cpu/esp_common: add RINGBUF_TYPE_NOSPLIT to ringbuffer

cpu/esp_common/freertos/ringbuf.c

@@ -28,8 +28,9 @@ typedef struct {
 
 RingbufHandle_t xRingbufferCreate(size_t xBufferSize, RingbufferType_t xBufferType)
 {
-    /* only byte buffer supported for now */
-    assert(xBufferType == RINGBUF_TYPE_BYTEBUF);
+    /* only byte and no split buffers are supported for now */
+    assert((xBufferType == RINGBUF_TYPE_BYTEBUF) ||
+           (xBufferType == RINGBUF_TYPE_NOSPLIT));
 
     /* allocate the space for rbuf_handle_t including the buffer */
     rbuf_handle_t *handle = malloc(xBufferSize + sizeof(uint16_t) + sizeof(ringbuffer_t));

cpu/esp_common/include/freertos/ringbuf.h

@@ -21,6 +21,7 @@
 extern "C" {
 #endif
 
+#define RINGBUF_TYPE_NOSPLIT    0
 #define RINGBUF_TYPE_BYTEBUF    2
 
 typedef unsigned RingbufferType_t;