Re: [avr-chat] [SOLVED] Enabling external oscillator on XMEGA?

[Rick Mann]

Ah! I needed to call:

        CLKSYS_XOSC_Config(OSC_FRQRANGE_12TO16_gc, false, 
OSC_XOSCSEL_XTAL_256CLK_gc); 

before enabling the oscillator. The XPLAINED notes didn't indicate this.


On May 25, 2013, at 15:01 , Rick Mann <address@hidden> wrote:

> I'm trying to enable a 16 MHz crystal I have connected on an ATxmega256A3U. I 
> can get it to run okay using the internal 2 MHz, 32 MHz, and 2 MHz * 15 PLL 
> clocks.
> 
> But it doesn't work with the external oscillator using the following:
> 
>       CLKSYS_Enable(OSC_XOSCEN_bm);
>       do {} while (CLKSYS_IsReady(OSC_XOSCRDY_bm) == 0);
>       CLKSYS_Main_ClockSource_Select(CLK_SCLKSEL_XOSC_gc);
>       CLKSYS_Disable(OSC_RC2MEN_bm | OSC_RC32MEN_bm | OSC_RC32KEN_bm);
> 
> The crystal isn't driven, and the loop to check to see if the oscillator is 
> ready never exits.
> 
> It's possible I damaged the xtal during reflow (the oven ran 20°C hotter than 
> it should). But I'm not sure I'm not missing some crucial step in software 
> first.
> 
> Any suggestions? Thanks!
> 
> -- 
> Rick
> 
> 
> 
> 
> _______________________________________________
> AVR-chat mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/avr-chat


-- 
Rick