PIC18F25K22 UART ERROR

[chipfryer27]

Hi

Will definitely try if I get in. I'll use the WiKi examples modified for my chips to keep things simple, with of course CS/SS held Low.

Regards

[chipfryer27]

Hi

Not had much luck. I used a PIC16F18877 with internal clock but I'm getting some strange stuff on MOSI.

Can't find my documentation for the transceiver so unsure which pin is which.

I'll update when I get a chance.

Regards

[chipfryer27]

Hi

I was running out of time today so couldn't investigate much but I think it is component related.

The Tx example runs and provides updates via the UART port. On it I see:-

Start
0 (the failed transceiver init)
0 - 0
1 - 0
2 - 0
3 - 0
etc
This is the "count" increasing and being sent out on the SPI (then UART), with the result (0 = fail)

However monitoring the MOSI I don't see anything coming out that resembles what I should be seeing. It was ages ago I last played with these and I can't remember much about them. Anyone used the examples recently?

Regards

[SILVESTROS]

Hi,
Tomorrow I'll get a new pair of NRF24L01 to test the component using NRFTest example for Tx /Rx . I'll use PIC18F25K22 that I have.
In the meantime, maybe Matrix should do a check of NRF24L01 component , or should it first be confirmed that the NRF24L01 not work ?
Maybe to set another post for component error at forum?

Regards

Basil

[chipfryer27]

Hi

I'm hoping to have some free time tomorrow and hope to investigate further. I do need to find out reliable connection details for my module (with antenna) though.

Regards

[chipfryer27]

Hi

Found connection details and for ease I've designed a little breakout board which I hope to make tomorrow to continue testing. I've looked through the source code and will better understand what's happening when I try again.

Regards

[SILVESTROS]

Hi,
I get some new NRF24L01 ,and make some breakouts to connect transceiver to breadboard . I'll make some tests with PIC18F23K22 . i would like to know if NRF24L01 component works..For that I'll use my oscilloscope that can decode SPI data.
Many thanks in advance for your help.

Regards

Basil

[chipfryer27]

Hi

There are NRF24L01 and NRF24L01+ devices out there and it isn't always clear which is which. There appears to be some difference in registers but I haven't yet had time to go through things to see if any difference is significant.

I think the component is for the former.

Regards

[chipfryer27]

Hi

Okay, things going better (they always do if there is the prospect of beer at the end of task).

Got my connections sorted and I can now get a reply from the module. From the documentation I noticed that Data is valid on clock leading edge but my analyser had it on trailing. Obviously this makes a big difference to what is being decoded and once I set this to leading and clock low when inactive I could then get MOSI that I could "understand", by that I mean I could understand what registers were being W/R (or attempted).

I'd halted the flow at strategic points to allow me to focus in on certain commands (monitored on pins). This is initialise.

Initialise.jpg (80.98 KiB) Viewed 1931 times

When the program loops and "counts" I don't get any confirmation on the UART:-

START
1
0 - 0
1 - 0
2 - 0
etc

No time left for today, but at least we know that the example code does communicate with the module

Regards

[chipfryer27]

Hi

Tried the example Rx code (changing target) and I got similar to above on my analyser. Off hand I think the only initialisation difference was flushing respective buffers, but can't say for certain as I was in a rush.

When I next get a chance I'll try and get both talking to each other.

Not certain of this as I haven't explored it very much but the "0" returns in the previous post (e.g. 1 - 0 / 2 - 0 etc) may be due to the register not containing expected values as I am using "+" modules. I may need to configure a register that at present is being left at default.

Regards