// license:BSD-3-Clause // copyright-holders:Juergen Buchmueller #include "emu.h" #include "tms3615.h" #define VMIN 0x0000 #define VMAX 0x7fff static const int divisor[TMS3615_TONES] = { 478, 451, 426, 402, 379, 358, 338, 319, 301, 284, 268, 253, 239 }; // device type definition const device_type TMS3615 = &device_creator; //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // tms3615_device - constructor //------------------------------------------------- tms3615_device::tms3615_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, TMS3615, "TMS3615", tag, owner, clock, "tms3615", __FILE__), device_sound_interface(mconfig, *this), m_channel(0), m_samplerate(0), m_basefreq(0), m_output8(0), m_output16(0), m_enable(0) { memset(m_counter8, 0, TMS3615_TONES); memset(m_counter16, 0, TMS3615_TONES); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void tms3615_device::device_start() { m_channel = stream_alloc(0, 2, clock()/8); m_samplerate = clock()/8; m_basefreq = clock(); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void tms3615_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { int samplerate = m_samplerate; stream_sample_t *buffer8 = outputs[TMS3615_FOOTAGE_8]; stream_sample_t *buffer16 = outputs[TMS3615_FOOTAGE_16]; while( samples-- > 0 ) { int sum8 = 0, sum16 = 0, tone = 0; for (tone = 0; tone < TMS3615_TONES; tone++) { // 8' m_counter8[tone] -= (m_basefreq / divisor[tone]); while( m_counter8[tone] <= 0 ) { m_counter8[tone] += samplerate; m_output8 ^= 1 << tone; } if (m_output8 & m_enable & (1 << tone)) { sum8 += VMAX; } // 16' m_counter16[tone] -= (m_basefreq / divisor[tone] / 2); while( m_counter16[tone] <= 0 ) { m_counter16[tone] += samplerate; m_output16 ^= 1 << tone; } if (m_output16 & m_enable & (1 << tone)) { sum16 += VMAX; } } *buffer8++ = sum8 / TMS3615_TONES; *buffer16++ = sum16 / TMS3615_TONES; } m_enable = 0; } void tms3615_device::enable_w(int enable) { m_enable = enable; }