0000118: Whether repeated start condition are used should be configurable through registry

ID	Project	Category	View Status	Date Submitted	Last Update

0000118	PicoCOM2	NI2C	public	2009-09-11 07:23	2009-09-14 07:17

Reporter	~~Kiepfer~~	Assigned To
Priority	normal	Severity	minor	Reproducibility	have not tried
Status	resolved	Resolution	fixed
Product Version	V1.00
Target Version	V1.06	Fixed in Version	V1.06

Summary	0000118: Whether repeated start condition are used should be configurable through registry
Description	Whether repeated start condition are used should be configurable through registry

Forum Link
Found Driver Version	V1.0
Fixed Driver Version	V1.10

Keller 2009-09-11 08:13 developer ~0000080	I disagree. The whole concept of NI2C bases on the fact that the messages of a single transmission request are handled as an atomic transmisson and are not interruptible. Therefore it must use REPEATED START. Some slaves require combined transmissions, where the master sends some bytes first (e.g. a memory address, a register number or a command byte) and then reads a couple of data bytes. These combined transmissions actually must use REPEATED START, but the sequence can only be done in NI2C with two messages in one transmission request. If single messages with separate STOP and START conditions are needed, the user has to schedule different transmission requests with separate calls to DeviceIoControl().