diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_pwr.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_pwr.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_pwr.c b/nuttx/arch/arm/src/stm32/stm32_pwr.c new file mode 100644 index 000000000..bada048e3 --- /dev/null +++ b/nuttx/arch/arm/src/stm32/stm32_pwr.c @@ -0,0 +1,98 @@ +/************************************************************************************ + * arch/arm/src/stm32/stm32_pwr.c + * + * Copyright (C) 2011 Uros Platise. All rights reserved. + * Author: Uros Platise <uros.platise@isotel.eu> + * + * 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 <nuttx/arch.h> + +#include <stdint.h> +#include <errno.h> + +#include "up_arch.h" +#include "stm32_pwr.h" + +#if defined(CONFIG_STM32_PWR) + +/************************************************************************************ + * Pre-processor Definitions + ************************************************************************************/ + +/************************************************************************************ + * Private Functions + ************************************************************************************/ + +static inline uint16_t stm32_pwr_getreg(uint8_t offset) +{ + return getreg32(STM32_PWR_BASE + offset); +} + +static inline void stm32_pwr_putreg(uint8_t offset, uint16_t value) +{ + putreg32(value, STM32_PWR_BASE + offset); +} + +static inline void stm32_pwr_modifyreg(uint8_t offset, uint16_t clearbits, uint16_t setbits) +{ + modifyreg32(STM32_PWR_BASE + offset, clearbits, setbits); +} + +/************************************************************************************ + * Public Functions + ************************************************************************************/ + +/************************************************************************************ + * Name: stm32_pwr_enablebkp + * + * Description: + * Enables access to the backup domain (RTC registers, RTC backup data registers + * and backup SRAM). + * + * Input Parameters: + * None + * + * Returned Values: + * None + * + ************************************************************************************/ + +void stm32_pwr_enablebkp(void) +{ + stm32_pwr_modifyreg(STM32_PWR_CR_OFFSET, 0, PWR_CR_DBP); +} + +#endif // defined(CONFIG_STM32_PWR) |