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firmware/sniffer: Add + use 16bit ringbuffer

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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
This commit is contained in:
Harald Welte
2022-11-16 10:48:54 +01:00
committed by laforge
parent 4237c99fa2
commit 92c44c572e
3 changed files with 88 additions and 6 deletions
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18
firmware/libcommon/include/ringbuffer.h
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@@ -32,4 +32,22 @@ int rbuf_write(volatile ringbuf * rb, uint8_t item);
bool rbuf_is_empty(volatile ringbuf * rb);
bool rbuf_is_full(volatile ringbuf * rb);
/* same as above but with 16bit values instead of 8bit */
#define RING16_BUFLEN 512
typedef struct ringbuf16 {
uint16_t buf[RING16_BUFLEN];
size_t ird;
size_t iwr;
} ringbuf16;
void rbuf16_reset(volatile ringbuf16 * rb);
uint16_t rbuf16_read(volatile ringbuf16 * rb);
uint16_t rbuf16_peek(volatile ringbuf16 * rb);
int rbuf16_write(volatile ringbuf16 * rb, uint16_t item);
bool rbuf16_is_empty(volatile ringbuf16 * rb);
bool rbuf16_is_full(volatile ringbuf16 * rb);
#endif /* end of include guard: SIMTRACE_RINGBUF_H */