单片机和虚拟机Linux双向通信

昨天说好的双向通信的代码，今天终于想通了。linux通过串口向单片机返回一个信号量，单片机通过这个信号量，启动led灯。

下面把代码贡献出来：

单片机端CC2530：

/* ************************************************ *Name : serial                                 * *Date : 2015-04-30                             * *Author : Sniper                               * *Aim : serial port send the message to linux   * *      and linux return the signal to turn on  * *      led.                                    * ************************************************ */#include "ioCC2530.h"#include <string.h>#define uchar unsigned char#define led    P1_1uchar receive_message;uchar Recdata[]="Hello Linux";void initclk(void){   SLEEPCMD&= ~0X04;   CLKCONCMD = 0X10;   while(CLKCONSTA!=0X10);   SLEEPCMD = 0X04; //关闭不用的RC振荡器   }   void inituart(void){  IEN0|=0x84;//总中断，接收中断使能  U0CSR|=0xc0;//UART模式，允许接收    U0GCR=10;  U0BAUD=59;}void initio(void){ P0SEL|=0x0c; }/* *Uart Send the message */void UartTX_Send_String(uchar *Data,int len){  int j;  for(j=0;j<len;j++)  {    U0DBUF = *Data++;    while(UTX0IF == 0);    UTX0IF = 0;  }}/* *send the message and receive the signal to turnning on the led */void main(void){  initio();  initclk();  inituart();  UartTX_Send_String(Recdata,30);  if(receive_message != ' ')  {    P1SEL &=~0x02;    P1DIR |= 0x02;    while(1)      led=0;  }  while(1)  {      }}/* *interupt receive the signal */#pragma vector=URX0_VECTOR__interrupt void UART0_IRQ(void){  receive_message = U0DBUF; URX0IF=0; //U0DBUF = receive_message; while(!UTX0IF); UTX0IF=0;}

linux端的代码：

/* ************************************************* *Name : Serial_communication.c            *  *Date : 2015-04-29                        * *Author : Sniper                          * *Aim : make the CC2530 single chip and    * *      Linux (CentOS) communication.      * *      Linux receive and print the message* ************************************************* */#include <stdio.h>#include <stdlib.h> #include <unistd.h>  #include <sys/types.h>#include <sys/stat.h>#include <fcntl.h> /* *terminal device header file */#include <termios.h>#include <errno.h>#include <string.h>/* *struct termios *struct termios{unsigned short c_iflag; //输入模式标志unsigned short c_oflag; //输出模式标志unsigned short c_cflag; //控制模式标志unsigned short c_lflag; //区域模式标志或本地模式标志或局部模式unsigned char c_line; //行控制line discipline unsigned char c_cc[NCC]; // 控制字符特性}; */ #defineSERIAL_PORT"/dev/ttyUSB0"//串口地址#definePORT_SPEED38400//串口波特率#defineDATABITS8//数据位#defineSTOPBITS1//停止位#definePARITY'n'//校验方式 （不校验）int setSpeed(int, int, struct termios*);int setParity(int, int, int, int, struct termios);int openPort(void);int init(void);void readPort(int);/* *main function */int main(){char *quit = (char*)malloc(sizeof(char*));int fd;char write_buf[256];memset(write_buf,'\0',sizeof(write_buf));fd = init();//初始化端口设置printf("configure complete\n"); printf("start send and receive data...\n");while(1){    readPort(fd);}close(fd);}/* *receive the message from the single chip and send the signal to single chip */void readPort(int fd){int i;int len;int n; char read_buf[256];char return_message[100];memset(read_buf,'\0',sizeof(read_buf));memset(return_message,'\0',sizeof(return_message));strcpy(return_message,"Hello CC2530");while(1){bzero(read_buf, sizeof(read_buf)); while((n = read(fd, read_buf, sizeof(read_buf))) > 0)printf("%s\n", read_buf);/* *return message and start the buzzer */if(strcmp(read_buf,"Signal") == 0){n=write(fd,return_message,sizeof(return_message));if(n>0)printf("Message has been written!\n");}}}/* *init serial port *1 failure, 0 success */int init(void){int fd;struct termios opt;//定义termios结构//打开串口fd = openPort();//设置波特率if(setSpeed(fd, PORT_SPEED, &opt) == 1){printf("setSpeed failed!\n");exit(1);}//设置数据位、停止位和校验位if(setParity(fd, DATABITS, STOPBITS, PARITY, opt) == 1){printf("setParity failed!\n");exit(1);} if(tcsetattr(fd, TCSANOW, &opt) != 0)//TCSANOW：不等数据传输完毕就立即改变属性。{//TCSADRAIN：等待所有数据传输结束才改变属性。perror("serial error");return -1;}return fd;}/* *openPort  function *1 failure, 0 success */int openPort(){int fd;/* *serial address is /dev/ttyUSB*, open the serial address */fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY |O_NDELAY);     if(fd == -1)  {perror("open serial failed!\n");  exit(1);  }      return fd;}/* *setSpeed   *SetSpeed（38400, 19200, 9600, 4800, 2400, 1200, 300） *  1 failure, 0 success */int setSpeed(int fd, int speed, struct termios *Opt){    int i;    if(tcgetattr(STDIN_FILENO, &Opt) != 0)    {        perror("tcgetattr fd\n");        return 1;    }        /*     *set speed     */tcflush(fd, TCIOFLUSH);cfsetispeed(&Opt, speed);cfsetospeed(&Opt, speed);//set ways of receive if(tcsetattr(fd, TCSANOW, &Opt) != 0){perror("tcsetattr fd");return 1;}tcflush(fd, TCIOFLUSH);      return 0;}/* *setParity  *set the data bit,stop bit and check bit * 1 failure, 0 success */int setParity(int fd, int databits, int stopbits, int parity, struct termios Opt){if(tcgetattr(fd, &Opt) != 0){perror("tcgetattr fd");return 1;}Opt.c_cflag |= (CLOCAL | CREAD);       /* *Data bit */Opt.c_cflag &= ~CSIZE;Opt.c_cflag |= CS8;/* *check bit  */Opt.c_cflag &= ~PARENB;        Opt.c_iflag &= ~INPCK;          /* *stop bit */Opt.c_cflag &= ~CSTOPB;Opt.c_cflag |= (CLOCAL | CREAD);Opt.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);Opt.c_oflag &= ~OPOST;//OPOST ：启用具体实现自行定义的输出处理。Opt.c_oflag &= ~(ONLCR | OCRNL);    //OCRNL ：将输出中的回车映射为新行符  //ONLCR ：(XSI) 将输出中的新行符映射为回车-换行。Opt.c_iflag &= ~(ICRNL | INLCR);//ICRNL :将输入中的回车翻译为新行 (除非设置了 IGNCR)(否则当输入信号有 CR 时不会终止输入)。 //INLCR :将输入中的 NL 翻译为 CR。（将收到的换行符号转换为Return）Opt.c_iflag &= ~(IXON | IXOFF | IXANY);//IXON :启用输出的 XON/XOFF 流控制。//IXOFF :启用输入的 XON/XOFF 流控制。//IXANY :(不属于 POSIX.1；XSI) 允许任何字符来重新开始输出。tcflush(fd, TCIFLUSH);//清空输入缓存//MIN = 0 , TIME =0; 有READ立即回传否则传回 0,不读取任何字元Opt.c_cc[VTIME] = 0;        Opt.c_cc[VMIN] = 0;        if(tcsetattr(fd, TCSANOW, &Opt) != 0)//设置数据接收方式{perror("tcsetattr fd");return 1;}return 0;}

其实可以看出，我只需要向/dev/ttyUSB0中写入数据，单片机的硬件部件就可以自动读取，这个过程是硬件自己完成的。今天才反应过来这一点，有点慢啊!~具体的使用过程和上一篇一样!