From eb8bdf4df3550d1e3d0ef08cf1ce80108b721fda Mon Sep 17 00:00:00 2001
From: Damien George
Date: Mon, 21 Apr 2014 00:10:04 +0100
Subject: stmhal, SPI and I2C: Improvements to functionality and consistency.

---
 stmhal/bufhelper.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 stmhal/bufhelper.c

(limited to 'stmhal/bufhelper.c')

diff --git a/stmhal/bufhelper.c b/stmhal/bufhelper.c
new file mode 100644
index 000000000..5612a048d
--- /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;
+    }
+}
-- 
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