1 files changed, 29 insertions, 0 deletions
diff --git a/stmhal/bufhelper.c b/stmhal/bufhelper.c
new file mode 100644
index 0000000000..5612a048dc
--- /dev/null
+++ b/stmhal/bufhelper.c
@@ -0,0 +1,29 @@
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "bufhelper.h"
+
+void pyb_buf_get_for_send(mp_obj_t o, mp_buffer_info_t *bufinfo, uint8_t *tmp_data) {
+    if (MP_OBJ_IS_INT(o)) {
+        tmp_data[0] = mp_obj_get_int(o);
+        bufinfo->buf = tmp_data;
+        bufinfo->len = 1;
+        bufinfo->typecode = 'B';
+    } else {
+        mp_get_buffer_raise(o, bufinfo, MP_BUFFER_READ);
+    }
+}
+
+mp_obj_t pyb_buf_get_for_recv(mp_obj_t o, mp_buffer_info_t *bufinfo) {
+    if (MP_OBJ_IS_INT(o)) {
+        // allocate a new bytearray of given length
+        bufinfo->len = mp_obj_get_int(o);
+        bufinfo->typecode = 'B';
+        return mp_obj_str_builder_start(&mp_type_bytes, bufinfo->len, (byte**)&bufinfo->buf);
+    } else {
+        // get the existing buffer
+        mp_get_buffer_raise(o, bufinfo, MP_BUFFER_WRITE);
+        return MP_OBJ_NULL;
+    }
+}