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soc: sam0: samd5x: xosc32 configurable startup time

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Adds Kconfig option to configure the startup time of the external
32KHz crystal oscillator.

Signed-off-by: Thomas Schranz <electronics@wandfluh.com>
This commit is contained in:
Thomas Schranz 2024-12-13 10:16:08 +01:00 • committed by Fabio Baltieri
commit cd20154bc7
2 changed files with 16 additions and 3 deletions
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8
soc/atmel/sam0/common/Kconfig.samd5x
View file

@ -10,6 +10,14 @@ config SOC_ATMEL_SAMD5X_XOSC32K
startup. This can then be selected as the main clock source
for the SOC.
config SOC_ATMEL_SAMD5X_XOSC32K_STARTUP
depends on SOC_ATMEL_SAMD5X_XOSC32K
hex "Startup time external 32 kHz crystal oscillator"
range 0x0 0x6
default 0x1
help
Selects the startup time for the external 32 kHz crystal oscillator.
choice
prompt "Main clock source"
default SOC_ATMEL_SAMD5X_DEFAULT_AS_MAIN

11
soc/atmel/sam0/common/soc_samd5x.c
View file

@ -18,13 +18,18 @@
#define SAM0_DFLL_FREQ_HZ (48000000U)
#define SAM0_DPLL_FREQ_MIN_HZ (96000000U)
#define SAM0_DPLL_FREQ_MAX_HZ (200000000U)
#define SAM0_XOSC32K_STARTUP_TIME CONFIG_SOC_ATMEL_SAMD5X_XOSC32K_STARTUP
#if CONFIG_SOC_ATMEL_SAMD5X_XOSC32K_AS_MAIN
static void osc32k_init(void)
{
OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_ENABLE | OSC32KCTRL_XOSC32K_XTALEN
| OSC32KCTRL_XOSC32K_EN32K | OSC32KCTRL_XOSC32K_RUNSTDBY
| OSC32KCTRL_XOSC32K_STARTUP(0) | OSC32KCTRL_XOSC32K_CGM_XT;
OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_ENABLE
| OSC32KCTRL_XOSC32K_XTALEN
| OSC32KCTRL_XOSC32K_CGM_XT
| OSC32KCTRL_XOSC32K_EN32K
| OSC32KCTRL_XOSC32K_RUNSTDBY
| OSC32KCTRL_XOSC32K_STARTUP(SAM0_XOSC32K_STARTUP_TIME)
;
while (!OSC32KCTRL->STATUS.bit.XOSC32KRDY) {
}