STOP状态下通过串口唤醒MCU

/*
STOP状态下通过串口唤醒MCU
唤醒机制：在MCU进入STOP状态后，不能直接通过UART等外设唤醒，
在MCU进入STOP前将RX脚设为EXTI模式，并使能对应的中断。 
*/
/***************************************************************************************
** 函数名称: main
** 功能描述: 起始入口
**--------------------------------------------------------------------------------------
** 修 改 人: 
** 日　  期: 
**--------------------------------------------------------------------------------------
****************************************************************************************/
int main(void) 
{ 
System_Init(); 
PWR_DeInit(); 
UART_Init(); 
Global_Variables_Init();
while(1) 
{ 
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI); 
} 
} 
/***************************************************************************************
** 函数名称: EXTIX_Init
** 功能描述: 把RX改为EXTI,允许中断
** 参    数: None
** 返 回 值: None       
** 作　  者: WEN(wenshijian4@163.com,QQ214490357)
** 日  　期: 2015年09月17日
**--------------------------------------------------------------------------------------
** 修 改 人: 
** 日　  期: 
**--------------------------------------------------------------------------------------
****************************************************************************************/
void EXTIX_Init(void) 
{ 
EXTI_InitTypeDef EXTI_InitStructure; 
NVIC_InitTypeDef NVIC_InitStructure; 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE); 
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource11); 
EXTI_InitStructure.EXTI_Line=EXTI_Line11;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; 
EXTI_InitStructure.EXTI_LineCmd = ENABLE; 
EXTI_Init(&EXTI_InitStructure); 
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQChannel; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02; 
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; 
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init(&NVIC_InitStructure); 
} 


/******************************************************************************* 
* Function Name : EXTI15_10_IRQHandler 
* Description : 位于stm32f10x_it.c
* Input : None 
* Output : None 
* Return : None 
*******************************************************************************/ 
void EXTI15_10_IRQHandler(void) 
{ 
EXTI_ClearITPendingBit(EXTI_Line11); 
NVIC_GenerateSystemReset(); 
} 
/***************************************************************************************
** 函数名称: PWR_EnterSTOPMode
** 功能描述: 调整寄存器，进入STOP模式
** 参    数: 
** 返 回 值: None       
** 作　  者: WEN(wenshijian4@163.com,QQ214490357)
** 日  　期: 2015年09月17日
**--------------------------------------------------------------------------------------
** 修 改 人: 
** 日　  期: 
**--------------------------------------------------------------------------------------
****************************************************************************************/
void PWR_EnterSTOPMode(u32 PWR_Regulator, u8 PWR_STOPEntry) 
{ 
u32 tmpreg = 0; 
EXTIX_Init(); 


/* Select the regulator state in STOP mode ---------------------------------*/ 
tmpreg = PWR->CR; 
/* Clear PDDS and LPDS bits */ 
tmpreg &= CR_DS_Mask; 
/* Set LPDS bit according to PWR_Regulator value */ 
tmpreg |= PWR_Regulator; 
/* Store the new value */ 
PWR->CR = tmpreg; 
/* Set SLEEPDEEP bit of Cortex System Control Register */ 
*(vu32 *) SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set; 
/* Select STOP mode entry --------------------------------------------------*/ 
if(PWR_STOPEntry == PWR_STOPEntry_WFI) 
{ 
/* Request Wait For Interrupt */ 
__WFI(); 
} 
else 
{ 
/* Request Wait For Event */ 
__WFE(); 
} 
} 
/***************************************************************************************
** 函数名称: UART_Init
** 功能描述: 串口初始化
** 参    数: None
** 返 回 值: None       
** 作　  者: WEN(wenshijian4@163.com,QQ214490357)
** 日  　期: 2015年09月17日
**--------------------------------------------------------------------------------------
** 修 改 人: 
** 日　  期: 
**--------------------------------------------------------------------------------------
****************************************************************************************/
void UART_Init(void) 
{ 
GPIO_InitTypeDef GPIO_InitStructure; 
USART_InitTypeDef USART_InitStructure; 
NVIC_InitTypeDef NVIC_InitStructure; 
/* Enable USART3 clock */ 
RCC_APB1PeriphClockCmd( RCC_APB1Periph_USART3, ENABLE); 
// GPIO Settings for USART3 
// PB10: TXD_ROOM 
GPIO_StructInit(&GPIO_InitStructure); 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; 
GPIO_Init(GPIOB, &GPIO_InitStructure); 
// PB11: RXD_ROOM 
GPIO_StructInit(&GPIO_InitStructure); 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; 
//GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; 
GPIO_Init(GPIOB, &GPIO_InitStructure); 


USART_DeInit(USART3); 
USART_InitStructure.USART_BaudRate =9600; 
USART_InitStructure.USART_WordLength = USART_WordLength_9b; 
USART_InitStructure.USART_StopBits = USART_StopBits_2; 
USART_InitStructure.USART_Parity = USART_Parity_Even; 
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; 
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; 
USART_Init(USART3, &USART_InitStructure); 
UartRxON(); 
// In initial state, waiting for indoor data... 
USART_ITConfig(USART3, USART_IT_TXE, DISABLE); 
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); 
UART_State=UART_RX; //0; // 0: received state 1: transmit state 
/* Enable the USART3 Interrupt */ 
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQChannel; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; 
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; 
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init(&NVIC_InitStructure); 
/* Enable USART3 */ 
USART_Cmd(USART3, ENABLE); 
}