+ uint8_t data = 0;
+ if (old_api)
+ {
+ for (uint8_t i = 0x80; i != 0; i >>= 1)
+ {
+ SCL_LO;
+ I2C_HALFBIT_DELAY();
+ SCL_HI;
+ if (SDA_IN)
+ data |= i;
+ else
+ data &= ~i;
+
+ I2C_HALFBIT_DELAY();
+ }
+ SCL_LO;
+
+ /* Generate ACK/NACK */
+ if (i2c->xfer_size > 1)
+ SDA_LO;
+ else
+ SDA_HI;
+
+ I2C_HALFBIT_DELAY();
+ SCL_HI;
+ I2C_HALFBIT_DELAY();
+ SCL_LO;
+ SDA_HI;
+ }
+ else
+ {
+ for (uint8_t i = 0x80; i != 0; i >>= 1)
+ {
+ i2c_sclLo(I2C_DEV(i2c));
+ i2c_halfbitDelay(I2C_DEV(i2c));
+ i2c_sclHi(I2C_DEV(i2c));
+ if (i2c_sdaIn(I2C_DEV(i2c)))
+ data |= i;
+ else
+ data &= ~i;
+
+ i2c_halfbitDelay(I2C_DEV(i2c));
+ }
+ i2c_sclLo(I2C_DEV(i2c));
+
+ /* Generate ACK/NACK */
+ if (i2c->xfer_size > 1)
+ i2c_sdaLo(I2C_DEV(i2c));
+ else
+ i2c_sdaHi(I2C_DEV(i2c));
+
+ i2c_halfbitDelay(I2C_DEV(i2c));
+ i2c_sclHi(I2C_DEV(i2c));
+ i2c_halfbitDelay(I2C_DEV(i2c));
+ i2c_sclLo(I2C_DEV(i2c));
+ i2c_sdaHi(I2C_DEV(i2c));
+ }
+
+ /* Generate stop condition (if requested) */
+ if ((i2c->xfer_size == 1) && (i2c->flags & I2C_STOP))
+ i2c_bitbang_stop_1(i2c);
+
+ return data;