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[stm32] add basic IWDG watchdog implementation
Co-authored-by: Victor Costa <victor.houriecosta@zuehlke.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| /* | ||
| * Copyright (c) 2023, Zühlke Engineering (Austria) GmbH | ||
| * | ||
| * 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/. | ||
| */ | ||
| // ---------------------------------------------------------------------------- | ||
|
|
||
| #include "iwdg.hpp" | ||
|
|
||
| void | ||
| Iwdg::initialize(Iwdg::Prescaler prescaler, uint32_t reload) | ||
| { | ||
| writeKey(writeCommand); | ||
| IWDG->PR = (IWDG->PR & ~static_cast<uint32_t>(Iwdg::Prescaler::All)) | | ||
| static_cast<uint32_t>(prescaler); | ||
| IWDG->RLR = (IWDG->RLR & ~IWDG_RLR_RL) | (reload << IWDG_RLR_RL_Pos); | ||
| writeKey(0); // disable access to PR and RLR registers | ||
| } | ||
|
|
||
| void | ||
| Iwdg::enable() | ||
| { | ||
| writeKey(enableCommand); | ||
| } | ||
|
|
||
| void | ||
| Iwdg::trigger() | ||
| { | ||
| writeKey(reloadCommand); | ||
| } | ||
|
|
||
| void | ||
| Iwdg::writeKey(uint32_t key) | ||
| { | ||
| IWDG->KR = (IWDG->KR & ~IWDG_KR_KEY_Msk) | ((key & IWDG_KR_KEY_Msk) << IWDG_KR_KEY_Pos); | ||
| } | ||
|
|
||
| Iwdg::Status | ||
| Iwdg::getStatus() | ||
| { | ||
| const auto status = IWDG->SR & (IWDG_SR_PVU | IWDG_SR_RVU); | ||
| return static_cast<Status>(status); | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * Copyright (c) 2023, Zühlke Engineering (Austria) GmbH | ||
| * | ||
| * 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/. | ||
| */ | ||
| // ---------------------------------------------------------------------------- | ||
|
|
||
| #pragma once | ||
| #include "../device.hpp" | ||
|
|
||
| class Iwdg | ||
| { | ||
| public: | ||
| enum class | ||
| Prescaler : uint32_t | ||
| { | ||
| Div4 = 0, | ||
| Div8 = IWDG_PR_PR_0, | ||
| Div16 = IWDG_PR_PR_1, | ||
| Div32 = IWDG_PR_PR_1 | IWDG_PR_PR_0, | ||
| Div64 = IWDG_PR_PR_2, | ||
| Div128 = IWDG_PR_PR_2 | IWDG_PR_PR_0, | ||
| Div256 = IWDG_PR_PR_2 | IWDG_PR_PR_1, | ||
| All = IWDG_PR_PR_2 | IWDG_PR_PR_1 | IWDG_PR_PR_0, | ||
| }; | ||
|
|
||
| enum class | ||
| Status : uint32_t | ||
| { | ||
| None = 0, | ||
| Prescaler = IWDG_SR_PVU, | ||
| Reload = IWDG_SR_RVU, | ||
| All = IWDG_SR_PVU | IWDG_SR_RVU, | ||
| }; | ||
|
|
||
| static void | ||
| initialize(Prescaler prescaler, uint32_t reload); | ||
| static void | ||
| enable(); | ||
| static void | ||
| trigger(); | ||
| static Status | ||
| getStatus(); | ||
|
|
||
| private: | ||
| static constexpr uint32_t reloadCommand = 0xAAAA; | ||
| static constexpr uint32_t writeCommand = 0x5555; | ||
| static constexpr uint32_t enableCommand = 0xCCCC; | ||
|
|
||
| static void | ||
| writeKey(uint32_t key); | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| #!/usr/bin/env python3 | ||
| # -*- coding: utf-8 -*- | ||
| # | ||
| # Copyright (c) 2023, Zühlke Engineering (Austria) GmbH | ||
| # | ||
| # 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/. | ||
| # ----------------------------------------------------------------------------- | ||
|
|
||
| def init(module): | ||
| module.name = ":platform:iwdg" | ||
| module.description = "Independent watchdog" | ||
|
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| def prepare(module, options): | ||
| device = options[":target"] | ||
| target = device.identifier | ||
| if target["family"] in ["h7"]: | ||
| # STM32H7 is not yet supported with any IWDG implementation im modm | ||
| return False | ||
| return device.has_driver("iwdg:stm32") | ||
|
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| def build(env): | ||
| env.outbasepath = "modm/src/modm/platform/iwdg" | ||
| env.copy("iwdg.hpp") | ||
| env.copy("iwdg.cpp") |