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bsp/atsam: Add option to disable 32kHz XTAL.

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This commit is contained in:
Christian Mauderer
2018-01-11 08:54:27 +01:00
committed by Christian Mauderer
parent a3eec5cf35
commit 03fecae9c4
3 changed files with 14 additions and 0 deletions
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4
c/src/lib/libbsp/arm/atsam/README
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@@ -43,6 +43,10 @@ const struct BOARD_Sdram_Config BOARD_Sdram_Config = {
};
--------
Use ATSAM_SLOWCLOCK_USE_XTAL=0 to disable the usage of the external 32kHz
oscillator for the slow clock. This is useful for example for the SAM E70
Xplained kit.
Use ATSAM_CONSOLE_BAUD=XYZ to set the initial baud for console devices (default
115200).

8
c/src/lib/libbsp/arm/atsam/configure.ac
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@@ -72,6 +72,14 @@ RTEMS_BSPOPTS_HELP([ATSAM_MCK],
[Frequency of the MCK in Hz. Set to 0 to force application defined speed.
See startup/pmc-config.c for available clock configurations.])
RTEMS_BSPOPTS_SET([ATSAM_SLOWCLOCK_USE_XTAL],[*],[1])
RTEMS_BSPOPTS_HELP([ATSAM_SLOWCLOCK_USE_XTAL],
[Use the external crystal as source for the slow clock instead of the internal
RC oscillator. Note that on the ATSAM the NRST pin seems to depend on the slow
clock as well as all watchdogs. If ATSAM_SLOWCLOCK_USE_XTAL is set to 1 without
a external crystal connected, the controller might hang in the switching process
without a working NRST pin. ])
RTEMS_BSPOPTS_SET([ATSAM_CHANGE_CLOCK_FROM_SRAM],[*],[0])
RTEMS_BSPOPTS_HELP([ATSAM_CHANGE_CLOCK_FROM_SRAM],
[Move the functions that set up the clock into the SRAM.

2
c/src/lib/libbsp/arm/atsam/libraries/libboard/resources_v71/system_samv71.c
View File

@@ -93,6 +93,7 @@ extern "C" {
* OSC
*/
#if ATSAM_SLOWCLOCK_USE_XTAL == 1
read_MOR = PMC->CKGR_MOR;
/* enable external crystal - enable RC OSC */
read_MOR |= (CKGR_MOR_KEY_PASSWD | CKGR_MOR_XT32KFME);
@@ -104,6 +105,7 @@ extern "C" {
while (!(SUPC->SUPC_SR & SUPC_SR_OSCSEL));
}
#endif
/* Initialize main oscillator */
if (!(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL)) {