1 files changed, 44 insertions, 0 deletions

diff --git a/quantum/ring_buffer.h b/quantum/ring_buffer.h
new file mode 100644
index 000000000..284745ca8
--- /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; }
+}