#include "stm32f10x.h"
#include <stdio.h>
#include <stdarg.h>

void Usart2_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	USART_DeInit(USART2);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	USART_InitTypeDef USART_InitStruture;
	USART_InitStruture.USART_BaudRate = 115200;
	USART_InitStruture.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStruture.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	USART_InitStruture.USART_Parity = USART_Parity_No;
	USART_InitStruture.USART_StopBits = USART_StopBits_1;
	USART_InitStruture.USART_WordLength = USART_WordLength_8b;
	
	USART_Init(USART2, &USART_InitStruture);
	
	USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVIC_InitStructure);
	
	
	
	USART_Cmd(USART2, ENABLE);
	
}