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atmel-samd: Stop relying on an external crystal.

This commit is contained in:
Scott Shawcroft 2016-11-07 12:37:38 -08:00
parent 23112a6434
commit acc4fe4d7d
2 changed files with 10 additions and 8 deletions
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3
atmel-samd/asf/sam0/drivers/system/clock/clock_samd21_r21_da/clock.c
View File

@ -203,7 +203,8 @@ uint32_t system_clock_source_get_hz(
_system_dfll_wait_for_sync();
/* Check if operating in closed loop mode */
if (_system_clock_inst.dfll.control & SYSCTRL_DFLLCTRL_MODE) {
if ((_system_clock_inst.dfll.control & SYSCTRL_DFLLCTRL_MODE) &&
!( _system_clock_inst.dfll.control & SYSCTRL_DFLLCTRL_USBCRM )) {
return system_gclk_chan_get_hz(SYSCTRL_GCLK_ID_DFLL48) *
(_system_clock_inst.dfll.mul & 0xffff);
}

9
atmel-samd/asf_conf/conf_clocks.h
View File

@ -71,7 +71,7 @@
# define CONF_CLOCK_XOSC_RUN_IN_STANDBY false
/* SYSTEM_CLOCK_SOURCE_XOSC32K configuration - External 32KHz crystal/clock oscillator */
# define CONF_CLOCK_XOSC32K_ENABLE true
# define CONF_CLOCK_XOSC32K_ENABLE false
# define CONF_CLOCK_XOSC32K_EXTERNAL_CRYSTAL SYSTEM_CLOCK_EXTERNAL_CRYSTAL
# define CONF_CLOCK_XOSC32K_STARTUP_TIME SYSTEM_XOSC32K_STARTUP_65536
# define CONF_CLOCK_XOSC32K_AUTO_AMPLITUDE_CONTROL false
@ -89,8 +89,9 @@
# define CONF_CLOCK_OSC32K_RUN_IN_STANDBY false
/* SYSTEM_CLOCK_SOURCE_DFLL configuration - Digital Frequency Locked Loop */
// USB Clock Source fixed at DFLL.
# define CONF_CLOCK_DFLL_ENABLE true
# define CONF_CLOCK_DFLL_LOOP_MODE SYSTEM_CLOCK_DFLL_LOOP_MODE_CLOSED
# define CONF_CLOCK_DFLL_LOOP_MODE SYSTEM_CLOCK_DFLL_LOOP_MODE_USB_RECOVERY
# define CONF_CLOCK_DFLL_ON_DEMAND true
/* DFLL open loop mode configuration */
@ -139,7 +140,7 @@
# define CONF_CLOCK_GCLK_0_OUTPUT_ENABLE false
/* Configure GCLK generator 1 */
# define CONF_CLOCK_GCLK_1_ENABLE true
# define CONF_CLOCK_GCLK_1_ENABLE false
# define CONF_CLOCK_GCLK_1_RUN_IN_STANDBY false
# define CONF_CLOCK_GCLK_1_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_XOSC32K
# define CONF_CLOCK_GCLK_1_PRESCALER 1
@ -153,7 +154,7 @@
# define CONF_CLOCK_GCLK_2_OUTPUT_ENABLE false
/* Configure GCLK generator 3 */
# define CONF_CLOCK_GCLK_3_ENABLE true
# define CONF_CLOCK_GCLK_3_ENABLE false
# define CONF_CLOCK_GCLK_3_RUN_IN_STANDBY false
# define CONF_CLOCK_GCLK_3_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
# define CONF_CLOCK_GCLK_3_PRESCALER 1