/*********************************************************************************
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* Copyright: (C) 2018 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: comport.h
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* Description: This head file is for the common TTY/Serial port operator library
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*
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* Version: 1.0.0(10/17/2018~)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "10/17/2018 03:33:25 PM"
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*
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********************************************************************************/
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#ifndef __COMPORT_H_
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#define __COMPORT_H_
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <termios.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/select.h>
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#define BUF_64 64
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#ifndef DEVNAME_LEN
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#define DEVNAME_LEN 64
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#endif
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//#define COM_DEBUG
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#ifdef COM_DEBUG
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#define COM_PRINT(format,args...) printf(format, ##args)
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#else
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#define COM_PRINT(format,args...) do{} while(0);
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#endif
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//#define msleep(m) {struct timespec cSleep; cSleep.tv_sec = 0; cSleep.tv_nsec = m * 1000; nanosleep(&cSleep, 0);}
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typedef struct _st_comport
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{
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char dev_name[DEVNAME_LEN];
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unsigned char databit, parity, stopbit, flowctrl;
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long baudrate;
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int fd;
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int frag_size;
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} st_comport;
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/*
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* description: initialise the comport structure
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*
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* input args: $dev_name: The comport device name path, such as '/dev/ttyS3'
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* $baudrate: The baudrate, such as 115200
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* $settings: The databit,parity,stopbit,flowctrl settings, such as '8N1N'
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*
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* return value: The st_comport structure pointer, NULL means failure.
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*/
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st_comport *comport_init(const char *dev_name, int baudrate, const char *settings);
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/*
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* description: Open the comport specified by $comport
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* input args: $comport: corresponding comport point
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* return value: The comport opened file description, <0 means failure
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*/
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extern int comport_open(st_comport * comport);
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/*
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* description: read data from $comport in $timeout <ms> to $buf no more than $buf_size bytes
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* return value: the actual read data bytes, <0: read failure
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*/
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extern int comport_recv(st_comport * comport, char *buf, int buf_size, unsigned long timeout);
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/*
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* description: write $send_bytes bytes data from $buf to $comport
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* return value: 0: write ok <0: write failure
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*/
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extern int comport_send(st_comport * comport, char *buf, int send_bytes);
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/*
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* description: display current comport settings such as databit,parity,stopbit,flowctrl
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* input args: $comport: corresponding comport point
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*/
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//extern void disp_settings(st_comport * comport);
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/*
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* description: close comport
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* input args: $comport: corresponding comport point
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*/
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extern void comport_close(st_comport * comport);
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/*
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* description: terminat comport, close and free it
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* input args: $comport: corresponding comport point
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*/
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extern void comport_term(st_comport * comport);
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#endif
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