f073092fad
In stm32_rtcc.c the up_rtcinitialize() logic doesn't work with the LSI. The check on RTC_MAGIC on the BK0R register lead to rtc_setup() call that rightfully enables the lsi clock; but the next times, when the rtc is already setup, the rtc_resume() call does NOT start the lsi clock! The right place to put LSE/LSI initialisation is inside stm32_stdclockconfig() in stm32fxxxxx_rcc.c. Doing this I checked the possible uses of the LSI and the LSE sources: the LSI can be used for RTC and/or the IWDG, while the LSE only for the RTC (and to output the MCO1 pin).. This change is not verifed for any other platforms. From Leo Aloe3132
101 lines
3.8 KiB
C
101 lines
3.8 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_lsi.c
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*
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* Copyright (C) 2012, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.orgr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "up_arch.h"
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#include "stm32_rcc.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_rcc_enablelsi
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*
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* Description:
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* Enable the Internal Low-Speed (LSI) RC Oscillator.
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*
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****************************************************************************/
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void stm32_rcc_enablelsi(void)
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{
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/* Enable the Internal Low-Speed (LSI) RC Oscillator by setting the LSION bit
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* the RCC CSR register.
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*/
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modifyreg32(STM32_RCC_CSR, 0, RCC_CSR_LSION);
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/* Wait for the internal RC 40 kHz oscillator to be stable. */
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while ((getreg32(STM32_RCC_CSR) & RCC_CSR_LSIRDY) == 0);
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}
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/****************************************************************************
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* Name: stm32_rcc_disablelsi
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*
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* Description:
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* Disable the Internal Low-Speed (LSI) RC Oscillator.
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*
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****************************************************************************/
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void stm32_rcc_disablelsi(void)
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{
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/* Enable the Internal Low-Speed (LSI) RC Oscillator by setting the LSION bit
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* the RCC CSR register.
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*/
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modifyreg32(STM32_RCC_CSR, RCC_CSR_LSION, 0);
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/* LSIRDY should go low after 3 LSI clock cycles */
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}
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