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Author Author: lycaste
Date Created: 5 Oct 2014 12:18 PM Date Created
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RioTboard canbus utilisation

lycaste

5 Oct 2014

Hi,

I am finding a solution to use the Flexcan 1 or 2 on the RiotBoard.

Can someone give me some information about the subject please?

wangyeee over 11 years ago in reply to lycaste

GPIO 7 or 8 is not accessible from the expansion port, so you need to use the SD3 port. But then you have to boot from eMMC as now the tf card port it connected to your CAN transceiver. IMHO, the built-in Android may not be great to try with CAN bus, so I'll install Linux in eMMC instead. The FlexCAN is supported by Linux kernel for quite a while(https://github.com/torvalds/linux/blob/master/drivers/net/can/flexcan.c).
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lycaste over 11 years ago in reply to wangyeee

FLEXCAN1 RX is multiplexed with GPIO8 / KEYROW2 / SD3CLK
FLEXCAN1 TX is multiplexed with GPIO7 / KEYCOL2 / SD3CMD

FLEXCAN2 RX is multiplexed with KEYROW2 / SD3DAT1
FLEXCAN2 TX is multiplexed with KEYCOL4 / SD3DAT0

I wonder if FLEXCAN1 is usable of the expansion board (GPIO7 & 8 are accessible) ?
This is with the condition of not using the SD3 port and I2C4 function.

Am I right?
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wangyeee over 11 years ago

Although the i.MX6 processor supports FlexCAN, there is no connectors on the RIoTBoard. You may want use transceiver like MCP2515MCP2515 which makes use of SPI connectors on the RIoTBoard's expansion port to communicate via CAN bus.
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