Can I transfer 8208 bytes on I2C with nrf52832 with EasyDMA

RE: Can I transfer 8208 bytes on I2C with nrf52832 with EasyDMA

JONATHAN LL — Fri, 30 Apr 2021 12:19:58 GMT

Look at this case https://devzone.nordicsemi.com/f/nordic-q-a/74224/unable-to-write-8210-bytes-on-i2c-bus and this Stream data over TWI with start signal only in the beginning of the frame, and one stop at the end of the frame - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com).

it might be possible to achieve that using nrfx_twi driver you can send as long packages as you want(up to 2^32-1).

Regards,
Jonathan

RE: Can I transfer 8208 bytes on I2C with nrf52832 with EasyDMA

kamal — Thu, 29 Apr 2021 16:05:47 GMT

Hello Jonathan

thank you for your reply

I need to update a firmware, that chip does not allow repeated start bits between the bytes, all 8208 bytes must be transmitted in one I2C packet, is it possible with nrf52832.

thanks

Kamal

RE: Can I transfer 8208 bytes on I2C with nrf52832 with EasyDMA

JONATHAN LL — Thu, 22 Apr 2021 12:40:39 GMT

Hi Kamal,

[quote user=""]Can I transfer 8208 bytes on I2C with nrf52832 with EasyDMA, ignoring the MAXCNT limit of 8 bit, in one transmission without repeated Starts[/quote]

No.

It could be done without esayDMA, by sending multiple 255 byte packages with no_stop=true, but with repeated start.

Regards,
Jonathan