I2C implementation in Nrf NCS SDK 1.7.1

RE: I2C implementation in Nrf NCS SDK 1.7.1

Priyanka — Thu, 17 Mar 2022 08:03:45 GMT

Hi Hitesh,

This is mentioned in the initial portion of the Guide.

"no Zephyr I2C/TWIS Slave Driver supports Nordic I2C/TWI Slave hardware to date. As a result, the TWIM software will use the Zephyr i2c driver, and the TWIS software will use the nRFX driver (NRFX_DRV) paradigm"

Regards,

Priyanka

RE: I2C implementation in Nrf NCS SDK 1.7.1

hiteshk014 — Mon, 14 Mar 2022 14:30:06 GMT

Hi Priyanka,

I want to know more detail about slave implementation in the mentioned demonstration,

in this Guide why are we using nRFx TWIS Driver, master is done using zephyr api's but slave is implemented using nrfx ?

Can we have any slave device demonstration which doesn't uses nRFx TWIS driver.

Thank you

Regards,

RE: I2C implementation in Nrf NCS SDK 1.7.1

Priyanka — Wed, 26 Jan 2022 10:42:31 GMT

Hi Hitesh,

[quote user="hiteshk0104"]1. Changing clock frequency[/quote]

Yes, in order to change the clock frequencies, it's sufficient to pass the speed configurations as mentioned in the documentation.

[quote user="hiteshk0104"]2. I want to have multiple slave configuration and single master in I2C[/quote]

Your overlay file seems good. You can connect up to 127 slaves on a single I2C/TWI bus. You can refer to this GitHub page.

[quote user="hiteshk0104"]3. I want to transfer 16 bit data through i2c bus I am referring to following api i2c_write[/quote]

I don't think this is possible since the i2c_write() expects a uint8_t pointer .

Regards,

Priyanka

RE: I2C implementation in Nrf NCS SDK 1.7.1

hiteshk014 — Mon, 24 Jan 2022 23:48:18 GMT

Hi Priyanka,

This tutorial helped significantly, thank you very much for helping,

We want to know 3 things about data transfer and configuration in i2c.

1. Changing clock frequency

if we need to change clock frequency is it sufficient to pass respective speed configurations in configure as shown below, or can you please share inputs for changing clock frequency in I2C?

i2c_configure(m_i2c_dev, I2C_SPEED_SET(I2C_SPEED_FAST) | I2C_MODE_MASTER);

2. I want to have multiple slave configuration and single master in I2C, I am attaching overlay file of master having multiple slave configurations & slave overlay which will be common across all the slave device, created as per my understanding, please provide your inputs what all configurations are needed for having multiple slave configuration. I am using very same slave example mentioned here in this Guide

3. I want to transfer 16 bit data through i2c bus I am referring to following api i2c_write

int i2c_write(const struct device *dev, const uint8_t *buf, uint32_t num_bytes, uint16_t addr)

if we see buf Memory pool from which the data is transferred it is uint8_t, I want to know common practice nordic recommendation to transfer 16 bit data and a values having signed int.

Thank you,

devzone.nordicsemi.com/.../bl653_5F00_dvk-_2800_Master_2900_.overlay devzone.nordicsemi.com/.../bl653_5F00_dvk-_2800_Slave_2900_.overlay

RE: I2C implementation in Nrf NCS SDK 1.7.1

Priyanka — Mon, 10 Jan 2022 15:42:21 GMT

Hi Hitesh,

We have this Guide which can help you.

Regards,

Priyanka

RE: I2C implementation in Nrf NCS SDK 1.7.1

hiteshk014 — Mon, 10 Jan 2022 11:49:31 GMT

Thank you Priyanka for quick response,

One question on how do we configure master / slave in I2C can you have a basic description ?

RE: I2C implementation in Nrf NCS SDK 1.7.1

Priyanka — Mon, 10 Jan 2022 11:45:55 GMT

Hi Hitesh,

We do not have much examples for the I2C in the nRF Connect SDK. However, one of our colleague has developed this sample which might be of help.

Regards,

Priyanka

RE: I2C implementation in Nrf NCS SDK 1.7.1

hiteshk014 — Mon, 10 Jan 2022 09:06:00 GMT

Hi Priyanka,

I need a sample example of Master-slave I2C protocol,

can you please share some input,

didn't get from above example

Thanks

RE: I2C implementation in Nrf NCS SDK 1.7.1

Priyanka — Thu, 16 Dec 2021 10:37:50 GMT

Hi Hitesh,

We are on low staffing since it's the holiday month. Sorry for the delayed response.

This thread could help you for the issue.

Regards,

Priyanka