Communication between TWIM and TWIS with clock stretching

RE: Communication between TWIM and TWIS with clock stretching

Edvin — Tue, 15 Mar 2022 14:37:32 GMT

[quote user="loquat"]Do short / or long pulses affect TWIS?[/quote]

That depends on the TWI slave, and how they interpret the signals. I don't think it should be an issue when the nRF Is used as the TWIS.

RE: Communication between TWIM and TWIS with clock stretching

loquat — Tue, 15 Mar 2022 08:25:51 GMT

Written on Errata 149:
The slave may give an error condition due to a too long or too short clock pulse or the pulse may be lost.
400 kHz
• Minimum: 0.7 μs
• Maximum: 3.0 μs
100 kHz
• Minimum: 0.7 μs
• Maximum: 11.0 μ

Do short / or long pulses affect TWIS?

(As far as I've tested, I haven't had any issues.)

RE: Communication between TWIM and TWIS with clock stretching

Edvin — Tue, 15 Mar 2022 07:59:18 GMT

Ah, I see. So you will use the nRF on both sides.

I think this will work when you have the nRF52832 as the TWIS as well. Have you tested this?

BR,

Edvin

RE: Communication between TWIM and TWIS with clock stretching

loquat — Mon, 14 Mar 2022 23:12:59 GMT

it's not.

Will clock-stretch affect me when I connect TWIM to TWIS on another device?

RE: Communication between TWIM and TWIS with clock stretching

Edvin — Mon, 14 Mar 2022 14:53:52 GMT

Hello,

That errata is related to the TWIM generating this clock pulse after the slave has used clock stretching. So this errata should not affect you when you are running as a TWI slave.

Best regards,

Edvin