// license:BSD-3-Clause // copyright-holders:Nicola Salmoria #include "emu.h" #include "audio/cclimber.h" #include "sound/ay8910.h" // macro to convert 4-bit unsigned samples to 16-bit signed samples #define SAMPLE_CONV4(a) (0x1111*((a&0x0f))-0x8000) #define SND_CLOCK 3072000 /* 3.072 MHz */ SAMPLES_START_CB_MEMBER( cclimber_audio_device::sh_start ) { m_sample_buf = std::make_unique(2 * m_samples_region.bytes()); save_pointer(NAME(m_sample_buf), 2 * m_samples_region.bytes()); } //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(CCLIMBER_AUDIO, cclimber_audio_device, "cclimber_audio", "Crazy Climber Sound Board") //------------------------------------------------- // cclimber_audio_device: Constructor //------------------------------------------------- cclimber_audio_device::cclimber_audio_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, CCLIMBER_AUDIO, tag, owner, clock), m_sample_buf(nullptr), m_sample_num(0), m_sample_freq(0), m_sample_volume(0), m_samples(*this, "samples"), m_samples_region(*this, "samples") { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void cclimber_audio_device::device_start() { save_item(NAME(m_sample_num)); save_item(NAME(m_sample_freq)); save_item(NAME(m_sample_volume)); } //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void cclimber_audio_device::device_add_mconfig(machine_config &config) { ay8910_device &aysnd(AY8910(config, "aysnd", SND_CLOCK/2)); aysnd.port_a_write_callback().set(FUNC(cclimber_audio_device::sample_select_w)); aysnd.add_route(ALL_OUTPUTS, ":speaker", 0.5); SAMPLES(config, m_samples); m_samples->set_channels(1); m_samples->set_samples_start_callback(FUNC(cclimber_audio_device::sh_start)); m_samples->add_route(ALL_OUTPUTS, ":speaker", 0.5); } void cclimber_audio_device::sample_select_w(uint8_t data) { m_sample_num = data; } void cclimber_audio_device::sample_rate_w(uint8_t data) { // calculate the sampling frequency m_sample_freq = SND_CLOCK / 4 / (256 - data); } void cclimber_audio_device::sample_volume_w(uint8_t data) { m_sample_volume = data & 0x1f; // range 0-31 } void cclimber_audio_device::sample_trigger(int state) { if (state == 0) return; play_sample(32 * m_sample_num, m_sample_freq, m_sample_volume); } void cclimber_audio_device::sample_trigger_w(uint8_t data) { sample_trigger(data != 0); } void cclimber_audio_device::play_sample(int start,int freq,int volume) { int romlen = m_samples_region.bytes(); // decode the ROM samples int len = 0; while (start + len < romlen && m_samples_region[start+len] != 0x70) { int sample; sample = (m_samples_region[start + len] & 0xf0) >> 4; m_sample_buf[2*len] = SAMPLE_CONV4(sample) * volume / 31; sample = m_samples_region[start + len] & 0x0f; m_sample_buf[2*len + 1] = SAMPLE_CONV4(sample) * volume / 31; len++; } m_samples->start_raw(0, m_sample_buf.get(), 2 * len, freq); }