1、串口一的配置(初始化+中断配置+中断接收函数)html
/*=============================================================================== Copyright: Version: Author: Date: 2017/11/3 Description: 配置独立看门狗初始化函数,在主函数中运行IWDG_ReloadCounter进行喂狗主函数必须在4s内进行一次喂狗否则系统会复位; 函数功能是将接收固定长度的字符串,并将接收后的字符串经过串口发送出去 revise Description: ===============================================================================*/ #include "stm32f10x_usart.h" #include "stm32f10x.h" #include "stm32f10x_iwdg.h" u8 USART1_RX_BUF[21]; u8 USART1_RX_CNT=0; void IWDG_Configuration(void); void Usart1_Init(u32 bound) { //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC, ENABLE);//使能USART1,GPIOA,C时钟 //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; //复用推挽输出 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;//浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10 //Usart1 NVIC 配置 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级,2位响应优先级 0-3; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; 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 //USART 初始化设置 USART_InitStructure.USART_BaudRate = bound;//串口波特率 USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式 USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个中止位 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_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断 USART_Cmd(USART1, ENABLE); //使能串口1 } /** * USART1发送len个字节. * buf:发送区首地址 * len:发送的字节数(为了和本代码的接收匹配,这里建议不要超过64个字节) **/ void USART1_Send_Data(u8 *buf,u16 len) { u16 t; GPIO_SetBits(GPIOC,GPIO_Pin_9); // RS485_TX_EN=1; //设置为发送模式 for(t=0;t<len;t++) //循环发送数据 { while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET); //循环发送,直到发送完毕 USART_SendData(USART1,buf[t]); } while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET); GPIO_ResetBits(GPIOC,GPIO_Pin_9); // RS485_TX_EN=0; //设置为接收模式 } void main(void) { Usart1_Init(9600);//串口1波特率设置为9600 IWDG_Configuration(); while(1) { IWDG_ReloadCounter();//4s内必须喂狗否则复位 if(USART1_RX_CNT==21)//数据接收完成 { USART1_RX_CNT=0;//指针复位 //将接收到的数据发送出去 USART1_Send_Data(USART1_RX_BUF,21);//经过串口1将接收到的固定长度字符发送出去 } } } /** * 接收指定长度的字符串 * 好比接收固定大小为21个字节的字符串 **/ void USART1_IRQHandler(void) //串口1中断服务程序 { u8 Res; if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) { Res =USART_ReceiveData(USART1); //读取接收到的数据 if(USART1_RX_CNT<21)//对于接收指定长度的字符串 { USART1_RX_BUF[USART1_RX_CNT]=Res; //记录接收到的值 USART1_RX_CNT++; //接收数据增长1 } } //溢出-若是发生溢出须要先读SR,再读DR寄存器则可清除不断入中断的问题 if(USART_GetFlagStatus(USART1,USART_FLAG_ORE) == SET) { USART_ReceiveData(USART1); USART_ClearFlag(USART1,USART_FLAG_ORE); } USART_ClearFlag(UART1,USART_IT_RXNE); //必定要清除接收中断 } /*=============================================================================== Copyright: Version: Author: Date: 2017/11/3 Description:配置独立看门狗初始化函数,在主函数中运行IWDG_ReloadCounter进行喂狗 主函数必须在4s内进行一次喂狗否则系统会复位 revise Description: ===============================================================================*/ void IWDG_Configuration(void) { /* 写入0x5555,用于容许狗狗寄存器写入功能 */ IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable); /* 狗狗时钟分频,40K/256=156HZ(6.4ms)*/ IWDG_SetPrescaler(IWDG_Prescaler_256); /* 喂狗时间 5s/6.4MS=781 .注意不能大于0xfff*/ IWDG_SetReload(781);//781(5s时间) IWDG_SetReload(3125);//781(20s时间) IWDG_Enable();//启用定时器 IWDG_ReloadCounter(); }
2、串口二的配置(初始化+中断配置+中断接收函数)数组
/*=============================================================================== Copyright: Version: Author: Date: 2017/11/3 Description: 函数功能是将接收固定长度的字符串,并将接收后的字符串经过串口发送出去 revise Description: ===============================================================================*/ #include "stm32f10x_usart.h" #include "stm32f10x.h" #include "stm32f10x_iwdg.h" u8 USART2_RX_BUF[250]; u8 USART2_RX_CNT=0; u16 USART2_RX_STA=0; //接收状态标记 void Usart2_Init(u32 bound) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; //|RCC_APB2Periph_AFIO RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//使能GPIOA时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2时钟 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽 GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure); RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);//复位串口2 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);//中止复位 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级,2位响应优先级 0-3; NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //使能串口2中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //先占优先级2级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级2级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能外部中断通道 NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器 USART_InitStructure.USART_BaudRate = bound;//波特率设置 USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位数据长度 USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个中止位 USART_InitStructure.USART_Parity = USART_Parity_No;///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(USART2, &USART_InitStructure); ; //初始化串口 USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断 USART_Cmd(USART2, ENABLE); //使能串口 } /** * USART2发送len个字节. * buf:发送区首地址 * len:发送的字节数(为了和本代码的接收匹配,这里建议不要超过64个字节) **/ void USART2_Send_Data(u8 *buf,u16 len) { u16 t; for(t=0;t<len;t++) //循环发送数据 { while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET); USART_SendData(USART2,buf[t]); } while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET); } /** * 这也是一个接收函数,能够用,也能够用下面main函数的方法调用 * USART2查询接收到的数据 * buf:接收缓存首地址 * len:读到的数据长度 **/ void USART2_Receive_Data(u8 *buf) { u8 rxlen=USART2_RX_CNT; u8 i=0; delay_ms(10); //等待10ms,连续超过10ms没有接收到一个数据,则认为接收结束 while(rxlen!=USART2_RX_CNT) { rxlen=USART2_RX_CNT; delay_ms(10); } for(i=0;i<(USART2_RX_CNT);i++) { buf[i] = USART2_RX_BUF[i]; USART2_RX_BUF[i] = 0; } USART2_RX_CNT=0; //清零 } void main(void) { Usart2_Init(9600);//串口1波特率设置为9600 while(1) { if(USART2_RX_STA)//数据接收完成 { USART2_RX_STA=0; //将接收到的数据发送出去 USART2_Send_Data(USART2_RX_BUF,USART2_RX_CNT);//经过串口1将接收到的固定长度字符发送出去 USART2_RX_CNT=0;//指针复位 } } } void USART2_IRQHandler(void) { u8 res; if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //接收到数据 { res =USART_ReceiveData(USART2); //读取接收到的数据 if(USART2_RX_STA==0) { USART2_RX_BUF[USART2_RX_CNT] = res; //记录接收到的值 //当数据结尾收到0xA0和0xA1表明数据接收完成,是一串完整的数据 if(USART2_RX_BUF[USART2_RX_CNT-1]==0xA0&&USART2_RX_BUF[USART2_RX_CNT]==0xA1) USART2_RX_STA=1;//表示接收数据结束 USART2_RX_CNT++; //接收数据增长1 } } } //溢出-若是发生溢出须要先读SR,再读DR寄存器则可清除不断入中断的问题 if(USART_GetFlagStatus(USART2,USART_FLAG_ORE) == SET) { USART_ReceiveData(USART2); USART_ClearFlag(USART2,USART_FLAG_ORE); } USART_ClearFlag(UART2,USART_IT_RXNE); //必定要清除接收中断 }
3、串口三的配置(初始化+中断配置+中断接收函数)缓存
/*=============================================================================== Copyright: Version: Author: Date: 2017/11/3 Description: 函数功能是将接收固定长度的字符串,并将接收后的字符串经过串口发送出去 经过滴答定时器方式获取数据 revise Description: ===============================================================================*/ #include "stm32f10x_usart.h" #include "stm32f10x.h" #define USART3_TIMEOUT_Setting 800 //(ms) u8 USART3_RX_BUF[250]; u16 USART3_RX_CNT=0; u16 USART3_RX_TIMEOUT=0; //接收状态标记 void Timer1CountInitial(void); void USART3_Init(u32 baud) { USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; //声明一个结构体变量,用来初始化GPIO //使能串口的RCC时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE); //使能UART3所在GPIOB的时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //串口使用的GPIO口配置 // Configure USART3 Rx (PB.11) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); // Configure USART3 Tx (PB.10) as alternate function push-pull 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); //配置串口 USART_InitStructure.USART_BaudRate = baud; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; // Configure USART3 USART_Init(USART3, &USART_InitStructure);//配置串口3 // Enable USART3 Receive interrupts 使能串口接收中断 USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); // Enable the USART3 USART_Cmd(USART3, ENABLE);//使能串口3 //串口中断配置 //Configure the NVIC Preemption Priority Bits NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // Enable the USART3 Interrupt NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void USART3_Sned_Char(u8 temp) { USART_SendData(USART3,(u8)temp); while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET); } void USART3_Sned_Char_Buff(u8 buf[],u32 len) { u32 i; for(i=0;i<len;i++) USART3_Sned_Char(buf[i]); } void main(void) { Timer1CountInitial(); Usart3_Init(9600);//串口1波特率设置为9600 while(1) { if(USART3_RX_TIMEOUT==USART3_TIMEOUT_Setting) { USART3_RX_TIMEOUT=0; USART3_Sned_Char_Buff(USART3_RX_BUF,USART3_RX_CNT);//将接收到的数据发送出去 USART3_RX_CNT=0; } } } void USART3_IRQHandler(void) //串口3中断服务程序 { u8 Res; if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) { USART3_RX_TIMEOUT=0; USART3_RX_BUF[USART3_RX_CNT++] = USART_ReceiveData(USART3); //读取接收到的数据 } //溢出-若是发生溢出须要先读SR,再读DR寄存器则可清除不断入中断的问题 if(USART_GetFlagStatus(USART3,USART_FLAG_ORE) == SET) { USART_ReceiveData(USART3); USART_ClearFlag(USART3,USART_FLAG_ORE); } USART_ClearITPendingBit(USART3, USART_IT_RXNE); } //放到主函数的初始化中初始化 void Timer1CountInitial(void) { //定时=36000/72000x2=0.001s=1ms; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; /////////////////////////////////////////////////////////////// RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); TIM_TimeBaseStructure.TIM_Period = 100-1;//自动重装值(此时改成10ms) TIM_TimeBaseStructure.TIM_Prescaler = 7200-1;//时钟预分频 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频1 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); TIM_ClearFlag(TIM1,TIM_FLAG_Update); TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE); TIM_Cmd(TIM1, ENABLE); } void TIM1_UP_IRQHandler(void) { //TIM_TimeBaseStructure.TIM_Period = 100-1;//自动重装值(此时改成10ms) if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) { if(USART3_RX_TIMEOUT<USART3_TIMEOUT_Setting) USART3_RX_TIMEOUT++; } TIM_ClearITPendingBit(TIM1,TIM_IT_Update); }
4、串口四的配置(初始化+中断配置+中断接收函数)异步
注意串口四的中断优先级没有贴出来,和前面的三个同样的配置,为了避免占用过多的篇幅就不贴中断优先级配置了函数
/*=============================================================================== Copyright: Version: Author: Date: 2017/11/3 Description: 函数功能是将接收固定长度的字符串,并将接收后的字符串经过串口发送出去 经过滴答定时器方式获取数据 revise Description: ===============================================================================*/ #include "stm32f10x_usart.h" #include "stm32f10x.h" #define USART4_TIMEOUT_Setting 800 //(ms) u8 USART4_RX_BUF[250]; u16 USART4_RX_CNT=0; u16 USART2_RX_STA=0; //接收状态标记 void Systick_delay_init(u8 SYSCLK); u8 virtual_delay(u32 num,u8 unit); //通用异步收发器UART4 void UART4_Init(u32 bound) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; //used for USART3 full remap //GPIO_PinRemapConfig(GPIO_FullRemap_USART3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);//for UART4 //Configure RS485_TX_EN PIN GPIO_InitStructure.GPIO_Pin = RS485_TX_EN_PIN; //PC9端口配置 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(RS485_TX_EN_PORT, &GPIO_InitStructure); RS485_TX_EN=0; //设置485默认为接收模式 /* Configure USART Tx as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Configure USART Rx as input floating */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOC, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = bound; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No ; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(UART4, &USART_InitStructure); //USART_Init(USART3, &USART_InitStructure); /* Enable the USART */ USART_Cmd(UART4, ENABLE); USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);//开启串口接受中断 USART_ClearFlag(UART4,USART_FLAG_TC); } //USART1查询接收到的数据 //buf:接收缓存首地址 //len:读到的数据长度 void UART4_Receive_Data(u8 *buf) { u8 rxlen=21; u8 i=0; delay_ms(10); //等待10ms,连续超过10ms没有接收到一个数据,则认为接收结束 RS485_RX_FLAG = 0; if((UART4_RX_BUF[0]==0x01)&&(UART4_RX_BUF[1]==0x03)) { for(i=0;i<rxlen;i++) { buf[i]=UART4_RX_BUF[i]; UART4_RX_BUF[i] = 0; } RS485_RX_FLAG = 1; } UART4_RX_CNT=0; //清零 } //USART1发送len个字节. //buf:发送区首地址 //len:发送的字节数(为了和本代码的接收匹配,这里建议不要超过64个字节) void UART4_Send_Data(u8 *buf,u16 len) { u16 t; RS485_TX_EN=1; //设置为发送模式 for(t=0;t<len;t++) //循环发送数据 { while(USART_GetFlagStatus(UART4,USART_FLAG_TC)==RESET); //循环发送,直到发送完毕 USART_SendData(UART4,buf[t]); } while(USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET); RS485_TX_EN=0; //设置为接收模式 } void main(void) { Systick_delay_init(72); Usart4_Init(9600);//串口1波特率设置为9600 while(1) { if(USART2_RX_STA) { if(virtual_delay(USART4_TIMEOUT_Setting,MS))//超过800ms空闲则能够读取数据 { UART4_Send_Data(UART4_RX_BUF,UART4_RX_CNT); USART2_RX_STA=0; UART4_RX_CNT=0; } } } } void UART4_IRQHandler(void) //UART4 Receive Interrupt { u8 Res; if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾) { Res =USART_ReceiveData(UART4);//(USART1->DR); //读取接收到的数据 UART4_RX_BUF[UART4_RX_CNT&0XFF]=Res; //回传的数据存入数组,0X3F限制为64个数值 UART4_RX_CNT++; USART2_RX_STA=1; } if( USART_GetITStatus(UART4, USART_IT_TC) == SET ) { USART_ClearFlag(UART4, USART_FLAG_TC); } //溢出-若是发生溢出须要先读SR,再读DR寄存器则可清除不断入中断的问题 if(USART_GetFlagStatus(UART4,USART_FLAG_ORE) == SET) { USART_ReceiveData(UART4); USART_ClearFlag(UART4,USART_FLAG_ORE); } // USART_ITConfig(UART4, USART_IT_RXNE, DISABLE);//临时关闭接收中断 USART_ClearFlag(UART4,USART_IT_RXNE); //必定要清除接收中断 } //初始化延迟函数 //SYSTICK的时钟固定为HCLK时钟的1/8 //SYSCLK:系统时钟 void Systick_delay_init(u8 SYSCLK) { SysTick->CTRL&=0xfffffffb;//bit2清空,选择外部时钟 HCLK/8 // SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //选择外部时钟 HCLK/8 fac_us=SYSCLK/8; fac_ms=(u16)fac_us*1000; } /*=============================================================================== Author:peter pan Date: Description: 查询式分时或叫作轮询式(近似延时)。本函数是用于执行高效率场合的查询延时,可是一个for or while 循环中只能用一次。 revise Description: @ num : //分时查询的周期计数值 @ unit : //分时查询的周期单位 @@ParaValue : MS //周期单位为MS毫秒级 US //周期单位为US微秒级 @ virtual_delay_status : //静态变量 @@ParaValue : SET //SYSTICK正在占用中,请勿用 RESET //SYSTICK空闲,可使用 @ReValue : with zero mean Time non-arrive ,one representative Time arrived ,you can do task; ##example if(virtual_delay(1000,MS)) LedFlash(); //1000ms LED闪烁一下 ===============================================================================*/ u8 virtual_delay(u32 num,u8 unit) { u32 temp; if(virtual_delay_status==RESET) // SYSTICK空闲,可使用 { if(unit==MS) { SysTick->LOAD=(u32)num*Delay_SYSCLK*125;//时间加载(SysTick->LOAD为24bit) SysTick->VAL =0x00; //清空计数器 SysTick->CTRL=0x01 ; //开始倒数 }else if(unit==US) { SysTick->LOAD=num*Delay_SYSCLK/8; //时间加载 SysTick->VAL=0x00; //清空计数器 SysTick->CTRL=0x01 ; //开始倒数 } virtual_delay_status=SET; return 0; } else { //virtual_delay_status==SET SYSTICK被占用 temp=SysTick->CTRL; if(!(temp&0x01&&!(temp&(1<<16))))//等待时间到达 { SysTick->CTRL=0x00; //关闭计数器 SysTick->VAL =0X00; //清空计数器 virtual_delay_status=RESET; return 1; }else return 0; } }
原文地址:https://www.cnblogs.com/pertor/p/9488446.html 指针
感谢原做者!code