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user/bsps/imxrt: Info about ARM PLL frequency

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Update #4180
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Christian Mauderer 2021-05-28 15:58:41 +02:00
parent 78a1ae1755
commit 72ae964c5a
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user/bsps/arm/imxrt.rst
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@ -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
------------