+ TWDR = data;
+ TWCR = BV(TWINT) | BV(TWEN);
+ WAIT_READY();
+
+ if (TW_STATUS != TW_MT_DATA_ACK)
+ {
+ LOG_ERR("Data nack[%x]\n", TWSR);
+ i2c->errors |= I2C_DATA_NACK;
+ i2c_hw_stop();
+ }
+
+ if ((i2c->xfer_size == 1) && (I2C_TEST_STOP(i2c->flags) == I2C_STOP))
+ i2c_hw_stop();
+}
+
+static uint8_t i2c_avr_getc(I2c *i2c)
+{
+ uint8_t data_flag = 0;
+ if (i2c->xfer_size == 1)
+ {
+ TWCR = BV(TWINT) | BV(TWEN);
+ data_flag = TW_MR_DATA_NACK;
+ }
+ else
+ {
+ TWCR = BV(TWINT) | BV(TWEN) | BV(TWEA);
+ data_flag = TW_MR_DATA_ACK;
+ }
+
+ WAIT_READY();
+
+ if (TW_STATUS != data_flag)
+ {
+ LOG_ERR("Data nack[%x]\n", TWSR);
+ i2c->errors |= I2C_DATA_NACK;
+ i2c_hw_stop();
+
+ return 0xFF;
+ }
+
+ uint8_t data = TWDR;
+
+ if ((i2c->xfer_size == 1) && (I2C_TEST_STOP(i2c->flags) == I2C_STOP))
+ i2c_hw_stop();
+
+ return data;
+}
+
+
+static const I2cVT i2c_avr_vt =
+{
+ .start = i2c_avr_start,
+ .getc = i2c_avr_getc,
+ .putc = i2c_avr_putc,
+ .write = i2c_genericWrite,
+ .read = i2c_genericRead,
+};
+
+struct I2cHardware i2c_avr_hw[] =
+{
+ { /* I2C0 */
+ },
+};