I2CPreamble Properties

This is the 7-bit slave address for the device to access on the I2C bus. The address value must be left justified, with a zero in the least significant bit. The address bits (starting at DeviceAddress bit 7) are the first data transmitted by the FX3 when starting an I2C transaction. A R/W bit (generated by the firmware) follows the seven device address bits to complete the first byte.

This field controls the start condition sent after every byte of preamble data. The device address is the first byte of data, following by up to seven additional bytes in PreAmbleData. For example, setting StartMask to 0x04 will cause a start condition to be generated after sending PreambleData[1], while setting StartMask to 0x08 will cause a start condition to be generated after sending PreambleData[2], and so on. Note, setting a bit in StartMask will cause the corresponding bit in StopMask to be cleared, if it is also set.

This field controls the stop condition sent after every byte of preamble data. The device address is the first byte of data, following by up to seven additional bytes in PreAmbleData. For example, setting StopMask to 0x01 will cause a stop condition to be generated after sending DeviceAddress, while setting StopMask to 0x02 will cause a stop condition to be generated after sending PreambleData[0], and so on. Note, setting a bit in StopMask will cause the corresponding bit in StartMask to be cleared, if it is also set.