stm32/App/usart/usart.c

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#include "sys.h"
#include "usart.h"
#include "led.h"
//! 加入以下代码,支持prfintf函数,而不需要选择 use MicroLIB
#if 1
#pragma import(__use_no_semihosting)
//! 标准库需要的支持函数
struct __FILE
{
int handle;
};
FILE __stdout;
//! 定义 _sys_exit() 避免使用半主机模式
_sys_exit(int x)
{
x = x;
}
//! 重定义fputc函数
//! 循环发送,直到发送完毕
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);
USART1->DR = (u8) ch;
return ch;
}
#endif
/*使用microLibd的方法*/
/*
int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (uint8_t) ch);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}
return ch;
}
int GetKey (void) {
while (!(USART1->SR & USART_FLAG_RXNE));
return ((int)(USART1->DR & 0x1FF));
}
*/
//! 串口2,3数据接收和缓冲buffer
u8 USART2_RX_BUF[10]={0},USART3_RX_BUF[75]={0},number_USART2=0,number_USART3=0;
//! 串口2,3数据接收完成标志
u16 USART2_RX_STA=0,USART3_RX_STA=0;
//! 串口数据接收buffer
u8 USART1_RX_BUF[7],number_USART1=0;
//! 串口1接收状态标志
u16 USART1_RX_STA=0;
//********************************************************************//
//! 函数名:uart1_init
//! 功能:串口1初始化接收噪音传感器数据
//! 输入:bound:串口波特率
//! 输出:none
//********************************************************************//
void uart1_init(u32 bound){
//! 串口GPIO初始化
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//! 使能串口1,GPIO1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
//! USART1_TX GPIOA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//! 复用推挽输出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
//! 初始化PA.9
GPIO_Init(GPIOA, &GPIO_InitStructure);
//! USART1_RX GPIOA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
//! 浮空输入
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
//! 初始化PA.10
GPIO_Init(GPIOA, &GPIO_InitStructure);
//! Usart1 NVIC 中断优先级配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
//! 抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
//! 子优先级1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
//! 使能IRQ通道
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//! 初始化VIC寄存器
NVIC_Init(&NVIC_InitStructure);
//! USART1初始化
//! 波特率
USART_InitStructure.USART_BaudRate = bound;
//! 8位数据格式
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
//! 一个停止位
USART_InitStructure.USART_StopBits = USART_StopBits_1;
//! 无奇偶校验位
USART_InitStructure.USART_Parity = USART_Parity_No;
//! 无硬件数据流控制
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
//! 收发模式
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
//! 初始化串口1
USART_Init(USART1, &USART_InitStructure);
//! 清除串口1中断标志
USART_ClearFlag(USART1,USART_FLAG_TC);
//! 开启串口接收中断
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//! 使能串口1
USART_Cmd(USART1, ENABLE);
}
//********************************************************************//
//! 函数名:USART1_IRQHandler
//! 功能:串口1中断服务函数接收噪音传感器数据
//! 输入:none
//! 输出:none
//********************************************************************//
void USART1_IRQHandler(void)
{
u8 temp;
if(USART_GetITStatus(USART1, USART_IT_RXNE)==SET)
{
temp=USART_ReceiveData(USART1);
//! 帧头(可能有数据等于帧头而接收出错的风险)
if((temp==0XBB)||(number_USART1>0))
{
USART1_RX_BUF[number_USART1++]=temp;
{
//! 一帧6字节
if((number_USART1==6)&&(USART1_RX_BUF[2]==0x01))
{
USART1_RX_STA=1;
number_USART1=0;
}
}
}
}
}
//********************************************************************//
//! 函数名:uart2_init
//! 功能:串口2初始化接收pm2.5传感器数据
//! 输入:bound波特率
//! 输出:none
//********************************************************************//
void uart2_init(u32 bound)
{
//! GPIO初始化结构体
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//! 使能GPIOA和USART2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
//! USART2_TX GPIOA.2初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//! USART2_RX GPIOA.3初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//! USART2 NVIC 中断优先级配置
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
//! 抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
//! 子优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
//! IRQ通道使能
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//! 根据指定参数初始化VIC寄存器
NVIC_Init(&NVIC_InitStructure);
//! USART2 初始化设置
//! 串口波特率配置
USART_InitStructure.USART_BaudRate = bound;
//! 8位数据长度数据格式
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
//! 1位停止位
USART_InitStructure.USART_StopBits = USART_StopBits_1;
//! 无奇偶效验位
USART_InitStructure.USART_Parity = USART_Parity_No;
//! 无硬件数据流控制
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
//! 收发模式
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
//! 初始化串口2
USART_Init(USART2, &USART_InitStructure);
//! 清除串口2中断标志
USART_ClearFlag(USART2,USART_FLAG_TC);
//! 使能中断
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
//! 使能串口
USART_Cmd(USART2, ENABLE);
}
//********************************************************************//
//! 函数名:USART2_IRQHandler
//! 功能:串口2中断服务函数,pm2.5数据接收
//! 输入:none
//! 输出:none
//********************************************************************//
void USART2_IRQHandler(void)
{
u8 temp;
if(USART_GetITStatus(USART2, USART_IT_RXNE)==SET)
{
temp=USART_ReceiveData(USART2);
//! 帧头0xff;(数据有接收出错的风险)
if((temp==0XFF)||(number_USART2>0))
{
USART2_RX_BUF[number_USART2++]=temp;
{
//! 一帧数据9字节
if(number_USART2==9)
{
USART2_RX_STA=1;
number_USART2=0;
}
}
}
}
}
//********************************************************************//
//! 函数名:uart3_init
//! 功能:串口3初始化;
//! 输入:none
//! 输出:none
//********************************************************************//
void uart3_init(u32 bound)
{
//! GPIO初始化结构体
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//! 开启GPIOB和USART3时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
//! USART3_TX GPIOB.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//! USART3_RX GPIOB.11
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//! Usart3 NVIC 中断优先级配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
//! 抢占优先级1
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;
//! 子优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
//! IRQ通道使能
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//! 根据指定参数初始化VIC寄存器
NVIC_Init(&NVIC_InitStructure);
//! USART3初始化
//! 波特率配置
USART_InitStructure.USART_BaudRate = bound;
//! 8位数据长度格式
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
//! 停止位1位
USART_InitStructure.USART_StopBits = USART_StopBits_1;
//! 无奇偶校验位
USART_InitStructure.USART_Parity = USART_Parity_No;
//! 无硬件数据流控制
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
//! 收发模式
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
//! 初始化串口3
USART_Init(USART3, &USART_InitStructure);
//! 清除串口3中断标志
USART_ClearFlag(USART3,USART_FLAG_TC);
//! 开启串口3接收中断
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
//! 使能串口3
USART_Cmd(USART3, ENABLE);
}
//********************************************************************//
//! 函数名:USART3_IRQHandler
//! 功能:串口3中断服务函数;
//! 输入:none
//! 输出:none
//********************************************************************//
void USART3_IRQHandler(void)
{
u8 Res=0;
if(USART_GetITStatus(USART3, USART_IT_RXNE)==SET)
{
Res=USART_ReceiveData(USART3);
if((Res=='{')||(number_USART3>0))
{
//! 读取数据到buffer
USART3_RX_BUF[number_USART3++] =Res;
//! 数据长度小于75字节并且以"}"结束,所以使用"}"判断数据是否接收完毕
if((Res=='}')||(number_USART3==75))
{
USART3_RX_STA=1;
number_USART3=0;
}
}
}
}