230 lines
6.5 KiB
C++
230 lines
6.5 KiB
C++
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/times.h>
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#include <sys/types.h>
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#include <termios.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include<iostream>
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#define TIMEOUT_SEC(buflen,baud) (buflen*20/baud+2) //接收超时
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#define TIMEOUT_USEC 0
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#include "../include/dyp-a05/uart-ctrl.h"
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/*******************************************
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* 波特率转换函数（请确认是否正确）
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********************************************/
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static int convBaudRate(unsigned long int baudrate)
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{
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switch(baudrate){
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case 2400:
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return B2400;
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case 4800:
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return B4800;
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case 9600:
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return B9600;
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case 19200:
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return B19200;
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case 38400:
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return B38400;
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case 57600:
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return B57600;
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case 115200:
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return B115200;
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default:
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return B9600;
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}
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}
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/*******************************************
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* Setup serial attr
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* fdcom: 串口文件描述符，pportinfo: 待设置的端口信息（请确认）
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*
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********************************************/
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int uart_set(int fdcom, const pPortInfo_t pportinfo)
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{
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struct termios termios_old, termios_new;
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int baudrate, tmp;
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char databit, stopbit, parity, fctl;
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bzero(&termios_old, sizeof(termios_old));
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bzero(&termios_new, sizeof(termios_new));
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cfmakeraw(&termios_new);
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tcgetattr(fdcom, &termios_old); //get the serial port attributions
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/*------------设置端口属性----------------*/
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//baudrates
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baudrate = convBaudRate(pportinfo -> baudrate);
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cfsetispeed(&termios_new, baudrate); //填入串口输入端的波特率
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cfsetospeed(&termios_new, baudrate); //填入串口输出端的波特率
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termios_new.c_cflag |= CLOCAL; //控制模式，保证程序不会成为端口的占有者
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termios_new.c_cflag |= CREAD; //控制模式，使能端口读取输入的数据
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// 控制模式，flow control
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fctl = pportinfo-> fctl;
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switch(fctl){
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case 0:{
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termios_new.c_cflag &= ~CRTSCTS; //no flow control
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}break;
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case 1:{
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termios_new.c_cflag |= CRTSCTS; //hardware flow control
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}break;
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case 2:{
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termios_new.c_iflag |= IXON | IXOFF |IXANY; //software flow control
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}break;
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}
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//控制模式，data bits
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termios_new.c_cflag &= ~CSIZE; //控制模式，屏蔽字符大小位
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databit = pportinfo -> databit;
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switch(databit){
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case 5:
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termios_new.c_cflag |= CS5;
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case 6:
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termios_new.c_cflag |= CS6;
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case 7:
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termios_new.c_cflag |= CS7;
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default:
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termios_new.c_cflag |= CS8;
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}
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//控制模式 parity check
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parity = pportinfo -> parity;
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switch(parity){
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case 0:{
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termios_new.c_cflag &= ~PARENB; //no parity check
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}break;
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case 1:{
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termios_new.c_cflag |= PARENB; //odd check
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termios_new.c_cflag &= ~PARODD;
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}break;
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case 2:{
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termios_new.c_cflag |= PARENB; //even check
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termios_new.c_cflag |= PARODD;
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}break;
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}
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//控制模式，stop bits
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stopbit = pportinfo -> stopbit;
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if(stopbit == 2){
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termios_new.c_cflag |= CSTOPB; //2 stop bits
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}
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else{
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termios_new.c_cflag &= ~CSTOPB; //1 stop bits
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}
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//other attributions default
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termios_new.c_oflag &= ~OPOST; //输出模式，原始数据输出
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termios_new.c_cc[VMIN] = 1; //控制字符, 所要读取字符的最小数量
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termios_new.c_cc[VTIME] = 5; //控制字符, 读取第一个字符的等待时间 unit: (1/10)second
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tcflush(fdcom, TCIFLUSH); //溢出的数据可以接收，但不读
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tmp = tcsetattr(fdcom, TCSANOW, &termios_new); //设置新属性，TCSANOW：所有改变立即生效 tcgetattr(fdcom, &termios_old);
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return(tmp);
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}
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/*******************************************
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* Open serial port
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* tty: 端口号 ttyS0, ttyS1, ....
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* 返回值为串口文件描述符
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********************************************/
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int uart_init(const char* dev)
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{
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return(open(dev, O_RDWR | O_NOCTTY | O_NONBLOCK));
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}
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/*******************************************
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* Close serial port
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********************************************/
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void uart_deinit(int fdcom)
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{
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close(fdcom);
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}
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/********************************************
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* send data
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* fdcom: 串口描述符，data: 待发送数据，datalen: 数据长度
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* 返回实际发送长度
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*********************************************/
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int uart_txd(int fdcom, const unsigned char *data, int datalen)
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{
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int len = 0;
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len = write(fdcom, data, datalen);
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if(len == datalen){
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return (len);
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}
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else{
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tcflush(fdcom, TCOFLUSH);
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return -1;
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}
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}
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/*******************************************
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* receive data
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* 返回实际读入的字节数
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*
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********************************************/
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int uart_rxd(int fdcom, unsigned char *data, int datalen, int baudrate)
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{
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int readlen, fs_sel;
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fd_set fs_read;
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struct timeval tv_timeout;
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FD_ZERO(&fs_read);
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FD_SET(fdcom, &fs_read);
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tv_timeout.tv_sec = TIMEOUT_SEC(datalen, baudrate);
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tv_timeout.tv_usec = TIMEOUT_USEC;
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fs_sel = select(fdcom+1, &fs_read, NULL, NULL, &tv_timeout);
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if(fs_sel){
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// tcflush(fdcom, TCIFLUSH);
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// ms
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usleep(300000);
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readlen = read(fdcom, data, datalen);
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// unsigned char bit = data[0];
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return readlen;
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}
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else{
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return (-1);
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}
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// return -1
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return (readlen);
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}
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#ifdef TEST
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int fdcom = 0;
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/**
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* @brief
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* @param
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* @retval
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*/
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int main(int argc, char**argv)
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{
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fdcom = uart_init("/dev/COM0");
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if(fdcom > 0)
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{
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PortInfo_t portinfo = {115200, 8, 2, 0, 1, 0};
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uart_set(fdcom, &portinfo);
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printf("[PARAM]: 115200, 8, 2, 0, 1, 0\n");
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}
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else
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{
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printf("[ERROR]: open serial port error.\n");
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}
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uart_deinit(fdcom);
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return 0;
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}
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#endif
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