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usb: Cofnigure PLLB according to board.h BOARD_MAINOSC

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Actually we don't even need to use PLLB for USB and could simply use
PLLA, but then we don't c are about the extra 2.5mA
This commit is contained in:
Harald Welte
2017-01-12 18:06:57 +01:00
parent 7861132fad
commit 84ad98585c
1 changed files with 9 additions and 3 deletions
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12
firmware/src_simtrace/usb.c
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@@ -769,6 +769,14 @@ static const USBDDriverDescriptors driverDescriptors = {
STRING_DESC_CNT /* cnt string descriptors in list */
};
#if (BOARD_MAINOSC == 12000000)
#define PLLB_CFG (CKGR_PLLBR_DIVB(2)|CKGR_PLLBR_MULB(8-1)|CKGR_PLLBR_PLLBCOUNT_Msk)
#elif (BOARD_MAINOSC == 18432000)
#define PLLB_CFG (CKGR_PLLBR_DIVB(5)|CKGR_PLLBR_MULB(13-1)|CKGR_PLLBR_PLLBCOUNT_Msk)
#else
#error "Please configure PLLB for your MAINOSC freq"
#endif
/*----------------------------------------------------------------------------
* Functions
*----------------------------------------------------------------------------*/
@@ -779,9 +787,7 @@ static const USBDDriverDescriptors driverDescriptors = {
static void _ConfigureUsbClock(void)
{
/* Enable PLLB for USB */
PMC->CKGR_PLLBR = CKGR_PLLBR_DIVB(5)
| CKGR_PLLBR_MULB(0xc) /* MULT+1=0xd */
| CKGR_PLLBR_PLLBCOUNT_Msk;
PMC->CKGR_PLLBR = PLLB_CFG;
while ((PMC->PMC_SR & PMC_SR_LOCKB) == 0) ;
/* USB Clock uses PLLB */