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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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5
include/libopencm3/sam3x/eefc.h
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@ -68,6 +68,11 @@
#define EEFC_FSR_FCMDE (0x01 << 1) #define EEFC_FSR_FCMDE (0x01 << 1)
#define EEFC_FSR_FRDY (0x01 << 0) #define EEFC_FSR_FRDY (0x01 << 0)
static inline void eefc_set_latency(u8 wait)
{
EEFC_FMR(EEFC0) = (EEFC_FMR(EEFC0) & ~EEFC_FMR_FWS_MASK) | (wait << 8);
EEFC_FMR(EEFC1) = (EEFC_FMR(EEFC1) & ~EEFC_FMR_FWS_MASK) | (wait << 8);
}
#endif #endif

9
include/libopencm3/sam3x/pmc.h
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@ -125,6 +125,15 @@
#define PMC_SR_LOCKA (0x01 << 1) #define PMC_SR_LOCKA (0x01 << 1)
#define PMC_SR_MOSCXTS (0x01 << 0) #define PMC_SR_MOSCXTS (0x01 << 0)
enum mck_src {
MCK_SRC_SLOW = 0,
MCK_SRC_MAIN = 1,
MCK_SRC_PLLA = 2,
MCK_SRC_UPLL = 3,
};
void pmc_mck_set_source(enum mck_src src);
void pmc_xtal_enable(bool en, u8 startup_time);
void pmc_plla_config(u8 mul, u8 div); void pmc_plla_config(u8 mul, u8 div);
void pmc_peripheral_clock_enable(u8 pid); void pmc_peripheral_clock_enable(u8 pid);
void pmc_peripheral_clock_disable(u8 pid); void pmc_peripheral_clock_disable(u8 pid);

19
lib/sam3x/pmc.c
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@ -19,9 +19,20 @@
#include <libopencm3/sam3x/pmc.h> #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) 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; CKGR_PLLAR_PLLACOUNT_MASK | div;
while (!(PMC_SR & PMC_SR_LOCKA)); while (!(PMC_SR & PMC_SR_LOCKA));
} }
@ -42,3 +53,9 @@ void pmc_peripheral_clock_disable(u8 pid)
PMC_PCDR1 = 1 << (pid & 31); 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));
}