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FlexCAN gpio selection -- I-MX6 Solo Controller

Question asked by kees Jurgen on Sep 4, 2013
Latest reply on Sep 9, 2013 by jimmychan

Hi,

 

Previously i have used MCF521x controller & there i use to select the GPIO to activate CAN bus Pins of Flexcan in this way.

 

#define FLEXCAN_GPIO_INIT()   MCF_GPIO_PUCPAR = 0 | MCF_GPIO_PUCPAR_URXD2_CANRX | MCF_GPIO_PUCPAR_UTXD2_CANTX;

 

Do we have to Activate CAN Bus pins in I-max6 solo controller also ?

 

I am JUst going through the DataSheet for the Imax6 Solo processor.

i.MX6 Solo Reference Manual


And found that there is multiplexing for CAN1 TX/RX pins. On Page -315 it tells about FLEXCAN1_RX & FLEXCAN1_TX pins Multiplexing.

Also tells how to activate these PIN.


For  CAN_1 transmit pin, FLEXCAN1_TX, there are three PADS :----


Pads(Pins)                                                    Registers

GPIO_7 (ALT3)                      IOMUXC_SW_MUX_CTL_PAD_GPIO07

KEY_COL2 (ALT2)                IOMUXC_SW_MUX_CTL_PAD_KEY_COL2

SD3_CMD (ALT2)                  IOMUXC_SW_MUX_CTL_PAD_SD3_CMD

 

Now I am having a question how can a single controller FlexCAN_1 can have its TX pin enabled on 3 PADS ?

 

Does it means :----

Same CAN TX signal CAN be routed to Three different PAD's ?

or I-MAX6 solo comes in 3 different types of controller with diffrent Pads/Pin configuration ?

 

Any suggestion will be welcomed .

 

//Kees

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