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(MESS) isa_sblaster: fully hooked up MPU-401 input and output for SB16 [R. Belmont]

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R. Belmont 2013-02-02 04:29:30 +00:00
parent ac0df905b5
commit 0768a4db48
2 changed files with 46 additions and 27 deletions
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70
src/mess/machine/isa_sblaster.c
View File

@ -284,7 +284,7 @@ WRITE8_MEMBER( sb_device::dsp_reset_w )
m_tx_busy = false;
m_xmit_read = m_xmit_write = 0;
m_recv_read = m_recv_write = 0;
m_rx_waiting = m_tx_waiting = false;
m_rx_waiting = m_tx_waiting = 0;
//printf("%02x\n",data);
}
@ -298,6 +298,11 @@ READ8_MEMBER( sb_device::dsp_data_r )
if (m_uart_midi)
{
UINT8 rv = m_recvring[m_recv_read++];
if (m_recv_read >= MIDI_RING_SIZE)
{
m_recv_read = 0;
}
if (m_rx_waiting)
{
m_rx_waiting--;
@ -777,17 +782,28 @@ READ8_MEMBER( sb16_device::mpu401_r )
irq_w(0, IRQ_MPU);
if(offset == 0) // data
{
if(m_head != m_tail)
res = m_recvring[m_recv_read++];
if (m_recv_read >= MIDI_RING_SIZE)
{
res = m_mpu_queue[m_tail++];
m_tail %= 16;
m_recv_read = 0;
}
if (m_rx_waiting)
{
m_rx_waiting--;
}
else
res = 0xff;
}
else // status
{
res = ((m_head != m_tail)?0:0x80) | 0x3f; // bit 7 queue empty (DSR), bit 6 DRR (Data Receive Ready?)
res = 0;
if (m_tx_waiting >= MIDI_RING_SIZE)
{
res |= 0x40; // tx full
}
if (m_rx_waiting == 0)
{
res |= 0x80; // rx empty
}
}
return res;
@ -811,15 +827,18 @@ WRITE8_MEMBER( sb16_device::mpu401_w )
{
case 0x3f: // enter MPU-401 UART mode
irq_w(1, IRQ_MPU);
m_head = m_tail = 0;
m_mpu_queue[m_head++] = 0xfe;
m_recv_read = m_recv_write = 0;
m_xmit_read = m_xmit_write = m_tx_waiting = 0;
m_recvring[m_recv_write++] = 0xfe;
m_rx_waiting = 1;
m_mpu_midi = true;
break;
case 0xff: // reset
irq_w(1, IRQ_MPU);
m_head = m_tail = 0;
m_mpu_queue[m_head++] = 0xfe;
m_recv_read = m_recv_write = 0;
m_recvring[m_recv_write++] = 0xfe;
m_rx_waiting = 1;
m_mpu_midi = false;
break;
}
@ -1199,8 +1218,6 @@ void sb16_device::device_start()
m_isa->install_device(subdevice("ymf262"), 0x0220, 0x0223, 0, 0, FUNC(ymf262_r), FUNC(ymf262_w) );
m_isa->install_device(subdevice("ymf262"), 0x0228, 0x0229, 0, 0, FUNC(ymf262_r), FUNC(ymf262_w) );
m_head = 0;
m_tail = 0;
m_timer = timer_alloc(0, NULL);
}
@ -1238,7 +1255,7 @@ void sb_device::device_reset()
m_tx_busy = false;
m_xmit_read = m_xmit_write = 0;
m_recv_read = m_recv_write = 0;
m_rx_waiting = m_tx_waiting = false;
m_rx_waiting = m_tx_waiting = 0;
// MIDI is 31250 baud, 8-N-1
set_rcv_rate(31250);
@ -1544,6 +1561,11 @@ void sb_device::rcv_complete() // Rx completed receiving byte
if (m_uart_midi)
{
m_recvring[m_recv_write++] = data;
if (m_recv_write >= MIDI_RING_SIZE)
{
m_recv_write = 0;
}
if (m_recv_write != m_recv_read)
{
m_rx_waiting++;
@ -1560,29 +1582,29 @@ void sb16_device::rcv_complete() // Rx completed receiving byte
receive_register_extract();
UINT8 data = get_received_char();
// in UART MIDI mode, we set the DMA8 IRQ on receiving a character
if (m_uart_midi)
// for UART or MPU, add character to the receive queue
if (m_uart_midi || m_mpu_midi)
{
m_recvring[m_recv_write++] = data;
if (m_recv_write >= MIDI_RING_SIZE)
{
m_recv_write = 0;
}
if (m_recv_write != m_recv_read)
{
m_rx_waiting++;
}
if (m_uart_irq)
{
irq_w(1, IRQ_DMA8);
}
}
// in MPU MIDI mode, do this instead
if (m_mpu_midi)
{
m_mpu_queue[m_head++] = data;
if (m_head >= 16)
if (m_mpu_midi)
{
m_head = 0;
irq_w(1, IRQ_MPU);
}
irq_w(1, IRQ_MPU);
}
}

3
src/mess/machine/isa_sblaster.h
View File

@ -222,9 +222,6 @@ protected:
void mixer_set();
virtual void rcv_complete(); // Rx completed receiving byte
private:
UINT8 m_mpu_queue[16];
UINT8 m_tail;
UINT8 m_head;
struct sb16_mixer m_mixer;
};