diff --git a/include/libopencm3/stm32/f3/i2c.h b/include/libopencm3/stm32/f3/i2c.h
index cec673df..09cc9677 100644
--- a/include/libopencm3/stm32/f3/i2c.h
+++ b/include/libopencm3/stm32/f3/i2c.h
@@ -435,6 +435,8 @@ void i2c_enable_rxdma(uint32_t i2c);
 void i2c_disable_rxdma(uint32_t i2c);
 void i2c_enable_txdma(uint32_t i2c);
 void i2c_disable_txdma(uint32_t i2c);
+void write_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data);
+void read_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data);
 
 END_DECLS
 
diff --git a/lib/stm32/f3/i2c.c b/lib/stm32/f3/i2c.c
index d0c4db1c..c202f8fa 100644
--- a/lib/stm32/f3/i2c.c
+++ b/lib/stm32/f3/i2c.c
@@ -398,5 +398,78 @@ void i2c_disable_txdma(uint32_t i2c)
 	I2C_CR1(i2c) &= ~I2C_CR1_TXDMAEN;
 }
 
+void write_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data) {
+  int wait;
+  int i;
+  while (i2c_busy(i2c) == 1) {}
+  while (i2c_is_start(i2c) == 1) {}
+  /*Setting transfer properties*/
+  i2c_set_bytes_to_transfer(i2c, size+1);
+  i2c_set_7bit_address(i2c, (i2c_addr & 0x7F));
+  i2c_set_write_transfer_dir(i2c);
+  i2c_enable_autoend(i2c);
+  /*start transfer*/
+  i2c_send_start(i2c);
+
+  wait=true;
+  while (wait) {
+      if (i2c_transmit_int_status(i2c)) {
+	wait=false;
+      }
+      while (i2c_nack(i2c)){}
+  }
+  i2c_send_data(i2c, reg);
+  for (i=0; i<size; i++) {
+    wait=true;
+    while (wait) {
+	if (i2c_transmit_int_status(i2c)) {
+	  wait=false;
+	}
+	while (i2c_nack(i2c)){}
+    }
+    i2c_send_data(i2c, data[i]);
+  }
+}
+
+void read_i2c(uint32_t i2c, uint8_t i2c_addr, uint8_t reg, uint8_t size, uint8_t *data)
+{
+  int wait;
+  int i;
+  while (i2c_busy(i2c) == 1) {}
+  while (i2c_is_start(i2c) == 1) {}
+  /*Setting transfer properties*/
+  i2c_set_bytes_to_transfer(i2c, 1);
+  i2c_set_7bit_address(i2c, i2c_addr);
+  i2c_set_write_transfer_dir(i2c);
+  i2c_disable_autoend(i2c);
+  /*start transfer*/
+  i2c_send_start(i2c);
+
+  wait=true;
+  while (wait)
+    {
+      if (i2c_transmit_int_status(i2c)) {
+	wait=false;
+      }
+      while (i2c_nack(i2c)){} /* Some error */
+    }
+  i2c_send_data(i2c, reg);
+
+  while (i2c_is_start(i2c) == 1) {}
+  /*Setting transfer properties*/
+  i2c_set_bytes_to_transfer(i2c, size);
+  i2c_set_7bit_address(i2c, i2c_addr);
+  i2c_set_read_transfer_dir(i2c);
+  i2c_enable_autoend(i2c);
+  /*start transfer*/
+  i2c_send_start(i2c);
+
+  for (i=0; i<size; i++) {
+    while (i2c_received_data(i2c) == 0) {}
+    data[i]=i2c_get_data(i2c);
+  }
+}
+
+
 /**@}*/