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-rw-r--r--cores/arduino/Arduino.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h
index 630f0d6..ac775f1 100644
--- a/cores/arduino/Arduino.h
+++ b/cores/arduino/Arduino.h
@@ -120,6 +120,8 @@ typedef uint8_t byte;
void init(void);
void initVariant(void);
+int atexit(void (*func)()) __attribute__((weak));
+
void pinMode(uint8_t, uint8_t);
void digitalWrite(uint8_t, uint8_t);
int digitalRead(uint8_t);