AUDIO LIB
Fork of VS1053 by
VS1053.cpp
- Committer:
- kayekss
- Date:
- 2013-12-04
- Revision:
- 3:696c8e6744b2
- Parent:
- 2:47ba7e2259cd
- Child:
- 4:6e0fb5342efa
File content as of revision 3:696c8e6744b2:
// ==================================================== Dec 05 2013, kayeks == // VS1053.cpp // =========================================================================== // Just a simple library for VLSI's mp3/midi codec chip // - Minimal and simple implementation (and dirty too) #include "mbed.h" #include "VS1053.h" /** Constructor of class VS1053. */ VS1053::VS1053(PinName mosiPin, PinName misoPin, PinName sckPin, PinName csPin, PinName bsyncPin, PinName dreqPin, PinName rstPin, uint32_t spiFrequency) : spi(mosiPin, misoPin, sckPin), cs(csPin), bsync(bsyncPin), dreq(dreqPin), rst(rstPin) { spi.format(8, 0); spi.frequency(spiFrequency); // Initialize outputs cs = 1; bsync = 1; rst = 1; } /** Destructor of class VS1053. */ VS1053::~VS1053() { } /** Make a hardware reset by hitting VS1053's RESET pin. */ void VS1053::hardwareReset() { rst = 0; wait(.05); rst = 1; wait(.05); } /** Send a data byte to VS1053. */ void VS1053::sendDataByte(uint8_t data) { while (!dreq); bsync = 0; spi.write(data); bsync = 1; } /** Send a data block specified as a pointer to VS1053. * @return Data length successfully sent. */ size_t VS1053::sendDataBlock(uint8_t* pData, size_t length) { size_t sizeSent = 0; if (!pData || !length) return 0; while (length) { while (!dreq); bsync = 0; for (uint8_t i = 0; i < 32 && length--; i++) { spi.write(*pData++); sizeSent++; } bsync = 1; } return sizeSent; } /** Change VS1053's PLL setting for speedup. */ void VS1053::clockUp() { // Set CLKI to 43.0-55.3 MHz writeReg(SCI_CLOCKF, 0x8800); // SC_MULT=4 (3.5x), SC_ADD=1 (+1.0x) } /** Send cancel request to VS1053. * @return Zero at failure, non-zero at success. */ bool VS1053::sendCancel() { uint16_t reg; // Set SM_CANCEL bit reg = readReg(SCI_MODE); if (reg & 0x0008) { // Abort if SM_CANCEL is still set return false; } writeReg(SCI_MODE, reg | 0x0008); return true; } /** Attempts a termination of playing. * Call this repeatedly during data stream tramsission until it successes. * @return Zero at failure, non-zero at success. */ bool VS1053::stop() { uint16_t reg; uint8_t endFillByte; size_t length; // If SM_CANCEL is still set, do nothing reg = readReg(SCI_MODE); if (reg & 0x0008) { return false; } // Read endFillByte from XRAM <1E06h> writeReg(SCI_WRAMADDR, 0x1e06); reg = readReg(SCI_WRAM); // Send lower 8 bits of endFillByte 2,052 times endFillByte = reg & 0xff; length = 2052; while (length) { while (!dreq); bsync = 0; for (uint8_t i = 0; i < 32 && length--; i++) { spi.write(endFillByte); } bsync = 1; } // Check if both HDAT0 and HDAT1 are cleared return readReg(SCI_HDAT0) == 0x0000 && readReg(SCI_HDAT1) == 0x0000; } /** Write to an SCI (Serial Control Interface) register entry. */ void VS1053::writeReg(uint8_t addr, uint16_t word) { // If addr is out-of-range, do nothing if (addr > 0x0f) { return; } while (!dreq); cs = 0; spi.write(0x02); // Send a "Write SCI" instruction (02h), spi.write(addr); // target address, spi.write(word >> 8); // high byte, spi.write(word & 0xff); // then low byte while (!dreq); cs = 1; } /** Read an SCI (Serial Control Interface) register entry. * @return Register value or 0000h when invalid address was specified. */ uint16_t VS1053::readReg(uint8_t addr) { uint16_t word; // If addr is out-of-range, return 0000h if (addr > 0x0f) { return 0x0000; } while (!dreq); cs = 0; spi.write(0x03); // Send a "Read SCI" instruction (03h) spi.write(addr); // and target address word = spi.write(0xff) << 8; // Receive high byte with dummy data FFh word |= spi.write(0xff); // Receive low byte while (!dreq); cs = 1; return word; }