diff options
Diffstat (limited to 'decoders/mx25lxx05d/mx25lxx05d.py')
| -rw-r--r-- | decoders/mx25lxx05d/mx25lxx05d.py | 74 |
1 files changed, 68 insertions, 6 deletions
diff --git a/decoders/mx25lxx05d/mx25lxx05d.py b/decoders/mx25lxx05d/mx25lxx05d.py index eb0e798..cb54728 100644 --- a/decoders/mx25lxx05d/mx25lxx05d.py +++ b/decoders/mx25lxx05d/mx25lxx05d.py @@ -115,6 +115,8 @@ class Decoder(srd.Decoder): def __init__(self, **kwargs): self.state = IDLE self.cmdstate = 1 # TODO + self.addr = 0 + self.data = [] def start(self, metadata): # self.out_proto = self.add(srd.OUTPUT_PROTO, 'mx25lxx05d') @@ -225,19 +227,77 @@ class Decoder(srd.Decoder): self.cmdstate += 1 def handle_rdsr(self, mosi, miso): - self.putx([0, ['Command: %s (0x%02x)' % (cmds[self.cmd], miso)]]) - self.state = IDLE + # Read status register: Master asserts CS#, sends RDSR command, + # reads status register byte. If CS# is kept asserted, the status + # register can be read continuously / multiple times in a row. + # When done, the master de-asserts CS# again. + if self.cmdstate == 1: + # Byte 1: Master sends command ID. + self.putx([0, ['Command: %s' % cmds[self.cmd]]]) + elif self.cmdstate >= 2: + # Bytes 2-x: Slave sends status register as long as master clocks. + if self.cmdstate <= 3: # TODO: While CS# asserted. + self.putx([0, ['Status register: 0x%02x' % miso]]) + # TODO: Decode status register bits. + + if self.cmdstate == 3: # TODO: If CS# got de-asserted. + self.state = IDLE + return + + self.cmdstate += 1 + + def handle_pp(self, mosi, miso): + # Page program: Master asserts CS#, sends PP command, sends 3-byte + # page address, sends >= 1 data bytes, de-asserts CS#. + if self.cmdstate == 1: + # Byte 1: Master sends command ID. + self.putx([0, ['Command: %s' % cmds[self.cmd]]]) + elif self.cmdstate in (2, 3, 4): + # Bytes 2/3/4: Master sends page address (24bits, MSB-first). + self.addr |= (mosi << ((4 - self.cmdstate) * 8)) + # self.putx([0, ['Page address, byte %d: 0x%02x' % \ + # (4 - self.cmdstate, mosi)]]) + if self.cmdstate == 4: + self.putx([0, ['Page address: 0x%06x' % self.addr]]) + self.addr = 0 + elif self.cmdstate >= 5: + # Bytes 5-x: Master sends data bytes (until CS# de-asserted). + # TODO: For now we hardcode 256 bytes per page / PP command. + if self.cmdstate <= 256 + 4: # TODO: While CS# asserted. + self.data.append(mosi) + # self.putx([0, ['New data byte: 0x%02x' % mosi]]) + + if self.cmdstate == 256 + 4: # TODO: If CS# got de-asserted. + # s = ', '.join(map(hex, self.data)) + s = ''.join(map(chr, self.data)) + self.putx([0, ['Page data: %s' % s]]) + self.data = [] + self.state = IDLE + return + + self.cmdstate += 1 def decode(self, ss, es, data): ptype, mosi, miso = data + # if ptype == 'DATA': + # s = 'MOSI: 0x%02x, MISO: 0x%02x' % (mosi, miso) + # self.put(0, 0, self.out_ann, [0, [s]]) + # pass + + # if ptype == 'CS-CHANGE': + # if mosi == 1 and miso == 0: + # self.put(0, 0, self.out_ann, [0, ['Asserting CS#']]) + # elif mosi == 0 and miso == 1: + # self.put(0, 0, self.out_ann, [0, ['De-asserting CS#']]) + # return + if ptype != 'DATA': return cmd = mosi - self.ss = ss - self.es = es + self.ss, self.es = ss, es # If we encountered a known chip command, enter the resp. state. if self.state == IDLE: @@ -256,10 +316,12 @@ class Decoder(srd.Decoder): self.handle_se(mosi, miso) elif self.state == CMD_RDID: self.handle_rdid(mosi, miso) - if self.state == CMD_REMS: + elif self.state == CMD_REMS: self.handle_rems(mosi, miso) - if self.state == CMD_RDSR: + elif self.state == CMD_RDSR: self.handle_rdsr(mosi, miso) + elif self.state == CMD_PP: + self.handle_pp(mosi, miso) else: self.put(0, 0, self.out_ann, [0, ['Unknown command: 0x%02x' % cmd]]) self.state = IDLE |