Flowcode Support Board

Hi

Trying to Communicate between an STM32F411 ( i2C Master ) and a PIC12F1840 i2C Slave .

I2C has 3 working Devices when I add the PIC18F1840 Slave and try to Scan for devices
it Replies with an ACK and then it shorts the SCK to GND and nothing works after that .

In my PIC Program I only INIT I2c and Put the MCU in a loop .
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.
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I know this is for pic acting as slave - but see viewtopic.php?f=6&t=2598 - where we hit the same issue with connecting two AVR MCUs.
We got around by using the twi interrupt - and the pic maybe has something similar..

Martin

Also don't forget the pull up resistors!

Hi pullup resistors where 10K and changed ro 4.7K
But Same problem

mnfisher wrote: ↑

Mon Jun 17, 2024 7:35 pm

I know this is for pic acting as slave - but see viewtopic.php?f=6&t=2598 - where we hit the same issue with connecting two AVR MCUs.
We got around by using the twi interrupt - and the pic maybe has something similar..

Martin

A Two wire interrupt , I think would be a custom interrupt , I am using i2c Channel 1 but I don't know how that would
work .

Hi

Is this bug fixable or better look for an Alternative ?

Hi,

This Component Also does not work on Atmeg328P

Has someone ever seen this Component working?
Is there any plan to fix this Component any time soon?

The AVR example referenced above does work.

The slave needs to be interrupt driven to stand a chance.

Martin

Hi

Following on from Martin above, I was messing with I2C slave a while back and can't remember offhand when / why, but I do recall that I used the SSP interrupt on a PIC (not every PIC has this feature). Can't really remember much more, or if I actually succeeded in doing what I wanted, but I do know that I had to use the SSP.

Regards

Hi

If you go to the "old" forum and search for I2C SSP you should find some information. Incidentally the old forum is a great source of help.

https://www.flowcode.co.uk/mmforums/sea ... ds=i2c+ssp

Regards