How to configure I2C frequency other than 100kHz 250kHz and 400Khz?

RE: How to configure I2C frequency other than 100kHz 250kHz and 400Khz?

Prakash Rajiah — Thu, 23 Jul 2020 15:07:08 GMT

Hi,

Would it possible to know what is the calculation for custom frequencies in TWIM/SPIM ?

RE: How to configure I2C frequency other than 100kHz 250kHz and 400Khz?

pradeep8892 — Wed, 22 Apr 2020 15:23:29 GMT

Hi Evin,

Thank you so much for quick response.

Unfortunately i also do not have logic analyzer.

I'll try the values suggested by you and get back to you,

Thanks & regards

Pradeep

RE: How to configure I2C frequency other than 100kHz 250kHz and 400Khz?

Edvin — Wed, 22 Apr 2020 09:22:07 GMT

Hello,

Do you have a logic analyzer that you can use to measure the actual frequency?

Can you try to set it to 0x00520000UL ?

This is just calculations, rounded off. I don't remember whether it is the last 3 or 4 '0's that doesn't affect the actual frequency, and I don't have a logic analyzer at my home office to test. If you don't have a logic analyzer, you but a device that requires approx 20kHz, then you can test with this value, and see if it works. If that doesn't work, these values are also good candidates:

0x00510000UL

0x00500000UL

Best regards,

Edvin