decoders/st7735/pd.py

   1 ##
   2 ## This file is part of the libsigrokdecode project.
   3 ##
   4 ## Copyright (C) 2018 Aleksander Alekseev <afiskon@gmail.com>
   5 ##
   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.
  10 ##
  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.
  15 ##
  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/>.
  18
  19 import sigrokdecode as srd
  20
  21 MAX_DATA_LEN = 128
  22
  23 # Command ID -> name, short description
  24 META = {
  25     0x00: {'name': 'NOP    ', 'desc': 'No operation'},
  26     0x01: {'name': 'SWRESET', 'desc': 'Software reset'},
  27     0x04: {'name': 'RDDID  ', 'desc': 'Read display ID'},
  28     0x09: {'name': 'RDDST  ', 'desc': 'Read display status'},
  29     0x10: {'name': 'SLPIN  ', 'desc': 'Sleep in & booster off'},
  30     0x11: {'name': 'SLPOUT ', 'desc': 'Sleep out & booster on'},
  31     0x12: {'name': 'PTLON  ', 'desc': 'Partial mode on'},
  32     0x13: {'name': 'NORON  ', 'desc': 'Partial off (normal)'},
  33     0x20: {'name': 'INVOFF ', 'desc': 'Display inversion off'},
  34     0x21: {'name': 'INVON  ', 'desc': 'Display inversion on'},
  35     0x28: {'name': 'DISPOFF', 'desc': 'Display off'},
  36     0x29: {'name': 'DISPON ', 'desc': 'Display on'},
  37     0x2A: {'name': 'CASET  ', 'desc': 'Column address set'},
  38     0x2B: {'name': 'RASET  ', 'desc': 'Row address set'},
  39     0x2C: {'name': 'RAMWR  ', 'desc': 'Memory write'},
  40     0x2E: {'name': 'RAMRD  ', 'desc': 'Memory read'},
  41     0x30: {'name': 'PTLAR  ', 'desc': 'Partial start/end address set'},
  42     0x36: {'name': 'MADCTL ', 'desc': 'Memory data address control'},
  43     0x3A: {'name': 'COLMOD ', 'desc': 'Interface pixel format'},
  44     0xB1: {'name': 'FRMCTR1', 'desc': 'Frame rate control (in normal mode / full colors)'},
  45     0xB2: {'name': 'FRMCTR2', 'desc': 'Frame rate control (in idle mode / 8-colors)'},
  46     0xB3: {'name': 'FRMCTR3', 'desc': 'Frame rate control (in partial mode / full colors) '},
  47     0xB4: {'name': 'INVCTR ', 'desc': 'Display inversion control'},
  48     0xB6: {'name': 'DISSET5', 'desc': 'Display function set 5'},
  49     0xC0: {'name': 'PWCTR1 ', 'desc': 'Power control 1'},
  50     0xC1: {'name': 'PWCTR2 ', 'desc': 'Power control 2'},
  51     0xC2: {'name': 'PWCTR3 ', 'desc': 'Power control 3'},
  52     0xC3: {'name': 'PWCTR4 ', 'desc': 'Power control 4'},
  53     0xC4: {'name': 'PWCTR5 ', 'desc': 'Power control 5'},
  54     0xC5: {'name': 'VMCTR1 ', 'desc': 'VCOM control 1'},
  55     0xDA: {'name': 'RDID1  ', 'desc': 'Read ID1'},
  56     0xDB: {'name': 'RDID2  ', 'desc': 'Read ID2'},
  57     0xDC: {'name': 'RDID3  ', 'desc': 'Read ID3'},
  58     0xDD: {'name': 'RDID4  ', 'desc': 'Read ID4'},
  59     0xFC: {'name': 'PWCTR6 ', 'desc': 'Power control 6'},
  60     0xE0: {'name': 'GMCTRP1', 'desc': 'Gamma \'+\'polarity correction characteristics setting'},
  61     0xE1: {'name': 'GMCTRN1', 'desc': 'Gamma \'-\'polarity correction characteristics setting'},
  62 }
  63
  64 class Ann:
  65     BITS, CMD, DATA, DESC = range(4)
  66
  67 class Decoder(srd.Decoder):
  68     api_version = 3
  69     id = 'st7735'
  70     name = 'ST7735'
  71     longname = 'Sitronix ST7735'
  72     desc = 'Sitronix ST7735 TFT controller protocol.'
  73     license = 'gplv2+'
  74     inputs = ['logic']
  75     outputs = []
  76     tags = ['Display', 'IC']
  77     channels = (
  78         {'id': 'cs', 'name': 'CS#', 'desc': 'Chip-select'},
  79         {'id': 'clk', 'name': 'CLK', 'desc': 'Clock'},
  80         {'id': 'mosi', 'name': 'MOSI', 'desc': 'Master out, slave in'},
  81         {'id': 'dc', 'name': 'DC', 'desc': 'Data or command'}
  82     )
  83     annotations = (
  84         ('bit', 'Bit'),
  85         ('command', 'Command'),
  86         ('data', 'Data'),
  87         ('description', 'Description'),
  88     )
  89     annotation_rows = (
  90         ('bits', 'Bits', (Ann.BITS,)),
  91         ('fields', 'Fields', (Ann.CMD, Ann.DATA)),
  92         ('descriptions', 'Descriptions', (Ann.DESC,)),
  93     )
  94
  95     def __init__(self):
  96         self.reset()
  97
  98     def reset(self):
  99         self.accum_byte = 0
 100         self.accum_bits_num = 0
 101         self.bit_ss = -1
 102         self.byte_ss = -1
 103         self.current_bit = -1
 104
 105     def start(self):
 106         self.out_ann = self.register(srd.OUTPUT_ANN)
 107
 108     def put_desc(self, ss, es, cmd, data):
 109         if cmd == -1:
 110             return
 111         if cmd in META:
 112             self.put(ss, es, self.out_ann, [Ann.DESC,
 113                 ['%s: %s' % (META[cmd]['name'].strip(), META[cmd]['desc'])]])
 114         else:
 115             # Default description:
 116             dots = ''
 117             if len(data) == MAX_DATA_LEN:
 118                 data = data[:-1]
 119                 dots = '...'
 120             data_str = '(none)'
 121             if len(data) > 0:
 122                 data_str = ' '.join(['%02X' % b for b in data])
 123             self.put(ss, es, self.out_ann, [Ann.DESC,
 124                 ['Unknown command: %02X. Data: %s%s' % (cmd, data_str, dots)]])
 125
 126     def decode(self):
 127         current_cmd = -1
 128         current_data = []
 129         desc_ss = -1
 130         desc_es = -1
 131         self.reset()
 132         while True:
 133             # Check data on both CLK edges.
 134             (cs, clk, mosi, dc) = self.wait({1: 'e'})
 135
 136             if cs == 1: # Wait for CS = low, ignore the rest.
 137                 self.reset()
 138                 continue
 139
 140             if clk == 1:
 141                 # Read one bit.
 142                 self.bit_ss = self.samplenum
 143                 if self.accum_bits_num == 0:
 144                     self.byte_ss = self.samplenum
 145                 self.current_bit = mosi
 146
 147             if (clk == 0) and (self.current_bit >= 0):
 148                 # Process one bit.
 149                 self.put(self.bit_ss, self.samplenum, self.out_ann,
 150                          [Ann.BITS, [str(self.current_bit)]])
 151                 self.accum_byte = (self.accum_byte << 1) | self.current_bit # MSB-first.
 152                 self.accum_bits_num += 1
 153                 if self.accum_bits_num == 8:
 154                     # Process one byte.
 155                     ann = Ann.DATA if dc else Ann.CMD # DC = low for commands.
 156                     self.put(self.byte_ss, self.samplenum, self.out_ann,
 157                              [ann, ['%02X' % self.accum_byte]])
 158                     if ann == Ann.CMD:
 159                         self.put_desc(desc_ss, desc_es, current_cmd, current_data)
 160                         desc_ss = self.byte_ss
 161                         desc_es = self.samplenum # For cmds without data.
 162                         current_cmd = self.accum_byte
 163                         current_data = []
 164                     else:
 165                         if len(current_data) < MAX_DATA_LEN:
 166                             current_data += [self.accum_byte]
 167                         desc_es = self.samplenum
 168
 169                     self.accum_bits_num = 0
 170                     self.accum_byte = 0
 171                     self.byte_ss = -1
 172                 self.current_bit = -1
 173                 self.bit_ss = -1