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发表于 2011-11-9 15:36:26
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/* Includes ------------------------------------------------------------------*/
#include "stm32l1xx.h"
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* System Clocks Configuration **********************************************/
RCC_Configuration();
GPIO_Configuration();
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the RTC Wakeup Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* RTC Wakeup Interrupt Generation: Clock Source: RTCDiv_16, Wakeup Time Base: 4s */
RTC_WakeUpClockConfig(RTC_WakeUpClock_RTCCLK_Div16);
RTC_SetWakeUpCounter(0x1FFF);
/* Enable the Wakeup Interrupt */
RTC_ITConfig(RTC_IT_WUT, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, DISABLE);
PWR_UltraLowPowerCmd(ENABLE);
PWR_EnterSTOPMode(PWR_Regulator_LowPower,PWR_STOPEntry_WFI);
// RCC_MCOConfig(RCC_MCOSource_LSE, RCC_MCODiv_1);
//
while (1)
{
}
}
/**
* @brief Configures the different system clocks.
* @param None
* @retval None
*/
void RCC_Configuration(void)
{
/* Enable The PWR Clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_RTCAccessCmd(ENABLE);
/*!< LSE Enable */
RCC_LSEConfig(RCC_LSE_ON);
/*!< Wait till LSE is ready */
while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{}
/*!< LCD Clock Source Selection */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
}
/**
* @brief Configures the different GPIO ports.
* @param None
* @retval None
*/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
///* Enable HSI */
//RCC_HSICmd(ENABLE);
/* Enable the GPIOA peripheral */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Output the system clock on MCO pin (PA.08) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_Init(GPIOD, &GPIO_InitStructure);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/
以下是RTC中断
void RTC_WKUP_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_WUT) != RESET)
{
/* Enable HSI */
RCC_HSICmd(ENABLE);
/* Enable the GPIOA peripheral */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Output the system clock on MCO pin (PA.08) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_MCOConfig(RCC_MCOSource_LSE, RCC_MCODiv_1);
PWR_UltraLowPowerCmd(ENABLE);
PWR_EnterSTOPMode(PWR_Regulator_LowPower,PWR_STOPEntry_WFI);
RTC_ClearITPendingBit(RTC_IT_WUT);
}
}
运行起来PA8测不出输出频率，电流表测到的电流为48uA,
注：电路上只焊接了单片机及其必要的元件（电阻，电容，晶振），外加的外围器件都没焊接 |
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