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-rw-r--r--rf_test/serial.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/rf_test/serial.h b/rf_test/serial.h
index 96fdcab..0f9415b 100644
--- a/rf_test/serial.h
+++ b/rf_test/serial.h
@@ -2,7 +2,7 @@
#define SA_SERIAL_H
void serial_init(void);
-void serial_write(unsigned char data);
+void serial_write(char data);
void serial_write_line(const char *s);
#endif /* SA_SERIAL_H */