2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2012-2014 Uwe Hermann <uwe@hermann-uwe.de>
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 2 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
20 import sigrokdecode as srd
24 PE, RSB0, RSB1, RSB2, CE, RFB, RHFB, REFB, \
25 WARN, DEV, = range(10)
27 VENDOR_CODE_ATMEL = 0x1e
29 class Decoder(srd.Decoder):
33 longname = 'AVR In-System Programming'
34 desc = 'Atmel AVR In-System Programming (ISP) protocol.'
38 tags = ['Debug/trace']
40 ('pe', 'Programming enable'),
41 ('rsb0', 'Read signature byte 0'),
42 ('rsb1', 'Read signature byte 1'),
43 ('rsb2', 'Read signature byte 2'),
45 ('rfb', 'Read fuse bits'),
46 ('rhfb', 'Read high fuse bits'),
47 ('refb', 'Read extended fuse bits'),
48 ('warning', 'Warning'),
52 ('commands', 'Commands', (Ann.PE, Ann.RSB0, Ann.RSB1, Ann.RSB2,
53 Ann.CE, Ann.RFB, Ann.RHFB, Ann.REFB,)),
54 ('warnings', 'Warnings', (Ann.WARN,)),
55 ('devs', 'Devices', (Ann.DEV,)),
63 self.mosi_bytes, self.miso_bytes = [], []
64 self.ss_cmd, self.es_cmd = 0, 0
65 self.xx, self.yy, self.zz, self.mm = 0, 0, 0, 0
69 self.out_ann = self.register(srd.OUTPUT_ANN)
72 self.put(self.ss_cmd, self.es_cmd, self.out_ann, data)
74 def handle_cmd_programming_enable(self, cmd, ret):
76 # Note: The chip doesn't send any ACK for 'Programming enable'.
77 self.putx([Ann.PE, ['Programming enable']])
79 # Sanity check on reply.
80 if ret[1:4] != [0xac, 0x53, cmd[2]]:
81 self.putx([Ann.WARN, ['Warning: Unexpected bytes in reply!']])
83 def handle_cmd_read_signature_byte_0x00(self, cmd, ret):
84 # Signature byte 0x00: vendor code.
85 self.vendor_code = ret[3]
86 v = vendor_code[self.vendor_code]
87 self.putx([Ann.RSB0, ['Vendor code: 0x%02x (%s)' % (ret[3], v)]])
90 self.xx = cmd[1] # Same as ret[2].
94 # Sanity check on reply.
95 if ret[1] != 0x30 or ret[2] != cmd[1]:
96 self.putx([Ann.WARN, ['Warning: Unexpected bytes in reply!']])
98 # Sanity check for the vendor code.
99 if self.vendor_code != VENDOR_CODE_ATMEL:
100 self.putx([Ann.WARN, ['Warning: Vendor code was not 0x1e (Atmel)!']])
102 def handle_cmd_read_signature_byte_0x01(self, cmd, ret):
103 # Signature byte 0x01: part family and memory size.
104 self.part_fam_flash_size = ret[3]
105 self.putx([Ann.RSB1, ['Part family / memory size: 0x%02x' % ret[3]]])
109 self.ss_device = self.ss_cmd
111 # Sanity check on reply.
112 if ret[1] != 0x30 or ret[2] != cmd[1] or ret[0] != self.yy:
113 self.putx([Ann.WARN, ['Warning: Unexpected bytes in reply!']])
115 def handle_cmd_read_signature_byte_0x02(self, cmd, ret):
116 # Signature byte 0x02: part number.
117 self.part_number = ret[3]
118 self.putx([Ann.RSB2, ['Part number: 0x%02x' % ret[3]]])
120 p = part[(self.part_fam_flash_size, self.part_number)]
121 data = [Ann.DEV, ['Device: Atmel %s' % p]]
122 self.put(self.ss_device, self.es_cmd, self.out_ann, data)
124 # Sanity check on reply.
125 if ret[1] != 0x30 or ret[2] != self.xx or ret[0] != self.mm:
126 self.putx([Ann.WARN, ['Warning: Unexpected bytes in reply!']])
128 self.xx, self.yy, self.zz, self.mm = 0, 0, 0, 0
130 def handle_cmd_chip_erase(self, cmd, ret):
131 # Chip erase (erases both flash an EEPROM).
132 # Upon successful chip erase, the lock bits will also be erased.
133 # The only way to end a Chip Erase cycle is to release RESET#.
134 self.putx([Ann.CE, ['Chip erase']])
136 # TODO: Check/handle RESET#.
138 # Sanity check on reply.
139 bit = (ret[2] & (1 << 7)) >> 7
140 if ret[1] != 0xac or bit != 1 or ret[3] != cmd[2]:
141 self.putx([Ann.WARN, ['Warning: Unexpected bytes in reply!']])
143 def handle_cmd_read_fuse_bits(self, cmd, ret):
145 self.putx([Ann.RFB, ['Read fuse bits: 0x%02x' % ret[3]]])
147 # TODO: Decode fuse bits.
148 # TODO: Sanity check on reply.
150 def handle_cmd_read_fuse_high_bits(self, cmd, ret):
151 # Read fuse high bits.
152 self.putx([Ann.RHFB, ['Read fuse high bits: 0x%02x' % ret[3]]])
154 # TODO: Decode fuse bits.
155 # TODO: Sanity check on reply.
157 def handle_cmd_read_extended_fuse_bits(self, cmd, ret):
158 # Read extended fuse bits.
159 self.putx([Ann.REFB, ['Read extended fuse bits: 0x%02x' % ret[3]]])
161 # TODO: Decode fuse bits.
162 # TODO: Sanity check on reply.
164 def handle_command(self, cmd, ret):
165 if cmd[:2] == [0xac, 0x53]:
166 self.handle_cmd_programming_enable(cmd, ret)
167 elif cmd[0] == 0xac and (cmd[1] & (1 << 7)) == (1 << 7):
168 self.handle_cmd_chip_erase(cmd, ret)
169 elif cmd[:3] == [0x50, 0x00, 0x00]:
170 self.handle_cmd_read_fuse_bits(cmd, ret)
171 elif cmd[:3] == [0x58, 0x08, 0x00]:
172 self.handle_cmd_read_fuse_high_bits(cmd, ret)
173 elif cmd[:3] == [0x50, 0x08, 0x00]:
174 self.handle_cmd_read_extended_fuse_bits(cmd, ret)
175 elif cmd[0] == 0x30 and cmd[2] == 0x00:
176 self.handle_cmd_read_signature_byte_0x00(cmd, ret)
177 elif cmd[0] == 0x30 and cmd[2] == 0x01:
178 self.handle_cmd_read_signature_byte_0x01(cmd, ret)
179 elif cmd[0] == 0x30 and cmd[2] == 0x02:
180 self.handle_cmd_read_signature_byte_0x02(cmd, ret)
182 c = '%02x %02x %02x %02x' % tuple(cmd)
183 r = '%02x %02x %02x %02x' % tuple(ret)
184 self.putx([Ann.WARN, ['Unknown command: %s (reply: %s)!' % (c, r)]])
186 def decode(self, ss, es, data):
187 ptype, mosi, miso = data
189 # For now, only use DATA and BITS packets.
190 if ptype not in ('DATA', 'BITS'):
193 # Store the individual bit values and ss/es numbers. The next packet
194 # is guaranteed to be a 'DATA' packet belonging to this 'BITS' one.
196 self.miso_bits, self.mosi_bits = miso, mosi
199 self.ss, self.es = ss, es
201 if len(self.mosi_bytes) == 0:
205 self.mosi_bytes.append(mosi)
206 self.miso_bytes.append(miso)
208 # All commands consist of 4 bytes.
209 if len(self.mosi_bytes) < 4:
214 self.handle_command(self.mosi_bytes, self.miso_bytes)