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Merge pull request #13783 from benpicco/cpu/samd5x/reinit-dfll

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cpu/samd5x: work around errata when (re-)initializing DFLL
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Dylan Laduranty 2020-04-01 18:07:53 +02:00 committed by GitHub
commit 744896b062
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1 changed files with 12 additions and 3 deletions
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15
cpu/samd5x/cpu.c
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@ -64,9 +64,14 @@ static void dfll_init(void)
#endif
;
OSCCTRL->DFLLCTRLB.reg = reg;
OSCCTRL->DFLLCTRLA.reg = OSCCTRL_DFLLCTRLA_ENABLE;
/* workaround for Errata 2.8.3 DFLLVAL.FINE Value When DFLL48M Re-enabled */
OSCCTRL->DFLLMUL.reg = 0; /* Write new DFLLMULL configuration */
OSCCTRL->DFLLCTRLB.reg = 0; /* Select Open loop configuration */
OSCCTRL->DFLLCTRLA.bit.ENABLE = 1; /* Enable DFLL */
OSCCTRL->DFLLVAL.reg = OSCCTRL->DFLLVAL.reg; /* Reload DFLLVAL register */
OSCCTRL->DFLLCTRLB.reg = reg; /* Write final DFLL configuration */
OSCCTRL->DFLLCTRLA.reg = OSCCTRL_DFLLCTRLA_ENABLE;
while (!OSCCTRL->STATUS.bit.DFLLRDY) {}
}
@ -152,8 +157,12 @@ void cpu_pm_cb_enter(int deep)
void cpu_pm_cb_leave(int deep)
{
(void) deep;
/* will be called after wake-up */
if (deep) {
/* DFLL needs to be re-initialized to work around errata 2.8.3 */
dfll_init();
}
}
/**