mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-30 19:58:05 +11:00
28 lines
685 B
C
28 lines
685 B
C
|
#include <stdint.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
|
||
|
|
/* Extremely simplified Zilog SIO */
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
// Write registers WR7:0
|
||
|
|
uint8_t wr[7];
|
||
|
|
// Read registers RR2:0
|
||
|
|
uint8_t rr[2];
|
||
|
|
uint8_t rx;
|
||
|
|
uint8_t tx;
|
||
|
|
// Set to true when writing a byte while SIO is enabled and set back to
|
||
|
|
// false when sio_has_irq() is false.
|
||
|
|
bool in_int;
|
||
|
|
} SIO;
|
||
|
|
|
||
|
|
void sio_init(SIO *sio);
|
||
|
|
bool sio_has_irq(SIO *sio);
|
||
|
|
bool sio_hasrx(SIO *sio);
|
||
|
|
bool sio_hastx(SIO *sio);
|
||
|
|
uint8_t sio_read(SIO *sio);
|
||
|
|
void sio_write(SIO *sio, uint8_t val);
|
||
|
|
uint8_t sio_actl_rd(SIO *sio);
|
||
|
|
void sio_actl_wr(SIO *sio, uint8_t val);
|
||
|
|
uint8_t sio_adata_rd(SIO *sio);
|
||
|
|
void sio_adata_wr(SIO *sio, uint8_t val);
|