STM32 I2C send 0XF0 slave address with 7bit slave address mode

[fatih yavuzy?lmaz]

Posted on April 05, 2018 at 18:09

I want to send F0 slave address with 7 bit slave address mode by I2C.

When I try to send I got ADDR10 error. Because F0 is reserved 10 bit slave address sending value

please let me know there any way to send F0 for slave address with 7bit mode?

thanks

[T J]

Posted on April 05, 2018 at 22:21

F0 is too large to fit in 7 bits,

which chip are to trying to work with ?

I will look it up.

[fatih yavuzy?lmaz]

Posted on April 06, 2018 at 09:28

hi,

I use STM32 NucleoF401RE development board and I want to write and read data to /from RT750 

this chip has 7 bit slave address and 1 bit(first bit) read-write.

Also, this chip has 4 different register group and each register group has different slave address. 

1.group register slave address is 1111000x, 2

.group register slave address is 1111010x,

3

.group register slave address is 1111100x and 4

.group register slave address is 1111110x,

x=read-write bit

if I want to write data to 3. and 4. group register with 7bit mode I can write. Because the slave addres is 11111000(0xF8),

11111100(0xFC) but if I want to write 1. and 2. register group with 7bit mode I cant write. because 

the slave addres is 

11110000(0xF0) and 11110100(0xF4), I have ADDR10 flag error and the comnunication is stoped.

when I use USB to I2C baord I can write and read data from RT750 by my computer. 

[T J]

Posted on April 06, 2018 at 10:01

I cannot find an  RT750  do you have a link ?

[fatih yavuzy?lmaz]

Posted on April 06, 2018 at 10:18

this is speacial chip. you should sign NDA first. I can write and read data with EM78F641  (8 bit ELAN microcontroller)

by my assembler code.  But STM32 is new for me I use first time. I use assembler to write code for microcontroller until now. It is first time I use STM32MX cupe and Keil with C. it is disaster for me. Actually I finished other part of software  and they are ok. I have problem the smallest and last part of software it is I2C.

[Vasile Guta_Ciucur]

Posted on April 07, 2018 at 21:08

If you use HAL, look here

http://stm32f4-discovery.net/2015/07/hal-library-16-i2c-for-stm32fxxx-devices/

 

If you use SPL, look here 

http://stm32f4-discovery.net/2014/05/library-09-i2c-for-stm32f4xx/