## ## This file is part of the libsigrokdecode project. ## ## Copyright (C) 2010-2012 Uwe Hermann ## ## 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 ## import sigrokdecode as srd class Decoder(srd.Decoder): api_version = 1 id = 'nunchuk' name = 'Nunchuk' longname = 'Nintendo Wii Nunchuk' desc = 'Nintendo Wii Nunchuk controller protocol.' license = 'gplv2+' inputs = ['i2c'] outputs = ['nunchuck'] probes = [] optional_probes = [] options = {} annotations = [ ['text-verbose', 'Human-readable text (verbose)'], ['text', 'Human-readable text'], ['warnings', 'Human-readable warnings'], ] def __init__(self, **kwargs): self.state = 'IDLE' self.sx = self.sy = self.ax = self.ay = self.az = self.bz = self.bc = -1 self.databytecount = 0 self.reg = 0x00 self.init_seq = [] def start(self): # self.out_proto = self.register(srd.OUTPUT_PYTHON) self.out_ann = self.register(srd.OUTPUT_ANN) def putx(self, data): # Helper for annotations which span exactly one I²C packet. self.put(self.ss, self.es, self.out_ann, data) def putb(self, data): # Helper for annotations which span a block of I²C packets. self.put(self.block_start_sample, self.block_end_sample, self.out_ann, data) def handle_reg_0x00(self, databyte): self.sx = databyte self.putx([0, ['Analog stick X position: 0x%02x' % self.sx]]) self.putx([1, ['SX: 0x%02x' % self.sx]]) def handle_reg_0x01(self, databyte): self.sy = databyte self.putx([0, ['Analog stick Y position: 0x%02x' % self.sy]]) self.putx([1, ['SY: 0x%02x' % self.sy]]) def handle_reg_0x02(self, databyte): self.ax = databyte << 2 self.putx([0, ['Accelerometer X value bits[9:2]: 0x%03x' % self.ax]]) self.putx([1, ['AX[9:2]: 0x%03x' % self.ax]]) def handle_reg_0x03(self, databyte): self.ay = databyte << 2 self.putx([0, ['Accelerometer Y value bits[9:2]: 0x%03x' % self.ay]]) self.putx([1, ['AY[9:2]: 0x%x' % self.ay]]) def handle_reg_0x04(self, databyte): self.az = databyte << 2 self.putx([0, ['Accelerometer Z value bits[9:2]: 0x%03x' % self.az]]) self.putx([1, ['AZ[9:2]: 0x%x' % self.az]]) # TODO: Bit-exact annotations. def handle_reg_0x05(self, databyte): self.bz = (databyte & (1 << 0)) >> 0 # Bits[0:0] self.bc = (databyte & (1 << 1)) >> 1 # Bits[1:1] ax_rest = (databyte & (3 << 2)) >> 2 # Bits[3:2] ay_rest = (databyte & (3 << 4)) >> 4 # Bits[5:4] az_rest = (databyte & (3 << 6)) >> 6 # Bits[7:6] self.ax |= ax_rest self.ay |= ay_rest self.az |= az_rest s = '' if (self.bz == 0) else 'not ' self.putx([0, ['Z button: %spressed' % s]]) self.putx([1, ['BZ: %d' % self.bz]]) s = '' if (self.bc == 0) else 'not ' self.putx([0, ['C button: %spressed' % s]]) self.putx([1, ['BC: %d' % self.bc]]) self.putx([0, ['Accelerometer X value bits[1:0]: 0x%x' % ax_rest]]) self.putx([1, ['AX[1:0]: 0x%x' % ax_rest]]) self.putx([0, ['Accelerometer Y value bits[1:0]: 0x%x' % ay_rest]]) self.putx([1, ['AY[1:0]: 0x%x' % ay_rest]]) self.putx([0, ['Accelerometer Z value bits[1:0]: 0x%x' % az_rest]]) self.putx([1, ['AZ[1:0]: 0x%x' % az_rest]]) def output_full_block_if_possible(self): # For now, only output summary annotation if all values are available. t = (self.sx, self.sy, self.ax, self.ay, self.az, self.bz, self.bc) if -1 in t: return s = 'Analog stick X position: 0x%02x\n' % self.sx s += 'Analog stick Y position: 0x%02x\n' % self.sy s += 'Z button: %spressed\n' % ('' if (self.bz == 0) else 'not ') s += 'C button: %spressed\n' % ('' if (self.bc == 0) else 'not ') s += 'Accelerometer X value: 0x%03x\n' % self.ax s += 'Accelerometer Y value: 0x%03x\n' % self.ay s += 'Accelerometer Z value: 0x%03x\n' % self.az self.put(self.block_start_sample, self.block_end_sample, self.out_ann, [0, [s]]) s = 'SX = 0x%02x, SY = 0x%02x, AX = 0x%02x, AY = 0x%02x, ' \ 'AZ = 0x%02x, BZ = 0x%02x, BC = 0x%02x' % (self.sx, \ self.sy, self.ax, self.ay, self.az, self.bz, self.bc) self.put(self.block_start_sample, self.block_end_sample, self.out_ann, [1, [s]]) def handle_reg_write(self, databyte): self.putx([0, ['Nunchuk write: 0x%02x' % databyte]]) if len(self.init_seq) < 2: self.init_seq.append(databyte) def output_init_seq(self): if len(self.init_seq) != 2: self.putb([2, ['Init sequence was %d bytes long (2 expected)' % \ len(self.init_seq)]]) if self.init_seq != (0x40, 0x00): self.putb([2, ['Unknown init sequence (expected: 0x40 0x00)']]) # TODO: Detect Nunchuk clones (they have different init sequences). s = 'Initialized Nintendo Wii Nunchuk' self.putb([0, [s]]) self.putb([1, ['INIT']]) def decode(self, ss, es, data): cmd, databyte = data # Store the start/end samples of this I²C packet. self.ss, self.es = ss, es # State machine. if self.state == 'IDLE': # Wait for an I²C START condition. if cmd != 'START': return self.state = 'GET SLAVE ADDR' self.block_start_sample = ss elif self.state == 'GET SLAVE ADDR': # Wait for an address read/write operation. if cmd == 'ADDRESS READ': self.state = 'READ REGS' elif cmd == 'ADDRESS WRITE': self.state = 'WRITE REGS' elif self.state == 'READ REGS': if cmd == 'DATA READ': handle_reg = getattr(self, 'handle_reg_0x%02x' % self.reg) handle_reg(databyte) self.reg += 1 elif cmd == 'STOP': self.block_end_sample = es self.output_full_block_if_possible() self.sx = self.sy = self.ax = self.ay = self.az = -1 self.bz = self.bc = -1 self.state = 'IDLE' else: # self.putx([0, ['Ignoring: %s (data=%s)' % (cmd, databyte)]]) pass elif self.state == 'WRITE REGS': if cmd == 'DATA WRITE': self.handle_reg_write(databyte) elif cmd == 'STOP': self.block_end_sample = es self.output_init_seq() self.init_seq = [] self.state = 'IDLE' else: # self.putx([0, ['Ignoring: %s (data=%s)' % (cmd, databyte)]]) pass else: raise Exception('Invalid state: %s' % self.state)