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/*
HardwareSerial.cpp - esp8266 UART support
Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Modified 31 March 2015 by Markus Sattler (rewrite the code for UART0 + UART1 support in ESP8266)
Modified 25 April 2015 by Thomas Flayols (add configuration different from 8N1 in ESP8266)
Modified 3 May 2015 by Hristo Gochkov (change register access methods)
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "Arduino.h"
#include "HardwareSerial.h"
#include "Esp.h"
HardwareSerial::HardwareSerial(int uart_nr)
: _uart_nr(uart_nr), _rx_size(256)
{}
void HardwareSerial::begin(unsigned long baud, SerialConfig config, SerialMode mode, uint8_t tx_pin)
{
end();
_uart = uart_init(_uart_nr, baud, (int) config, (int) mode, tx_pin, _rx_size);
#if defined(DEBUG_ESP_PORT) && !defined(NDEBUG)
if (static_cast<void*>(this) == static_cast<void*>(&DEBUG_ESP_PORT))
{
setDebugOutput(true);
println();
println(ESP.getFullVersion());
}
#endif
}
void HardwareSerial::end()
{
if(uart_get_debug() == _uart_nr) {
uart_set_debug(UART_NO);
}
uart_uninit(_uart);
_uart = NULL;
}
size_t HardwareSerial::setRxBufferSize(size_t size){
if(_uart) {
_rx_size = uart_resize_rx_buffer(_uart, size);
} else {
_rx_size = size;
}
return _rx_size;
}
void HardwareSerial::setDebugOutput(bool en)
{
if(!_uart) {
return;
}
if(en) {
if(uart_tx_enabled(_uart)) {
uart_set_debug(_uart_nr);
} else {
uart_set_debug(UART_NO);
}
} else {
// disable debug for this interface
if(uart_get_debug() == _uart_nr) {
uart_set_debug(UART_NO);
}
}
}
int HardwareSerial::available(void)
{
int result = static_cast<int>(uart_rx_available(_uart));
if (!result) {
optimistic_yield(10000);
}
return result;
}
void HardwareSerial::flush()
{
if(!_uart || !uart_tx_enabled(_uart)) {
return;
}
uart_wait_tx_empty(_uart);
//Workaround for a bug in serial not actually being finished yet
//Wait for 8 data bits, 1 parity and 2 stop bits, just in case
delayMicroseconds(11000000 / uart_get_baudrate(_uart) + 1);
}
void HardwareSerial::startDetectBaudrate()
{
uart_start_detect_baudrate(_uart_nr);
}
unsigned long HardwareSerial::testBaudrate()
{
return uart_detect_baudrate(_uart_nr);
}
unsigned long HardwareSerial::detectBaudrate(time_t timeoutMillis)
{
time_t startMillis = millis();
unsigned long detectedBaudrate;
while ((time_t) millis() - startMillis < timeoutMillis) {
if ((detectedBaudrate = testBaudrate())) {
break;
}
yield();
delay(100);
}
return detectedBaudrate;
}
#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
HardwareSerial Serial(UART0);
#endif
#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL1)
HardwareSerial Serial1(UART1);
#endif