1 files changed, 8 insertions, 0 deletions
diff --git a/string.c b/string.c
index 8d1cb7a..e3ebfa7 100644
--- a/string.c
+++ b/string.c
@@ -132,3 +132,11 @@ long atol(const char *ptr)
 
     return acc;
 }
+
+uint8_t csum8(uint8_t *buf, uint32_t len)
+{
+	uint32_t s = 0;
+	while (len-- > 0)
+		s += *buf++;
+	return s;
+}