/*
* © 2023, Neil McKechnie. All rights reserved.
*
* This file is part of DCC++EX API
*
* This is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* It 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CommandStation. If not, see .
*/
/*
* DFPlayer is an MP3 player module with an SD card holder. It also has an integrated
* amplifier, so it only needs a power supply and a speaker.
* This driver is a modified version of the IO_DFPlayer.h file
* *********************************************************************************************
*
* 2023, Added NXP SC16IS752 I2C Dual UART to enable the DFPlayer connection over the I2C bus
* The SC16IS752 has 64 bytes TX & RX FIFO buffer
* First version without interrupts from I2C UART and only RX/TX are used, interrupts may not be
* needed as the RX Fifo holds the reply
*
* myHall.cpp configuration syntax:
*
* I2CDFPlayer::create(1st vPin, vPins, I2C address, UART ch, AM);
*
* Parameters:
* 1st vPin : First virtual pin that EX-Rail can control to play a sound, use PLAYSOUND command (alias of ANOUT)
* vPins : Total number of virtual pins allocated (only 1 vPin is supported)
* I2C Address : I2C address of the serial controller, in 0x format,
* UART ch : Indicating UART 0 or UART 1, values 0 or 1
* AM : audio mixer, values: 1 or 2 to select an audio amplifier, no effect if AM is not installed
*
* The vPin is also an pin that can be read, it indicated if the DFPlayer has finished playing a track
*
*/
#ifndef IO_I2CDFPlayer_h
#define IO_I2CDFPlayer_h
#include "IODevice.h"
#include "I2CManager.h"
#include "DIAG.h"
// Debug and diagnostic defines, enable too many will result in slowing the driver
//#define DIAG_I2CDFplayer
//#define DIAG_I2CDFplayer_data
//#define DIAG_I2CDFplayer_reg
//#define DIAG_I2CDFplayer_playing
class I2CDFPlayer : public IODevice {
private:
const uint8_t MAXVOLUME=30;
uint8_t RETRYCOUNT = 0x03;
bool _playing = false;
uint8_t _inputIndex = 0;
unsigned long _commandSendTime; // Time (us) that last transmit took place.
unsigned long _timeoutTime;
uint8_t _recvCMD; // Last received command code byte
bool _awaitingResponse = false;
uint8_t _retryCounter = RETRYCOUNT; // Max retries before timing out
uint8_t _requestedVolumeLevel = MAXVOLUME;
uint8_t _currentVolume = MAXVOLUME;
int _requestedSong = -1; // -1=none, 0=stop, >0=file number
bool _repeat = false; // audio file is repeat playing
uint8_t _previousCmd = true;
// SC16IS752 defines
I2CAddress _I2CAddress;
I2CRB _rb;
uint8_t _UART_CH;
// Communication parameters for the DFPlayer are fixed at 8 bit, No parity, 1 stopbit
uint8_t WORD_LEN = 0x03; // Value LCR bit 0,1
uint8_t STOP_BIT = 0x00; // Value LCR bit 2
uint8_t PARITY_ENA = 0x00; // Value LCR bit 3
uint8_t PARITY_TYPE = 0x00; // Value LCR bit 4
uint32_t BAUD_RATE = 9600;
uint8_t PRESCALER = 0x01; // Value MCR bit 7
uint8_t TEMP_REG_VAL = 0x00;
uint8_t FIFO_RX_LEVEL = 0x00;
uint8_t RX_BUFFER = 0x00; // nr of bytes copied into _inbuffer
uint8_t FIFO_TX_LEVEL = 0x00;
bool _playCmd = false;
bool _volCmd = false;
bool _folderCmd = false;
uint8_t _requestedFolder = 0x01; // default to folder 01
uint8_t _currentFolder = 0x01; // default to folder 01
bool _repeatCmd = false;
bool _stopplayCmd = false;
bool _resetCmd = false;
bool _eqCmd = false;
uint8_t _requestedEQValue = NORMAL;
uint8_t _currentEQvalue = NORMAL; // start equalizer value
bool _daconCmd = false;
uint8_t _audioMixer = 0x01; // Default to output amplifier 1
bool _setamCmd = false; // Set the Audio mixer channel
uint8_t _outbuffer [11]; // DFPlayer command is 10 bytes + 1 byte register address & UART channel
uint8_t _inbuffer[10]; // expected DFPlayer return 10 bytes
//unsigned long SC16IS752_XTAL_FREQ = 1843200; // To support cheap eBay/AliExpress SC16IS752 boards
unsigned long SC16IS752_XTAL_FREQ = 14745600; // Support for higher baud rates, standard for modular EX-IO system
public:
// Constructor
I2CDFPlayer(VPIN firstVpin, int nPins, I2CAddress i2cAddress, uint8_t UART_CH, uint8_t AM){
_firstVpin = firstVpin;
_nPins = nPins;
_I2CAddress = i2cAddress;
_UART_CH = UART_CH;
_audioMixer = AM;
addDevice(this);
}
public:
static void create(VPIN firstVpin, int nPins, I2CAddress i2cAddress, uint8_t UART_CH, uint8_t AM) {
if (checkNoOverlap(firstVpin, nPins, i2cAddress)) new I2CDFPlayer(firstVpin, nPins, i2cAddress, UART_CH, AM);
}
void _begin() override {
// check if SC16IS752 exist first, initialize and then resume DFPlayer init via SC16IS752
I2CManager.begin();
I2CManager.setClock(1000000);
if (I2CManager.exists(_I2CAddress)){
DIAG(F("SC16IS752 I2C:%s UART detected"), _I2CAddress.toString());
Init_SC16IS752(); // Initialize UART
if (_deviceState == DEVSTATE_FAILED){
DIAG(F("SC16IS752 I2C:%s UART initialization failed"), _I2CAddress.toString());
}
} else {
DIAG(F("SC16IS752 I2C:%s UART not detected"), _I2CAddress.toString());
}
#if defined(DIAG_IO)
_display();
#endif
// Now init DFPlayer
// Send a query to the device to see if it responds
_deviceState = DEVSTATE_INITIALISING;
sendPacket(0x42,0,0);
_timeoutTime = micros() + 5000000UL; // 5 second timeout
_awaitingResponse = true;
}
void _loop(unsigned long currentMicros) override {
// Read responses from device
uint8_t status = _rb.status;
if (status == I2C_STATUS_PENDING) return; // Busy, so don't do anything
if (status == I2C_STATUS_OK) {
processIncoming(currentMicros);
// Check if a command sent to device has timed out. Allow 0.5 second for response
// added retry counter, sometimes we do not sent keep alive due to other commands sent to DFPlayer
if (_awaitingResponse && (int32_t)(currentMicros - _timeoutTime) > 0) { // timeout triggered
if(_retryCounter == 0){ // retry counter out of luck, must take the device to failed state
DIAG(F("I2CDFPlayer:%s, DFPlayer not responding on UART channel: 0x%x"), _I2CAddress.toString(), _UART_CH);
_deviceState = DEVSTATE_FAILED;
_awaitingResponse = false;
_playing = false;
_retryCounter = RETRYCOUNT;
} else { // timeout and retry protection and recovery of corrupt data frames from DFPlayer
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: %s, DFPlayer timout, retry counter: %d on UART channel: 0x%x"), _I2CAddress.toString(), _retryCounter, _UART_CH);
#endif
_timeoutTime = currentMicros + 5000000UL; // Timeout if no response within 5 seconds// reset timeout
_awaitingResponse = false; // trigger sending a keep alive 0x42 in processOutgoing()
_retryCounter --; // decrement retry counter
resetRX_fifo(); // reset the RX fifo as it has corrupt data
}
}
}
status = _rb.status;
if (status == I2C_STATUS_PENDING) return; // Busy, try next time
if (status == I2C_STATUS_OK) {
// Send any commands that need to go.
processOutgoing(currentMicros);
}
delayUntil(currentMicros + 10000); // Only enter every 10ms
}
// Check for incoming data, and update busy flag and other state accordingly
void processIncoming(unsigned long currentMicros) {
// Expected message is in the form "7E FF 06 3D xx xx xx xx xx EF"
RX_fifo_lvl();
if (FIFO_RX_LEVEL >= 10) {
#ifdef DIAG_I2CDFplayer
DIAG(F("I2CDFPlayer: %s Retrieving data from RX Fifo on UART_CH: 0x%x FIFO_RX_LEVEL: %d"),_I2CAddress.toString(), _UART_CH, FIFO_RX_LEVEL);
#endif
_outbuffer[0] = REG_RHR << 3 | _UART_CH << 1;
// Only copy 10 bytes from RX FIFO, there maybe additional partial return data after a track is finished playing in the RX FIFO
I2CManager.read(_I2CAddress, _inbuffer, 10, _outbuffer, 1); // inbuffer[] has the data now
//delayUntil(currentMicros + 10000); // Allow time to get the data
RX_BUFFER = 10; // We have copied 10 bytes from RX FIFO to _inbuffer
#ifdef DIAG_I2CDFplayer_data
DIAG(F("SC16IS752: At I2C: %s, UART channel: 0x%x, RX FIFO Data"), _I2CAddress.toString(), _UART_CH);
for (int i = 0; i < sizeof _inbuffer; i++){
DIAG(F("SC16IS752: Data _inbuffer[0x%x]: 0x%x"), i, _inbuffer[i]);
}
#endif
} else {
FIFO_RX_LEVEL = 0; //set to 0, we'll read a fresh FIFO_RX_LEVEL next time
return; // No data or not enough data in rx fifo, check again next time around
}
bool ok = false;
//DIAG(F("I2CDFPlayer: RX_BUFFER: %d"), RX_BUFFER);
while (RX_BUFFER != 0) {
int c = _inbuffer[_inputIndex]; // Start at 0, increment to FIFO_RX_LEVEL
switch (_inputIndex) {
case 0:
if (c == 0x7E) ok = true;
break;
case 1:
if (c == 0xFF) ok = true;
break;
case 2:
if (c== 0x06) ok = true;
break;
case 3:
_recvCMD = c; // CMD byte
ok = true;
break;
case 6:
switch (_recvCMD) {
//DIAG(F("I2CDFPlayer: %s, _recvCMD: 0x%x _awaitingResponse: 0x0%x"),_I2CAddress.toString(), _recvCMD, _awaitingResponse);
case 0x42:
// Response to status query
_playing = (c != 0);
// Mark the device online and cancel timeout
if (_deviceState==DEVSTATE_INITIALISING) {
_deviceState = DEVSTATE_NORMAL;
#ifdef DIAG_I2CDFplayer
DIAG(F("I2CDFPlayer: %s, UART_CH: 0x0%x, _deviceState: 0x0%x"),_I2CAddress.toString(), _UART_CH, _deviceState);
#endif
#ifdef DIAG_IO
_display();
#endif
}
_awaitingResponse = false;
break;
case 0x3d:
// End of play
if (_playing) {
#ifdef DIAG_IO
DIAG(F("I2CDFPlayer: Finished"));
#endif
_playing = false;
}
break;
case 0x40:
// Error codes; 1: Module Busy
DIAG(F("I2CDFPlayer: Error %d returned from device"), c);
_playing = false;
break;
}
ok = true;
break;
case 4: case 5: case 7: case 8:
ok = true; // Skip over these bytes in message.
break;
case 9:
if (c==0xef) {
// Message finished
_retryCounter = RETRYCOUNT; // reset the retry counter as we have received a valid packet
}
break;
default:
break;
}
if (ok){
_inputIndex++; // character as expected, so increment index
RX_BUFFER --; // Decrease FIFO_RX_LEVEL with each character read from _inbuffer[_inputIndex]
} else {
_inputIndex = 0; // otherwise reset.
RX_BUFFER = 0;
}
}
RX_BUFFER = 0; //Set to 0, we'll read a new RX FIFO level again
}
// Send any commands that need to be sent
void processOutgoing(unsigned long currentMicros) {
// When two commands are sent in quick succession, the device will often fail to
// execute one. Testing has indicated that a delay of 100ms or more is required
// between successive commands to get reliable operation.
// If 100ms has elapsed since the last thing sent, then check if there's some output to do.
if (((int32_t)currentMicros - _commandSendTime) > 100000) {
if ( _resetCmd == true){
sendPacket(0x0C,0,0);
_resetCmd = false;
} else if(_volCmd == true) { // do the volme before palying a track
if(_requestedVolumeLevel >= 0 && _requestedVolumeLevel <= 30){
_currentVolume = _requestedVolumeLevel; // If _requestedVolumeLevel is out of range, sent _currentV1olume
}
sendPacket(0x06, 0x00, _currentVolume);
_volCmd = false;
} else if (_playCmd == true) {
// Change song
if (_requestedSong != -1) {
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: _requestedVolumeLevel: %u, _requestedSong: %u, _currentFolder: %u _playCmd: 0x%x"), _requestedVolumeLevel, _requestedSong, _currentFolder, _playCmd);
#endif
sendPacket(0x0F, _currentFolder, _requestedSong); // audio file in folder
_requestedSong = -1;
_playCmd = false;
}
} //else if (_requestedSong == 0) {
else if (_stopplayCmd == true) {
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: Stop playing: _stopplayCmd: 0x%x"), _stopplayCmd);
#endif
sendPacket(0x16, 0x00, 0x00); // Stop playing
_requestedSong = -1;
_repeat = false; // reset repeat
_stopplayCmd = false;
} else if (_folderCmd == true) {
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: Folder: _folderCmd: 0x%x, _requestedFolder: %d"), _stopplayCmd, _requestedFolder);
#endif
if (_currentFolder != _requestedFolder){
_currentFolder = _requestedFolder;
}
_folderCmd = false;
} else if (_repeatCmd == true) {
if(_repeat == false) { // No repeat play currently
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: Repeat: _repeatCmd: 0x%x, _requestedSong: %d, _repeat: 0x0%x"), _repeatCmd, _requestedSong, _repeat);
#endif
sendPacket(0x08, 0x00, _requestedSong); // repeat playing audio file in root folder
_requestedSong = -1;
_repeat = true;
}
_repeatCmd= false;
} else if (_daconCmd == true) { // Always turn DAC on
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: DACON: _daconCmd: 0x%x"), _daconCmd);
#endif
sendPacket(0x1A,0,0x00);
_daconCmd = false;
} else if (_eqCmd == true){ // Set Equalizer, values 0x00 - 0x05
if (_currentEQvalue != _requestedEQValue){
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: EQ: _eqCmd: 0x%x, _currentEQvalue: 0x0%x, _requestedEQValue: 0x0%x"), _eqCmd, _currentEQvalue, _requestedEQValue);
#endif
_currentEQvalue = _requestedEQValue;
sendPacket(0x07,0x00,_currentEQvalue);
}
_eqCmd = false;
} else if (_setamCmd == true){ // Set Audio mixer channel
setGPIO(); // Set the audio mixer channel
/*
if (_audioMixer == 1){ // set to audio mixer 1
if (_UART_CH == 0){
TEMP_REG_VAL |= (0x01 << _UART_CH); //Set GPIO pin 0 to high
} else { // must be UART 1
TEMP_REG_VAL |= (0x01 << _UART_CH); //Set GPIO pin 1 to high
}
//_setamCmd = false;
//UART_WriteRegister(REG_IOSTATE, TEMP_REG_VAL);
} else { // set to audio mixer 2
if (_UART_CH == 0){
TEMP_REG_VAL &= (0x00 << _UART_CH); //Set GPIO pin 0 to Low
} else { // must be UART 1
TEMP_REG_VAL &= (0x00 << _UART_CH); //Set GPIO pin 1 to Low
}
//_setamCmd = false;
//UART_WriteRegister(REG_IOSTATE, TEMP_REG_VAL);
}*/
_setamCmd = false;
UART_WriteRegister(REG_IOSTATE, TEMP_REG_VAL);
} else if ((int32_t)currentMicros - _commandSendTime > 1000000) {
// Poll device every second that other commands aren't being sent,
// to check if it's still connected and responding.
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: Send keepalive") );
#endif
sendPacket(0x42,0,0);
if (!_awaitingResponse) {
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: Send keepalive, _awaitingResponse: 0x0%x"), _awaitingResponse );
#endif
_timeoutTime = currentMicros + 5000000UL; // Timeout if no response within 5 seconds
_awaitingResponse = true;
}
}
}
}
// Write to a vPin will do nothing
void _write(VPIN vpin, int value) override {
if (_deviceState == DEVSTATE_FAILED) return;
#ifdef DIAG_IO
DIAG(F("I2CDFPlayer: Writing to any vPin not supported"));
#endif
}
// WriteAnalogue on first pin uses the nominated value as a file number to start playing, if file number > 0.
// Volume may be specified as second parameter to writeAnalogue.
// If value is zero, the player stops playing.
// WriteAnalogue on second pin sets the output volume.
//
// WriteAnalogue to be done on first vpin
//
//void _writeAnalogue(VPIN vpin, int value, uint8_t volume=0, uint16_t=0) override {
void _writeAnalogue(VPIN vpin, int value, uint8_t volume=0, uint16_t cmd=0) override {
if (_deviceState == DEVSTATE_FAILED) return;
#ifdef DIAG_IO
DIAG(F("I2CDFPlayer: VPIN:%u FileNo:%d Volume:%d Command:0x%x"), vpin, value, volume, cmd);
#endif
uint8_t pin = vpin - _firstVpin;
if (pin == 0) { // Enhanced DFPlayer commands, do nothing if not vPin 0
// Read command and value
switch (cmd){
//case NONE:
// DFPlayerCmd = cmd;
// break;
case PLAY:
_playCmd = true;
_volCmd = true;
_requestedSong = value;
_requestedVolumeLevel = volume;
_playing = true;
break;
case VOL:
_volCmd = true;
_requestedVolumeLevel = volume;
break;
case FOLDER:
_folderCmd = true;
if (volume <= 0 || volume > 99){ // Range checking, valid values 1-99, else default to 1
_requestedFolder = 0x01; // if outside range, default to folder 01
} else {
_requestedFolder = volume;
}
break;
case REPEATPLAY: // Need to check if _repeat == true, if so do nothing
if (_repeat == false) {
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: WriteAnalog Repeat: _repeat: 0x0%x, value: %d _repeatCmd: 0x%x"), _repeat, value, _repeatCmd);
#endif
_repeatCmd = true;
_requestedSong = value;
_requestedVolumeLevel = volume;
_playing = true;
}
break;
case STOPPLAY:
_stopplayCmd = true;
break;
case EQ:
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: WriteAnalog EQ: cmd: 0x%x, EQ value: 0x%x"), cmd, volume);
#endif
_eqCmd = true;
if (volume <= 0 || volume > 5) { // If out of range, default to NORMAL
_requestedEQValue = NORMAL;
} else { // Valid EQ parameter range
_requestedEQValue = volume;
}
break;
case RESET:
_resetCmd = true;
break;
case DACON: // Works, but without the DACOFF command limited value, except when not relying on DFPlayer default to turn the DAC on
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: WrtieAnalog DACON: cmd: 0x%x"), cmd);
#endif
_daconCmd = true;
break;
case SETAM: // Set the audio mixer channel to 1 or 2
_setamCmd = true;
#ifdef DIAG_I2CDFplayer_playing
DIAG(F("I2CDFPlayer: WrtieAnalog SETAM: cmd: 0x%x"), cmd);
#endif
if (volume <= 0 || volume > 2) { // If out of range, default to 1
_audioMixer = 1;
} else { // Valid SETAM parameter in range
_audioMixer = volume; // _audioMixer valid values 1 or 2
}
break;
default:
break;
}
}
}
// A read on any pin indicates if the player is still playing.
int _read(VPIN vpin) override {
if (_deviceState == DEVSTATE_FAILED) return false;
uint8_t pin = vpin - _firstVpin;
if (pin == 0) { // Do nothing if not vPin 0
return _playing;
}
}
void _display() override {
DIAG(F("I2CDFPlayer Configured on Vpins:%u-%u %S"), _firstVpin, _firstVpin+_nPins-1,
(_deviceState==DEVSTATE_FAILED) ? F("OFFLINE") : F(""));
}
private:
// DFPlayer command frame
// 7E FF 06 0F 00 01 01 xx xx EF
// 0 -> 7E is start code
// 1 -> FF is version
// 2 -> 06 is length
// 3 -> 0F is command
// 4 -> 00 is no receive
// 5~6 -> 01 01 is argument
// 7~8 -> checksum = 0 - ( FF+06+0F+00+01+01 )
// 9 -> EF is end code
void sendPacket(uint8_t command, uint8_t arg1 = 0, uint8_t arg2 = 0) {
FIFO_TX_LEVEL = 0; // Reset FIFO_TX_LEVEL
uint8_t out[] = {
0x7E,
0xFF,
06,
command,
00,
//static_cast(arg >> 8),
//static_cast(arg & 0x00ff),
arg1,
arg2,
00,
00,
0xEF };
setChecksum(out);
// Prepend the DFPlayer command with REG address and UART Channel in _outbuffer
_outbuffer[0] = REG_THR << 3 | _UART_CH << 1; //TX FIFO and UART Channel
for ( int i = 1; i < sizeof(out)+1 ; i++){
_outbuffer[i] = out[i-1];
}
#ifdef DIAG_I2CDFplayer_data
DIAG(F("SC16IS752: I2C: %s Sent packet function"), _I2CAddress.toString());
for (int i = 0; i < sizeof _outbuffer; i++){
DIAG(F("SC16IS752: Data _outbuffer[0x%x]: 0x%x"), i, _outbuffer[i]);
}
#endif
TX_fifo_lvl();
if(FIFO_TX_LEVEL > 0){ //FIFO is empty
I2CManager.write(_I2CAddress, _outbuffer, sizeof(_outbuffer), &_rb);
//I2CManager.write(_I2CAddress, _outbuffer, sizeof(_outbuffer));
#ifdef DIAG_I2CDFplayer
DIAG(F("SC16IS752: I2C: %s data transmit complete on UART: 0x%x"), _I2CAddress.toString(), _UART_CH);
#endif
} else {
DIAG(F("I2CDFPlayer at: %s, TX FIFO not empty on UART: 0x%x"), _I2CAddress.toString(), _UART_CH);
_deviceState = DEVSTATE_FAILED; // This should not happen
}
_commandSendTime = micros();
}
uint16_t calcChecksum(uint8_t* packet)
{
uint16_t sum = 0;
for (int i = 1; i < 7; i++)
{
sum += packet[i];
}
return -sum;
}
void setChecksum(uint8_t* out)
{
uint16_t sum = calcChecksum(out);
out[7] = (sum >> 8);
out[8] = (sum & 0xff);
}
// SC16IS752 functions
// Initialise SC16IS752 only for this channel
// First a software reset
// Enable FIFO and clear TX & RX FIFO
// Need to set the following registers
// IOCONTROL set bit 1 and 2 to 0 indicating that they are GPIO
// IODIR set all bit to 1 indicating al are output
// IOSTATE set only bit 0 to 1 for UART 0, or only bit 1 for UART 1 //
// LCR bit 7=0 divisor latch (clock division registers DLH & DLL, they store 16 bit divisor),
// WORD_LEN, STOP_BIT, PARITY_ENA and PARITY_TYPE
// MCR bit 7=0 clock divisor devide-by-1 clock input
// DLH most significant part of divisor
// DLL least significant part of divisor
//
// BAUD_RATE, WORD_LEN, STOP_BIT, PARITY_ENA and PARITY_TYPE have been defined and initialized
//
void Init_SC16IS752(){ // Return value is in _deviceState
#ifdef DIAG_I2CDFplayer
DIAG(F("SC16IS752: Initialize I2C: %s , UART Ch: 0x%x"), _I2CAddress.toString(), _UART_CH);
#endif
uint16_t _divisor = (SC16IS752_XTAL_FREQ / PRESCALER) / (BAUD_RATE * 16);
TEMP_REG_VAL = 0x08; // UART Software reset
UART_WriteRegister(REG_IOCONTROL, TEMP_REG_VAL);
TEMP_REG_VAL = 0x00; // Set pins to GPIO mode
UART_WriteRegister(REG_IOCONTROL, TEMP_REG_VAL);
TEMP_REG_VAL = 0xFF; //Set all pins as output
UART_WriteRegister(REG_IODIR, TEMP_REG_VAL);
UART_ReadRegister(REG_IOSTATE); // Read current state as not to overwrite the other GPIO pins
TEMP_REG_VAL = _inbuffer[0];
setGPIO(); // Set the audio mixer channel
/*
if (_UART_CH == 0){ // Set Audio mixer channel
TEMP_REG_VAL |= (0x01 << _UART_CH); //Set GPIO pin 0 to high
} else { // must be UART 1
TEMP_REG_VAL |= (0x01 << _UART_CH); //Set GPIO pin 1 to high
}
UART_WriteRegister(REG_IOSTATE, TEMP_REG_VAL);
*/
TEMP_REG_VAL = 0x07; // Reset FIFO, clear RX & TX FIFO
UART_WriteRegister(REG_FCR, TEMP_REG_VAL);
TEMP_REG_VAL = 0x00; // Set MCR to all 0, includes Clock divisor
UART_WriteRegister(REG_MCR, TEMP_REG_VAL);
TEMP_REG_VAL = 0x80 | WORD_LEN | STOP_BIT | PARITY_ENA | PARITY_TYPE;
UART_WriteRegister(REG_LCR, TEMP_REG_VAL); // Divisor latch enabled
UART_WriteRegister(REG_DLL, (uint8_t)_divisor); // Write DLL
UART_WriteRegister(REG_DLH, (uint8_t)(_divisor >> 8)); // Write DLH
UART_ReadRegister(REG_LCR);
TEMP_REG_VAL = _inbuffer[0] & 0x7F; // Disable Divisor latch enabled bit
UART_WriteRegister(REG_LCR, TEMP_REG_VAL); // Divisor latch disabled
uint8_t status = _rb.status;
if (status != I2C_STATUS_OK) {
DIAG(F("SC16IS752: I2C: %s failed %S"), _I2CAddress.toString(), I2CManager.getErrorMessage(status));
_deviceState = DEVSTATE_FAILED;
} else {
#ifdef DIAG_IO
DIAG(F("SC16IS752: I2C: %s, _deviceState: %S"), _I2CAddress.toString(), I2CManager.getErrorMessage(status));
#endif
_deviceState = DEVSTATE_NORMAL; // If I2C state is OK, then proceed to initialize DFPlayer
}
}
// Read the Receive FIFO Level register (RXLVL), return a single unsigned integer
// of nr of characters in the RX FIFO, bit 6:0, 7 not used, set to zero
// value from 0 (0x00) to 64 (0x40) Only display if RX FIFO has data
// The RX fifo level is used to check if there are enough bytes to process a frame
void RX_fifo_lvl(){
UART_ReadRegister(REG_RXLV);
FIFO_RX_LEVEL = _inbuffer[0];
#ifdef DIAG_I2CDFplayer
if (FIFO_RX_LEVEL > 0){
//if (FIFO_RX_LEVEL > 0 && FIFO_RX_LEVEL < 10){
DIAG(F("SC16IS752: At I2C: %s, UART channel: 0x%x, FIFO_RX_LEVEL: 0d%d"), _I2CAddress.toString(), _UART_CH, _inbuffer[0]);
}
#endif
}
// When a frame is transmitted from the DFPlayer to the serial port, and at the same time the CS is sending a 42 query
// the following two frames from the DFPlayer are corrupt. This result in the receive buffer being out of sync and the
// CS will complain and generate a timeout.
// The RX fifo has corrupt data and need to be flushed, this function does that
//
void resetRX_fifo(){
#ifdef DIAG_I2CDFplayer
DIAG(F("SC16IS752: At I2C: %s, UART channel: 0x%x, RX fifo reset"), _I2CAddress.toString(), _UART_CH);
#endif
TEMP_REG_VAL = 0x03; // Reset RX fifo
UART_WriteRegister(REG_FCR, TEMP_REG_VAL);
}
// Set or reset GPIO pin 0 and 1 depending on the UART ch
// This function may be modified in a future release to enable all 8 pins to be set or reset with EX-Rail
// for various auxilary functions
void setGPIO(){
UART_ReadRegister(REG_IOSTATE); // Get the current GPIO pins state from the IOSTATE register
TEMP_REG_VAL = _inbuffer[0];
if (_audioMixer == 1){ // set to audio mixer 1
if (_UART_CH == 0){
TEMP_REG_VAL |= (0x01 << _UART_CH); //Set GPIO pin 0 to high
} else { // must be UART 1
TEMP_REG_VAL |= (0x01 << _UART_CH); //Set GPIO pin 1 to high
}
} else { // set to audio mixer 2
if (_UART_CH == 0){
TEMP_REG_VAL &= ~(0x01 << _UART_CH); //Set GPIO pin 0 to Low
} else { // must be UART 1
TEMP_REG_VAL &= ~(0x01 << _UART_CH); //Set GPIO pin 1 to Low
}
}
UART_WriteRegister(REG_IOSTATE, TEMP_REG_VAL);
_setamCmd = false;
}
// Read the Tranmit FIFO Level register (TXLVL), return a single unsigned integer
// of nr characters free in the TX FIFO, bit 6:0, 7 not used, set to zero
// value from 0 (0x00) to 64 (0x40)
//
void TX_fifo_lvl(){
UART_ReadRegister(REG_TXLV);
FIFO_TX_LEVEL = _inbuffer[0];
#ifdef DIAG_I2CDFplayer
// DIAG(F("SC16IS752: At I2C: %s, UART channel: 0x%x, FIFO_TX_LEVEL: 0d%d"), _I2CAddress.toString(), _UART_CH, FIFO_TX_LEVEL);
#endif
}
//void UART_WriteRegister(I2CAddress _I2CAddress, uint8_t _UART_CH, uint8_t UART_REG, uint8_t Val, I2CRB &_rb){
void UART_WriteRegister(uint8_t UART_REG, uint8_t Val){
_outbuffer[0] = UART_REG << 3 | _UART_CH << 1;
_outbuffer[1] = Val;
#ifdef DIAG_I2CDFplayer_reg
DIAG(F("SC16IS752: Write register at I2C: %s, UART channel: 0x%x, Register: 0x%x, Data: 0b%b"), _I2CAddress.toString(), _UART_CH, UART_REG, _outbuffer[1]);
#endif
I2CManager.write(_I2CAddress, _outbuffer, 2);
}
void UART_ReadRegister(uint8_t UART_REG){
_outbuffer[0] = UART_REG << 3 | _UART_CH << 1; // _outbuffer[0] has now UART_REG and UART_CH
I2CManager.read(_I2CAddress, _inbuffer, 1, _outbuffer, 1);
// _inbuffer has the REG data
#ifdef DIAG_I2CDFplayer_reg
DIAG(F("SC16IS752: Read register at I2C: %s, UART channel: 0x%x, Register: 0x%x, Data: 0b%b"), _I2CAddress.toString(), _UART_CH, UART_REG, _inbuffer[0]);
#endif
}
// SC16IS752 General register set (from the datasheet)
enum : uint8_t{
REG_RHR = 0x00, // FIFO Read
REG_THR = 0x00, // FIFO Write
REG_IER = 0x01, // Interrupt Enable Register R/W
REG_FCR = 0x02, // FIFO Control Register Write
REG_IIR = 0x02, // Interrupt Identification Register Read
REG_LCR = 0x03, // Line Control Register R/W
REG_MCR = 0x04, // Modem Control Register R/W
REG_LSR = 0x05, // Line Status Register Read
REG_MSR = 0x06, // Modem Status Register Read
REG_SPR = 0x07, // Scratchpad Register R/W
REG_TCR = 0x06, // Transmission Control Register R/W
REG_TLR = 0x07, // Trigger Level Register R/W
REG_TXLV = 0x08, // Transmitter FIFO Level register Read
REG_RXLV = 0x09, // Receiver FIFO Level register Read
REG_IODIR = 0x0A, // Programmable I/O pins Direction register R/W
REG_IOSTATE = 0x0B, // Programmable I/O pins State register R/W
REG_IOINTENA = 0x0C, // I/O Interrupt Enable register R/W
REG_IOCONTROL = 0x0E, // I/O Control register R/W
REG_EFCR = 0x0F, // Extra Features Control Register R/W
};
// SC16IS752 Special register set
enum : uint8_t{
REG_DLL = 0x00, // Division registers R/W
REG_DLH = 0x01, // Division registers R/W
};
// SC16IS752 Enhanced regiter set
enum : uint8_t{
REG_EFR = 0X02, // Enhanced Features Register R/W
REG_XON1 = 0x04, // R/W
REG_XON2 = 0x05, // R/W
REG_XOFF1 = 0x06, // R/W
REG_XOFF2 = 0x07, // R/W
};
// DFPlayer commands and values
enum : uint8_t{
PLAY = 0x0F,
VOL = 0x06,
FOLDER = 0x2B, // Not a DFPlayer command, used to set folder nr where audio file is
REPEATPLAY = 0x08,
STOPPLAY = 0x16,
EQ = 0x07, // Set equaliser, require parameter NORMAL, POP, ROCK, JAZZ, CLASSIC or BASS
RESET = 0x0C,
DACON = 0x1A,
SETAM = 0x2A, // Set audio mixer 1 or 2 for this DFPLayer
NORMAL = 0x00, // Equalizer parameters
POP = 0x01,
ROCK = 0x02,
JAZZ = 0x03,
CLASSIC = 0x04,
BASS = 0x05,
};
};
#endif // IO_I2CDFPlayer_h