diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_rcc.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_rcc.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_rcc.c b/nuttx/arch/arm/src/stm32/stm32_rcc.c new file mode 100644 index 000000000..6656186f2 --- /dev/null +++ b/nuttx/arch/arm/src/stm32/stm32_rcc.c @@ -0,0 +1,183 @@ +/**************************************************************************** + * arch/arm/src/stm32/stm32_rcc.c + * + * Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <stdint.h> +#include <stdio.h> +#include <assert.h> +#include <debug.h> + +#include <arch/board/board.h> + +#include "up_internal.h" +#include "up_arch.h" + +#include "chip.h" +#include "stm32_rcc.h" +#include "stm32_flash.h" +#include "stm32_internal.h" +#include "stm32_waste.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/* Allow up to 100 milliseconds for the high speed clock to become ready. + * that is a very long delay, but if the clock does not become ready we are + * hosed anyway. + */ + +#define HSERDY_TIMEOUT (100 * CONFIG_BOARD_LOOPSPERMSEC) + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* Include chip-specific clocking initialization logic */ + +#if defined(CONFIG_STM32_STM32F10XX) +# include "chip/stm32f10xxx_rcc.c" +#elif defined(CONFIG_STM32_STM32F20XX) +# include "chip/stm32f20xxx_rcc.c" +#elif defined(CONFIG_STM32_STM32F40XX) +# include "chip/stm32f40xxx_rcc.c" +#else +# error "Unsupported STM32 chip" +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/************************************************************************************ + * Name: stm32_clockconfig + * + * Description: + * Called to establish the clock settings based on the values in board.h. This + * function (by default) will reset most everything, enable the PLL, and enable + * peripheral clocking for all periperipherals enabled in the NuttX configuration + * file. + * + * If CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG is defined, then clocking will + * be enabled by an externally provided, board-specific function called + * stm32_board_clockconfig(). + * + * Input Parameters: + * None + * + * Returned Value: + * None + * + ************************************************************************************/ + +void stm32_clockconfig(void) +{ + /* Make sure that we are starting in the reset state */ + + rcc_reset(); + +#if defined(CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG) + + /* Invoke Board Custom Clock Configuration */ + + stm32_board_clockconfig(); + +#else + + /* Invoke standard, fixed clock configuration based on definitions in board.h */ + + stm32_stdclockconfig(); + +#endif + + /* Enable peripheral clocking */ + + rcc_enableperipherals(); +} + +/************************************************************************************ + * Name: stm32_clockenable + * + * Description: + * Re-enable the clock and restore the clock settings based on settings in board.h. + * This function is only available to support low-power modes of operation: When + * re-awakening from deep-sleep modes, it is necessary to re-enable/re-start the + * PLL + * + * This functional performs a subset of the operations performed by + * stm32_clockconfig(): It does not reset any devices, and it does not reset the + * currenlty enabled peripheral clocks. + * + * If CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG is defined, then clocking will + * be enabled by an externally provided, board-specific function called + * stm32_board_clockconfig(). + * + * Input Parameters: + * None + * + * Returned Value: + * None + * + ************************************************************************************/ + +#ifdef CONFIG_PM +void stm32_clockenable(void) +{ +#if defined(CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG) + + /* Invoke Board Custom Clock Configuration */ + + stm32_board_clockconfig(); + +#else + + /* Invoke standard, fixed clock configuration based on definitions in board.h */ + + stm32_stdclockconfig(); + +#endif +} +#endif + + |