Clocks and IO Pins on ATSAM bsp

Isaac Gutekunst isaac.gutekunst at
Fri Jun 10 15:20:34 UTC 2016

I've attached a super rough, probably buggy way to print some clock information, and attempt to configure the clocks related to CAN1 to reasonable values. This may be helpful in understanding where I am in this process.


On 06/10/2016 11:15 AM, Isaac Gutekunst wrote:
> Hi Everyone,
> I'm moving along with our project here at Vecna, and am working to bring up the MCAN controller on the ATSAMV71Q21 processor. I'm having a fun time figuring out the clock tree, and bringing the peripheral up.
> Are there any recommended ways of configuring all the clocks and enabling the GPIO pins to bring up a peripheral?
> I'm doing an awkward mix of calling functions provided by Atmel, e.g. PIO_Configure(pinsMcan1, PIO_LISTSIZE(pinsMcan1)); (wrapped in a #ifndef __rtems__ in mcan.c), and twiddling bits in the variou PMC control registers: e.g.
>   PMC->PMC_PCK[5] &= ~(PMC_PCK_CSS_Msk);
>   PMC->PMC_PCK[5] |= ((2 << PMC_PCK_CSS_Pos) & PMC_PCK_CSS_Msk);
>   PMC->PMC_PCK[5] &= ~(PMC_PCK_PRES_Msk );
>   PMC->PMC_PCK[5] |= ((11 << PMC_PCK_PRES_Pos ) & PMC_PCK_PRES_Msk);
>   PMC_EnablePeripheral(ID_MCAN1);;
> So far, I haven't gotten the peripheral to work, but that's a matter of struggling forward. I'm curious if anyone has already figured any of this out, and can offer advice.
> Thanks,
> Isaac
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