Minimize contract, add ADC read and send its data to coonsole

esp32/main/ringbuf.cpp

@@ -0,0 +1,21 @@
+#include "ringbuf.h"
+
+void ringbuf_init(ringbuf_t *rb) {
+    rb->head = 0;
+    for (int i = 0; i < RINGBUF_SIZE; i++) {
+        rb->values[i] = 0;
+    }
+}
+
+void ringbuf_push(ringbuf_t *rb, int v) {
+    rb->values[rb->head] = v;
+    rb->head = (rb->head + 1) % RINGBUF_SIZE;
+}
+
+void ringbuf_copy(const ringbuf_t *rb, int *out) {
+    int idx = rb->head;
+
+    for (int i = 0; i < RINGBUF_SIZE; i++) {
+        out[i] = rb->values[(idx + i) % RINGBUF_SIZE];
+    }
+}