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/*
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* uart.cpp
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*
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* Created on: Oct 16, 2014
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* Author: Alan Aguilar Sologuren
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*/
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#include "uart.h"
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namespace rbp {
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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/*!
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*
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*/
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uart::uart(uint32_t baudrate,int buffsz){
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fs=-1;
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buffsize = buffsz;
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rx_buffer = nullptr;
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tx_buffer = nullptr;
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if(!setup(baudrate)){
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delete this; //TODO log
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}
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}
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/*!
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*
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*/
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uart::~uart() {
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if(fs!=-1){
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close(fs);
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}
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}
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/*!
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*
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*/
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bool uart::setup(uint32_t baudrate){
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fs = -1;
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//Open in non blocking read/write mode
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fs = open("/dev/ttyAMA0", O_RDWR | O_NOCTTY | O_NDELAY);
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if (fs == -1)
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{
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printf("Error - Unable to open UART. Ensure it is not in use by another application\n");// TODO cambiar al sistema de log
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return false;
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}
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struct termios options;
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tcgetattr(fs, &options);
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options.c_cflag = baudrate | CS8 | CLOCAL | CREAD;
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options.c_iflag = IGNPAR;
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options.c_oflag = 0;
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options.c_lflag = 0;
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tcflush(fs, TCIFLUSH);
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tcsetattr(fs, TCSANOW, &options);
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return true;
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}
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/*!
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*
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*/
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ssize_t uart::receive(uint8_t* rx_buff){
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ssize_t cnt=0;
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if (fs != -1)
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{
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rx_buffer = new uint8_t[256];
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cnt = read(fs, (void*)rx_buffer, 255);
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if (cnt < 0)
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{
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//An error occured (will occur if there are no bytes)
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//TODO cambiar a sistema de log
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}
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else if (cnt == 0)
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{
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//No data waiting
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//TODO cambiar a sistema de log
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}
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else
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{
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rx_buffer[cnt] = '\0';
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rx_buff = rx_buffer;
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}
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}
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return cnt;
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}
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/*!
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*
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*/
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ssize_t uart::transmit(uint8_t* tx_buff, size_t nbytes){
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ssize_t cnt=0;
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if (fs != -1)
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{
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tx_buffer = tx_buff;
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cnt = write(fs, (void*)tx_buffer, nbytes); //Filestream, bytes to write, number of bytes to write
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if (cnt < 0)
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{
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printf("UART TX error\n");//TODO cambiar a sistema de log
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}
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}
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return cnt;
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}
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} /* namespace rbp */
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