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| author | QMK Bot <[email protected]> | 2021-02-07 23:16:47 +0000 | 
|---|---|---|
| committer | QMK Bot <[email protected]> | 2021-02-07 23:16:47 +0000 | 
| commit | 3a98bd75c88c5cc64aed72b9d2e3a8857d949fed (patch) | |
| tree | 7edcbbfa0c0efd16e456d6012f90833922d3bb3c /quantum/ring_buffer.h | |
| parent | b8031a1613290ada50f4cb746216fcae90d8935d (diff) | |
| parent | 99bffc2a21ebed07fd767ad2a9a7e1aadd491ef3 (diff) | |
| download | qmk_firmware-3a98bd75c88c5cc64aed72b9d2e3a8857d949fed.tar.gz qmk_firmware-3a98bd75c88c5cc64aed72b9d2e3a8857d949fed.zip | |
Merge remote-tracking branch 'origin/master' into develop
Diffstat (limited to 'quantum/ring_buffer.h')
| -rw-r--r-- | quantum/ring_buffer.h | 44 | 
1 files changed, 44 insertions, 0 deletions
| diff --git a/quantum/ring_buffer.h b/quantum/ring_buffer.h new file mode 100644 index 0000000000..284745ca8e --- /dev/null +++ b/quantum/ring_buffer.h @@ -0,0 +1,44 @@ +#pragma once + +#include <util/atomic.h> +#include <stdint.h> +#include <stdbool.h> + +#ifndef RBUF_SIZE +#    define RBUF_SIZE 32 +#endif + +static uint8_t     rbuf[RBUF_SIZE]; +static uint8_t     rbuf_head = 0; +static uint8_t     rbuf_tail = 0; +static inline bool rbuf_enqueue(uint8_t data) { +    bool ret = false; +    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { +        uint8_t next = (rbuf_head + 1) % RBUF_SIZE; +        if (next != rbuf_tail) { +            rbuf[rbuf_head] = data; +            rbuf_head       = next; +            ret             = true; +        } +    } +    return ret; +} +static inline uint8_t rbuf_dequeue(void) { +    uint8_t val = 0; +    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { +        if (rbuf_head != rbuf_tail) { +            val       = rbuf[rbuf_tail]; +            rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; +        } +    } + +    return val; +} +static inline bool rbuf_has_data(void) { +    bool has_data; +    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { has_data = (rbuf_head != rbuf_tail); } +    return has_data; +} +static inline void rbuf_clear(void) { +    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) { rbuf_head = rbuf_tail = 0; } +} | 
