[rtems-docs commit] user/bsps/imxrt: Info about ARM PLL frequency
Christian Mauderer
christianm at rtems.org
Fri Jul 2 11:53:03 UTC 2021
Module: rtems-docs
Branch: master
Commit: 72ae964c5a88baddfb67483a0cb88dd736e06766
Changeset: http://git.rtems.org/rtems-docs/commit/?id=72ae964c5a88baddfb67483a0cb88dd736e06766
Author: Christian Mauderer <christian.mauderer at embedded-brains.de>
Date: Fri May 28 15:58:41 2021 +0200
user/bsps/imxrt: Info about ARM PLL frequency
Update #4180
---
user/bsps/arm/imxrt.rst | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/user/bsps/arm/imxrt.rst b/user/bsps/arm/imxrt.rst
index 8a5ee28..3f8b270 100644
--- a/user/bsps/arm/imxrt.rst
+++ b/user/bsps/arm/imxrt.rst
@@ -123,6 +123,26 @@ with your FDT source names)::
Make sure that your new C file is compiled and linked into the application.
+PLL Settings
+------------
+
+The commercial variant of the i.MXRT1052 on the evaluation board allows a clock
+up to 600MHz for the ARM core. For some industrial variants only up to 528MHz
+are specified. To make it possible to adapt to these variants the application
+can overwrite the following constant:
+
+.. code-block:: c
+
+ #include "fsl_clock_config.h"
+
+ const clock_arm_pll_config_t armPllConfig_BOARD_BootClockRUN = {
+ .loopDivider = 100,
+ .src = 0,
+ };
+
+With the default configuration of a 24MHz oscillator, the loopDivider has to be
+88 for the 528MHz.
+
Clock Driver
------------
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