/*
 * uart.cpp
 *
 *  Created on: Oct 16, 2014
 *      Author: Alan Aguilar Sologuren
 */

#include "uart.h"

namespace rbp {

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

/*!
 *
 */
uart::uart(uint32_t baudrate,int buffsz){
	fs=-1;
	buffsize = buffsz;
	rx_buffer = nullptr;
	tx_buffer = nullptr;
	if(!setup(baudrate)){
		delete this; //TODO log
	}
}

/*!
 *
 */
uart::~uart() {
	if(fs!=-1){
		close(fs);
	}
}


/*!
 *
 */
bool uart::setup(uint32_t baudrate){
	fs = -1;
	//Open in non blocking read/write mode
	fs = open("/dev/ttyAMA0", O_RDWR | O_NOCTTY | O_NDELAY);
	if (fs == -1)
	{
		printf("Error - Unable to open UART.  Ensure it is not in use by another application\n");// TODO cambiar al sistema de log
		return false;
	}
	struct termios options;
	tcgetattr(fs, &options);
	options.c_cflag = baudrate | CS8 | CLOCAL | CREAD;
	options.c_iflag = IGNPAR;
	options.c_oflag = 0;
	options.c_lflag = 0;
	tcflush(fs, TCIFLUSH);
	tcsetattr(fs, TCSANOW, &options);
	return true;
}

/*!
 *
 */
ssize_t uart::receive(uint8_t* rx_buff){
	ssize_t cnt=0;
	if (fs != -1)
	{
		rx_buffer = new uint8_t[256];
		cnt = read(fs, (void*)rx_buffer, 255);
		if (cnt < 0)
		{
			//An error occured (will occur if there are no bytes)
			//TODO cambiar a sistema de log
		}
		else if (cnt == 0)
		{
			//No data waiting
			//TODO cambiar a sistema de log
		}
		else
		{
			rx_buffer[cnt] = '\0';
			rx_buff = rx_buffer;
		}
	}
	return cnt;
}

/*!
 *
 */
ssize_t uart::transmit(uint8_t* tx_buff, size_t nbytes){
	ssize_t cnt=0;
	if (fs != -1)
	{
		tx_buffer = tx_buff;
		cnt = write(fs, (void*)tx_buffer, nbytes);		//Filestream, bytes to write, number of bytes to write
		if (cnt < 0)
		{
			printf("UART TX error\n");//TODO cambiar a sistema de log
		}
	}
	return cnt;
}

} /* namespace rbp */