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From: Micko [mailto:mmicko@gmail.com]

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Subject: 8257dma
Hi Aaron,
 
Small changes for 8257.
 
Fixed terminal count stop for autoload mode and added callback function existance check [Miodrag Milanovic]
 
Regards,
Miodrag
This commit is contained in:
Aaron Giles 2008-07-24 03:58:40 +00:00
parent 7c527fd0a7
commit 96a01c9d29
1 changed files with 28 additions and 7 deletions
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35
src/emu/machine/8257dma.c
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@ -91,8 +91,17 @@ static int dma8257_do_operation(running_machine *machine, dma8257_t *dma8257, in
}
switch(mode) {
case 1:
data = dma8257->intf->memory_read(machine, dma8257->address[channel]);
dma8257->intf->channel_write[channel](machine, 0, data);
if (dma8257->intf->memory_read!=NULL) {
data = dma8257->intf->memory_read(machine, dma8257->address[channel]);
} else {
data = 0;
logerror("8257: No memory read function defined.\n");
}
if (dma8257->intf->channel_write[channel]!=NULL) {
dma8257->intf->channel_write[channel](machine, 0, data);
} else {
logerror("8257: No channel write function for channel %d defined.\n",channel);
}
dma8257->address[channel]++;
dma8257->count[channel]--;
@ -100,9 +109,18 @@ static int dma8257_do_operation(running_machine *machine, dma8257_t *dma8257, in
break;
case 2:
data = dma8257->intf->channel_read[channel](machine, 0);
dma8257->intf->memory_write(machine, dma8257->address[channel], data);
if (dma8257->intf->channel_read[channel]!=NULL) {
data = dma8257->intf->channel_read[channel](machine, 0);
} else {
data = 0;
logerror("8257: No channel read function for channel %d defined.\n",channel);
}
if (dma8257->intf->memory_write!=NULL) {
dma8257->intf->memory_write(machine, dma8257->address[channel], data);
} else {
logerror("8257: No memory write function defined.\n");
}
dma8257->address[channel]++;
dma8257->count[channel]--;
done = (dma8257->count[channel] == 0xFFFF);
@ -154,8 +172,11 @@ static TIMER_CALLBACK( dma8257_timerproc )
{
dma8257->drq &= ~(0x01 << channel);
dma8257_update_status(machine, dma8257);
if (DMA_MODE_TCSTOP(dma8257->mode))
dma8257->mode &= ~(0x01 << channel);
if (!(DMA_MODE_AUTOLOAD(dma8257->mode) && channel==2)) {
if (DMA_MODE_TCSTOP(dma8257->mode)) {
dma8257->mode &= ~(0x01 << channel);
}
}
}
}