serial: Fix signed overflow warning

1 files changed, 5 insertions, 4 deletions

diff --git a/Venus_Skeleton/comm.ino b/Venus_Skeleton/comm.ino
index d60138e..7f9e422 100644
--- a/Venus_Skeleton/comm.ino
+++ b/Venus_Skeleton/comm.ino
@@ -6,6 +6,7 @@
 #include "definitions.h"
 #include "dataTypes.h"
 #include "comm.h"
+#include <stdint.h>
 
 serial_state_t serial_state = SERIAL_UNKNOWN;
 
@@ -74,9 +75,9 @@ static void serial_write_len(unsigned len) {
 }
 
 // write remainder of data
-static void serial_write_data(const char *data, unsigned len) {
+static void serial_write_data(const uint8_t *data, unsigned len) {
 	for (unsigned i = 0; i < len; i++) {
-		char c = data[i];
+		uint8_t c = data[i];
 		if (c & 0x80) {
 			Serial.write(DATA_ESCAPE);
 			Serial.write(c & ~0x80);
@@ -88,7 +89,7 @@ static void serial_write_data(const char *data, unsigned len) {
 
 void serial_print_debug(const char *str) {
 	unsigned len = strlen(str);
-	const char c = DATA_DEBUG_PREFIX;
+	const uint8_t c = DATA_DEBUG_PREFIX;
 
 	// only write data when the serial connection is ready
 	if (serial_state != SERIAL_READY) {
@@ -101,7 +102,7 @@ void serial_print_debug(const char *str) {
 		// add one for the debug prefix
 		serial_write_len(1 + datalen);
 		serial_write_data(&c, 1);         /* write prefix */
-		serial_write_data(str, datalen);  /* write actual data payload */
+		serial_write_data((uint8_t *)str, datalen);  /* write actual data payload */
 		len -= datalen;
 	}
 }