Matrix user forums

Software I2C is working as expected.
With channel 1 or channel 2 I2C does not work & no commands after I2C are executed.
The microcontroller is brought to a halt.

Hi Martin,

Leigh's got one of these device on order so we can investigate for you.

Thanks Ben & Leigh.
When you test the device, can you also test ADC with internal OSC at 64MHz please as it appears to be wandering all over the place.

Thank you.

Hi Martin,
I think I have the I2C fixed now.
Please try the attached updated CAL file. (C:\ProgramData\MatrixTSL\FlowcodeV8\CAL\PIC)
Thanks
Leigh

Hi Martin,
I've just done a quick ADC test with default settings and it looks OK.
Do you want to post an example?
Thanks
Leigh

LeighM wrote:'ve just done a quick ADC test with default settings and it looks OK.

Hi Leigh,
Was that running the chip with internal osc @ 64 MHz?

Just checked and that was running with OSCFRQ = 0x07;
as your previous program, so that will be 48MHz, not 64

Edit: Yes you are correct, it's a mess at 64MHz
Although in the datasheet there is note reference (3) against that setting, cannot find the relevant note though!

Edit 2: Just changed the ADC conversion speed to Fosc/16 and all is well again. (@64MHz)

LeighM wrote:Just checked and that was running with OSCFRQ = 0x07;
Yes I was running osc for I2C at 48MHz.
What to change it to 64MHz when ADC was working.
as your previous program, so that will be 48MHz, not 64

LeighM wrote:Just changed the ADC conversion speed to Fosc/16 and all is well again. (@64MHz)

Brilliant thanks Leigh for your help on both I2C and ADC.
Will do some testing and let you know how I got on.

LeighM wrote:Just checked and that was running with OSCFRQ = 0x07;
as your previous program, so that will be 48MHz, not 64

Yes I was running osc for I2C at 48MHz.
What to change it to 64MHz when ADC was working.

LeighM wrote:Just changed the ADC conversion speed to Fosc/16 and all is well again. (@64MHz)

Brilliant thanks Leigh for your help on both I2C and ADC.
Will do some testing and let you know how I got on.

Hi Leigh,
Tried I2C with:
channel2 (SDA = RD0, SCL = RD1) - Working.
channel1 (SDA = RC0, SCL = RC1) - Not Working.
Software (SDA = RC0, SCL = RC1) - Working.
Using internal osc @ 48MHz

Thanks Martin,
Interesting, I used channel 1 and port C OK, but not pins 0 and 1
One thing I did add in code at start of program was a setting of the port to open drain.
ODCONC = 0xff;
I then forgot to remove it to see if it was really needed.
I'm out of the office at the moment so will investigate further tomorrow.
Leigh

Hi Martin,
Update: It does not require setting of the port to open drain.
But, weirdly, I can get it to work OK on every pin on port C except 0 and 1!
Hmm, does it need further investigation or a read of the silicon errata
I'll be back

I suspect this might be something to do with the secondary oscillator
but haven't got my head round all the relevant datasheet sections yet

I've poked my head into the datasheet but I've not spotted anything useful so far.

Hi Guys,

I experiance the same problem with a PIC16F15356.

Software I2C is working but Ch1 and Ch2 are not.
FC8.1.1.11


Regards,

PS