topic I2C_MasterTransferNonBlocking() bytes transfer capability in MCX Microcontrollers

I2C_MasterTransferNonBlocking() bytes transfer capability

Deeps_bang — Mon, 22 Jul 2024 10:38:36 GMT

Hi Team,

We are using LPC55s69 controller.

we wanted to know what's the maximum I2C bytes transferred at a time using

status_t I2C_MasterTransferNonBlocking(I2C_Type *base, i2c_master_handle_t *handle, i2c_master_transfer_t *xfer);

Is it 256 bytes or is it capable of transferring more length?

Thanks & Regards,

Deep_bang

Re: I2C_MasterTransferNonBlocking() bytes transfer capability

Pablo_Ramos — Thu, 25 Jul 2024 20:01:17 GMT

Hi @Deeps_bang,
If you check the examples that the SDK provide about I2C we can find that the max length is 256 bytes.

One alternative to send more than 256 bytes can be implementing a start/repeated start. This means divide the frame and add the related address, the first frame Start+address+data(256B), the second frame start+address(orginal address +256)+data(the other register data).

Hope it helps you!

Re: I2C_MasterTransferNonBlocking() bytes transfer capability

Deeps_bang — Fri, 26 Jul 2024 11:51:25 GMT

Hi Pablo,

Thank you for the response.

With mentioned I2C non_blocking API, I could able to transfer the entire data length .

Thanks & Regards,

Deep_Bang