CAN2 no transmit or receive RM48L950 PGE

Griswald Brooks

Other Parts Discussed in Thread: RM48L950, HALCOGEN

Hello,

I have a problem with the CAN2 on the RM48L950 PGE. This is on a board that we are developing. We have CAN1 working (full loopback test successful) but no transmit or receive with CAN2.

I am using HALCoGen v3.01.01 and IAR 6.40. Currently CAN2 is being setup to transmit on MessageBox 1 and receive on MessageBox 2, though switching them makes no difference.

I have verified the electrical connections to be correct and not seen anything coming out of the processor pins with the oscilloscope.

One thing I did notice which has no effect currently when changing is the canInit() from the HALCoGen code has

canREG1->CTL = 0x00000200U
| 0x00000000U
| 0x0000000AU
| 0x000200043U;

And the last number is clearly a 36-bit number being OR'ed into a 32-bit register.

Any ideas of things I should try?

Regards,

Griswald Brooks

over 13 years ago

0 Jean-Marc Mifsud over 13 years ago

TI__Mastermind 22375 points

Griswal,

I will test this problem on CAN2 and will let you know.

Concerning the following code:

canREG1->CTL = 0x00000200U
| 0x00000000U
| 0x0000000AU
| 0x000200043U;

this has no effect. 0x000200043u is same has 0x200043u.

0 Griswald Brooks over 13 years ago in reply to Jean-Marc Mifsud

Intellectual 460 points

Jean-Marc,

But that then puts the 2 in the 0x200043U in the reserved section of the CTL register.

Regards,

Griswald Brooks

0 Jean-Marc Mifsud over 13 years ago in reply to Griswald Brooks

TI__Mastermind 22375 points

Griswald,

I run a test on my board on CAN1 and CAN2, without problem.

Concerning your finding on CTL register, I've filed a bug report.

Can you send me the HalCogen configuration files and main code so I can try to look at your problem?

0 Griswald Brooks over 13 years ago in reply to Jean-Marc Mifsud

Intellectual 460 points

0317.project2_can.zip

Jean-Marc,

Attached is the whole project. The HALCoGen files were created in this location. The commented out section in the while loop of main shows the CAN1 code which works when I test is with my Kvaser demo program, and the uncommented section shows the same code using CAN2, which does not transmit and when I try to transmit to it I get symptoms of what looks like the CAN bus not being connected (ie, auto resend I think), but again, we have checked our continuities and all the wires are electrically connected and no transmissions for CAN2 come out of the RM48 TX pin.

Thank you for your help and the bug report.

Regards,

Griswald Brooks

0 Jean-Marc Mifsud over 13 years ago in reply to Griswald Brooks

TI__Mastermind 22375 points

Griswal,

I was able to use your code and it is fine on my HDK board.

Do you have an RM48 HDK development board. It will be good to run your code on this board.
On the HDK the external oscillator is 16Mhz. The only modification I had to do was to change the PLL setup as following:

Output Div = 2 instead of 1
Multiplier = 110 instead of 120
And of course on the Clock Source tab, change Crystal frequency to 16Mhz.

Please let me know your progress.

0 Griswald Brooks over 13 years ago in reply to Jean-Marc Mifsud

Intellectual 460 points

Jean-Marc,

Thank you. Your software verification allowed us to find the problem (we do not have an HDK). It turned out our design engineer had hooked CAN3 to CAN2 instead of hooking CAN2 to CAN2. Once we reconfigured HALCoGen to use CAN3, "CAN2" loopbacked successfully.

Regards,

Griswald Brooks

0 marlon marlon over 13 years ago

Prodigy 100 points

hi ,i did this communication ever.any directions and sys_main.c are in the examples of HALcogen. you can find it in your software.

may this will help you !

0 marlon marlon over 12 years ago

Prodigy 100 points

if you want to transmit in can1 of messagebox1 and recieve in can2,you need to use messagebox2 of can2.

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CAN2 no transmit or receive RM48L950 PGE