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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (c) 2020, Sascha Schade | ||
| * | ||
| * This file is part of the modm project. | ||
| * | ||
| * This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
| // ---------------------------------------------------------------------------- | ||
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| #ifndef MODM_HX711_HPP | ||
| #define MODM_HX711_HPP | ||
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| #include <modm/architecture/interface/delay.hpp> | ||
| #include <modm/processing/resumable.hpp> | ||
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| namespace modm | ||
| { | ||
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| /// @ingroup modm_driver_hx711 | ||
| struct hx711 | ||
| { | ||
| enum class | ||
| InputChannelAndGain : uint8_t | ||
| { | ||
| ChA_128 = 1, | ||
| ChB_32 = 2, | ||
| ChA_64 = 3 | ||
| }; | ||
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| struct Config | ||
| { | ||
| using Sck = void; // required | ||
| using Data = void; // required | ||
| static const InputChannelAndGain mode = InputChannelAndGain::ChA_128; | ||
| }; | ||
| }; | ||
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| template <typename Cfg> | ||
| class Hx711 : public hx711, protected modm::NestedResumable<2> | ||
| { | ||
| using Sck = typename Cfg::Sck; | ||
| using Data = typename Cfg::Data; | ||
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| public: | ||
| modm::ResumableResult<int32_t> | ||
| singleConversion(); | ||
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| private: | ||
| int32_t data; | ||
| }; | ||
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| } // modm namespace | ||
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| #include "hx711_impl.hpp" | ||
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| #endif // MODM_HX711_HPP |
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| #!/usr/bin/env python3 | ||
| # -*- coding: utf-8 -*- | ||
| # | ||
| # Copyright (c) 2020, Sascha Schade | ||
| # | ||
| # This file is part of the modm project. | ||
| # | ||
| # This Source Code Form is subject to the terms of the Mozilla Public | ||
| # License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| # file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| # ----------------------------------------------------------------------------- | ||
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| def init(module): | ||
| module.name = ":driver:hx711" | ||
| module.description = """\ | ||
| # HX711 Load Cell Amplifier and ADC | ||
| The HX711 is an integrated load cell amplifier designed for weight scales and | ||
| industrial control applications to interface directly with a bridge sensor. | ||
| The interface is bit-bang and timing based, so only GPIO is needed. | ||
| In a complete system the SCK pin's timing while reading must be met. | ||
| """ | ||
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| def prepare(module, options): | ||
| module.depends( | ||
| ":architecture:delay", | ||
| ":architecture:gpio", | ||
| ":processing:resumable") | ||
| return True | ||
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| def build(env): | ||
| env.outbasepath = "modm/src/modm/driver/adc" | ||
| env.copy("hx711.hpp") | ||
| env.copy("hx711_impl.hpp") |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * Copyright (c) 2020, Sascha Schade | ||
| * | ||
| * This file is part of the modm project. | ||
| * | ||
| * This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
| // ---------------------------------------------------------------------------- | ||
|
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| #ifndef MODM_HX711_HPP | ||
| # error "Don't include this file directly! Use 'hx711.hpp' instead." | ||
| #endif | ||
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| namespace modm | ||
| { | ||
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| template <typename Cfg> | ||
| ResumableResult<int32_t> | ||
| Hx711<Cfg>::singleConversion() | ||
| { | ||
| RF_BEGIN(); | ||
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| RF_WAIT_UNTIL(Data::read() == modm::Gpio::Low); | ||
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| modm::delayMicroseconds(1); | ||
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| data = 0; | ||
| for (uint8_t ii = 0; ii < 24; ++ii) | ||
| { | ||
| Sck::set(); | ||
| modm::delayMicroseconds(1); | ||
| data = (data << 1) | Data::read(); | ||
| modm::delayMicroseconds(1); | ||
| Sck::reset(); | ||
| modm::delayMicroseconds(1); | ||
| } | ||
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| // Additional pulses for mode of next conversion | ||
| for (uint8_t ii = 0; ii < static_cast<uint8_t>(Cfg::mode); ++ii) { | ||
| Sck::set(); | ||
| modm::delayMicroseconds(1); | ||
| Sck::reset(); | ||
| modm::delayMicroseconds(1); | ||
| } | ||
|
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| // Fill up MSBs for negative numbers | ||
| if (data & (1 << 23)) { | ||
| data |= 0xff000000; | ||
| } | ||
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| RF_END_RETURN(data); | ||
| } | ||
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| } // modm namespace |