badrad
- 5th October 2005, 22:06
Has any one ever tried using the PCA9555 (I2C 16 bit Remote I/O Expanders) with the PBP? I had been using the PCF8575, but due to some delivery problems, I had to substitute with PCA9555. Although pin and functionally compatible, there is a small problem with the read command. The device needs a write command then followed by a read command within the same stream.
The read command requires the following format:
Start bit, Address byte (r/w bit set to 0), Register Byte, Start Bit,
Address Byte (r/w bit set to 1), XX, XX, Stop bit.
(XX, XX is the data from the Device).
Any thoughts or experience? Thanks for any help.
The read command requires the following format:
Start bit, Address byte (r/w bit set to 0), Register Byte, Start Bit,
Address Byte (r/w bit set to 1), XX, XX, Stop bit.
(XX, XX is the data from the Device).
Any thoughts or experience? Thanks for any help.