##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2012-2013 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
##

# Panasonic PAN1321 Bluetooth module protocol decoder

import sigrokdecode as srd

# ...
RX = 0
TX = 1

class Decoder(srd.Decoder):
    api_version = 1
    id = 'pan1321'
    name = 'PAN1321'
    longname = 'Panasonic PAN1321'
    desc = 'Bluetooth RF module with Serial Port Profile (SPP).'
    license = 'gplv2+'
    inputs = ['uart']
    outputs = ['pan1321']
    probes = []
    optional_probes = []
    options = {}
    annotations = [
        ['Text (verbose)', 'Human-readable text (verbose)'],
        ['Text', 'Human-readable text'],
        ['Warnings', 'Human-readable warnings'],
    ]

    def __init__(self, **kwargs):
        self.cmd = ['', '']
        self.ss_block = None

    def start(self, metadata):
        # self.out_proto = self.add(srd.OUTPUT_PROTO, 'pan1321')
        self.out_ann = self.add(srd.OUTPUT_ANN, 'pan1321')

    def report(self):
        pass

    def putx(self, data):
        self.put(self.ss_block, self.es_block, self.out_ann, data)

    def handle_host_command(self, rxtx, s):
        if s.startswith('AT+JPRO'):
            p = s[s.find('=') + 1:]
            if p not in ('0', '1'):
                self.putx([2, ['Warning: Invalid JPRO parameter "%s"' % p]])
                return
            onoff = 'off' if (p == '0') else 'on'
            x = 'Leaving' if (p == '0') else 'Entering'
            self.putx([0, ['%s production mode' % x]])
            self.putx([1, ['Production mode = %s' % onoff]])
        elif s.startswith('AT+JRES'):
            if s != 'AT+JRES': # JRES has no params.
                self.putx([2, ['Warning: Invalid JRES usage.']])
                return
            self.putx([0, ['Triggering a software reset']])
            self.putx([1, ['Reset']])
        elif s.startswith('AT+JSEC'):
            pin = s[-4:]
            self.putx([0, ['Host set the Bluetooth PIN to "' + pin + '"']])
            self.putx([1, ['PIN = ' + pin]])
        elif s.startswith('AT+JSLN'):
            name = s[s.find(',') + 1:]
            self.putx([0, ['Host set the Bluetooth name to "' + name + '"']])
            self.putx([1, ['BT name = ' + name]])
        else:
            self.putx([0, ['Host sent unsupported command: %s' % s]])
            self.putx([1, ['Unsupported command: %s' % s]])

    def handle_device_reply(self, rxtx, s):
        if s == 'ROK':
            self.putx([0, ['Device initialized correctly']])
            self.putx([1, ['Init']])
        elif s == 'OK':
            self.putx([0, ['Device acknowledged last command']])
            self.putx([1, ['ACK']])
        elif s.startswith('ERR'):
            error = s[s.find('=') + 1:]
            self.putx([0, ['Device sent error code ' + error]])
            self.putx([1, ['ERR = ' + error]])
        else:
            self.putx([0, ['Device sent an unknown reply: %s' % s]])
            self.putx([1, ['Unknown reply: %s' % s]])

    def decode(self, ss, es, data):
        ptype, rxtx, pdata = data

        # For now, ignore all UART packets except the actual data packets.
        if ptype != 'DATA':
            return

        # If this is the start of a command/reply, remember the start sample.
        if self.cmd[rxtx] == '':
            self.ss_block = ss

        # Append a new (ASCII) byte to the currently built/parsed command.
        self.cmd[rxtx] += chr(pdata)

        # Get packets/bytes until an \r\n sequence is found (end of command).
        if self.cmd[rxtx][-1:] != '\n':
            return

        # Handle host commands and device replies.
        # We remove trailing \r\n from the strings before handling them.
        self.es_block = es
        if rxtx == RX:
            self.handle_device_reply(rxtx, self.cmd[rxtx][:-2])
        elif rxtx == TX:
            self.handle_host_command(rxtx, self.cmd[rxtx][:-2])
        else:
            raise Exception('Invalid rxtx value: %d' % rxtx)

        self.cmd[rxtx] = ''