STM32F4 I2C

nakulrao · ‎2013-01-03

Posted on January 04, 2013 at 07:37

Hi

I am attempting to interface the aptina mt9d111 with the stm3240g-eval board.

To initialize all the cam registers, I have to make use of I2C. As far as I know I2C sends only 8-bit data. But some of the registers are 16-bit wide. How am I supposed to initialize them?

Any help will be really appreciated.

Thanks in advance.

waclawek.jan · ‎2013-01-04

Posted on January 04, 2013 at 09:28

This has nothing to do with STM32, not even with the I2C specification.

You simply transfer 8-bit bytes through I2C; their interpretation is entirely up to the slave. Thus, refer to the chip's documentation to find out how to write it's registers.

JW

nakulrao · ‎2013-01-04

Posted on January 05, 2013 at 04:50

Hi

As far as I know the initial device address that has to be sent can be 7-bits wide. But in my case, the device address is itself 1519. I cant be sending 15 and then 19 as it will be overwritten. So, I am not really sure what to do.

ken239955 · ‎2013-01-05

Posted on January 05, 2013 at 20:33

I agree with what JW is trying to tell you. A vast majority of devices use an 8-bit interface. This does not limit the amount of data that can be transferred. Read the operational manual for that device.

waclawek.jan · ‎2013-01-08

Posted on January 08, 2013 at 13:21

No, it is not. Read the manual carefully.

JW

> But in my case, the device address is itself 1519.