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board_lowlevel.c: Improve main oscillator initialization

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* ensure the PB8/PB9 pins are actually not in GPIO mode, which they
  apparently are on boot-up
* ensure that neither pull-up nor pull-down are enabled on PB8/PB9
* ensure we first start the oscillator, before selecting it

The sum of the above changes seems to make oscillator start-up much more
reliable than before.  The time needed for initialization is now pretty
stable, and the occasional 15-20second clock stabiliziation has not been
observed with this change.
This commit is contained in:
Harald Welte
2016-03-16 20:40:19 +01:00
parent a0cf200695
commit 5e00400a05
1 changed files with 5 additions and 2 deletions
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7
firmware/src_board/board_lowlevel.c
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@@ -94,14 +94,17 @@ extern WEAK void LowLevelInit( void )
*/
/* Initialize main oscillator */
/* if ( !(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) )
if ( !(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) )
{
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN;
timeout = 0;
while (!(PMC->PMC_SR & PMC_SR_MOSCXTS) && (timeout++ < CLOCK_TIMEOUT));
}*/
}
/* Switch to 3-20MHz Xtal oscillator */
PIOB->PIO_PDR = (1 << 8) | (1 << 9);
PIOB->PIO_PUDR = (1 << 8) | (1 << 9);
PIOB->PIO_PPDDR = (1 << 8) | (1 << 9);
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL;
/* wait for Main XTAL oscillator stabilization */
timeout = 0;