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05cc7f6531
In commit eac1bec428 we start to use the
ringbuffer inside the console printing code. As a result, we must not
use TRACE_*() or printf() from within ringbuffer.c code to avoid
infinite recursion.
Instead, let rbuf_write() return a negative return value in case the
ring buffer overflows. This way, the callers (outside the
console/stdout code) can print an error message themselves.
Change-Id: Ib009f013be119dbad22fa2b7d60ec8dee59baee5
76 lines
1.3 KiB
C
76 lines
1.3 KiB
C
#include "ringbuffer.h"
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#include "trace.h"
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#include "utils.h"
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/* WARNINGI: Since console output is internally using this ringbuffer to implement
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* buffered writes, we cannot use any TRACE_*() or printf() style functions here,
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* as it would create infinite recursion! */
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void rbuf_reset(volatile ringbuf * rb)
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{
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unsigned long state;
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local_irq_save(state);
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rb->ird = 0;
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rb->iwr = 0;
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local_irq_restore(state);
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}
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uint8_t rbuf_read(volatile ringbuf * rb)
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{
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unsigned long state;
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uint8_t val;
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local_irq_save(state);
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val = rb->buf[rb->ird];
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rb->ird = (rb->ird + 1) % RING_BUFLEN;
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local_irq_restore(state);
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return val;
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}
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uint8_t rbuf_peek(volatile ringbuf * rb)
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{
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return rb->buf[rb->ird];
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}
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bool rbuf_is_empty(volatile ringbuf * rb)
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{
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return rb->ird == rb->iwr;
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}
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static bool __rbuf_is_full(volatile ringbuf * rb)
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{
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return rb->ird == (rb->iwr + 1) % RING_BUFLEN;
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}
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bool rbuf_is_full(volatile ringbuf * rb)
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{
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unsigned long state;
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bool rc;
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local_irq_save(state);
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rc = rb->ird == (rb->iwr + 1) % RING_BUFLEN;
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local_irq_restore(state);
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return rc;
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}
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int rbuf_write(volatile ringbuf * rb, uint8_t item)
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{
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unsigned long state;
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local_irq_save(state);
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if (!__rbuf_is_full(rb)) {
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rb->buf[rb->iwr] = item;
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rb->iwr = (rb->iwr + 1) % RING_BUFLEN;
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local_irq_restore(state);
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return 0;
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} else {
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local_irq_restore(state);
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return -1;
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}
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}
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