680 lines
20 KiB
C++
680 lines
20 KiB
C++
/*
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SoftwareSerial.cpp - Implementation of the Arduino software serial for ESP8266/ESP32.
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Copyright (c) 2015-2016 Peter Lerup. All rights reserved.
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Copyright (c) 2018-2019 Dirk O. Kaar. All rights reserved.
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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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*/
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#include "SoftwareSerial.h"
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#include <Arduino.h>
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#ifndef ESP32
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uint32_t SoftwareSerial::m_savedPS = 0;
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#else
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portMUX_TYPE SoftwareSerial::m_interruptsMux = portMUX_INITIALIZER_UNLOCKED;
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#endif
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inline void IRAM_ATTR SoftwareSerial::disableInterrupts()
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{
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#ifndef ESP32
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m_savedPS = xt_rsil(15);
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#else
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taskENTER_CRITICAL(&m_interruptsMux);
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#endif
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}
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inline void IRAM_ATTR SoftwareSerial::restoreInterrupts()
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{
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#ifndef ESP32
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xt_wsr_ps(m_savedPS);
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#else
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taskEXIT_CRITICAL(&m_interruptsMux);
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#endif
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}
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constexpr uint8_t BYTE_ALL_BITS_SET = ~static_cast<uint8_t>(0);
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SoftwareSerial::SoftwareSerial() {
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m_isrOverflow = false;
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m_rxGPIOPullUpEnabled = true;
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m_txGPIOOpenDrain = false;
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}
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SoftwareSerial::SoftwareSerial(int8_t rxPin, int8_t txPin, bool invert)
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{
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m_isrOverflow = false;
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m_rxGPIOPullUpEnabled = true;
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m_txGPIOOpenDrain = false;
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m_rxPin = rxPin;
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m_txPin = txPin;
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m_invert = invert;
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}
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SoftwareSerial::~SoftwareSerial() {
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end();
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}
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#if __GNUC__ >= 10
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constexpr
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#endif
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bool SoftwareSerial::isValidGPIOpin(int8_t pin) const {
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#if defined(ESP8266)
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return (pin >= 0 && pin <= 16) && !isFlashInterfacePin(pin);
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#elif defined(ESP32)
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// Remove the strapping pins as defined in the datasheets, they affect bootup and other critical operations
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// Remmove the flash memory pins on related devices, since using these causes memory access issues.
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#ifdef CONFIG_IDF_TARGET_ESP32
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// Datasheet https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf,
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// Pinout https://docs.espressif.com/projects/esp-idf/en/latest/esp32/_images/esp32-devkitC-v4-pinout.jpg
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return (pin == 1) || (pin >= 3 && pin <= 5) ||
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(pin >= 12 && pin <= 15) ||
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(!psramFound() && pin >= 16 && pin <= 17) ||
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(pin >= 18 && pin <= 19) ||
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(pin >= 21 && pin <= 23) || (pin >= 25 && pin <= 27) || (pin >= 32 && pin <= 39);
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#elif CONFIG_IDF_TARGET_ESP32S2
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// Datasheet https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf,
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// Pinout https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/_images/esp32-s2_saola1-pinout.jpg
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return (pin >= 1 && pin <= 21) || (pin >= 33 && pin <= 44);
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#elif CONFIG_IDF_TARGET_ESP32C3
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// Datasheet https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf,
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// Pinout https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/_images/esp32-c3-devkitm-1-v1-pinout.jpg
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return (pin >= 0 && pin <= 1) || (pin >= 3 && pin <= 7) || (pin >= 18 && pin <= 21);
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#else
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return pin >= 0;
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#endif
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#else
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return pin >= 0;
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#endif
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}
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#if __GNUC__ >= 10
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constexpr
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#endif
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bool SoftwareSerial::isValidRxGPIOpin(int8_t pin) const {
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return isValidGPIOpin(pin)
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#if defined(ESP8266)
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&& (pin != 16)
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#endif
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;
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}
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#if __GNUC__ >= 10
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constexpr
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#endif
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bool SoftwareSerial::isValidTxGPIOpin(int8_t pin) const {
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return isValidGPIOpin(pin)
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#if defined(ESP32)
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#ifdef CONFIG_IDF_TARGET_ESP32
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&& (pin < 34)
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#elif CONFIG_IDF_TARGET_ESP32S2
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&& (pin <= 45)
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#elif CONFIG_IDF_TARGET_ESP32C3
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// no restrictions
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#endif
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#endif
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;
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}
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#if __GNUC__ >= 10
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constexpr
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#endif
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bool SoftwareSerial::hasRxGPIOPullUp(int8_t pin) const {
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#if defined(ESP32)
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return !(pin >= 34 && pin <= 39);
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#else
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(void)pin;
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return true;
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#endif
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}
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void SoftwareSerial::setRxGPIOPinMode() {
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if (m_rxValid) {
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pinMode(m_rxPin, hasRxGPIOPullUp(m_rxPin) && m_rxGPIOPullUpEnabled ? INPUT_PULLUP : INPUT);
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}
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}
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void SoftwareSerial::setTxGPIOPinMode() {
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if (m_txValid) {
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pinMode(m_txPin, m_txGPIOOpenDrain ? OUTPUT_OPEN_DRAIN : OUTPUT);
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}
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}
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void SoftwareSerial::begin(uint32_t baud, SoftwareSerialConfig config,
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int8_t rxPin, int8_t txPin,
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bool invert, int bufCapacity, int isrBufCapacity) {
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if (-1 != rxPin) m_rxPin = rxPin;
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if (-1 != txPin) m_txPin = txPin;
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m_oneWire = (m_rxPin == m_txPin);
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m_invert = invert;
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m_dataBits = 5 + (config & 07);
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m_parityMode = static_cast<SoftwareSerialParity>(config & 070);
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m_stopBits = 1 + ((config & 0300) ? 1 : 0);
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m_pduBits = m_dataBits + static_cast<bool>(m_parityMode) + m_stopBits;
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m_bitTicks = (microsToTicks(1000000UL) + baud / 2) / baud;
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m_intTxEnabled = true;
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if (isValidRxGPIOpin(m_rxPin)) {
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m_rxReg = portInputRegister(digitalPinToPort(m_rxPin));
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m_rxBitMask = digitalPinToBitMask(m_rxPin);
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m_buffer.reset(new circular_queue<uint8_t>((bufCapacity > 0) ? bufCapacity : 64));
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if (m_parityMode)
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{
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m_parityBuffer.reset(new circular_queue<uint8_t>((m_buffer->capacity() + 7) / 8));
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m_parityInPos = m_parityOutPos = 1;
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}
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m_isrBuffer.reset(new circular_queue<uint32_t, SoftwareSerial*>((isrBufCapacity > 0) ?
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isrBufCapacity : m_buffer->capacity() * (2 + m_dataBits + static_cast<bool>(m_parityMode))));
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if (m_buffer && (!m_parityMode || m_parityBuffer) && m_isrBuffer) {
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m_rxValid = true;
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setRxGPIOPinMode();
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}
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}
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if (isValidTxGPIOpin(m_txPin)) {
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#if !defined(ESP8266)
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m_txReg = portOutputRegister(digitalPinToPort(m_txPin));
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#endif
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m_txBitMask = digitalPinToBitMask(m_txPin);
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m_txValid = true;
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if (!m_oneWire) {
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setTxGPIOPinMode();
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digitalWrite(m_txPin, !m_invert);
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}
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}
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enableRx(true);
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}
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void SoftwareSerial::end()
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{
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enableRx(false);
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m_txValid = false;
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if (m_buffer) {
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m_buffer.reset();
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}
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m_parityBuffer.reset();
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if (m_isrBuffer) {
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m_isrBuffer.reset();
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}
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}
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uint32_t SoftwareSerial::baudRate() {
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return 1000000UL / ticksToMicros(m_bitTicks);
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}
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void SoftwareSerial::setTransmitEnablePin(int8_t txEnablePin) {
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if (isValidTxGPIOpin(txEnablePin)) {
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m_txEnableValid = true;
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m_txEnablePin = txEnablePin;
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pinMode(m_txEnablePin, OUTPUT);
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digitalWrite(m_txEnablePin, LOW);
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}
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else {
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m_txEnableValid = false;
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}
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}
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void SoftwareSerial::enableIntTx(bool on) {
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m_intTxEnabled = on;
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}
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void SoftwareSerial::enableRxGPIOPullUp(bool on) {
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m_rxGPIOPullUpEnabled = on;
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setRxGPIOPinMode();
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}
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void SoftwareSerial::enableTxGPIOOpenDrain(bool on) {
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m_txGPIOOpenDrain = on;
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setTxGPIOPinMode();
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}
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void SoftwareSerial::enableTx(bool on) {
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if (m_txValid && m_oneWire) {
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if (on) {
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enableRx(false);
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setTxGPIOPinMode();
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digitalWrite(m_txPin, !m_invert);
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}
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else {
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setRxGPIOPinMode();
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enableRx(true);
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}
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}
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}
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void SoftwareSerial::enableRx(bool on) {
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if (m_rxValid && on != m_rxEnabled) {
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if (on) {
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m_rxLastBit = m_pduBits - 1;
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// Init to stop bit level and current tick
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m_isrLastTick = (microsToTicks(micros()) | 1) ^ m_invert;
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if (m_bitTicks >= microsToTicks(1000000UL / 74880UL))
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attachInterruptArg(digitalPinToInterrupt(m_rxPin), reinterpret_cast<void (*)(void*)>(rxBitISR), this, CHANGE);
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else
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attachInterruptArg(digitalPinToInterrupt(m_rxPin), reinterpret_cast<void (*)(void*)>(rxBitSyncISR), this, m_invert ? RISING : FALLING);
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}
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else {
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detachInterrupt(digitalPinToInterrupt(m_rxPin));
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}
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m_rxEnabled = on;
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}
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}
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int SoftwareSerial::read() {
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if (!m_rxValid) { return -1; }
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if (!m_buffer->available()) {
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rxBits();
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if (!m_buffer->available()) { return -1; }
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}
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auto val = m_buffer->pop();
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if (m_parityBuffer)
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{
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m_lastReadParity = m_parityBuffer->peek() & m_parityOutPos;
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m_parityOutPos <<= 1;
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if (!m_parityOutPos)
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{
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m_parityOutPos = 1;
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m_parityBuffer->pop();
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}
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}
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return val;
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}
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int SoftwareSerial::read(uint8_t* buffer, size_t size) {
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if (!m_rxValid) { return 0; }
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int avail;
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if (0 == (avail = m_buffer->pop_n(buffer, size))) {
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rxBits();
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avail = m_buffer->pop_n(buffer, size);
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}
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if (!avail) return 0;
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if (m_parityBuffer) {
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uint32_t parityBits = avail;
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while (m_parityOutPos >>= 1) ++parityBits;
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m_parityOutPos = (1 << (parityBits % 8));
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m_parityBuffer->pop_n(nullptr, parityBits / 8);
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}
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return avail;
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}
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size_t SoftwareSerial::readBytes(uint8_t* buffer, size_t size) {
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if (!m_rxValid || !size) { return 0; }
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size_t count = 0;
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auto start = millis();
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do {
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auto readCnt = read(&buffer[count], size - count);
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count += readCnt;
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if (count >= size) break;
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if (readCnt) {
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start = millis();
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}
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else {
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optimistic_yield(1000UL);
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}
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} while (millis() - start < _timeout);
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return count;
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}
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int SoftwareSerial::available() {
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if (!m_rxValid) { return 0; }
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rxBits();
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int avail = m_buffer->available();
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if (!avail) {
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optimistic_yield(10000UL);
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}
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return avail;
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}
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void SoftwareSerial::lazyDelay() {
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// Reenable interrupts while delaying to avoid other tasks piling up
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if (!m_intTxEnabled) { restoreInterrupts(); }
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const auto expired = microsToTicks(micros()) - m_periodStart;
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const int32_t remaining = m_periodDuration - expired;
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const int32_t ms = remaining > 0 ? static_cast<int32_t>(ticksToMicros(remaining) / 1000L) : 0;
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if (ms > 0)
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{
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delay(ms);
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}
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else
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{
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optimistic_yield(10000UL);
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}
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// Assure that below-ms part of delays are not elided
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preciseDelay();
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// Disable interrupts again if applicable
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if (!m_intTxEnabled) { disableInterrupts(); }
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}
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void IRAM_ATTR SoftwareSerial::preciseDelay() {
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uint32_t ticks;
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uint32_t expired;
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do {
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ticks = microsToTicks(micros());
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expired = ticks - m_periodStart;
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} while (static_cast<int32_t>(m_periodDuration - expired) > 0);
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m_periodDuration = 0;
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m_periodStart = ticks;
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}
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void IRAM_ATTR SoftwareSerial::writePeriod(
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uint32_t dutyCycle, uint32_t offCycle, bool withStopBit) {
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preciseDelay();
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if (dutyCycle)
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{
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#if defined(ESP8266)
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if (16 == m_txPin) {
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GP16O = 1;
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}
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else {
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GPOS = m_txBitMask;
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}
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#else
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*m_txReg |= m_txBitMask;
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#endif
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m_periodDuration += dutyCycle;
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if (offCycle || (withStopBit && !m_invert)) {
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if (!withStopBit || m_invert) {
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preciseDelay();
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}
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else {
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lazyDelay();
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}
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}
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}
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if (offCycle)
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{
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#if defined(ESP8266)
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if (16 == m_txPin) {
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GP16O = 0;
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}
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else {
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GPOC = m_txBitMask;
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}
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#else
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*m_txReg &= ~m_txBitMask;
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#endif
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m_periodDuration += offCycle;
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if (withStopBit && m_invert) lazyDelay();
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}
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}
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size_t SoftwareSerial::write(uint8_t byte) {
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return write(&byte, 1);
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}
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size_t SoftwareSerial::write(uint8_t byte, SoftwareSerialParity parity) {
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return write(&byte, 1, parity);
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}
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size_t SoftwareSerial::write(const uint8_t* buffer, size_t size) {
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return write(buffer, size, m_parityMode);
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}
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size_t IRAM_ATTR SoftwareSerial::write(const uint8_t* buffer, size_t size, SoftwareSerialParity parity) {
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if (m_rxValid) { rxBits(); }
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if (!m_txValid) { return -1; }
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if (m_txEnableValid) {
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digitalWrite(m_txEnablePin, HIGH);
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}
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// Stop bit: if inverted, LOW, otherwise HIGH
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bool b = !m_invert;
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uint32_t dutyCycle = 0;
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uint32_t offCycle = 0;
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if (!m_intTxEnabled) {
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// Disable interrupts in order to get a clean transmit timing
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disableInterrupts();
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}
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const uint32_t dataMask = ((1UL << m_dataBits) - 1);
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bool withStopBit = true;
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m_periodDuration = 0;
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m_periodStart = microsToTicks(micros());
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for (size_t cnt = 0; cnt < size; ++cnt) {
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uint8_t byte = pgm_read_byte(buffer + cnt) & dataMask;
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// push LSB start-data-parity-stop bit pattern into uint32_t
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// Stop bits: HIGH
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uint32_t word = ~0UL;
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// inverted parity bit, performance tweak for xor all-bits-set word
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if (parity && m_parityMode)
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{
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uint32_t parityBit;
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switch (parity)
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{
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case SWSERIAL_PARITY_EVEN:
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// from inverted, so use odd parity
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parityBit = byte;
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parityBit ^= parityBit >> 4;
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parityBit &= 0xf;
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parityBit = (0x9669 >> parityBit) & 1;
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break;
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case SWSERIAL_PARITY_ODD:
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// from inverted, so use even parity
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parityBit = byte;
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parityBit ^= parityBit >> 4;
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parityBit &= 0xf;
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parityBit = (0x6996 >> parityBit) & 1;
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break;
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case SWSERIAL_PARITY_MARK:
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parityBit = 0;
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break;
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case SWSERIAL_PARITY_SPACE:
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// suppresses warning parityBit uninitialized
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default:
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parityBit = 1;
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break;
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}
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word ^= parityBit;
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}
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word <<= m_dataBits;
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word |= byte;
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// Start bit: LOW
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word <<= 1;
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if (m_invert) word = ~word;
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for (int i = 0; i <= m_pduBits; ++i) {
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bool pb = b;
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b = word & (1UL << i);
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if (!pb && b) {
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writePeriod(dutyCycle, offCycle, withStopBit);
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withStopBit = false;
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dutyCycle = offCycle = 0;
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}
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if (b) {
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dutyCycle += m_bitTicks;
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}
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else {
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offCycle += m_bitTicks;
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}
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}
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withStopBit = true;
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}
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writePeriod(dutyCycle, offCycle, true);
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if (!m_intTxEnabled) {
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// restore the interrupt state if applicable
|
|
restoreInterrupts();
|
|
}
|
|
if (m_txEnableValid) {
|
|
digitalWrite(m_txEnablePin, LOW);
|
|
}
|
|
return size;
|
|
}
|
|
|
|
void SoftwareSerial::flush() {
|
|
if (!m_rxValid) { return; }
|
|
m_buffer->flush();
|
|
if (m_parityBuffer)
|
|
{
|
|
m_parityInPos = m_parityOutPos = 1;
|
|
m_parityBuffer->flush();
|
|
}
|
|
}
|
|
|
|
bool SoftwareSerial::overflow() {
|
|
bool res = m_overflow;
|
|
m_overflow = false;
|
|
return res;
|
|
}
|
|
|
|
int SoftwareSerial::peek() {
|
|
if (!m_rxValid) { return -1; }
|
|
if (!m_buffer->available()) {
|
|
rxBits();
|
|
if (!m_buffer->available()) return -1;
|
|
}
|
|
auto val = m_buffer->peek();
|
|
if (m_parityBuffer) m_lastReadParity = m_parityBuffer->peek() & m_parityOutPos;
|
|
return val;
|
|
}
|
|
|
|
void SoftwareSerial::rxBits() {
|
|
#ifdef ESP8266
|
|
if (m_isrOverflow.load()) {
|
|
m_overflow = true;
|
|
m_isrOverflow.store(false);
|
|
}
|
|
#else
|
|
if (m_isrOverflow.exchange(false)) {
|
|
m_overflow = true;
|
|
}
|
|
#endif
|
|
|
|
m_isrBuffer->for_each(m_isrBufferForEachDel);
|
|
|
|
// A stop bit can go undetected if leading data bits are at same level
|
|
// and there was also no next start bit yet, so one word may be pending.
|
|
// Check that there was no new ISR data received in the meantime, inserting an
|
|
// extraneous stop level bit out of sequence breaks rx.
|
|
if (m_rxLastBit < m_pduBits - 1) {
|
|
const uint32_t detectionTicks = (m_pduBits - 1 - m_rxLastBit) * m_bitTicks;
|
|
if (!m_isrBuffer->available() && microsToTicks(micros()) - m_isrLastTick > detectionTicks) {
|
|
// Produce faux stop bit level, prevents start bit maldetection
|
|
// tick's LSB is repurposed for the level bit
|
|
rxBits(((m_isrLastTick + detectionTicks) | 1) ^ m_invert);
|
|
}
|
|
}
|
|
}
|
|
|
|
void SoftwareSerial::rxBits(const uint32_t isrTick) {
|
|
const bool level = (m_isrLastTick & 1) ^ m_invert;
|
|
|
|
// error introduced by edge value in LSB of isrTick is negligible
|
|
uint32_t ticks = isrTick - m_isrLastTick;
|
|
m_isrLastTick = isrTick;
|
|
|
|
uint32_t bits = ticks / m_bitTicks;
|
|
if (ticks % m_bitTicks > (m_bitTicks >> 1)) ++bits;
|
|
while (bits > 0) {
|
|
// start bit detection
|
|
if (m_rxLastBit >= (m_pduBits - 1)) {
|
|
// leading edge of start bit?
|
|
if (level) break;
|
|
m_rxLastBit = -1;
|
|
--bits;
|
|
continue;
|
|
}
|
|
// data bits
|
|
if (m_rxLastBit < (m_dataBits - 1)) {
|
|
uint8_t dataBits = min(bits, static_cast<uint32_t>(m_dataBits - 1 - m_rxLastBit));
|
|
m_rxLastBit += dataBits;
|
|
bits -= dataBits;
|
|
m_rxCurByte >>= dataBits;
|
|
if (level) { m_rxCurByte |= (BYTE_ALL_BITS_SET << (8 - dataBits)); }
|
|
continue;
|
|
}
|
|
// parity bit
|
|
if (m_parityMode && m_rxLastBit == (m_dataBits - 1)) {
|
|
++m_rxLastBit;
|
|
--bits;
|
|
m_rxCurParity = level;
|
|
continue;
|
|
}
|
|
// stop bits
|
|
// Store the received value in the buffer unless we have an overflow
|
|
// if not high stop bit level, discard word
|
|
if (bits >= static_cast<uint32_t>(m_pduBits - 1 - m_rxLastBit) && level) {
|
|
m_rxCurByte >>= (sizeof(uint8_t) * 8 - m_dataBits);
|
|
if (!m_buffer->push(m_rxCurByte)) {
|
|
m_overflow = true;
|
|
}
|
|
else {
|
|
if (m_parityBuffer)
|
|
{
|
|
if (m_rxCurParity) {
|
|
m_parityBuffer->pushpeek() |= m_parityInPos;
|
|
}
|
|
else {
|
|
m_parityBuffer->pushpeek() &= ~m_parityInPos;
|
|
}
|
|
m_parityInPos <<= 1;
|
|
if (!m_parityInPos)
|
|
{
|
|
m_parityBuffer->push();
|
|
m_parityInPos = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
m_rxLastBit = m_pduBits - 1;
|
|
// reset to 0 is important for masked bit logic
|
|
m_rxCurByte = 0;
|
|
m_rxCurParity = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void IRAM_ATTR SoftwareSerial::rxBitISR(SoftwareSerial* self) {
|
|
uint32_t curTick = microsToTicks(micros());
|
|
bool level = *self->m_rxReg & self->m_rxBitMask;
|
|
|
|
// Store level and tick in the buffer unless we have an overflow
|
|
// tick's LSB is repurposed for the level bit
|
|
if (!self->m_isrBuffer->push((curTick | 1U) ^ !level)) self->m_isrOverflow.store(true);
|
|
}
|
|
|
|
void IRAM_ATTR SoftwareSerial::rxBitSyncISR(SoftwareSerial* self) {
|
|
uint32_t start = microsToTicks(micros());
|
|
uint32_t wait = self->m_bitTicks - microsToTicks(2U);
|
|
|
|
bool level = self->m_invert;
|
|
// Store level and tick in the buffer unless we have an overflow
|
|
// tick's LSB is repurposed for the level bit
|
|
if (!self->m_isrBuffer->push(((start + wait) | 1U) ^ !level)) self->m_isrOverflow.store(true);
|
|
|
|
for (uint32_t i = 0; i < self->m_pduBits; ++i) {
|
|
while (microsToTicks(micros()) - start < wait) {};
|
|
wait += self->m_bitTicks;
|
|
|
|
// Store level and tick in the buffer unless we have an overflow
|
|
// tick's LSB is repurposed for the level bit
|
|
if (static_cast<bool>(*self->m_rxReg & self->m_rxBitMask) != level)
|
|
{
|
|
if (!self->m_isrBuffer->push(((start + wait) | 1U) ^ level)) self->m_isrOverflow.store(true);
|
|
level = !level;
|
|
}
|
|
}
|
|
}
|
|
|
|
void SoftwareSerial::onReceive(Delegate<void(int available), void*> handler) {
|
|
receiveHandler = handler;
|
|
}
|
|
|
|
void SoftwareSerial::perform_work() {
|
|
if (!m_rxValid) { return; }
|
|
rxBits();
|
|
if (receiveHandler) {
|
|
int avail = m_buffer->available();
|
|
if (avail) { receiveHandler(avail); }
|
|
}
|
|
}
|