53 lines
1 KiB
C
53 lines
1 KiB
C
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#include "devices/input.h"
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#include <debug.h>
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#include "devices/intq.h"
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#include "devices/serial.h"
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/* Stores keys from the keyboard and serial port. */
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static struct intq buffer;
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/* Initializes the input buffer. */
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void
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input_init (void)
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{
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intq_init (&buffer);
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}
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/* Adds a key to the input buffer.
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Interrupts must be off and the buffer must not be full. */
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void
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input_putc (uint8_t key)
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{
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ASSERT (intr_get_level () == INTR_OFF);
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ASSERT (!intq_full (&buffer));
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intq_putc (&buffer, key);
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serial_notify ();
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}
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/* Retrieves a key from the input buffer.
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If the buffer is empty, waits for a key to be pressed. */
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uint8_t
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input_getc (void)
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{
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enum intr_level old_level;
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uint8_t key;
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old_level = intr_disable ();
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key = intq_getc (&buffer);
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serial_notify ();
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intr_set_level (old_level);
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return key;
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}
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/* Returns true if the input buffer is full,
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false otherwise.
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Interrupts must be off. */
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bool
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input_full (void)
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{
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ASSERT (intr_get_level () == INTR_OFF);
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return intq_full (&buffer);
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}
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