Squashed 'tmk_core/' changes from b9e0ea0..caca2c0

caca2c0 Add mouse support to ADB
5b0835a Merge commit '1fe4406f374291ab2e86e95a97341fd9c475fcb8'
f2f7556 Remove unneeded tap delays #201
8124195 Fix URL of HID Usage Tables pdf
0bb4679 Fix typo of doc/keycode.txt
b24fa1a Fix handling of consumer usage #199
6ae1a3d Improve anti-ghosting behavior for fast typing
a4c9763 Fix dfu-programmer parameters
b62b3f2 Move ring_buffer.h file
6ec424f Fix debug print
502fb0c Fix ibm4704 protocol with using interrupt

git-subtree-dir: tmk_core
git-subtree-split: caca2c01553394d959550034c817520d575c7fa0

1 files changed, 53 insertions, 0 deletions

diff --git a/ring_buffer.h b/ring_buffer.h
new file mode 100644
index 0000000000..7bdebbcf34
--- /dev/null
+++ b/ring_buffer.h
@@ -0,0 +1,53 @@
+#ifndef RING_BUFFER_H
+#define RING_BUFFER_H
+/*--------------------------------------------------------------------
+ * Ring buffer to store scan codes from keyboard
+ *------------------------------------------------------------------*/
+#define RBUF_SIZE 32
+static uint8_t rbuf[RBUF_SIZE];
+static uint8_t rbuf_head = 0;
+static uint8_t rbuf_tail = 0;
+static inline void rbuf_enqueue(uint8_t data)
+{
+    uint8_t sreg = SREG;
+    cli();
+    uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
+    if (next != rbuf_tail) {
+        rbuf[rbuf_head] = data;
+        rbuf_head = next;
+    } else {
+        print("rbuf: full\n");
+    }
+    SREG = sreg;
+}
+static inline uint8_t rbuf_dequeue(void)
+{
+    uint8_t val = 0;
+
+    uint8_t sreg = SREG;
+    cli();
+    if (rbuf_head != rbuf_tail) {
+        val = rbuf[rbuf_tail];
+        rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+    }
+    SREG = sreg;
+
+    return val;
+}
+static inline bool rbuf_has_data(void)
+{
+    uint8_t sreg = SREG;
+    cli();
+    bool has_data = (rbuf_head != rbuf_tail);
+    SREG = sreg;
+    return has_data;
+}
+static inline void rbuf_clear(void)
+{
+    uint8_t sreg = SREG;
+    cli();
+    rbuf_head = rbuf_tail = 0;
+    SREG = sreg;
+}
+
+#endif  /* RING_BUFFER_H */