#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_usart.h"
#include "stdio.h"
static GPIO_InitTypeDef GPIO_InitStructure;
static USART_InitTypeDef USART_InitStructure;
static NVIC_InitTypeDef NVIC_InitStructure;
void delay_us(uint32_t nus)
{
uint32_t temp;
SysTick->LOAD =SystemCoreClock/8/1000000*nus; //时间加载
SysTick->VAL =0x00; //清空计数器
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //使能滴答定时器开始倒数
do
{
temp=SysTick->CTRL;
}while((temp&0x01)&&!(temp&(1<<16))); //等待时间到达
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
void delay_ms(uint16_t nms)
{
uint32_t temp;
SysTick->LOAD=SystemCoreClock/8/1000*nms; //时间加载(SysTick->LOAD为24bit)
SysTick->VAL =0x00; //清空计数器
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //能滴答定时器开始倒数
do
{
temp=SysTick->CTRL;
}while((temp&0x01)&&!(temp&(1<<16))); //等待时间到达
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
void LED_Init(void)
{
//使能GPIOE，GPIOF时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE | RCC_AHB1Periph_GPIOF, ENABLE);
//GPIOF9,F10初始化设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //LED0和LED1对应IO口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //普通输出模式，
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出，驱动LED需要电流驱动
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOF, &GPIO_InitStructure); //初始化GPIOF，把配置的数据写入寄存器
//GPIOE13,PE14初始化设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14; //LED2和LED3对应IO口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //普通输出模式
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOE, &GPIO_InitStructure); //初始化GPIOE，把配置的数据写入寄存器
GPIO_SetBits(GPIOF,GPIO_Pin_9 | GPIO_Pin_10); //GPIOF9,PF10设置高，灯灭
GPIO_SetBits(GPIOE,GPIO_Pin_13 | GPIO_Pin_14);
}
void USART1_Init(uint32_t baud)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //使能USART1时钟
//串口1对应引脚复用映射
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
//USART1端口配置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9与GPIOA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA9，PA10
//USART1 初始化设置
USART_InitStructure.USART_BaudRate = baud; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART1, &USART_InitStructure); //初始化串口1
USART_Cmd(USART1, ENABLE); //使能串口1
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启相关中断
//Usart1 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //串口1中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3; //抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
}
void USART3_Init(uint32_t baud)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE); //使能GPIOB时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //使能USART3时钟
//串口3对应引脚复用映射
GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_USART3); //GPIOB10复用为USART3
GPIO_PinAFConfig(GPIOB,GPIO_PinSource11,GPIO_AF_USART3); //GPIOB11复用为USART3
//USART1端口配置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; //GPIOB10与GPIOB11
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOB,&GPIO_InitStructure); //初始化PB10，PB11
//USART1 初始化设置
USART_InitStructure.USART_BaudRate = baud; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART3, &USART_InitStructure); //初始化串口3
USART_Cmd(USART3, ENABLE); //使能串口3
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); //开启相关中断
//Usart3 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; //串口3中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3; //抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
}
//重定义fputc
int fputc(int ch,FILE *f)
{
USART_SendData(USART1,ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
return ch;
}
void usart1_send_bytes(uint8_t *pbuf,uint32_t len)
{
while(len--)
{
USART_SendData(USART1,*pbuf++);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
}
}
void usart1_send_str(char *pbuf)
{
while(pbuf && *pbuf)
{
USART_SendData(USART1,*pbuf++);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
}
}
void usart3_send_bytes(uint8_t *pbuf,uint32_t len)
{
while(len--)
{
USART_SendData(USART3,*pbuf++);
while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);
}
}
void usart3_send_str(char *pbuf)
{
while(pbuf && *pbuf)
{
USART_SendData(USART3,*pbuf++);
while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);
}
}
void ble_set_config(void)
{
//配置模块的名字
usart3_send_str("AT+NAMEHELLO
");
delay_ms(500);
}
int main(void)
{
LED_Init();
//系统定时器初始化，时钟源来自HCLK，且进行8分频，
//系统定时器时钟频率=168MHz/8=21MHz
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
//设置中断优先级分组2
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//串口1,波特率115200bps,开启接收中断
USART1_Init(115200);
printf("hello ble at test
");
//串口3,波特率9600bps,开启接收中断,蓝牙模块出厂设置为9600bps
USART3_Init(9600);
ble_set_config();
while(1)
{
}
}
void USART1_IRQHandler(void) //串口1中断服务程序
{
uint8_t d;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断
{
//接收数据
d = USART_ReceiveData(USART1);
//发送数据
usart3_send_bytes(&d,1);
}
}
void USART3_IRQHandler(void) //串口3中断服务程序
{
uint8_t d;
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) //接收中断
{
//接收数据
d = USART_ReceiveData(USART3);
//发送数据
usart1_send_bytes(&d,1);
}
}
