode it. + + t = self.cmd_token + + # CMD or ACMD? + s = 'ACMD' if self.is_acmd else 'CMD' + # TODO + self.put(0, 0, self.out_ann, + [0, [s + ': %02x %02x %02x %02x %02x %02x' % tuple(t)]]) + + # Start bit + self.startbit = (t[0] & (1 << 7)) >> 7 + self.put(0, 0, self.out_ann, + [0, ['Start bit: %d' % self.startbit]]) + if self.startbit != 0: + # TODO + self.put(0, 0, self.out_ann, [1, ['Warning: Start bit != 0']]) + + # Transmitter bit + self.transmitterbit = (t[0] & (1 << 6)) >> 6 + self.put(0, 0, self.out_ann, + [0, ['Transmitter bit: %d' % self.transmitterbit]]) + if self.transmitterbit != 0: + # TODO + self.put(0, 0, self.out_ann, [1, ['Warning: Transmitter bit != 1']]) + + # Command index + cmd = self.cmd_index = t[0] & 0x3f + # TODO + self.put(0, 0, self.out_ann, + [0, ['Command: %s%d (%s)' % (s, cmd, cmd_name[cmd])]]) + + # Argument + self.arg = (t[1] << 24) | (t[2] << 16) | (t[3] << 8) | t[4] + self.put(0, 0, self.out_ann, [0, ['Argument: 0x%04x' % self.arg]]) + # TODO: Sanity check on argument? Must be per-cmd? + + # CRC + # TODO: Check CRC. + self.crc = t[5] >> 1 + self.put(0, 0, self.out_ann, [0, ['CRC: 0x%01x' % self.crc]]) + + # End bit + self.endbit = t[5] & (1 << 0) + self.put(0, 0, self.out_ann, [0, ['End bit: %d' % self.endbit]]) + if self.endbit != 1: + # TODO + self.put(0, 0, self.out_ann, [1, ['Warning: End bit != 1']]) + + # Handle command. + if cmd in (0, 1, 9, 16, 17, 41, 49, 55, 59): + self.state = 'HANDLE CMD%d' % cmd + + # ... + if self.is_acmd and cmd != 55: + self.is_acmd = False + + self.cmd_token = [] + + def handle_cmd0(self, ): + # CMD0: GO_IDLE_STATE + # TODO + self.put(0, 0, self.out_ann, [0, ['CMD0: Card reset / idle state']]) + self.state = 'GET RESPONSE R1' + + def handle_cmd1(self): + # CMD1: SEND_OP_COND + # TODO + hcs = (self.arg & (1 << 30)) >> 30 + self.put(0, 0, self.out_ann, [0, ['HCS bit = %d' % hcs]]) + self.state = 'GET RESPONSE R1' + + def handle_cmd9(self): + # CMD9: SEND_CSD (128 bits / 16 bytes) + self.read_buf.append(self.miso) + # FIXME + ### if len(self.read_buf) < 16: + if len(self.read_buf) < 16 + 4: + return + self.read_buf = self.read_buf[4:] ### TODO: Document or redo. + self.put(0, 0, self.out_ann, [0, ['CSD: %s' % self.read_buf]]) + # TODO: Decode all bits. + self.read_buf = [] + ### self.state = 'GET RESPONSE R1' + self.state = 'IDLE' + + def handle_cmd10(self): + # CMD10: SEND_CID (128 bits / 16 bytes) + self.read_buf.append(self.miso) + if len(self.read_buf) < 16: + return + self.put(0, 0, self.out_ann, [0, ['CID: %s' % self.read_buf]]) + # TODO: Decode all bits. + self.read_buf = [] + self.state = 'GET RESPONSE R1' + + def handle_cmd16(self): + # CMD16: SET_BLOCKLEN + self.blocklen = self.arg # TODO + # TODO: Sanity check on block length. + self.put(0, 0, self.out_ann, [0, ['Block length: %d' % self.blocklen]]) + self.state = 'GET RESPONSE R1' + + def handle_cmd17(self): + # CMD17: READ_SINGLE_BLOCK + self.read_buf.append(self.miso) + if len(self.read_buf) == 1: + self.put(0, 0, self.out_ann, + [0, ['Read block at address: 0x%04x' % self.arg]]) + if len(self.read_buf) < self.blocklen + 2: # FIXME + return + self.read_buf = self.read_buf[2:] # FIXME + self.put(0, 0, self.out_ann, [0, ['Block data: %s' % self.read_buf]]) + self.read_buf = [] + self.state = 'GET RESPONSE R1' + + def handle_cmd41(self): + # ACMD41: SD_SEND_OP_COND + self.state = 'GET RESPONSE R1' + + def handle_cmd49(self): + self.state = 'GET RESPONSE R1' + + def handle_cmd55(self): + # CMD55: APP_CMD + self.is_acmd = True + self.state = 'GET RESPONSE R1' + + def handle_cmd59(self): + # CMD59: CRC_ON_OFF + crc_on_off = self.arg & (1 << 0) + s = 'on' if crc_on_off == 1 else 'off' + self.put(0, 0, self.out_ann, [0, ['SD card CRC option: %s' % s]]) + self.state = 'GET RESPONSE R1' + + def handle_cid_register(self): + # Card Identification (CID) register, 128bits + + cid = self.cid + + # Manufacturer ID: CID[127:120] (8 bits) + mid = cid[15] + + # OEM/Application ID: CID[119:104] (16 bits) + oid = (cid[14] << 8) | cid[13] + + # Product name: CID[103:64] (40 bits) + pnm = 0 + for i in range(12, 8 - 1, -1): + pnm <<= 8 + pnm |= cid[i] + + # Product revision: CID[63:56] (8 bits) + prv = cid[7] + + # Product serial number: CID[55:24] (32 bits) + psn = 0 + for i in range(6, 3 - 1, -1): + psn <<= 8 + psn |= cid[i] + + # RESERVED: CID[23:20] (4 bits) + + # Manufacturing date: CID[19:8] (12 bits) + # TODO + + # CRC7 checksum: CID[7:1] (7 bits) + # TODO + + # Not used, always 1: CID[0:0] (1 bit) + # TODO + + def handle_response_r1(self, res): + # The R1 response token format (1 byte). + # Sent by the card after every command except for SEND_STATUS. + + self.put(0, 0, self.out_ann, [0, ['R1: 0x%02x' % res]]) + + # TODO: Configurable whether all bits are decoded. + + # 'In idle state' bit + s = '' if (res & (1 << 0)) else 'not ' + self.put(0, 0, self.out_ann, [0, ['Card is %sin idle state' % s]]) + + # 'Erase reset' bit + s = '' if (res & (1 << 1)) else 'not ' + self.put(0, 0, self.out_ann, [0, ['Erase sequence %scleared' % s]]) + + # 'Illegal command' bit + s = 'I' if (res & (1 << 2)) else 'No i' + self.put(0, 0, self.out_ann, [0, ['%sllegal command detected' % s]]) + + # 'Communication CRC error' bit + s = 'failed' if (res & (1 << 3)) else 'was successful' + self.put(0, 0, self.out_ann, + [0, ['CRC check of last command %s' % s]]) + + # 'Erase sequence error' bit + s = 'E' if (res & (1 << 4)) else 'No e' + self.put(0, 0, self.out_ann, + [0, ['%srror in the sequence of erase commands' % s]]) + + # 'Address error' bit + s = 'M' if (res & (1 << 4)) else 'No m' + self.put(0, 0, self.out_ann, + [0, ['%sisaligned address used in command' % s]]) + + # 'Parameter error' bit + s = '' if (res & (1 << 4)) else 'not ' + self.put(0, 0, self.out_ann, + [0, ['Command argument %soutside allowed range' % s]]) + + self.state = 'IDLE' + + def handle_response_r1b(self, res): + # TODO + pass + + def handle_response_r2(self, res): + # TODO + pass + + def handle_response_r3(self, res): + # TODO + pass + + # Note: Response token formats R4 and R5 are reserved for SDIO. + + # TODO: R6? + + def handle_response_r7(self, res): + # TODO + pass + + def decode(self, ss, es, data): + ptype, mosi, miso = data + + # For now, ignore non-data packets. + if ptype != 'DATA': + return + + self.put(0, 0, self.out_ann, [0, ['0x%02x 0x%02x' % (mosi, miso)]]) + + # State machine. + if self.state == 'IDLE': + # Ignore stray 0xff bytes, some devices seem to send those!? + if mosi == 0xff: # TODO? + return + self.state = 'GET COMMAND TOKEN' + self.handle_command_token(mosi, miso) + elif self.state == 'GET COMMAND TOKEN': + self.handle_command_token(mosi, miso) + elif self.state.startswith('HANDLE CMD'): + self.miso, self.mosi = miso, mosi + # Call the respective handler method for the command. + s = 'handle_cmd%s' % self.state[10:].lower() + handle_cmd = getattr(self, s) + handle_cmd() + elif self.state.startswith('GET RESPONSE'): + # Ignore stray 0xff bytes, some devices seem to send those!? + if miso == 0xff: # TODO? + return + + # Call the respective handler method for the response. + s = 'handle_response_%s' % self.state[13:].lower() + # self.put(0, 0, self.out_ann, [0, [s]]) # TODO + handle_response = getattr(self, s) + handle_response(miso) + + self.state = 'IDLE' + else: + raise Exception('Invalid state: %s' % self.state) + |