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182 lines
6.8 KiB
182 lines
6.8 KiB
// Talkie library
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// Copyright 2011 Peter Knight
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// This code is released under GPLv2 license.
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#include "Adafruit_CPlay_Speaker.h"
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#define FS 8000 // Speech engine sample rate
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#define TICKS (FS / 40) // Speech data rate
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#define USEC ((1000000 + (FS / 2)) / FS) // Sample period (microseconds)
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static const int16_t PROGMEM
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tmsK1[] = {0x82C0,0x8380,0x83C0,0x8440,0x84C0,0x8540,0x8600,0x8780,
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0x8880,0x8980,0x8AC0,0x8C00,0x8D40,0x8F00,0x90C0,0x92C0,
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0x9900,0xA140,0xAB80,0xB840,0xC740,0xD8C0,0xEBC0,0x0000,
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0x1440,0x2740,0x38C0,0x47C0,0x5480,0x5EC0,0x6700,0x6D40},
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tmsK2[] = {0xAE00,0xB480,0xBB80,0xC340,0xCB80,0xD440,0xDDC0,0xE780,
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0xF180,0xFBC0,0x0600,0x1040,0x1A40,0x2400,0x2D40,0x3600,
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0x3E40,0x45C0,0x4CC0,0x5300,0x5880,0x5DC0,0x6240,0x6640,
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0x69C0,0x6CC0,0x6F80,0x71C0,0x73C0,0x7580,0x7700,0x7E80};
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static const int8_t PROGMEM
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tmsK3[] = {0x92,0x9F,0xAD,0xBA,0xC8,0xD5,0xE3,0xF0,
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0xFE,0x0B,0x19,0x26,0x34,0x41,0x4F,0x5C},
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tmsK4[] = {0xAE,0xBC,0xCA,0xD8,0xE6,0xF4,0x01,0x0F,
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0x1D,0x2B,0x39,0x47,0x55,0x63,0x71,0x7E},
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tmsK5[] = {0xAE,0xBA,0xC5,0xD1,0xDD,0xE8,0xF4,0xFF,
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0x0B,0x17,0x22,0x2E,0x39,0x45,0x51,0x5C},
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tmsK6[] = {0xC0,0xCB,0xD6,0xE1,0xEC,0xF7,0x03,0x0E,
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0x19,0x24,0x2F,0x3A,0x45,0x50,0x5B,0x66},
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tmsK7[] = {0xB3,0xBF,0xCB,0xD7,0xE3,0xEF,0xFB,0x07,
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0x13,0x1F,0x2B,0x37,0x43,0x4F,0x5A,0x66},
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tmsK8[] = {0xC0,0xD8,0xF0,0x07,0x1F,0x37,0x4F,0x66},
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tmsK9[] = {0xC0,0xD4,0xE8,0xFC,0x10,0x25,0x39,0x4D},
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tmsK10[] = {0xCD,0xDF,0xF1,0x04,0x16,0x20,0x3B,0x4D},
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chirp[] = {0x00,0x2A,0xD4,0x32,0xB2,0x12,0x25,0x14,
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0x02,0xE1,0xC5,0x02,0x5F,0x5A,0x05,0x0F,
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0x26,0xFC,0xA5,0xA5,0xD6,0xDD,0xDC,0xFC,
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0x25,0x2B,0x22,0x21,0x0F,0xFF,0xF8,0xEE,
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0xED,0xEF,0xF7,0xF6,0xFA,0x00,0x03,0x02,0x01};
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static const uint8_t PROGMEM
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tmsEnergy[] = {0x00,0x02,0x03,0x04,0x05,0x07,0x0A,0x0F,
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0x14,0x20,0x29,0x39,0x51,0x72,0xA1,0xFF},
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tmsPeriod[] = {0x00,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
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0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,
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0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,
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0x27,0x28,0x29,0x2A,0x2B,0x2D,0x2F,0x31,
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0x33,0x35,0x36,0x39,0x3B,0x3D,0x3F,0x42,
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0x45,0x47,0x49,0x4D,0x4F,0x51,0x55,0x57,
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0x5C,0x5F,0x63,0x66,0x6A,0x6E,0x73,0x77,
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0x7B,0x80,0x85,0x8A,0x8F,0x95,0x9A,0xA0};
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static const uint8_t *ptrAddr;
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static uint16_t buf;
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static uint8_t bufBits;
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static inline uint8_t rev(uint8_t a) { // Reverse bit sequence in 8-bit value
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a = ( a >> 4) | ( a << 4); // 76543210 -> 32107654
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a = ((a & 0xCC) >> 2) | ((a & 0x33) << 2); // 32107654 -> 10325476
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a = ((a & 0xAA) >> 1) | ((a & 0x55) << 1); // 10325476 -> 01234567
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return a;
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}
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static uint8_t getBits(uint8_t bits) {
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uint8_t value;
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if(bits > bufBits) {
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buf |= rev(pgm_read_byte(ptrAddr)) << (8 - bufBits);
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bufBits += 8;
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ptrAddr++; // Don't post-inc in pgm_read_byte! Is a macro.
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}
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value = buf >> (16 - bits);
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buf <<= bits;
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bufBits -= bits;
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return value;
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}
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#define read8(base, bits) pgm_read_byte(&base[getBits(bits)]);
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#define read16(base, bits) pgm_read_word(&base[getBits(bits)]);
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/**************************************************************************/
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/*!
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@brief speak the data at the passed location
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@param addr pointer to the data
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*/
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/**************************************************************************/
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void Adafruit_CPlay_Speaker::say(const uint8_t *addr) {
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int16_t x0=0, x1=0, x2=0, x3=0, x4=0,
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x5=0, x6=0, x7=0, x8=0, x9=0,
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synthK1, synthK2, u0;
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uint16_t synthEnergy, synthRand = 1;
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int8_t synthK3, synthK4, synthK5, synthK6,
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synthK7, synthK8, synthK9, synthK10;
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uint8_t periodCounter=0, nextPwm = 0x7F, synthPeriod;
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uint8_t iCount = TICKS;
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uint32_t nowTime, prevTime=0;
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if(!started) begin();
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buf = bufBits = 0; // Reset 'ROM' reader (global stuff)
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ptrAddr = addr;
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for(;;) {
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while(((nowTime = micros()) - prevTime) < USEC);
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#ifdef __AVR__
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OCR4A = nextPwm;
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#else
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analogWrite(A0, nextPwm);
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#endif
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prevTime = nowTime;
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if(++iCount >= TICKS) {
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// Read speech data, processing the variable size frames
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uint8_t energy;
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if((energy = getBits(4)) == 0) { // Rest frame
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synthEnergy = 0;
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} else if(energy == 0xF) { // Stop frame; silence
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#ifdef __AVR__
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TCCR4A = 0x7F;
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#else
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analogWrite(A0, 0x7F);
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#endif
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break;
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} else {
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synthEnergy = pgm_read_byte(&tmsEnergy[energy]);
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uint8_t repeat = getBits(1);
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synthPeriod = pgm_read_byte(&tmsPeriod[getBits(6)]);
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if(!repeat) { // A repeat frame uses last coefficients
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synthK1 = read16(tmsK1, 5); // All frames
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synthK2 = read16(tmsK2, 5); // use the first
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synthK3 = read8( tmsK3, 4); // 4 coefficients
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synthK4 = read8( tmsK4, 4);
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if(synthPeriod) {
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synthK5 = read8(tmsK5 , 4); // Voiced
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synthK6 = read8(tmsK6 , 4); // frames
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synthK7 = read8(tmsK7 , 4); // use
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synthK8 = read8(tmsK8 , 3); // six
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synthK9 = read8(tmsK9 , 3); // extra
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synthK10 = read8(tmsK10, 3); // coeffs
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}
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}
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}
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iCount = 0;
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}
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if(synthPeriod) { // Voiced source
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if(++periodCounter >= synthPeriod) periodCounter = 0;
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u0 = (periodCounter >= sizeof(chirp)) ? 0 :
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(pgm_read_byte(&chirp[periodCounter]) *
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(uint32_t)synthEnergy) >> 8;
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} else { // Unvoiced source
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synthRand = (synthRand >> 1) ^ ((synthRand & 1) ? 0xB800 : 0);
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u0 = (synthRand & 1) ? synthEnergy : -synthEnergy;
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}
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u0 -= ((synthK10 * x9) +
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(synthK9 * x8)) >> 7;
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x9 = x8 + ((synthK9 * u0 ) >> 7);
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u0 -= ((synthK8 * x7 ) >> 7);
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x8 = x7 + ((synthK8 * u0 ) >> 7);
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u0 -= ((synthK7 * x6 ) >> 7);
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x7 = x6 + ((synthK7 * u0 ) >> 7);
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u0 -= ((synthK6 * x5 ) >> 7);
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x6 = x5 + ((synthK6 * u0 ) >> 7);
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u0 -= ((synthK5 * x4 ) >> 7);
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x5 = x4 + ((synthK5 * u0 ) >> 7);
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u0 -= ((synthK4 * x3 ) >> 7);
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x4 = x3 + ((synthK4 * u0 ) >> 7);
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u0 -= ((synthK3 * x2 ) >> 7);
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x3 = x2 + ((synthK3 * u0 ) >> 7);
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u0 -= ((synthK2 * (int32_t)x1 ) >> 15);
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x2 = x1 + ((synthK2 * (int32_t)u0 ) >> 15);
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u0 -= ((synthK1 * (int32_t)x0 ) >> 15);
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x1 = x0 + ((synthK1 * (int32_t)u0 ) >> 15);
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if( u0 > 511) u0 = 511; // Output clamp
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else if(u0 < -512) u0 = -512;
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x0 = u0;
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nextPwm = (u0 >> 2) + 0x80;
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}
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}
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