Just a simple library for VLSI's mp3/midi codec chip
Dependents: IsuProject_LPC1768
VS1053.cpp@0:708868399033, 2013-11-08 (annotated)
- Committer:
- kayekss
- Date:
- Fri Nov 08 10:41:54 2013 +0000
- Revision:
- 0:708868399033
- Child:
- 1:00c19f771676
Just a simple library for VLSI's mp3/midi codec chip
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kayekss | 0:708868399033 | 1 | // ==================================================== Nov 04 2013, kayeks == |
kayekss | 0:708868399033 | 2 | // VS1053.cpp |
kayekss | 0:708868399033 | 3 | // =========================================================================== |
kayekss | 0:708868399033 | 4 | // Just a simple library for VLSI's mp3/midi codec chip |
kayekss | 0:708868399033 | 5 | // - Minimal and simple implementation (and dirty too) |
kayekss | 0:708868399033 | 6 | |
kayekss | 0:708868399033 | 7 | #include "mbed.h" |
kayekss | 0:708868399033 | 8 | #include "VS1053.h" |
kayekss | 0:708868399033 | 9 | |
kayekss | 0:708868399033 | 10 | /** Constructor of class VS1053 */ |
kayekss | 0:708868399033 | 11 | VS1053::VS1053(PinName mosiPin, PinName misoPin, PinName sckPin, |
kayekss | 0:708868399033 | 12 | PinName csPin, PinName bsyncPin, PinName dreqPin, |
kayekss | 0:708868399033 | 13 | PinName rstPin, uint32_t spiFrequency) |
kayekss | 0:708868399033 | 14 | : |
kayekss | 0:708868399033 | 15 | spi(mosiPin, misoPin, sckPin), |
kayekss | 0:708868399033 | 16 | cs(csPin), |
kayekss | 0:708868399033 | 17 | bsync(bsyncPin), |
kayekss | 0:708868399033 | 18 | dreq(dreqPin), |
kayekss | 0:708868399033 | 19 | rst(rstPin) |
kayekss | 0:708868399033 | 20 | { |
kayekss | 0:708868399033 | 21 | spi.format(8, 0); |
kayekss | 0:708868399033 | 22 | spi.frequency(spiFrequency); |
kayekss | 0:708868399033 | 23 | |
kayekss | 0:708868399033 | 24 | // Initialize outputs |
kayekss | 0:708868399033 | 25 | cs = 1; |
kayekss | 0:708868399033 | 26 | bsync = 1; |
kayekss | 0:708868399033 | 27 | rst = 1; |
kayekss | 0:708868399033 | 28 | } |
kayekss | 0:708868399033 | 29 | |
kayekss | 0:708868399033 | 30 | /** Destructor of class VS1053 */ |
kayekss | 0:708868399033 | 31 | VS1053::~VS1053() { |
kayekss | 0:708868399033 | 32 | } |
kayekss | 0:708868399033 | 33 | |
kayekss | 0:708868399033 | 34 | /** Do a hardware reset by hitting VS1053's RESET pin */ |
kayekss | 0:708868399033 | 35 | void VS1053::hardwareReset() { |
kayekss | 0:708868399033 | 36 | rst = 0; |
kayekss | 0:708868399033 | 37 | wait(.05); |
kayekss | 0:708868399033 | 38 | rst = 1; |
kayekss | 0:708868399033 | 39 | wait(.05); |
kayekss | 0:708868399033 | 40 | } |
kayekss | 0:708868399033 | 41 | |
kayekss | 0:708868399033 | 42 | /** Send a byte to VS1053 */ |
kayekss | 0:708868399033 | 43 | void VS1053::sendDataByte(uint8_t b) { |
kayekss | 0:708868399033 | 44 | while (!dreq); |
kayekss | 0:708868399033 | 45 | bsync = 0; |
kayekss | 0:708868399033 | 46 | spi.write(b); |
kayekss | 0:708868399033 | 47 | bsync = 1; |
kayekss | 0:708868399033 | 48 | } |
kayekss | 0:708868399033 | 49 | |
kayekss | 0:708868399033 | 50 | /** Send a data block specified as a pointer to VS1053 */ |
kayekss | 0:708868399033 | 51 | size_t VS1053::sendDataBlock(uint8_t* p, size_t length) { |
kayekss | 0:708868399033 | 52 | size_t sizeSent = 0; |
kayekss | 0:708868399033 | 53 | |
kayekss | 0:708868399033 | 54 | if (!p || !length) return 0; |
kayekss | 0:708868399033 | 55 | while (length) { |
kayekss | 0:708868399033 | 56 | while (!dreq); |
kayekss | 0:708868399033 | 57 | cs = 0; |
kayekss | 0:708868399033 | 58 | for (uint8_t i = 0; i < 32 && length--; i++) { |
kayekss | 0:708868399033 | 59 | spi.write(*p++); |
kayekss | 0:708868399033 | 60 | sizeSent++; |
kayekss | 0:708868399033 | 61 | } |
kayekss | 0:708868399033 | 62 | cs = 1; |
kayekss | 0:708868399033 | 63 | } |
kayekss | 0:708868399033 | 64 | return sizeSent; |
kayekss | 0:708868399033 | 65 | } |
kayekss | 0:708868399033 | 66 | |
kayekss | 0:708868399033 | 67 | /** Change VS1053's PLL setting for speedup */ |
kayekss | 0:708868399033 | 68 | void VS1053::clockUp() { |
kayekss | 0:708868399033 | 69 | // Set CLKI to 43.0-55.3 MHz |
kayekss | 0:708868399033 | 70 | writeReg(SCI_CLOCKF, 0x8800); // SC_MULT=4 (3.5x), SC_ADD=1 (+1.0x) |
kayekss | 0:708868399033 | 71 | } |
kayekss | 0:708868399033 | 72 | |
kayekss | 0:708868399033 | 73 | /** Send cancel request to VS1053 */ |
kayekss | 0:708868399033 | 74 | bool VS1053::sendCancel() { |
kayekss | 0:708868399033 | 75 | uint16_t reg; |
kayekss | 0:708868399033 | 76 | |
kayekss | 0:708868399033 | 77 | // Set SM_CANCEL bit |
kayekss | 0:708868399033 | 78 | reg = readReg(SCI_MODE); |
kayekss | 0:708868399033 | 79 | if (reg & 0x0008) { |
kayekss | 0:708868399033 | 80 | // Abort if SM_CANCEL is still set |
kayekss | 0:708868399033 | 81 | return 0; |
kayekss | 0:708868399033 | 82 | } |
kayekss | 0:708868399033 | 83 | writeReg(SCI_MODE, reg | 0x0008); |
kayekss | 0:708868399033 | 84 | return 1; |
kayekss | 0:708868399033 | 85 | } |
kayekss | 0:708868399033 | 86 | |
kayekss | 0:708868399033 | 87 | /** Stop playing (CALL AFTER sendCancel SUCCESSES) */ |
kayekss | 0:708868399033 | 88 | bool VS1053::stop() { |
kayekss | 0:708868399033 | 89 | uint16_t reg; |
kayekss | 0:708868399033 | 90 | uint8_t endFillByte; |
kayekss | 0:708868399033 | 91 | size_t length; |
kayekss | 0:708868399033 | 92 | |
kayekss | 0:708868399033 | 93 | // If SM_CANCEL is still set, do nothing |
kayekss | 0:708868399033 | 94 | reg = readReg(SCI_MODE); |
kayekss | 0:708868399033 | 95 | if (reg & 0x0008) { |
kayekss | 0:708868399033 | 96 | return 0; |
kayekss | 0:708868399033 | 97 | } |
kayekss | 0:708868399033 | 98 | |
kayekss | 0:708868399033 | 99 | // Read endFillByte from XRAM <1E06h> |
kayekss | 0:708868399033 | 100 | writeReg(SCI_WRAMADDR, 0x1e06); |
kayekss | 0:708868399033 | 101 | reg = readReg(SCI_WRAM); |
kayekss | 0:708868399033 | 102 | |
kayekss | 0:708868399033 | 103 | // Send lower 8 bits of endFillByte 2,052 times |
kayekss | 0:708868399033 | 104 | endFillByte = reg & 0xff; |
kayekss | 0:708868399033 | 105 | length = 2052; |
kayekss | 0:708868399033 | 106 | while (length) { |
kayekss | 0:708868399033 | 107 | while (!dreq); |
kayekss | 0:708868399033 | 108 | cs = 0; |
kayekss | 0:708868399033 | 109 | for (uint8_t i = 0; i < 32 && length--; i++) { |
kayekss | 0:708868399033 | 110 | spi.write(endFillByte); |
kayekss | 0:708868399033 | 111 | } |
kayekss | 0:708868399033 | 112 | cs = 1; |
kayekss | 0:708868399033 | 113 | } |
kayekss | 0:708868399033 | 114 | |
kayekss | 0:708868399033 | 115 | // Check if both HDAT0 and HDAT1 are cleared |
kayekss | 0:708868399033 | 116 | return readReg(SCI_HDAT0) == 0x0000 && readReg(SCI_HDAT1) == 0x0000; |
kayekss | 0:708868399033 | 117 | } |
kayekss | 0:708868399033 | 118 | |
kayekss | 0:708868399033 | 119 | /** Write to an SCI (Serial Control Interface) register entry */ |
kayekss | 0:708868399033 | 120 | void VS1053::writeReg(uint8_t addr, uint16_t word) { |
kayekss | 0:708868399033 | 121 | // If addr is out-of-range, do nothing |
kayekss | 0:708868399033 | 122 | if (addr > 0x0f) { |
kayekss | 0:708868399033 | 123 | return; |
kayekss | 0:708868399033 | 124 | } |
kayekss | 0:708868399033 | 125 | |
kayekss | 0:708868399033 | 126 | while (!dreq); |
kayekss | 0:708868399033 | 127 | cs = 0; |
kayekss | 0:708868399033 | 128 | spi.write(0x02); // Send a "Write SCI" instruction (02h), |
kayekss | 0:708868399033 | 129 | spi.write(addr); // target address, |
kayekss | 0:708868399033 | 130 | spi.write(word >> 8); // high byte, |
kayekss | 0:708868399033 | 131 | spi.write(word & 0xff); // then low byte |
kayekss | 0:708868399033 | 132 | while (!dreq); |
kayekss | 0:708868399033 | 133 | cs = 1; |
kayekss | 0:708868399033 | 134 | } |
kayekss | 0:708868399033 | 135 | |
kayekss | 0:708868399033 | 136 | /** Read an SCI (Serial Control Interface) register entry */ |
kayekss | 0:708868399033 | 137 | uint16_t VS1053::readReg(uint8_t addr) { |
kayekss | 0:708868399033 | 138 | uint16_t word; |
kayekss | 0:708868399033 | 139 | |
kayekss | 0:708868399033 | 140 | // If addr is out-of-range, return a beef |
kayekss | 0:708868399033 | 141 | if (addr > 0x0f) { |
kayekss | 0:708868399033 | 142 | return 0xbeef; |
kayekss | 0:708868399033 | 143 | } |
kayekss | 0:708868399033 | 144 | |
kayekss | 0:708868399033 | 145 | while (!dreq); |
kayekss | 0:708868399033 | 146 | cs = 0; |
kayekss | 0:708868399033 | 147 | spi.write(0x03); // Send a "Read SCI" instruction (03h) |
kayekss | 0:708868399033 | 148 | spi.write(addr); // and target address |
kayekss | 0:708868399033 | 149 | word = spi.write(0xff) << 8; // Receive high byte with dummy data FFh |
kayekss | 0:708868399033 | 150 | word |= spi.write(0xff); // Receive low byte |
kayekss | 0:708868399033 | 151 | while (!dreq); |
kayekss | 0:708868399033 | 152 | cs = 1; |
kayekss | 0:708868399033 | 153 | return word; |
kayekss | 0:708868399033 | 154 | } |