114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file RCCv1/stm32_lsi.inc
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* @brief Shared LSI clock handler.
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*
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* @addtogroup STM32_LSI_HANDLER
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* @{
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*/
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/**
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* @brief LSI clock frequency.
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*/
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#define STM32_LSIRCCLK 32000U
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/**
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* @name RCC_CSR register bits definitions
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* @{
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*/
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#define STM32_LSIPRE_MASK (1U << RCC_CSR_LSIPRE_Pos)
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#define STM32_LSIPRE_NODIV (0U << RCC_CSR_LSIPRE_Pos)
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#define STM32_LSIPRE_DIV128 (1U << RCC_CSR_LSIPRE_Pos)
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/** @} */
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/* Registry checks for robustness.*/
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#if !defined(STM32_RCC_HAS_LSI)
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#error "STM32_RCC_HAS_LSI not defined in stm32_registry.h"
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#endif
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#if !defined(STM32_RCC_HAS_LSI_PRESCALER)
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#error "STM32_RCC_HAS_LSI_PRESCALER not defined in stm32_registry.h"
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#endif
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/* Checks on configurations.*/
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#if !defined(STM32_LSI_ENABLED)
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#error "STM32_LSI_ENABLED not defined in mcuconf.h"
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#endif
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#if STM32_RCC_HAS_LSI_PRESCALER || defined(__DOXYGEN__)
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#if !defined(STM32_LSIPRE)
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#error "STM32_LSIPRE not defined in mcuconf.h"
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#endif
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/**
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* @brief LSI frequency.
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*/
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#if (STM32_LSIPRE == STM32_LSIPRE_NODIV) || defined(__DOXYGEN__)
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#define STM32_LSICLK (STM32_LSIRCCLK)
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#elif STM32_LSIPRE == STM32_LSIPRE_DIV128
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#define STM32_LSICLK (STM32_LSIRCCLK / 128U)
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#else
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#error "invalid STM32_LSIPRE value specified"
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#endif
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#else /* !STM32_RCC_HAS_LSI_PRESCALER */
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#define STM32_LSIPRE 0U
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#define STM32_LSICLK (STM32_LSIRCCLK)
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#endif /* !STM32_RCC_HAS_LSI_PRESCALER */
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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__STATIC_INLINE void lsi_init(void) {
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#if STM32_LSI_ENABLED
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/* LSI activation.*/
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RCC->CSR |= STM32_LSIPRE | RCC_CSR_LSION;
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while ((RCC->CSR & RCC_CSR_LSIRDY) == 0U) {
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}
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#endif
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/** @} */
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