VS1053.cpp

/**
 * This is a driver library for VS1053 MP3 Codec Breakout
 * (Ogg Vorbis / MP3 / AAC / WMA / FLAC / MIDI Audio Codec Chip).
 * Adapted for Espressif ESP8266 and ESP32 boards.
 *
 * version 1.0.1
 *
 * Licensed under GNU GPLv3 <http://gplv3.fsf.org/>
 * Copyright © 2018
 *
 * @authors baldram, edzelf, MagicCube, maniacbug
 *
 * Development log:
 *  - 2011: initial VS1053 Arduino library
 *          originally written by J. Coliz (github: @maniacbug),
 *  - 2016: refactored and integrated into Esp-radio sketch
 *          by Ed Smallenburg (github: @edzelf)
 *  - 2017: refactored to use as PlatformIO library
 *          by Marcin Szalomski (github: @baldram | twitter: @baldram)
 *
 * This program 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 later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "VS1053.h"

VS1053::VS1053(uint8_t _cs_pin, uint8_t _dcs_pin, uint8_t _dreq_pin)
        : cs_pin(_cs_pin), dcs_pin(_dcs_pin), dreq_pin(_dreq_pin) {
}

uint16_t VS1053::read_register(uint8_t _reg) const {
    uint16_t result;

    control_mode_on();
    SPI.write(3);    // Read operation
    SPI.write(_reg); // Register to write (0..0xF)
    // Note: transfer16 does not seem to work
    result = (SPI.transfer(0xFF) << 8) | // Read 16 bits data
             (SPI.transfer(0xFF));
    await_data_request(); // Wait for DREQ to be HIGH again
    control_mode_off();
    return result;
}

void VS1053::write_register(uint8_t _reg, uint16_t _value) const {
    control_mode_on();
    SPI.write(2);        // Write operation
    SPI.write(_reg);     // Register to write (0..0xF)
    SPI.write16(_value); // Send 16 bits data
    await_data_request();
    control_mode_off();
}

void VS1053::sdi_send_buffer(uint8_t *data, size_t len) {
    size_t chunk_length; // Length of chunk 32 byte or shorter

    data_mode_on();
    while (len) // More to do?
    {
        await_data_request(); // Wait for space available
        chunk_length = len;
        if (len > vs1053_chunk_size) {
            chunk_length = vs1053_chunk_size;
        }
        len -= chunk_length;
        SPI.writeBytes(data, chunk_length);
        data += chunk_length;
    }
    data_mode_off();
}

void VS1053::sdi_send_fillers(size_t len) {
    size_t chunk_length; // Length of chunk 32 byte or shorter

    data_mode_on();
    while (len) // More to do?
    {
        await_data_request(); // Wait for space available
        chunk_length = len;
        if (len > vs1053_chunk_size) {
            chunk_length = vs1053_chunk_size;
        }
        len -= chunk_length;
        while (chunk_length--) {
            SPI.write(endFillByte);
        }
    }
    data_mode_off();
}

void VS1053::wram_write(uint16_t address, uint16_t data) {
    write_register(SCI_WRAMADDR, address);
    write_register(SCI_WRAM, data);
}

uint16_t VS1053::wram_read(uint16_t address) {
    write_register(SCI_WRAMADDR, address); // Start reading from WRAM
    return read_register(SCI_WRAM);        // Read back result
}

bool VS1053::testComm(const char *header) {
    // Test the communication with the VS1053 module.  The result wille be returned.
    // If DREQ is low, there is problably no VS1053 connected.  Pull the line HIGH
    // in order to prevent an endless loop waiting for this signal.  The rest of the
    // software will still work, but readbacks from VS1053 will fail.
    int i; // Loop control
    uint16_t r1, r2, cnt = 0;
    uint16_t delta = 300; // 3 for fast SPI

    if (!digitalRead(dreq_pin)) {
        LOG("VS1053 not properly installed!\n");
        // Allow testing without the VS1053 module
        pinMode(dreq_pin, INPUT_PULLUP); // DREQ is now input with pull-up
        return false;                    // Return bad result
    }
    // Further TESTING.  Check if SCI bus can write and read without errors.
    // We will use the volume setting for this.
    // Will give warnings on serial output if DEBUG is active.
    // A maximum of 20 errors will be reported.
    if (strstr(header, "Fast")) {
        delta = 3; // Fast SPI, more loops
    }

    LOG("%s", header);  // Show a header

    for (i = 0; (i < 0xFFFF) && (cnt < 20); i += delta) {
        write_register(SCI_VOL, i);         // Write data to SCI_VOL
        r1 = read_register(SCI_VOL);        // Read back for the first time
        r2 = read_register(SCI_VOL);        // Read back a second time
        if (r1 != r2 || i != r1 || i != r2) // Check for 2 equal reads
        {
            LOG("VS1053 error retry SB:%04X R1:%04X R2:%04X\n", i, r1, r2);
            cnt++;
            delay(10);
        }
        yield(); // Allow ESP firmware to do some bookkeeping
    }
    return (cnt == 0); // Return the result
}

void VS1053::begin() {
    pinMode(dreq_pin, INPUT); // DREQ is an input
    pinMode(cs_pin, OUTPUT);  // The SCI and SDI signals
    pinMode(dcs_pin, OUTPUT);
    digitalWrite(dcs_pin, HIGH); // Start HIGH for SCI en SDI
    digitalWrite(cs_pin, HIGH);
    delay(100);
    LOG("\n");
    LOG("Reset VS1053...\n");
    digitalWrite(dcs_pin, LOW); // Low & Low will bring reset pin low
    digitalWrite(cs_pin, LOW);
    delay(500);
    LOG("End reset VS1053...\n");
    digitalWrite(dcs_pin, HIGH); // Back to normal again
    digitalWrite(cs_pin, HIGH);
    delay(500);
    // Init SPI in slow mode ( 0.2 MHz )
    VS1053_SPI = SPISettings(200000, MSBFIRST, SPI_MODE0);
    // printDetails("Right after reset/startup");
    delay(20);
    // printDetails("20 msec after reset");
    if (testComm("Slow SPI,Testing VS1053 read/write registers...\n")) {
        //softReset();
        // Switch on the analog parts
        write_register(SCI_AUDATA, 44101); // 44.1kHz stereo
        // The next clocksetting allows SPI clocking at 5 MHz, 4 MHz is safe then.
        write_register(SCI_CLOCKF, 6 << 12); // Normal clock settings multiplyer 3.0 = 12.2 MHz
        // SPI Clock to 4 MHz. Now you can set high speed SPI clock.
        VS1053_SPI = SPISettings(4000000, MSBFIRST, SPI_MODE0);
        write_register(SCI_MODE, _BV(SM_SDINEW) | _BV(SM_LINE1));
        testComm("Fast SPI, Testing VS1053 read/write registers again...\n");
        delay(10);
        await_data_request();
        endFillByte = wram_read(0x1E06) & 0xFF;
        LOG("endFillByte is %X\n", endFillByte);
        //printDetails("After last clocksetting") ;
        delay(100);
    }
}

void VS1053::setVolume(uint8_t vol) {
    // Set volume.  Both left and right.
    // Input value is 0..100.  100 is the loudest.
    uint8_t valueL, valueR; // Values to send to SCI_VOL

    curvol = vol;                         // Save for later use
    valueL = vol;
    valueR = vol;

    if (curbalance < 0) {
        valueR = max(0, vol + curbalance);
    } else if (curbalance > 0) {
        valueL = max(0, vol - curbalance);
    }

    valueL = map(valueL, 0, 100, 0xFE, 0x00); // 0..100% to left channel
    valueR = map(valueR, 0, 100, 0xFE, 0x00); // 0..100% to right channel

    write_register(SCI_VOL, (valueL << 8) | valueR); // Volume left and right
}

void VS1053::setBalance(int8_t balance) {
    if (balance > 100) {
        curbalance = 100;
    } else if (balance < -100) {
        curbalance = -100;
    } else {
        curbalance = balance;
    }
}

void VS1053::setTone(uint8_t *rtone) { // Set bass/treble (4 nibbles)
    // Set tone characteristics.  See documentation for the 4 nibbles.
    uint16_t value = 0; // Value to send to SCI_BASS
    int i;              // Loop control

    for (i = 0; i < 4; i++) {
        value = (value << 4) | rtone[i]; // Shift next nibble in
    }
    write_register(SCI_BASS, value); // Volume left and right
}

uint8_t VS1053::getVolume() { // Get the currenet volume setting.
    return curvol;
}

int8_t VS1053::getBalance() { // Get the currenet balance setting.
    return curbalance;
}

void VS1053::startSong() {
    sdi_send_fillers(10);
}

void VS1053::playChunk(uint8_t *data, size_t len) {
    sdi_send_buffer(data, len);
}

void VS1053::stopSong() {
    uint16_t modereg; // Read from mode register
    int i;            // Loop control

    sdi_send_fillers(2052);
    delay(10);
    write_register(SCI_MODE, _BV(SM_SDINEW) | _BV(SM_CANCEL));
    for (i = 0; i < 200; i++) {
        sdi_send_fillers(32);
        modereg = read_register(SCI_MODE); // Read status
        if ((modereg & _BV(SM_CANCEL)) == 0) {
            sdi_send_fillers(2052);
            LOG("Song stopped correctly after %d msec\n", i * 10);
            return;
        }
        delay(10);
    }
    printDetails("Song stopped incorrectly!");
}

void VS1053::softReset() {
    LOG("Performing soft-reset\n");
    write_register(SCI_MODE, _BV(SM_SDINEW) | _BV(SM_RESET));
    delay(10);
    await_data_request();
}

void VS1053::printDetails(const char *header) {
    uint16_t regbuf[16];
    uint8_t i;

    LOG("%s", header);
    LOG("REG   Contents\n");
    LOG("---   -----\n");
    for (i = 0; i <= SCI_num_registers; i++) {
        regbuf[i] = read_register(i);
    }
    for (i = 0; i <= SCI_num_registers; i++) {
        delay(5);
        LOG("%3X - %5X\n", i, regbuf[i]);
    }
}

/**
 * An optional switch.
 * Most VS1053 modules will start up in MIDI mode. The result is that there is no audio when playing MP3.
 * You can modify the board, but there is a more elegant way without soldering.
 * No side effects for boards which do not need this switch. It means you can call it just in case.
 *
 * Read more here: http://www.bajdi.com/lcsoft-vs1053-mp3-module/#comment-33773
 */
void VS1053::switchToMp3Mode() {
    wram_write(0xC017, 3); // GPIO DDR = 3
    wram_write(0xC019, 0); // GPIO ODATA = 0
    delay(100);
    LOG("Switched to mp3 mode\n");
    softReset();
}

/**
 * A lightweight method to check if VS1053 is correctly wired up (power supply and connection to SPI interface).
 *
 * @return true if the chip is wired up correctly
 */
bool VS1053::isChipConnected() {
    uint16_t status = read_register(SCI_STATUS);

    return !(status == 0 || status == 0xFFFF);
}

/**
 * Provides current decoded time in full seconds (from SCI_DECODE_TIME register value)
 *
 * When decoding correct data, current decoded time is shown in SCI_DECODE_TIME
 * register in full seconds. The user may change the value of this register.
 * In that case the new value should be written twice to make absolutely certain
 * that the change is not overwritten by the firmware. A write to SCI_DECODE_TIME
 * also resets the byteRate calculation.
 *
 * SCI_DECODE_TIME is reset at every hardware and software reset. It is no longer
 * cleared when decoding of a file ends to allow the decode time to proceed
 * automatically with looped files and with seamless playback of multiple files.
 * With fast playback (see the playSpeed extra parameter) the decode time also
 * counts faster. Some codecs (WMA and Ogg Vorbis) can also indicate the absolute
 * play position, see the positionMsec extra parameter in section 10.11.
 *
 * @see VS1053b Datasheet (1.31) / 9.6.5 SCI_DECODE_TIME (RW)
 *
 * @return current decoded time in full seconds
 */
uint16_t VS1053::getDecodedTime() {
    return read_register(SCI_DECODE_TIME);
}

/**
 * Clears decoded time (sets SCI_DECODE_TIME register to 0x00)
 *
 * The user may change the value of this register. In that case the new value
 * should be written twice to make absolutely certain that the change is not
 * overwritten by the firmware. A write to SCI_DECODE_TIME also resets the
 * byteRate calculation.
 */
void VS1053::clearDecodedTime() {
    write_register(SCI_DECODE_TIME, 0x00);
    write_register(SCI_DECODE_TIME, 0x00);
}