mirror of
https://github.com/hsoft/collapseos.git
synced 2024-09-07 05:08:46 +10:00
71 lines
1.2 KiB
C
71 lines
1.2 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "sio.h"
|
|
|
|
void sio_init(SIO *sio)
|
|
{
|
|
memset(sio->wr, 0, sizeof(sio->wr));
|
|
memset(sio->rr, 0, sizeof(sio->rr));
|
|
sio->rx = 0;
|
|
sio->tx = 0;
|
|
sio->in_int = false;
|
|
}
|
|
|
|
bool sio_has_irq(SIO *sio)
|
|
{
|
|
bool res = sio->in_int;
|
|
sio->in_int = false;
|
|
return res;
|
|
}
|
|
|
|
bool sio_hasrx(SIO *sio)
|
|
{
|
|
return sio->rr[0] & 0x01; // Receive Character Available
|
|
}
|
|
|
|
bool sio_hastx(SIO *sio)
|
|
{
|
|
return !(sio->rr[0] & 0x04); // Transmit Buffer Empty
|
|
}
|
|
|
|
uint8_t sio_read(SIO *sio)
|
|
{
|
|
sio->rr[0] |= 0x04; // Transmit Buffer Empty high
|
|
return sio->tx;
|
|
}
|
|
|
|
void sio_write(SIO *sio, uint8_t val)
|
|
{
|
|
sio->rr[0] |= 0x01; // Receive Character Available high
|
|
sio->rx = val;
|
|
sio->in_int = true;
|
|
}
|
|
|
|
uint8_t sio_actl_rd(SIO *sio)
|
|
{
|
|
uint8_t target = sio->wr[0] & 0x3; // PTR
|
|
return sio->rr[target];
|
|
}
|
|
|
|
void sio_actl_wr(SIO *sio, uint8_t val)
|
|
{
|
|
uint8_t target = sio->wr[0] & 0x7; // PTR
|
|
sio->wr[target] = val;
|
|
if (target != 0) {
|
|
sio->wr[0] &= ~0x7;
|
|
}
|
|
}
|
|
|
|
uint8_t sio_adata_rd(SIO *sio)
|
|
{
|
|
sio->rr[0] &= ~0x01; // Receive Character Available low
|
|
return sio->rx;
|
|
}
|
|
|
|
void sio_adata_wr(SIO *sio, uint8_t val)
|
|
{
|
|
sio->tx = val;
|
|
sio->rr[0] &= ~0x04; // Transmit Buffer Empty low
|
|
}
|
|
|