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