Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-06-30 16:00:01 +03:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity

M2COMM: unified simulation code for all EPROM revisions.

Browse Source
This commit is contained in:
Ariane Fugmann 2016-06-22 23:34:13 +02:00
parent 3663ba7a25
commit e776cdf0e9
2 changed files with 29 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
src/mame/machine/m2comm.cpp
View File

@ -79,6 +79,7 @@ Sega PC BD MODEL2 A-CRX COMMUNICATION 837-11525
EEPROM:
16726.7 Sega Rally Championship
18643.7 ManxTT
18643A.7 ManxTT
@ -230,7 +231,6 @@ void m2comm_device::device_start()
void m2comm_device::device_reset()
{
set_linktype(16726);
m_zfg = 0;
m_cn = 0;
m_fg = 0;
@ -297,8 +297,9 @@ WRITE8_MEMBER(m2comm_device::cn_w)
m_linkid = 0x00;
m_linkalive = 0x00;
m_linkcount = 0x00;
m_linktimer = 0x04; //0x00E8; // 58 fps * 4s
m_linktimer = 0x00E8; // 58 fps * 4s
comm_init();
comm_tick();
}
#endif
@ -323,44 +324,38 @@ void m2comm_device::check_vint_irq()
}
#ifdef __M2COMM_SIMULATION__
void m2comm_device::set_linktype(UINT16 linktype)
void m2comm_device::comm_init()
{
m_linktype = linktype;
// TODO - check EPR-16726 on Daytona USA and Sega Rally Championship
// EPR-18643(A) - these are accessed by VirtuaON and Sega Touring Car Championship
// frameSize - 0xe00
m_shared[0x12] = 0x00;
m_shared[0x13] = 0x0e;
switch (m_linktype)
{
case 16726:
// Daytona USA / Sega Rally Championship
printf("M2COMM: set mode 'EPR-16726 - Daytona USA'\n");
break;
}
// frameOffset - 0x1c0
m_shared[0x14] = 0xc0;
m_shared[0x15] = 0x01;
}
void m2comm_device::comm_tick()
{
switch (m_linktype)
{
case 16726:
// Daytona USA / Sega Rally Championship
comm_tick_16726();
break;
}
}
void m2comm_device::comm_tick_16726()
{
if (m_linkenable == 0x01)
{
int frameTX = 0x2000;
int frameRX = 0x21c0;
int frameSize = 0x01c0 * 8;
m_zfg ^= 1;
int frameSize = m_shared[0x13] << 8 | m_shared[0x12];
int frameOffset = m_shared[0x15] << 8 | m_shared[0x14];
int dataSize = frameSize + 1;
int togo = 0;
int recv = 0;
int idx = 0;
bool isMaster = (m_fg == 0x01);
bool isSlave = (m_fg == 0x00);
// EPR-16726 uses m_fg for Master/Slave
// EPR-18643(A) seems to check m_shared[1], with a fallback to m_fg
bool isMaster = (m_fg == 0x01 || m_shared[1] == 0x01);
bool isSlave = !isMaster && (m_fg == 0x00);
// if link not yet established...
if (m_linkalive == 0x00)
@ -409,6 +404,7 @@ void m2comm_device::comm_tick_16726()
}
else if (isSlave)
{
// increase linkcount
m_buffer[1]++;
// forward message
@ -421,6 +417,7 @@ void m2comm_device::comm_tick_16726()
{
if (isSlave)
{
// fetch linkcount and linkid, then decrease linkid
m_linkcount = m_buffer[1];
m_linkid = m_buffer[2];
m_buffer[2]--;
@ -508,18 +505,17 @@ void m2comm_device::comm_tick_16726()
int recv = m_line_rx.read(m_buffer, dataSize);
while (recv != 0)
{
m_linktimer = 0x00;
// check if complete message
if (recv == dataSize)
{
// check if valid id
int idx = m_buffer[0];
if (idx > 0 && idx <= m_linkcount) {
if (idx >= 0 && idx <= m_linkcount) {
for (int j = 0x00 ; j < frameSize ; j++)
{
m_shared[frameRX + j] = m_buffer[1 + j];
m_shared[0x2000 + frameOffset + j] = m_buffer[1 + j];
}
m_zfg ^= 1;
m_linktimer = 0x00;
}
}
else
@ -542,15 +538,12 @@ void m2comm_device::comm_tick_16726()
m_buffer[0] = m_linkid;
for (int j = 0x00 ; j < frameSize ; j++)
{
m_buffer[1 + j] = m_shared[frameTX + j];
m_buffer[1 + j] = m_shared[0x2000 + j];
}
m_line_tx.write(m_buffer, dataSize);
m_linktimer = 0x01;
}
}
// clear 03
//TODO:m_shared[3] = 0x00;
}
}
#endif

3
src/mame/machine/m2comm.h
View File

@ -77,9 +77,8 @@ private:
UINT16 m_linktype;
void comm_init();
void comm_tick();
void comm_tick_16726();
#endif
};