diff options
Diffstat (limited to 'bsp/drivers/fe300prci/fe300prci_driver.h')
| -rw-r--r-- | bsp/drivers/fe300prci/fe300prci_driver.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/bsp/drivers/fe300prci/fe300prci_driver.h b/bsp/drivers/fe300prci/fe300prci_driver.h index 243e6de..7100f46 100644 --- a/bsp/drivers/fe300prci/fe300prci_driver.h +++ b/bsp/drivers/fe300prci/fe300prci_driver.h @@ -54,15 +54,23 @@ void PRCI_use_pll(int refsel, int bypass, void PRCI_use_default_clocks(); /* This routine will adjust the HFROSC trim - * as the PLL clock source, measure the resulting - * frequency, and attempt to get close to the requested - * frequency. It returns the actual measured frequency. + * while using HFROSC as the clock source, + * measure the resulting frequency, then + * use it as the PLL clock source, + * in an attempt to get over, under, or close to the + * requested frequency. It returns the actual measured + * frequency. * * Note that the requested frequency must be within the * range supported by the PLL so not all values are * achievable with this function, and not all - * are guaranteed to actually work. + * are guaranteed to actually work. The PLL + * is rated higher than the hardware. + * + * There is no check on the desired f_cpu frequency, it + * is up to the user to specify something reasonable. */ + uint32_t PRCI_set_hfrosctrim_for_f_cpu(uint32_t f_cpu, PRCI_freq_target target); __END_DECLS |