basic ringbuffer implementation

firmware/src_simtrace/ringbuffer.c

@@ -0,0 +1,34 @@
+typedef struct ringbuf {
+    uint8_t buf[BUFLEN];
+    uint8_t *buf_end;
+    uint8_t *reader;
+    uint8_t *writer;
+} ringbuf;
+
+void rbuf_init(ringbuf *rb)
+{
+    rb->buf_end = buf[BUFLEN-1];
+    rb->buf = {0};
+    rb->reader = rb->buf[0];
+    rb->writer = rb->buf[0];
+}
+
+uint8_t rbuf_read(ringbuf *rb)
+{
+    uint8_t val = *(rb->reader);
+    if (rb->reader == rb->buf_end) {
+        rb->reader = rb->buf;
+    } else{
+        rb->reader++;
+    }
+    return val;
+}
+
+void rbuf_write(ringbuf *rb, uint8_t item) {
+    *(rb->writer) = item;
+    if (rb->writer == rb->buf_end) {
+        rb->writer = rb->buf;
+    } else{
+        rb->writer++;
+    }
+}