F28M35H52C: CAN communication failure

Eric QI

Intellectual 620 points

Part Number: F28M35H52C

Hi,

Configure gpiopinConfigure (GPIO_PE0_CAN0RX)

GPIOPinConfigure (GPIO_PE1_CAN0RX)

GPIOPinTypeCAN (GPIO_PORTE_BASE, GPIO0 | GPIO1) register display as shown in the above CAN normal communication link

Change it to gpiopinConfigure (GPIO_PE6_CAN0RX)

GPIOPinConfigure (GPIO_PE7_CAN0RX)

GPIOPinTypeCAN (GPIO_PORTE_BASE, GPIO6 | GPIO7)

The register is shown below. CAN communication cannot be connected after modification.

Please indicate which configuration needs to be changed after modifying the pin configuration. Thank you very much

over 4 years ago

0 Hareesh Janakiraman over 4 years ago

TI__Guru* 95315 points

Eric,

I regret I don’t understand what exactly your problem is.

GPIOPinConfigure (GPIO_PE1_CAN0RX)

GPIO_PE1 is CAN0TX, not CAN0RX.

GPIOPinConfigure (GPIO_PE7_CAN0RX)

GPIO_PE7 is CAN0TX, not CAN0RX.

Please download my Application report http://www.ti.com/lit/sprace5. I strongly urge you to look at the Debug tips provided. Most CAN issues can be resolved by going through this checklist.

0 Eric QI over 4 years ago in reply to Hareesh Janakiraman

Intellectual 620 points

Thanks,Hareesh

on the basis of the original CAN communication, the CAN communication cannot be connected

after the RX/TX pin is modified from PE0/PE1 to PE6/PE7 in the hardware.

The software configuration also changes the pin configuration in the initialization.

Do the hardware and software need to make other corresponding modifications?

Why CAN communication can not to be connected?

0 Hareesh Janakiraman over 4 years ago in reply to Eric QI

TI__Guru* 95315 points

Eric,

I regret I still don’t understand what your problem is and exactly where you are stuck. http://www.ti.com/lit/sprace5 gives you clear debugging tips. Without access to your hardware, I can only provide suggestions on where to look. Application report http://www.ti.com/lit/spracq3 depicts lot of easy to understand waveforms. This shows you what to expect from the CANTX pin.

The TRM chapter explains the CAN protocol implementation in the MCU. i.e. it explains the function of registers/bits. However, it does not explain the protocol itself. For protocol information, refer to these excellent videos:

https://training.ti.com/ti-precision-labs-canlinsbc-can-and-can-fd-protocol?context=1139747-1138099-1139707-1138111

https://training.ti.com/ti-precision-labs-canlinsbc-can-and-can-fd-overview?context=1139747-1138099-1139707-1138109

https://training.ti.com/ti-precision-labs-canlinsbc-can-physical-layer?context=1139747-1138099-1139707-1138110

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F28M35H52C: CAN communication failure