CAN transmit 8 filters
I have set up the CAN with 8(bit) filters and all works. There is, however, one thing that has stumped me. I can write values into the transmit data registers with a statement storing the it. i.e. 12 3542 ! whatever I store and send with this is seen correctly at the receiving end. The send word is similar to the snipped below but without the 8 data bytes.
Now, if I set up the same statement (with 8 values/registers) as,
12 3542 !
then... noting happens with the registers. The registers do not change when using TEST. I can copy and paste the values into the NMITerm and it works.
Actually, I manually paste 0 values into the registers so I know the data is valid when testing. Any explantion for this? I have also been using a check for TX0E? before storing values and transmitting. It transmit but there are no changes to the data transmit registers..
In contrast the below code does always work.
10 DD0 ! 00 DD1 ! 00 DD2 ! 00 DD3 !
TBYTE1 @ DD4 !
TBYTE2 @ DD5 !
TBYTE3 @ DD6 !
TBYTE4 @ DD7 !
TBYTE5 @ DD8 !
TBYTE6 @ DD9 !
TBYTE7 @ DDA !
TBYTE8 @ DDB !
8 DDC !
Also, what are the proper timing registry setting if I want to increase the clock from 500K to the max 1M?
I have used an 8 byte/4 filter scenario for a while but now I have run into a puzzle with the 8 byte/8 filter....
So, thoughts are welcome...
Last edited by Norse : 03-21-12 at 03:38 PM.
The snippets were copied from different sections. Hex and decimal are used in some sections with the proper command. I am not sure why but I had some odd behaviours which went away after reflashing the pod....
I later had some spurious values showing up om my screen in spite of the print statement being commented out... Full deletion of the command removed that behaviour.
I have 8 filters or channels running right now.
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