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// license:BSD-3-Clause
// copyright-holders:Devin Acker
/***************************************************************************
OKI MSM6200 keyboard controller (HLE)
***************************************************************************/
#include "emu.h"
#include "msm6200.h"
DEFINE_DEVICE_TYPE(MSM6200, msm6200_device, "msm6200", "OKI MSM6200 keyboard controller")
/**************************************************************************/
msm6200_device::msm6200_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, MSM6200, tag, owner, clock),
m_keys(*this, "KI%u", 1u),
m_velocity(*this, "VELOCITY"),
m_irq_cb(*this)
{
}
/**************************************************************************/
void msm6200_device::device_start()
{
m_cmd = 0xf;
save_item(NAME(m_cmd));
save_item(NAME(m_row));
save_item(NAME(m_key_data));
save_item(NAME(m_key_state));
save_item(NAME(m_last_state));
}
/**************************************************************************/
void msm6200_device::device_reset()
{
m_row = 0;
m_key_data = 0;
m_key_state = 0;
std::fill(std::begin(m_last_state), std::end(m_last_state), 0);
}
/**************************************************************************/
void msm6200_device::write(offs_t offset, u8 data)
{
// 8-bit multiplexed address/data bus, upper 4 bits are output only
// on write, the lower 4 bits of the address are latched and the data is ignored
m_cmd = offset & 0xf;
m_key_data = 0xff;
switch (m_cmd)
{
case 0: // read key number
for (int i = 0; i < 2; i++)
{
if (BIT(m_key_state ^ m_last_state[m_row], i))
{
m_last_state[m_row] ^= (1 << i);
m_key_data = (BIT(m_key_state, i) << 7) | ((m_row + 1) << 1) | i;
break;
}
}
if (m_key_state == m_last_state[m_row])
m_irq_cb(0);
break;
case 1: // read velocity
m_key_data = m_velocity.read_safe(0x3f);
break;
case 2: // next row?
(++m_row) %= m_keys.size();
// TODO: what should this one actually be?
// the cz1/ht6000 key MCU code outputs the result to port 1 for debugging
m_key_data = m_row;
break;
case 7: // capture current row?
m_key_state = m_keys[m_row].read_safe(0);
if (m_key_state != m_last_state[m_row])
m_irq_cb(1);
break;
case 8: // init all rows
for (int i = 0; i < m_keys.size(); i++)
m_last_state[i] = m_keys[i].read_safe(0);
m_irq_cb(0);
break;
default:
logerror("%s: unknown cmd 0x%x\n", machine().describe_context(), m_cmd);
break;
}
}
/**************************************************************************/
u8 msm6200_device::read()
{
return m_key_data;
}
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