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wald-zatvictorandrehc
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rleh
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[stm32] add basic IWDG watchdog implementation
Co-authored-by: Victor Costa <[email protected]>
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‎README.md

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@@ -396,6 +396,30 @@ Please [discover modm's peripheral drivers for your specific device][discover].
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<td align="center">✕</td>
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<td align="center">✕</td>
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</tr><tr>
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<td align="left">IWDG</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">○</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✅</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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<td align="center">✕</td>
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</tr><tr>
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<td align="left">Random Generator</td>
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<td align="center">✕</td>
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<td align="center">✕</td>

‎src/modm/platform/iwdg/stm32/iwdg.cpp

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/*
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* Copyright (c) 2023, Zühlke Engineering (Austria) GmbH
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*
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* This file is part of the modm project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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// ----------------------------------------------------------------------------
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#include "iwdg.hpp"
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void
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Iwdg::initialize(Iwdg::Prescaler prescaler, uint32_t reload)
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{
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writeKey(writeCommand);
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IWDG->PR = (IWDG->PR & ~static_cast<uint32_t>(Iwdg::Prescaler::All)) |
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static_cast<uint32_t>(prescaler);
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IWDG->RLR = (IWDG->RLR & ~IWDG_RLR_RL) | (reload << IWDG_RLR_RL_Pos);
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writeKey(0); // disable access to PR and RLR registers
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}
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void
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Iwdg::enable()
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{
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writeKey(enableCommand);
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}
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void
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Iwdg::trigger()
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{
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writeKey(reloadCommand);
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}
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void
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Iwdg::writeKey(uint32_t key)
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{
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IWDG->KR = (IWDG->KR & ~IWDG_KR_KEY_Msk) | ((key & IWDG_KR_KEY_Msk) << IWDG_KR_KEY_Pos);
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}
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Iwdg::Status
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Iwdg::getStatus()
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{
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const auto status = IWDG->SR & (IWDG_SR_PVU | IWDG_SR_RVU);
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return static_cast<Status>(status);
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};

‎src/modm/platform/iwdg/stm32/iwdg.hpp

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/*
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* Copyright (c) 2023, Zühlke Engineering (Austria) GmbH
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*
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* This file is part of the modm project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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// ----------------------------------------------------------------------------
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#pragma once
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#include "../device.hpp"
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class Iwdg
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{
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public:
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enum class
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Prescaler : uint32_t
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{
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Div4 = 0,
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Div8 = IWDG_PR_PR_0,
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Div16 = IWDG_PR_PR_1,
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Div32 = IWDG_PR_PR_1 | IWDG_PR_PR_0,
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Div64 = IWDG_PR_PR_2,
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Div128 = IWDG_PR_PR_2 | IWDG_PR_PR_0,
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Div256 = IWDG_PR_PR_2 | IWDG_PR_PR_1,
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All = IWDG_PR_PR_2 | IWDG_PR_PR_1 | IWDG_PR_PR_0,
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};
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enum class
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Status : uint32_t
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{
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None = 0,
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Prescaler = IWDG_SR_PVU,
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Reload = IWDG_SR_RVU,
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All = IWDG_SR_PVU | IWDG_SR_RVU,
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};
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static void
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initialize(Prescaler prescaler, uint32_t reload);
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static void
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enable();
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static void
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trigger();
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static Status
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getStatus();
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private:
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static constexpr uint32_t reloadCommand = 0xAAAA;
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static constexpr uint32_t writeCommand = 0x5555;
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static constexpr uint32_t enableCommand = 0xCCCC;
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static void
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writeKey(uint32_t key);
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};

‎src/modm/platform/iwdg/stm32/module.lb

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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2023, Zühlke Engineering (Austria) GmbH
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#
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# This file is part of the modm project.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# -----------------------------------------------------------------------------
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def init(module):
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module.name = ":platform:iwdg"
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module.description = "Independent watchdog"
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def prepare(module, options):
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device = options[":target"]
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target = device.identifier
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if target["family"] in ["h7"]:
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# STM32H7 is not yet supported with any IWDG implementation im modm
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return False
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return device.has_driver("iwdg:stm32")
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def build(env):
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env.outbasepath = "modm/src/modm/platform/iwdg"
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env.copy("iwdg.hpp")
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env.copy("iwdg.cpp")

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