53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
#include "printf.h"
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int fputc(int ch,FILE *p) //函数默认的，在使用printf函数时自动调用
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{
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USART_SendData(USART1,(u8)ch);
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while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
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return ch;
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}
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/*******************************************************************************
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* 函 数 名 : printf_init
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* 函数功能 : IO端口及串口1，时钟初始化函数
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* 输 入 : 无
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* 输 出 : 无
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*******************************************************************************/
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void printf_init() //printf初始化
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{
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GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量，用来初始化GPIO
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NVIC_InitTypeDef NVIC_InitStructure; //中断结构体定义
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USART_InitTypeDef USART_InitStructure; //串口结构体定义
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1|RCC_APB2Periph_AFIO,ENABLE);
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GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//TX
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GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA,&GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//RX
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GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA,&GPIO_InitStructure);
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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USART_InitStructure.USART_BaudRate=9600; //波特率设置为9600
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USART_InitStructure.USART_WordLength=USART_WordLength_8b;
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USART_InitStructure.USART_StopBits=USART_StopBits_1;
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USART_InitStructure.USART_Parity=USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
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USART_Init(USART1,&USART_InitStructure);
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USART_Cmd(USART1, ENABLE);
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//使能或者失能指定的USART中断 接收中断
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USART_ClearFlag(USART1,USART_FLAG_TC);//清除USARTx的待处理标志位
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}
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