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sam3x: Add some PMC convenience functions.

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This commit is contained in:
Gareth McMullin
2013-04-30 13:05:06 -07:00
committed by Piotr Esden-Tempski
parent dde1d82fb1
commit fcd527d31b
3 changed files with 32 additions and 1 deletions
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19
lib/sam3x/pmc.c
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@@ -19,9 +19,20 @@
#include <libopencm3/sam3x/pmc.h>
void pmc_xtal_enable(bool en, u8 startup_time)
{
if (en) {
CKGR_MOR |= CKGR_MOR_KEY |
CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCXTST_MASK;
while (!(PMC_SR & PMC_SR_MOSCXTS));
} else {
CKGR_MOR = CKGR_MOR_KEY | (CKGR_MOR & ~CKGR_MOR_MOSCXTEN);
}
}
void pmc_plla_config(u8 mul, u8 div)
{
CKGR_PLLAR = CKGR_PLLAR_ONE | (mul << 16) |
CKGR_PLLAR = CKGR_PLLAR_ONE | ((mul - 1) << 16) |
CKGR_PLLAR_PLLACOUNT_MASK | div;
while (!(PMC_SR & PMC_SR_LOCKA));
}
@@ -42,3 +53,9 @@ void pmc_peripheral_clock_disable(u8 pid)
PMC_PCDR1 = 1 << (pid & 31);
}
void pmc_mck_set_source(enum mck_src src)
{
PMC_MCKR = (PMC_MCKR & ~PMC_MCKR_CSS_MASK) | src;
while (!(PMC_SR & PMC_SR_MCKRDY));
}