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author | Drashna Jael're <drashna@live.com> | 2021-06-29 12:23:03 -0700 |
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committer | Drashna Jael're <drashna@live.com> | 2021-06-29 12:24:07 -0700 |
commit | acf2c323e2927f6007b17ded577cf49fd86fec6c (patch) | |
tree | 8334dc5c71e6ab9bf33c76143eac7bb0e60159b0 /quantum/ring_buffer.h | |
parent | ec7a7beeed3046e9144d4c4ce0ef3b2c4f9e4341 (diff) | |
parent | f55e39e8a2246f6f96fd5d4a84a866e2615cde7b (diff) |
Merge upstream QMK Firmware at '0.12.52~1'
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; } +} |