I2c Address Problem

[nitin110051]

Posted on February 06, 2014 at 18:30

Dear Clive

i want to communicate two Board  through is I2c1. sTm32f103zg  MB6722. Stm32f103Rb Discovery boardfor this i Need address Of both the Devices ,can you support me in matter how to found the Address of a device. #stm32 #i2c #stm32 #i2c

[Tesla DeLorean]

Posted on February 06, 2014 at 19:03

I2C really isn't something I'm in to. If you control the code on both devices, you can surely define whatever 7-bit address you want to the slave device, and then use that to initiate the request in the master device?

STM3210E-EVAL (MB672) ?You might want to review some of the samplesSTM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\I2C\There are probably other firmware examples demonstrating MASTER and SLAVE operation

[nitin110051]

Posted on February 07, 2014 at 05:09 Dear Clive, Thank you For this Early Awnser I looked at the example provided in St peripheral Library  ,I saw that LM 75 is addressed From 0x90 (where it came from ?) MB672 Is a Evaluation Board for Stm32F103ZG MCU . Through MB672 i want to communicate with MB913C (evaluation board for Stm 32F103RB ). Problem i am facing How to Determine what's the  address of  device

[Tesla DeLorean]

Posted on February 07, 2014 at 06:12

I saw that LM75 is addressed From 0x90 (where it came from ?)

It's implemented in the silicon of the part, and described in it's data sheet, page 5

http://datasheets.maximintegrated.com/en/ds/LM75.pdf

If you're using one of your STM32 as a SLAVE device YOU get to define the address, and program it into the ''SLAVE ADDRESS REGISTER'' when you configure the I2C interface

[nitin110051]

Posted on February 07, 2014 at 08:39 Dear Clive Thank you For sharing this Details But now i have one question in my mind If am using one stm32 as a slave and another stm32 as master ,to initiate transfer we need to provide address of slave in firmware of master's , for stm32f103zg what is the i2c address

[Tesla DeLorean]

Posted on February 07, 2014 at 15:29

#define MY_SLAVE_ADDRESS (0x30)