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HDQ decoder for sigrok
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| # Copyright (c) 2024 JJTech <[email protected]> | |
| # | |
| # SPDX-License-Identifier: GPL-2.0-or-later | |
| """ | |
| HDQ (High-speed Data Queue) is a simple protocol used for Texas Instruments | |
| 'Gas Gauge' battery fuel gauges. It is used to read and write data to the fuel | |
| gauge's memory. | |
| Similarly to the '1-wire' protocol, it is a single-wire protocol that uses a | |
| single data line to communicate with the fuel gauge. | |
| Protocol documentation: https://www.ti.com/lit/pdf/slua408 | |
| """ | |
| import sigrokdecode as srd # type: ignore | |
| from .pd import Decoder |
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| # Copyright (c) 2024 JJTech <[email protected]> | |
| # Copyright (c) 2024 Nicolás Alvarez <[email protected]> | |
| # | |
| # SPDX-License-Identifier: GPL-2.0-or-later | |
| import sigrokdecode as srd # type: ignore | |
| class Decoder(srd.Decoder): | |
| api_version = 3 | |
| id = 'hdq' | |
| name = 'HDQ' | |
| longname = 'HDQ (High-speed Data Queue)' | |
| desc = 'Texas Instruments Gas Gauge battery fuel gauge protocol' | |
| license = 'mit' | |
| inputs = ['logic'] | |
| outputs = ['hdq'] | |
| tags = ['Embedded/industrial'] | |
| channels = ( | |
| {'id': 'data', 'name': 'Data', 'desc': 'Data line'}, | |
| ) | |
| options = () | |
| annotations = ( | |
| ('bit', 'Value'), | |
| ) | |
| annotation_rows = ( | |
| ('bits', 'Values', (0,)), | |
| ) | |
| def __init__(self): | |
| print("INIT") | |
| self.reset() | |
| def reset(self): | |
| print("RESET") | |
| self.sample_rate = None | |
| self.previous_sample_num = 0 | |
| def metadata(self, key, value): | |
| print("METADATA") | |
| if key == srd.SRD_CONF_SAMPLERATE: | |
| self.sample_rate = value | |
| def start(self): | |
| print("START") | |
| self.out_ann = self.register(srd.OUTPUT_ANN) | |
| def decode(self): | |
| print("DECODE") | |
| assert self.sample_rate is not None | |
| MICRO = 1_000_000 | |
| MIN_BREAK = self.sample_rate * 190 // MICRO | |
| MIN_ZERO = self.sample_rate * 86 // MICRO | |
| MAX_ZERO = self.sample_rate * 145 // MICRO | |
| MIN_ONE = self.sample_rate * 17 // MICRO | |
| MAX_ONE = self.sample_rate * 50 // MICRO | |
| while True: | |
| self.wait({0: 'f'}) | |
| fall_sample = self.samplenum | |
| self.wait({0: 'r'}) | |
| raise_sample = self.samplenum | |
| t = raise_sample - fall_sample | |
| ann_start = fall_sample | |
| ann_end = raise_sample | |
| if t > MIN_BREAK: | |
| self.put(ann_start, ann_end, self.out_ann, [0, ['Reset']]) | |
| elif MIN_ZERO <= t <= MAX_ZERO: | |
| self.put(ann_start, ann_end, self.out_ann, [0, ['0']]) | |
| elif MIN_ONE <= t <= MAX_ONE: | |
| self.put(ann_start, ann_end, self.out_ann, [0, ['1']]) |
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