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// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/****************************************************************************
pce220_ser.c
Sharp PC-E220/PC-G850V Serial I/O
****************************************************************************/
#include "emu.h"
#include "pce220_ser.h"
// SIO configuration
#define SIO_BAUD_RATE 1200
#define SIO_EOT_BYTE 0x1a
#define SIO_DATA_BIT 8 // number of data bit
#define SIO_PARITY 0 // 0=none 1=odd 2=even
#define SIO_STOP_BIT 1 // number of stop bit
//SIO states
enum
{
SIO_WAIT = 0,
SIO_SEND_START,
SIO_SEND_BIT0,
SIO_SEND_BIT1,
SIO_SEND_BIT2,
SIO_SEND_BIT3,
SIO_SEND_BIT4,
SIO_SEND_BIT5,
SIO_SEND_BIT6,
SIO_SEND_BIT7,
SIO_SEND_PARITY,
SIO_SEND_STOP1,
SIO_SEND_STOP2
};
// device type definition
DEFINE_DEVICE_TYPE(PCE220SERIAL, pce220_serial_device, "pce220_serial", "Sharp PC-E220 serial")
//-------------------------------------------------
// pce220_serial_device - constructor
//-------------------------------------------------
pce220_serial_device::pce220_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, PCE220SERIAL, tag, owner, clock)
, device_image_interface(mconfig, *this)
{
}
//-------------------------------------------------
// pce220_serial_device - destructor
//-------------------------------------------------
pce220_serial_device::~pce220_serial_device()
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pce220_serial_device::device_start()
{
m_send_timer = timer_alloc(FUNC(pce220_serial_device::send_tick), this);
m_receive_timer = timer_alloc(FUNC(pce220_serial_device::receive_tick), this);
m_send_timer->reset();
m_receive_timer->reset();
}
//-------------------------------------------------
// device_reset - reset up the device
//-------------------------------------------------
void pce220_serial_device::device_reset()
{
m_state = SIO_WAIT;
m_bytes_count = 0;
m_dout = m_busy = m_xout = 0;
m_din = m_xin = m_ack = 0;
}
//-------------------------------------------------
// timer events
//-------------------------------------------------
TIMER_CALLBACK_MEMBER(pce220_serial_device::send_tick)
{
if (!m_enabled)
{
m_din = m_xin = m_ack = 0;
return;
}
//send data
if (m_bytes_count <= length())
{
switch(m_state)
{
case SIO_WAIT:
m_ack = 1; //data send request
//waits until is ready to receive
if(!m_busy)
return;
break;
case SIO_SEND_START:
//send start bit
m_xin = 1;
break;
case SIO_SEND_BIT0:
case SIO_SEND_BIT1:
case SIO_SEND_BIT2:
case SIO_SEND_BIT3:
case SIO_SEND_BIT4:
case SIO_SEND_BIT5:
case SIO_SEND_BIT6:
case SIO_SEND_BIT7:
m_xin = BIT(~m_current_byte, m_state - SIO_SEND_BIT0);
break;
case SIO_SEND_PARITY:
m_xin = calc_parity(m_current_byte);
break;
case SIO_SEND_STOP1:
case SIO_SEND_STOP2:
//stop bit
m_xin = m_ack = 0;
break;
}
if (m_state == (SIO_SEND_PARITY + SIO_STOP_BIT))
{
//next byte
m_bytes_count++;
popmessage("Send %d/%d bytes\n", m_bytes_count , (uint32_t)length());
m_state = SIO_WAIT;
if (m_bytes_count < length())
fread(&m_current_byte, 1);
else
m_current_byte = SIO_EOT_BYTE;
}
else
{
m_state = get_next_state();
}
}
else
{
m_din = m_xin = m_ack = 0;
}
}
TIMER_CALLBACK_MEMBER(pce220_serial_device::receive_tick)
{
if (!m_enabled)
{
m_din = m_xin = m_ack = 0;
return;
}
//receive data
switch(m_state)
{
case SIO_WAIT:
//wait send request
if(m_busy)
return;
m_ack = 1; //acknowledge
break;
case SIO_SEND_START:
//wait for the start bit
if (!m_xout)
return;
break;
case SIO_SEND_BIT0:
case SIO_SEND_BIT1:
case SIO_SEND_BIT2:
case SIO_SEND_BIT3:
case SIO_SEND_BIT4:
case SIO_SEND_BIT5:
case SIO_SEND_BIT6:
case SIO_SEND_BIT7:
m_current_byte |= ((~m_xout)&1) << (m_state - SIO_SEND_BIT0);
break;
case SIO_SEND_PARITY:
if (m_xout != calc_parity(m_current_byte))
logerror("SIO %s: byte %d has wrong parity!\n", tag(), m_bytes_count);
break;
case SIO_SEND_STOP1:
case SIO_SEND_STOP2:
//receive stop bit
m_ack = 0;
break;
}
if (m_state == (SIO_SEND_PARITY + SIO_STOP_BIT))
{
//next byte
m_bytes_count++;
popmessage("Received %d bytes\n", m_bytes_count);
m_state = SIO_WAIT;
if (m_current_byte != SIO_EOT_BYTE)
fwrite(&m_current_byte, 1);
m_current_byte = 0;
}
else
{
m_state = get_next_state();
}
}
/*-------------------------------------------------
DEVICE_IMAGE_LOAD( pce220_serial )
-------------------------------------------------*/
image_init_result pce220_serial_device::call_load()
{
m_state = SIO_WAIT;
m_bytes_count = 0;
m_send_timer->adjust(attotime::from_hz(SIO_BAUD_RATE), 0, attotime::from_hz(SIO_BAUD_RATE));
//read the first byte
fread(&m_current_byte, 1);
return image_init_result::PASS;
}
/*-------------------------------------------------
DEVICE_IMAGE_CREATE( pce220_serial )
-------------------------------------------------*/
image_init_result pce220_serial_device::call_create(int format_type, util::option_resolution *format_options)
{
m_state = SIO_WAIT;
m_bytes_count = 0;
m_current_byte = 0;
m_receive_timer->adjust(attotime::from_hz(SIO_BAUD_RATE), 0, attotime::from_hz(SIO_BAUD_RATE));
return image_init_result::PASS;
}
/*-------------------------------------------------
DEVICE_IMAGE_UNLOAD( pce220_serial )
-------------------------------------------------*/
void pce220_serial_device::call_unload()
{
m_send_timer->reset();
m_receive_timer->reset();
m_state = SIO_WAIT;
m_bytes_count = 0;
m_current_byte = 0;
}
/*-------------------------------------------------
calculate the byte parity
-------------------------------------------------*/
int pce220_serial_device::calc_parity(uint8_t data)
{
uint8_t count = 0;
while(data != 0)
{
count++;
data &= (data-1);
}
return (count ^ BIT(SIO_PARITY, 1)) & 1;
}
/*-------------------------------------------------
returns the next SIO state basing on the
configuration
-------------------------------------------------*/
int pce220_serial_device::get_next_state()
{
switch(m_state)
{
case SIO_SEND_BIT6:
if (SIO_DATA_BIT == 8)
return SIO_SEND_BIT7;
//fall through
case SIO_SEND_BIT7:
return (SIO_PARITY ? SIO_SEND_PARITY : SIO_SEND_STOP1);
case SIO_SEND_STOP1:
case SIO_SEND_STOP2:
return (SIO_STOP_BIT == 2 ? SIO_SEND_STOP2 : SIO_SEND_STOP1);
default:
return m_state + 1;
}
}
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