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e4d9c279ef
* Function added to detect baudrate * Added uart_start_detect_baudrate, detectBaudrate() wrappers for HardwareSerial and an example usage SerialDetectBaudrate.ino * Some layout changes to pass Travis tests * Some more nitty-gritty layout changes to pass Travis tests * Some even more nitty-gritty layout changes to pass Travis tests * renamed one function to testBaudrate() and updated doc/reference.rst * Minor updates to doc/reference.rst * New lines added
141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
/*
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HardwareSerial.cpp - esp8266 UART support
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Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 31 March 2015 by Markus Sattler (rewrite the code for UART0 + UART1 support in ESP8266)
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Modified 25 April 2015 by Thomas Flayols (add configuration different from 8N1 in ESP8266)
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Modified 3 May 2015 by Hristo Gochkov (change register access methods)
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "Arduino.h"
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#include "HardwareSerial.h"
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#include "Esp.h"
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HardwareSerial::HardwareSerial(int uart_nr)
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: _uart_nr(uart_nr), _rx_size(256)
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{}
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void HardwareSerial::begin(unsigned long baud, SerialConfig config, SerialMode mode, uint8_t tx_pin)
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{
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end();
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_uart = uart_init(_uart_nr, baud, (int) config, (int) mode, tx_pin, _rx_size);
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#if defined(DEBUG_ESP_PORT) && !defined(NDEBUG)
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if (static_cast<void*>(this) == static_cast<void*>(&DEBUG_ESP_PORT))
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{
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setDebugOutput(true);
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println();
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println(ESP.getFullVersion());
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}
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#endif
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}
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void HardwareSerial::end()
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{
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if(uart_get_debug() == _uart_nr) {
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uart_set_debug(UART_NO);
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}
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uart_uninit(_uart);
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_uart = NULL;
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}
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size_t HardwareSerial::setRxBufferSize(size_t size){
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if(_uart) {
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_rx_size = uart_resize_rx_buffer(_uart, size);
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} else {
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_rx_size = size;
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}
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return _rx_size;
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}
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void HardwareSerial::setDebugOutput(bool en)
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{
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if(!_uart) {
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return;
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}
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if(en) {
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if(uart_tx_enabled(_uart)) {
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uart_set_debug(_uart_nr);
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} else {
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uart_set_debug(UART_NO);
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}
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} else {
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// disable debug for this interface
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if(uart_get_debug() == _uart_nr) {
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uart_set_debug(UART_NO);
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}
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}
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}
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int HardwareSerial::available(void)
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{
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int result = static_cast<int>(uart_rx_available(_uart));
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if (!result) {
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optimistic_yield(10000);
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}
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return result;
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}
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void HardwareSerial::flush()
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{
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if(!_uart || !uart_tx_enabled(_uart)) {
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return;
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}
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uart_wait_tx_empty(_uart);
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//Workaround for a bug in serial not actually being finished yet
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//Wait for 8 data bits, 1 parity and 2 stop bits, just in case
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delayMicroseconds(11000000 / uart_get_baudrate(_uart) + 1);
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}
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void HardwareSerial::startDetectBaudrate()
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{
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uart_start_detect_baudrate(_uart_nr);
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}
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unsigned long HardwareSerial::testBaudrate()
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{
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return uart_detect_baudrate(_uart_nr);
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}
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unsigned long HardwareSerial::detectBaudrate(time_t timeoutMillis)
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{
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time_t startMillis = millis();
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unsigned long detectedBaudrate;
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while ((time_t) millis() - startMillis < timeoutMillis) {
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if ((detectedBaudrate = testBaudrate())) {
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break;
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}
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yield();
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delay(100);
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}
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return detectedBaudrate;
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}
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#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
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HardwareSerial Serial(UART0);
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#endif
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#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL1)
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HardwareSerial Serial1(UART1);
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#endif
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