AT24C512 + BMI160 + NRF52

[Sunil vignesh]

Hi,

I am using nRF52832 soc to develop my project. with nRF5_SDK_15.3 . SES file

I need to connect both BMI160 accelerometer sensor and AT24C512 EEPROM ic in TWI.

how to use TWI with this. guide me to use both at a time.

BMI160 separately i can read the data.

but i can't read while connect to AT24C512

[Øyvind]

Hello, 

The nRF5 SDK includes several examples of how to use the TWI peripheral. 

examples\peripheral\twi_master_using_nrf_twi_mngr

examples\peripheral\twi_master_with_twis_slave

examples\peripheral\twi_scanner

examples\peripheral\twi_sensor

A good place to start is with the TWI Scanner to ensure you can find the devices on the bus. 

Kind regards,
Øyvind

[Sunil vignesh]

Hi,

Thank you for your reply.,

i have used the twi scanner, and sensor.

if i going to use one sensor and one EEPROM.

which one i need to act as slave and master.

how to mange the two communications

[Øyvind]

Hi, 

I recommend reading the TWIM chapter and the TWIS chapter in the product specification for nRF52832.

The master device (TWIM) is in your case the nRF58832, while sensor and EEPROM are slaves. 

If your nRF52832 will work as a slave (TWIS), then you need another microcontroller functioning as a master.

You will find a suitable example to communicate with two devices in the TWI Transaction Manager Example which I linked to yesterday.

Kind regards,
Øyvind

[awneil]

Sunil vignesh said:

which one i need to act as slave and master

Neither - they would both be slaves!

The nRF52832 would be the master - as Øyvind explains.

It sounds like you need to do some study on the basics of I2C.

It is a very well-established and widely-used standard - so there is plenty of material available; eg,

https://www.nxp.com/docs/en/user-guide/UM10204.pdf

https://en.wikipedia.org/wiki/I%C2%B2C

https://i2c.info/

https://learn.sparkfun.com/tutorials/i2c/all

[awneil]

Øyvind said:

I recommend reading the TWIM chapter and the TWIS chapter in the product specification for nRF52832

+1

But could you clarify the distinction between those and the "TWI — I²C compatible two-wire interface" - also in the product specification for nRF52832?

I find it unclear whether it is a separate module, or if TWIM and/or TWIS are just "operating modes" of the TWI module?

Or TWI is an "operating mode" of the TWIM module?

Or what??

The block diagram is not helpful as it shows no "TWI" module.

EDIT

and are there two TWIS modules plus two TWIM modules - or is it just a total of two modules, each of which can be either TWIM or TWIS ?

EDIT 2

The block diagram clearly suggests that there two TWIS modules plus two TWIM modules:

but the 'Key Features' at the start of the Product Specification says:

• Up to 2x I2C compatible 2-wire master/slave

So it looks like the block diagram is misleading?