//**************************************************************************************
/*! \copyright:     2020-2021 Thales Alenia Space Deutschland GmbH
* \project:         multiMIND
* \file:            (name of source file: uart.h)
* \date:            (20.05.2021)
* \author:          (Sarthak Kelapure)
* \brief:           (UART thread to collect data on serial interface)
* \language:        (C)
**************************************************************************************
*/
#ifndef LIB_UART_H
#define LIB_UART_H

#define BUFF_SIZE 512
#define POLL_TIMEOUT 2000

#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <termios.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

#include <unistd.h>
#include <pthread.h>
#include <signal.h>
#include <poll.h>
#include <errno.h>

#ifdef __cplusplus
extern "C" {
#endif


typedef struct serial_s serial_t;

/**
 * Destroy the serial structure
 */
void uart_destroy(serial_t* s);

/**
 * Initializes the serial connection
 * @param device - serial device name.
 * @param baud - baud rate for connection.
 * @return serial structure.
 */
serial_t* uart_init(char device[], int baud);

/**
 * Send data.
 * @param s - serial structure.
 * @param data - character array to transmit.
 * @param length - size of the data array.
 */
uint32_t uart_length_send(serial_t* s, uint8_t data[], int length);

/**
 * Send a single character.
 * @param s - serial structure.
 * @param data - single character to be sent.
 */
void uart_send(serial_t* s, uint8_t data);

/**
 * Determine how much data is available
 * in the serial buffer.
 * @param s - serial structure.
 * @return number of characters available.
 */
int uart_available(serial_t* s);

/**
 * Fetch one char from the serial buffer.
 * @param s - serial structure.
 * @return character. Null if empty.
 */
char uart_get(serial_t* s);

/**
 * Fetch length of chars from the serial buffer.
 * @param s - serial structure.
 * @param buff - readback storage
 * @param len - length to get
 * @return length. zero if empty.
 */
int uart_length_get(serial_t* s, char* buff, int len, bool start_of_packet);

uint16_t uart_get_hdlc_packet(serial_t* s, uint8_t *buff, uint16_t buff_len);

/**
 * Fetch one char from the serial buffer.
 * Blocks until data becomes available.
 * @param s - serial structure.
 * @return character.
 */
char uart_blocking_get(serial_t* s);

/**
 * Clear the serial buffer.
 * @param s - serial structure.
 */
void uart_clear(serial_t* s);

/**
 * Close the serial port.
 * @param s - serial structure.
 * @return value of close().
 */
int uart_close(serial_t* s);

/**
 * Deinitializes the UART
 * @param s - serial structure.
 */
void uart_deinit(serial_t* s);

#ifdef __cplusplus
}
#endif

#endif	//LIB_UART_H