shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/sleep.c@100:0412b5443284, 2014-02-19 (annotated)

Committer:
mbed_official
Date:
Wed Feb 19 17:15:16 2014 +0000
Revision:
100:0412b5443284
Parent:
84:f54042cbc282
Child:
129:0182c99221bc
Synchronized with git revision 32764eb5d53a8f94e397b2246dba1007e1d30737



Full URL: https://github.com/mbedmicro/mbed/commit/32764eb5d53a8f94e397b2246dba1007e1d30737/



Change us_ticker timer (32-bit) on Nucleo L152RE and F401RE

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "sleep_api.h"
mbed_official 76:aeb1df146756 31 #include "cmsis.h"
mbed_official 76:aeb1df146756 32
mbed_official 80:66393a7b209d 33 static void SetSysClock_HSI(void)
mbed_official 80:66393a7b209d 34 {
mbed_official 80:66393a7b209d 35 __IO uint32_t StartUpCounter = 0, HSIStatus = 0;
mbed_official 80:66393a7b209d 36
mbed_official 80:66393a7b209d 37 /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
mbed_official 80:66393a7b209d 38 /* Enable HSI */
mbed_official 80:66393a7b209d 39 RCC->CR |= ((uint32_t)RCC_CR_HSION);
mbed_official 80:66393a7b209d 40
mbed_official 80:66393a7b209d 41 /* Wait till HSI is ready and if Time out is reached exit */
mbed_official 80:66393a7b209d 42 do
mbed_official 80:66393a7b209d 43 {
mbed_official 80:66393a7b209d 44 HSIStatus = RCC->CR & RCC_CR_HSIRDY;
mbed_official 80:66393a7b209d 45 } while((HSIStatus == 0) && (StartUpCounter != HSI_STARTUP_TIMEOUT));
mbed_official 80:66393a7b209d 46
mbed_official 80:66393a7b209d 47 if ((RCC->CR & RCC_CR_HSIRDY) != RESET)
mbed_official 80:66393a7b209d 48 {
mbed_official 80:66393a7b209d 49 HSIStatus = (uint32_t)0x01;
mbed_official 80:66393a7b209d 50 }
mbed_official 80:66393a7b209d 51 else
mbed_official 80:66393a7b209d 52 {
mbed_official 80:66393a7b209d 53 HSIStatus = (uint32_t)0x00;
mbed_official 80:66393a7b209d 54 }
mbed_official 80:66393a7b209d 55
mbed_official 80:66393a7b209d 56 if (HSIStatus == (uint32_t)0x01)
mbed_official 80:66393a7b209d 57 {
mbed_official 80:66393a7b209d 58 /* Flash 0 wait state */
mbed_official 80:66393a7b209d 59 FLASH->ACR &= ~FLASH_ACR_LATENCY;
mbed_official 80:66393a7b209d 60
mbed_official 80:66393a7b209d 61 /* Disable Prefetch Buffer */
mbed_official 80:66393a7b209d 62 FLASH->ACR &= ~FLASH_ACR_PRFTEN;
mbed_official 80:66393a7b209d 63
mbed_official 80:66393a7b209d 64 /* Disable 64-bit access */
mbed_official 80:66393a7b209d 65 FLASH->ACR &= ~FLASH_ACR_ACC64;
mbed_official 80:66393a7b209d 66
mbed_official 80:66393a7b209d 67 /* Power enable */
mbed_official 80:66393a7b209d 68 RCC->APB1ENR |= RCC_APB1ENR_PWREN;
mbed_official 80:66393a7b209d 69
mbed_official 80:66393a7b209d 70 /* Select the Voltage Range 1 (1.8 V) */
mbed_official 80:66393a7b209d 71 PWR->CR = PWR_CR_VOS_0;
mbed_official 80:66393a7b209d 72
mbed_official 80:66393a7b209d 73 /* Wait Until the Voltage Regulator is ready */
mbed_official 80:66393a7b209d 74 while((PWR->CSR & PWR_CSR_VOSF) != RESET)
mbed_official 80:66393a7b209d 75 {
mbed_official 80:66393a7b209d 76 }
mbed_official 80:66393a7b209d 77
mbed_official 80:66393a7b209d 78 /* HCLK = SYSCLK /1*/
mbed_official 80:66393a7b209d 79 RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;
mbed_official 80:66393a7b209d 80 /* PCLK2 = HCLK /1*/
mbed_official 80:66393a7b209d 81 RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
mbed_official 80:66393a7b209d 82
mbed_official 80:66393a7b209d 83 /* PCLK1 = HCLK /1*/
mbed_official 80:66393a7b209d 84 RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
mbed_official 80:66393a7b209d 85
mbed_official 80:66393a7b209d 86 /* Select HSI as system clock source */
mbed_official 80:66393a7b209d 87 RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
mbed_official 80:66393a7b209d 88 RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSI;
mbed_official 80:66393a7b209d 89
mbed_official 80:66393a7b209d 90 /* Wait till HSI is used as system clock source */
mbed_official 80:66393a7b209d 91 while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_HSI)
mbed_official 80:66393a7b209d 92 {
mbed_official 80:66393a7b209d 93 }
mbed_official 80:66393a7b209d 94 }
mbed_official 80:66393a7b209d 95 else
mbed_official 80:66393a7b209d 96 {
mbed_official 80:66393a7b209d 97 /* If HSI fails to start-up, the application will have wrong clock
mbed_official 80:66393a7b209d 98 configuration. User can add here some code to deal with this error */
mbed_official 80:66393a7b209d 99 }
mbed_official 80:66393a7b209d 100 }
mbed_official 80:66393a7b209d 101
mbed_official 80:66393a7b209d 102 // MCU SLEEP mode
mbed_official 76:aeb1df146756 103 void sleep(void)
mbed_official 76:aeb1df146756 104 {
mbed_official 80:66393a7b209d 105 // Enable PWR clock
mbed_official 80:66393a7b209d 106 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
mbed_official 84:f54042cbc282 107
mbed_official 80:66393a7b209d 108 // Request to enter SLEEP mode with regulator ON
mbed_official 84:f54042cbc282 109 PWR_EnterSleepMode(PWR_Regulator_ON, PWR_SLEEPEntry_WFI);
mbed_official 76:aeb1df146756 110 }
mbed_official 76:aeb1df146756 111
mbed_official 80:66393a7b209d 112 // MCU STOP mode (Regulator in LP mode, LSI, HSI and HSE OFF)
mbed_official 76:aeb1df146756 113 void deepsleep(void)
mbed_official 76:aeb1df146756 114 {
mbed_official 76:aeb1df146756 115 // Enable PWR clock
mbed_official 76:aeb1df146756 116 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
mbed_official 76:aeb1df146756 117
mbed_official 80:66393a7b209d 118 // Enable Ultra low power mode
mbed_official 80:66393a7b209d 119 PWR_UltraLowPowerCmd(ENABLE);
mbed_official 80:66393a7b209d 120
mbed_official 80:66393a7b209d 121 // Enter Stop Mode
mbed_official 76:aeb1df146756 122 PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
mbed_official 80:66393a7b209d 123
mbed_official 80:66393a7b209d 124 // After wake-up from STOP reconfigure the system clock (HSI)
mbed_official 80:66393a7b209d 125 SetSysClock_HSI();
mbed_official 80:66393a7b209d 126
mbed_official 76:aeb1df146756 127 }