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OLIMEX / ESP32-EVB

ESP32 WiFi / BLE Development board with Ethernet interface, Relays, microSD card
Apache License 2.0
248 stars 107 forks source link

CAN bus cannot receive anything #31

Closed githubxup closed 3 years ago

githubxup commented 3 years ago

I tried to receive messages from CAN bus by this board with CAN demo example, but nothing was happened. I verified that the CAN sender is fine by using arduino UNO + CAN bus shield, and the messages are received as expected. Do you have any suggestion? Thank you

James

DanKoloff commented 3 years ago

1) Make sure that the hardware connections are proper, CAN-HI is next to the power jack, CAN-LOW is in the middle.

2) Try another software, there is default CAN driver in ESP-IDF just change the pins to the ones we use.

3) In ESP32-EVB, the default the termination resistor is disconnected. Try enabling the termination resistor, it is actually required to have the termination resistors enabled in first and last node of a CAN network. If you have only two CAN devices you need to have termination circuits of both. To enable the termination resistor - close jumper CAN_T1 - solder carefully its pads together to establish connection.

githubxup commented 3 years ago

Hi DanKoloff,

I got it work after sodering CAN_T1. Thank you a lot.

James