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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx |
USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_Cmd(USART2, ENABLE);
/* DIR485_L; */
}

void USART2_IRQHandler(void)
{
u8 c;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
c=USART2->DR;
USART2_SendByte(c);
}

}

#include "stm32f10x.h"

volatile unsigned char c='s';
volatile unsigned int pwmval = 700;
volatile unsigned int CCR1_Val = 500;

void GPIO_Configuration()
{
GPIO_InitTypeDef GPIO_InitStructure;

//TIM2_PWM 핀 설정
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

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