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92c44c572e
So far, we use a uint8_t ring buffer as "FIFO" between USART Rx interrupt and main context. That's fine for expressing the bytes we receive. However, if we also want to report USART errors synchronously in that stream, we actually need more bits to express those. Reporting USART errors via the ring buffer is the only way how the sniffer code can know in which TPDU the error occurred. Reporting them any other way (global variable, ...) would loose the timing relationship where in the received stream the error occurred. This change just changes the ringbuffer from 1024-entry 8bit to 512-entry 16bit and doesn't add any error reporting. Change-Id: Ifde054fbfe7f753b61e7d3409c56eca6e0faeb4b
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* Ring buffer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef SIMTRACE_RINGBUF_H
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#define SIMTRACE_RINGBUF_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#define RING_BUFLEN 1024
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typedef struct ringbuf {
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uint8_t buf[RING_BUFLEN];
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size_t ird;
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size_t iwr;
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} ringbuf;
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void rbuf_reset(volatile ringbuf * rb);
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uint8_t rbuf_read(volatile ringbuf * rb);
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uint8_t rbuf_peek(volatile ringbuf * rb);
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int rbuf_write(volatile ringbuf * rb, uint8_t item);
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bool rbuf_is_empty(volatile ringbuf * rb);
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bool rbuf_is_full(volatile ringbuf * rb);
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/* same as above but with 16bit values instead of 8bit */
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#define RING16_BUFLEN 512
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typedef struct ringbuf16 {
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uint16_t buf[RING16_BUFLEN];
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size_t ird;
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size_t iwr;
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} ringbuf16;
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void rbuf16_reset(volatile ringbuf16 * rb);
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uint16_t rbuf16_read(volatile ringbuf16 * rb);
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uint16_t rbuf16_peek(volatile ringbuf16 * rb);
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int rbuf16_write(volatile ringbuf16 * rb, uint16_t item);
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bool rbuf16_is_empty(volatile ringbuf16 * rb);
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bool rbuf16_is_full(volatile ringbuf16 * rb);
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#endif /* end of include guard: SIMTRACE_RINGBUF_H */
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