#include

//加入以下代碼,支持printf函數(shù),而不需要選擇use MicroLIB   

#if 1

#pragma import(__use_no_semihosting)             

//標(biāo)準(zhǔn)庫需要的支持函數(shù)                 

struct __FILE 

{ 

int handle; 

}; 

FILE __stdout;       

//定義_sys_exit()以避免使用半主機模式    

void _sys_exit(int x) 

{ 

x = x; 

}  

//重定義fputc函數(shù) 

int fputc(int ch, FILE *f)

{      

while((USART1->SR&0X40)==0);

USART1->DR = (u8) ch;      

return ch;

}

#endif 

void uart_init(u32 bound)

{

//GPIO端口設(shè)置

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA時鐘

//USART1_TX   GPIOA.9

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出

GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9

//USART1_RX   GPIOA.10初始化

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空輸入

GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  

//USART 初始化設(shè)置

USART_InitStructure.USART_BaudRate = bound;//串口波特率

USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長為8位數(shù)據(jù)格式

USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個停止位

USART_InitStructure.USART_Parity = USART_Parity_No;//無奇偶校驗位

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無硬件數(shù)據(jù)流控制

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發(fā)模式

USART_Init(USART1, &USART_InitStructure); //初始化串口1

USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);//開啟串口接受中斷

USART_Cmd(USART1, ENABLE);                    //使能串口1 

}