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70203c3733
The DFPlayer device does not like successive commands arriving to quickly after one another and may ignore a command. The driver has been modified to enforce a delay between commands by sending pad characters where necessary.
292 lines
9.9 KiB
C++
292 lines
9.9 KiB
C++
/*
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* © 2022, Neil McKechnie. All rights reserved.
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*
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* This file is part of DCC++EX API
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* DFPlayer is an MP3 player module with an SD card holder. It also has an integrated
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* amplifier, so it only needs a power supply and a speaker.
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*
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* This driver allows the device to be controlled through IODevice::write() and
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* IODevice::writeAnalogue() calls.
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*
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* The driver is configured as follows:
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*
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* DFPlayer::create(firstVpin, nPins, Serialn);
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*
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* Where firstVpin is the first vpin reserved for reading the device,
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* nPins is the number of pins to be allocated (max 5)
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* and Serialn is the name of the Serial port connected to the DFPlayer (e.g. Serial1).
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*
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* Example:
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* In mySetup function within mySetup.cpp:
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* DFPlayer::create(3500, 5, Serial1);
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*
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* Writing an analogue value 1-2999 to the first pin (3500) will play the numbered file from the SD card;
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* Writing an analogue value 0 to the first pin (3500) will stop the file playing;
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* Writing an analogue value 0-30 to the second pin (3501) will set the volume;
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* Writing a digital value of 1 to a pin will play the file corresponding to that pin, e.g.
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the first file will be played by setting pin 3500, the second by setting pin 3501 etc.;
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* Writing a digital value of 0 to any pin will stop the player;
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* Reading a digital value from any pin will return true(1) if the player is playing, false(0) otherwise.
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*
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* From EX-RAIL, the following commands may be used:
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* SET(3500) -- starts playing the first file (file 1) on the SD card
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* SET(3501) -- starts playing the second file (file 2) on the SD card
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* etc.
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* RESET(3500) -- stops all playing on the player
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* WAITFOR(3500) -- wait for the file currently being played by the player to complete
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* SERVO(3500,2,Instant) -- plays file 2 at current volume
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* SERVO(3501,20,Instant) -- Sets the volume to 20
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*
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* NB The DFPlayer's serial lines are not 5V safe, so connecting the Arduino TX directly
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* to the DFPlayer's RX terminal will cause lots of noise over the speaker, or worse.
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* A 1k resistor in series with the module's RX terminal will alleviate this.
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*
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* Files on the SD card are numbered according to their order in the directory on the
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* card (as listed by the DIR command in Windows). This may not match the order of the files
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* as displayed by Windows File Manager, which sorts the file names. It is suggested that
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* files be copied into an empty SDcard in the desired order, one at a time.
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*/
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#ifndef IO_DFPlayer_h
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#define IO_DFPlayer_h
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#include "IODevice.h"
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class DFPlayer : public IODevice {
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private:
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HardwareSerial *_serial;
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bool _playing = false;
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uint8_t _inputIndex = 0;
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unsigned long _commandSendTime; // Allows timeout processing
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// When two commands are sent in quick succession, the device sometimes
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// fails to execute one. A delay is required between successive commands.
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// This could be implemented by buffering commands and outputting them
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// from the loop() function, but it would somewhat complicate the
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// driver. A simpler solution is to output a number of NUL pad characters
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// between successive command strings if there isn't sufficient elapsed time
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// between them. At 9600 baud, each pad character takes approximately
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// 1ms to complete. Experiments indicate that the minimum number of pads
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// for reliable operation is 17. This gives 17.7ms between the end of one
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// command and the beginning of the next, or 28ms between successive commands
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// being completed. I've allowed 20 characters, which is almost 21ms.
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const int numPadCharacters = 20; // Number of pad characters between commands
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public:
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static void create(VPIN firstVpin, int nPins, HardwareSerial &serial) {
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if (checkNoOverlap(firstVpin,nPins)) new DFPlayer(firstVpin, nPins, serial);
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}
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protected:
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// Constructor
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DFPlayer(VPIN firstVpin, int nPins, HardwareSerial &serial) :
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IODevice(firstVpin, nPins),
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_serial(&serial)
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{
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addDevice(this);
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}
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void _begin() override {
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_serial->begin(9600, SERIAL_8N1); // 9600baud, no parity, 1 stop bit
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// Flush any data in input queue
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while (_serial->available()) _serial->read();
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_deviceState = DEVSTATE_INITIALISING;
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// Send a query to the device to see if it responds
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sendPacket(0x42);
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_commandSendTime = micros();
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}
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void _loop(unsigned long currentMicros) override {
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// Check for incoming data on _serial, and update busy flag accordingly.
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// Expected message is in the form "7E FF 06 3D xx xx xx xx xx EF"
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while (_serial->available()) {
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int c = _serial->read();
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if (c == 0x7E && _inputIndex == 0)
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_inputIndex = 1;
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else if ((c==0xFF && _inputIndex==1)
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|| (c==0x3D && _inputIndex==3)
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|| (_inputIndex >=4 && _inputIndex <= 8))
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_inputIndex++;
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else if (c==0x06 && _inputIndex==2) {
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// Valid message prefix, so consider the device online
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if (_deviceState==DEVSTATE_INITIALISING) {
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_deviceState = DEVSTATE_NORMAL;
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#ifdef DIAG_IO
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_display();
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#endif
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}
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_inputIndex++;
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} else if (c==0xEF && _inputIndex==9) {
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// End of play
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if (_playing) {
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Finished"));
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#endif
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_playing = false;
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}
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_inputIndex = 0;
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} else
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_inputIndex = 0; // Unrecognised character sequence, start again!
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}
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// Check if the initial prompt to device has timed out. Allow 5 seconds
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if (_deviceState == DEVSTATE_INITIALISING && currentMicros - _commandSendTime > 5000000UL) {
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DIAG(F("DFPlayer device not responding on serial port"));
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_deviceState = DEVSTATE_FAILED;
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}
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delayUntil(currentMicros + 10000); // Only enter every 10ms
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}
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// Write with value 1 starts playing a song. The relative pin number is the file number.
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// Write with value 0 stops playing.
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void _write(VPIN vpin, int value) override {
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int pin = vpin - _firstVpin;
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if (value) {
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// Value 1, start playing
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Play %d"), pin+1);
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#endif
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sendPacket(0x03, pin+1);
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_playing = true;
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} else {
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// Value 0, stop playing
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Stop"));
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#endif
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sendPacket(0x16);
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_playing = false;
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}
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}
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// WriteAnalogue on first pin uses the nominated value as a file number to start playing, if file number > 0.
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// Volume may be specified as second parameter to writeAnalogue.
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// If value is zero, the player stops playing.
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// WriteAnalogue on second pin sets the output volume.
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void _writeAnalogue(VPIN vpin, int value, uint8_t volume=0, uint16_t=0) override {
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uint8_t pin = vpin - _firstVpin;
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// Validate parameter.
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volume = min((uint8_t)30,volume);
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if (pin == 0) {
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// Play track
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if (value > 0) {
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Play %d"), value);
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#endif
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sendPacket(0x03, value); // Play track
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_playing = true;
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if (volume > 0) {
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Volume %d"), volume);
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#endif
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sendPacket(0x06, volume); // Set volume
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}
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} else {
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Stop"));
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#endif
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sendPacket(0x16); // Stop play
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_playing = false;
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}
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} else if (pin == 1) {
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// Set volume (0-30)
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if (value > 30) value = 30;
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else if (value < 0) value = 0;
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#ifdef DIAG_IO
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DIAG(F("DFPlayer: Volume %d"), value);
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#endif
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sendPacket(0x06, value);
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}
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}
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// A read on any pin indicates whether the player is still playing.
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int _read(VPIN) override {
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return _playing;
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}
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void _display() override {
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DIAG(F("DFPlayer Configured on Vpins:%d-%d %S"), _firstVpin, _firstVpin+_nPins-1,
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(_deviceState==DEVSTATE_FAILED) ? F("OFFLINE") : F(""));
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}
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private:
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// 7E FF 06 0F 00 01 01 xx xx EF
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// 0 -> 7E is start code
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// 1 -> FF is version
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// 2 -> 06 is length
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// 3 -> 0F is command
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// 4 -> 00 is no receive
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// 5~6 -> 01 01 is argument
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// 7~8 -> checksum = 0 - ( FF+06+0F+00+01+01 )
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// 9 -> EF is end code
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void sendPacket(uint8_t command, uint16_t arg = 0)
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{
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unsigned long currentMillis = millis();
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uint8_t out[] = { 0x7E,
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0xFF,
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06,
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command,
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00,
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static_cast<uint8_t>(arg >> 8),
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static_cast<uint8_t>(arg & 0x00ff),
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00,
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00,
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0xEF };
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setChecksum(out);
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// Check how long since the last command was sent.
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// Each character takes approx 1ms at 9600 baud
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unsigned long minimumGap = numPadCharacters + sizeof(out);
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if (currentMillis - _commandSendTime < minimumGap) {
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// Output some pad characters to add an
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// artificial delay between commands
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for (int i=0; i<numPadCharacters; i++)
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_serial->write(0);
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}
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// Now output the command
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_serial->write(out, sizeof(out));
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_commandSendTime = currentMillis;
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}
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uint16_t calcChecksum(uint8_t* packet)
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{
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uint16_t sum = 0;
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for (int i = 1; i < 7; i++)
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{
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sum += packet[i];
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}
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return -sum;
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}
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void setChecksum(uint8_t* out)
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{
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uint16_t sum = calcChecksum(out);
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out[7] = (sum >> 8);
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out[8] = (sum & 0xff);
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}
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};
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#endif // IO_DFPlayer_h
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