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68681 patch to fix dectalk's startup test in MESS [Hans Ostermeyer]

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This commit is contained in:
Jonathan Gevaryahu 2011-02-04 10:42:46 +00:00
parent 10da185c4e
commit 038f1828c4
1 changed files with 22 additions and 22 deletions
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40
src/emu/machine/68681.c
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@ -419,6 +419,26 @@ static TIMER_CALLBACK( tx_timer_callback )
if ((duart68681->duart_config->tx_callback) && ((duart68681->channel[ch].MR2&0xC0) != 0x80))
duart68681->duart_config->tx_callback(device, ch, duart68681->channel[ch].tx_data);
// if local loopback is on, write the transmitted data as if a byte had been received
if ((duart68681->channel[ch].MR2 & 0xC0) == 0x80)
{
if (duart68681->channel[ch].rx_fifo_num >= RX_FIFO_SIZE)
{
LOG(( "68681: FIFO overflow\n" ));
duart68681->channel[ch].SR |= STATUS_OVERRUN_ERROR;
}
else
{
duart68681->channel[ch].rx_fifo[duart68681->channel[ch].rx_fifo_write_ptr++]
= duart68681->channel[ch].tx_data;
if (duart68681->channel[ch].rx_fifo_write_ptr == RX_FIFO_SIZE)
{
duart68681->channel[ch].rx_fifo_write_ptr = 0;
}
duart68681->channel[ch].rx_fifo_num++;
}
}
duart68681->channel[ch].tx_ready = 1;
duart68681->channel[ch].SR |= STATUS_TRANSMITTER_READY;
@ -437,11 +457,8 @@ static void duart68681_write_TX(duart68681_state* duart68681, int ch, UINT8 data
duart68681->channel[ch].tx_data = data;
// tx_ready will stay on in local loopback mode
if ((duart68681->channel[ch].MR2 & 0xc0) != 0x80) {
duart68681->channel[ch].tx_ready = 0;
duart68681->channel[ch].SR &= ~STATUS_TRANSMITTER_READY;
}
if (ch == 0)
duart68681->ISR &= ~INT_TXRDYA;
@ -453,23 +470,6 @@ static void duart68681_write_TX(duart68681_state* duart68681, int ch, UINT8 data
period = attotime::from_hz(duart68681->channel[ch].baud_rate / 10 );
timer_adjust_oneshot(duart68681->channel[ch].tx_timer, period, ch);
// if local loopback is on, write the transmitted data as if a byte had been recieved
if ((duart68681->channel[ch].MR2&0xC0) == 0x80)
{
if ( duart68681->channel[ch].rx_fifo_num >= RX_FIFO_SIZE )
{
LOG(( "68681: FIFO overflow\n" ));
duart68681->channel[ch].SR |= STATUS_OVERRUN_ERROR;
return;
}
duart68681->channel[ch].rx_fifo[duart68681->channel[ch].rx_fifo_write_ptr++] = data;
if ( duart68681->channel[ch].rx_fifo_write_ptr == RX_FIFO_SIZE )
{
duart68681->channel[ch].rx_fifo_write_ptr = 0;
}
duart68681->channel[ch].rx_fifo_num++;
duart68681_update_interrupts(duart68681);
}
};
READ8_DEVICE_HANDLER(duart68681_r)