mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/sleep.c
- Committer:
- mbed_official
- Date:
- 2014-02-19
- Revision:
- 100:0412b5443284
- Parent:
- 84:f54042cbc282
- Child:
- 129:0182c99221bc
File content as of revision 100:0412b5443284:
/* mbed Microcontroller Library ******************************************************************************* * Copyright (c) 2014, STMicroelectronics * All rights reserved. * * 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 of STMicroelectronics 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 HOLDER 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. ******************************************************************************* */ #include "sleep_api.h" #include "cmsis.h" static void SetSysClock_HSI(void) { __IO uint32_t StartUpCounter = 0, HSIStatus = 0; /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ /* Enable HSI */ RCC->CR |= ((uint32_t)RCC_CR_HSION); /* Wait till HSI is ready and if Time out is reached exit */ do { HSIStatus = RCC->CR & RCC_CR_HSIRDY; } while((HSIStatus == 0) && (StartUpCounter != HSI_STARTUP_TIMEOUT)); if ((RCC->CR & RCC_CR_HSIRDY) != RESET) { HSIStatus = (uint32_t)0x01; } else { HSIStatus = (uint32_t)0x00; } if (HSIStatus == (uint32_t)0x01) { /* Flash 0 wait state */ FLASH->ACR &= ~FLASH_ACR_LATENCY; /* Disable Prefetch Buffer */ FLASH->ACR &= ~FLASH_ACR_PRFTEN; /* Disable 64-bit access */ FLASH->ACR &= ~FLASH_ACR_ACC64; /* Power enable */ RCC->APB1ENR |= RCC_APB1ENR_PWREN; /* Select the Voltage Range 1 (1.8 V) */ PWR->CR = PWR_CR_VOS_0; /* Wait Until the Voltage Regulator is ready */ while((PWR->CSR & PWR_CSR_VOSF) != RESET) { } /* HCLK = SYSCLK /1*/ RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; /* PCLK2 = HCLK /1*/ RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; /* PCLK1 = HCLK /1*/ RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; /* Select HSI as system clock source */ RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSI; /* Wait till HSI is used as system clock source */ while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_HSI) { } } else { /* If HSI fails to start-up, the application will have wrong clock configuration. User can add here some code to deal with this error */ } } // MCU SLEEP mode void sleep(void) { // Enable PWR clock RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Request to enter SLEEP mode with regulator ON PWR_EnterSleepMode(PWR_Regulator_ON, PWR_SLEEPEntry_WFI); } // MCU STOP mode (Regulator in LP mode, LSI, HSI and HSE OFF) void deepsleep(void) { // Enable PWR clock RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable Ultra low power mode PWR_UltraLowPowerCmd(ENABLE); // Enter Stop Mode PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI); // After wake-up from STOP reconfigure the system clock (HSI) SetSysClock_HSI(); }