1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/avr/i2c_master.h b/drivers/avr/i2c_master.h
index 0806d76aa..cf93680be 100755
--- a/drivers/avr/i2c_master.h
+++ b/drivers/avr/i2c_master.h
@@ -14,6 +14,9 @@ typedef int16_t i2c_status_t;
 #define I2C_STATUS_ERROR   (-1)
 #define I2C_STATUS_TIMEOUT (-2)
 
+#define I2C_TIMEOUT_IMMEDIATE (0)
+#define I2C_TIMEOUT_INFINITE (0xFFFF)
+
 void i2c_init(void);
 i2c_status_t i2c_start(uint8_t address, uint16_t timeout);
 i2c_status_t i2c_write(uint8_t data, uint16_t timeout);