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28 lines
685 B
C
28 lines
685 B
C
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#include <stdint.h>
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#include <stdbool.h>
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/* Extremely simplified Zilog SIO */
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typedef struct {
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// Write registers WR7:0
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uint8_t wr[7];
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// Read registers RR2:0
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uint8_t rr[2];
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uint8_t rx;
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uint8_t tx;
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// Set to true when writing a byte while SIO is enabled and set back to
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// false when sio_has_irq() is false.
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bool in_int;
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} SIO;
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void sio_init(SIO *sio);
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bool sio_has_irq(SIO *sio);
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bool sio_hasrx(SIO *sio);
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bool sio_hastx(SIO *sio);
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uint8_t sio_read(SIO *sio);
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void sio_write(SIO *sio, uint8_t val);
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uint8_t sio_actl_rd(SIO *sio);
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void sio_actl_wr(SIO *sio, uint8_t val);
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uint8_t sio_adata_rd(SIO *sio);
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void sio_adata_wr(SIO *sio, uint8_t val);
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