1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/avr/i2c_master.h b/drivers/avr/i2c_master.h
index 868680714..3c7731e8d 100755
--- a/drivers/avr/i2c_master.h
+++ b/drivers/avr/i2c_master.h
@@ -8,15 +8,20 @@
 #define I2C_READ 0x01
 #define I2C_WRITE 0x00
 
+typedef i2c_status_t int16_t
+#define I2C_STATUS_TIMEOUT (-1)
+
+#define I2C_NO_TIMEOUT 0
+
 void i2c_init(void);
-uint8_t i2c_start(uint8_t address);
-uint8_t i2c_write(uint8_t data);
-uint8_t i2c_read_ack(void);
-uint8_t i2c_read_nack(void);
+i2c_status_t i2c_start(uint8_t address, uint8_t timeout);
+i2c_status_t i2c_write(uint8_t data, uint8_t timeout);
+i2c_status_t i2c_read_ack(uint8_t timeout);
+i2c_status_t i2c_read_nack(uint8_t timeout);
 uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length);
 uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length);
 uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length);
 uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length);
-uint8_t i2c_stop(void);
+i2c_status_t i2c_stop(uint8_t timeout);
 
 #endif // I2C_MASTER_H