44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
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#ifndef SERIAL_H
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#define SERIAL_H
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/* These serial port routines use both transmit and receive queues.
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The actual sending/receiving is handled by the serial_interrupt
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functions, which should get called on TXIF or RCIF. */
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#include "config.h"
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#define STQ_BITS 6 /* transmit queue */
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#define SRQ_BITS 6 /* receive queue */
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#define STQ_SIZE (1<<(STQ_BITS))
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#define SRQ_SIZE (1<<(SRQ_BITS))
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#define STQ_MASK (STQ_SIZE-1)
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#define SRQ_MASK (SRQ_SIZE-1)
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extern volatile uint8_t stq[STQ_SIZE], stq_start, stq_len;
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extern volatile bank1 uint8_t srq[SRQ_SIZE], srq_start, srq_len;
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/* Initialize serial port, queues, serial interrupt */
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void serial_init(void);
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/* Call this on (TXIE && TXIF) and (RCIE && RCIF), respectively */
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void serial_interrupt_tx(void);
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void serial_interrupt_rx(void);
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/* Send byte to PC. Blocks iff transmit queue is full. */
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void serial_put(uint8_t x);
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/* Helper functions */
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void serial_put_string(const uint8_t *s);
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void serial_crlf(void);
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void serial_put_hex(uint8_t x);
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void serial_put_hex32(uint32_t x);
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/* Get byte from PC. Blocks iff receive queue is empty. */
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uint8_t serial_get(void);
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/* Returns true if the respective get/put operation would not block */
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#define serial_can_get() (srq_len != 0)
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#define serial_can_put() (!(stq_len & STQ_SIZE))
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#endif
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