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A small fix to the serial receiver FIFO - fixes error 1101 on IBM PS/2 Models 70 and 80.

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This commit is contained in:
OBattler
2023-02-16 00:15:04 +01:00
parent d5291233f7
commit 3d480a6ffc
1 changed files with 8 additions and 14 deletions
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22
src/device/serial.c
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@@ -153,9 +153,6 @@ static void
serial_receive_timer(void *priv)
{
serial_t *dev = (serial_t *) priv;
#if 0
uint16_t old_out_new = dev->out_new;
#endif
// serial_log("serial_receive_timer()\n");
@@ -179,8 +176,9 @@ serial_receive_timer(void *priv)
dev->rcvr_fifo[dev->rcvr_fifo_end] = (uint8_t) (dev->out_new & 0xff);
dev->rcvr_fifo_end = (dev->rcvr_fifo_end + 1) & 0x0f;
serial_log("To FIFO: %02X (%i)\n", (uint8_t) (dev->out_new & 0xff),
abs(dev->rcvr_fifo_end - dev->rcvr_fifo_pos));
serial_log("To FIFO: %02X (%i, %i, %i)\n", (uint8_t) (dev->out_new & 0xff),
abs(dev->rcvr_fifo_end - dev->rcvr_fifo_pos),
dev->rcvr_fifo_end, dev->rcvr_fifo_pos);
dev->out_new = 0xffff;
if (abs(dev->rcvr_fifo_end - dev->rcvr_fifo_pos) >= dev->rcvr_fifo_len) {
@@ -191,19 +189,15 @@ serial_receive_timer(void *priv)
serial_update_ints(dev);
}
if (dev->rcvr_fifo_end == dev->rcvr_fifo_pos)
dev->rcvr_fifo_full = 1;
timer_on_auto(&dev->timeout_timer, 4.0 * dev->bits * dev->transmit_period);
}
}
}
serial_update_ints(dev);
#if 0
serial_log("FIFO: %i, out_new = %04X, old_out_new = %04X, was_enabled = %i, condition = %i\n",
((dev->type >= SERIAL_16550) && dev->fifo_enabled), dev->out_new,
old_out_new, was_enabled,
((dev->type >= SERIAL_16550) && dev->fifo_enabled) ? (dev->rcvr_fifo_pos != dev->rcvr_fifo_end) : 0);
#endif
}
static void
@@ -622,7 +616,7 @@ serial_write(uint16_t addr, uint8_t val, void *p)
serial_update_ints(dev);
break;
case 6:
dev->msr = (val & 0xF0) | (dev->msr & 0x0F);
dev->msr = (val & 0xf0) | (dev->msr & 0x0f);
if (dev->msr & 0x0f)
dev->int_status |= SERIAL_INT_MSR;
serial_update_ints(dev);
@@ -655,7 +649,7 @@ serial_read(uint16_t addr, void *p)
if ((dev->type >= SERIAL_16550) && dev->fifo_enabled) {
/* FIFO mode. */
if (dev->rcvr_fifo_pos != dev->rcvr_fifo_end) {
if (dev->lsr & 0x01) {
/* There is data in the FIFO. */
ret = dev->rcvr_fifo[dev->rcvr_fifo_pos];
dev->rcvr_fifo_pos = (dev->rcvr_fifo_pos + 1) & 0x0f;