diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_lse.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_lse.c | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_lse.c b/nuttx/arch/arm/src/stm32/stm32_lse.c deleted file mode 100644 index 931199efd..000000000 --- a/nuttx/arch/arm/src/stm32/stm32_lse.c +++ /dev/null @@ -1,105 +0,0 @@ -/**************************************************************************** - * arch/arm/src/stm32/stm32_lse.c - * - * Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.orgr> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include "up_arch.h" - -#include "stm32_rcc.h" -#include "stm32_waste.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: stm32_rcc_enablelse - * - * Description: - * Enable the External Low-Speed (LSE) Oscillator and, if the RTC is - * configured, setup the LSE as the RTC clock source, and enable the RTC. - * - * Todo: - * Check for LSE good timeout and return with -1, - * - ****************************************************************************/ - -void stm32_rcc_enablelse(void) -{ - /* Enable the External Low-Speed (LSE) Oscillator by setting the LSEON bit - * the RCC BDCR register. - */ - - modifyreg16(STM32_RCC_BDCR, 0, RCC_BDCR_LSEON); - - /* Wait for the LSE clock to be ready */ - - while ((getreg16(STM32_RCC_BDCR) & RCC_BDCR_LSERDY) == 0) - { - up_waste(); - } - - /* The primariy purpose of the LSE clock is to drive the RTC. The RTC could - * also be driven by the LSI (but that would be very inaccurate) or by the - * HSE (but that would prohibit low-power operation) - * - * Select LSE as RTC Clock Source by setting the RTCSEL field of the RCC BDCR - * register. - */ - -#ifdef CONFIG_RTC - modifyreg16(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_LSE); - - /* Enable the RTC Clock by setting the RTCEN bit in the RCC BDCR register */ - - modifyreg16(STM32_RCC_BDCR, 0, RCC_BDCR_RTCEN); -#endif -} |