mirror of
https://github.com/holub/mame
synced 2025-05-31 10:01:51 +03:00
691f915b21
Finished hooking the UPD7759 up to the following drivers: vgmplay Bay Route (encrypted, protected bootleg) E-Swat - Cyber Police (bootleg, set 1) Golden Axe (encrypted bootleg) Passing Shot (2 Players) (bootleg)
73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Angelo Salese
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/* Sega 315-5641 / D77591 / 9442CA010 */
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#include "emu.h"
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#include "315-5641.h"
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DEFINE_DEVICE_TYPE(SEGA_315_5641_PCM, sega_315_5641_pcm_device, "315_5641_pcm", "Sega 315-5641 PCM")
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sega_315_5641_pcm_device::sega_315_5641_pcm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
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: upd7756_device(mconfig, SEGA_315_5641_PCM, tag, owner, clock), m_fifo_read(0), m_fifo_write(0)
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{
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}
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void sega_315_5641_pcm_device::device_start()
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{
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upd7756_device::device_start();
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save_item(NAME(m_fifo_data), 0x40);
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save_item(NAME(m_fifo_read));
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save_item(NAME(m_fifo_write));
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}
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void sega_315_5641_pcm_device::advance_state()
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{
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switch (m_state)
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{
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case STATE_DROP_DRQ:
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if (!m_md)
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{
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// Slave Mode: get data from FIFO buffer
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uint8_t fiforead = (m_fifo_read + 1) & 0x3F;
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if (fiforead != m_fifo_write)
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{
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m_fifo_in = m_fifo_data[fiforead];
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m_fifo_read = fiforead;
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}
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}
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break;
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}
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upd7756_device::advance_state();
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}
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void sega_315_5641_pcm_device::port_w(u8 data)
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{
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if (m_md)
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{
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// update the FIFO value
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m_fifo_in = data;
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}
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else
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{
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m_fifo_data[m_fifo_write++] = data;
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m_fifo_write &= 0x3F;
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}
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}
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uint8_t sega_315_5641_pcm_device::get_fifo_space()
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{
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return (m_fifo_read - m_fifo_write) & 0x3F;
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}
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void sega_315_5641_pcm_device::device_reset()
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{
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upd7756_device::device_reset();
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m_fifo_read = 0x3F;
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m_fifo_write = 0x00;
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}
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