Niklas Gürtler 5479c58d23 tcl/target/stm32l4, tcl/target/stm32w*: Fix clock configuration ...

For stm32l4, stm32wbx, stm32wlx the target tcl scripts try to change the
MSI oscillator's speed to 24 MHz before boosting the interface
frequency, but don't clear the RCC_CR_MSIRANGE field correctly before.
This causes the register write access to fail and leaves the clock
frequency unchanged. For the stm32wlx, the script also neglects to set
the MSIRGSEL bit, such that the frequency setting is not actually
applied.

The issue appears to not cause a problem when using an ST-Link adapter.
When using an FT4232HP, communication to the target fails after the
reset-init event, possibly because this adapter actually supports the
higher interface frequency.

This commit fixes the register accesses to make sure the RCC_CR_MSIRANGE
is cleared to zero before OR-ing the new value. For the stm32wlx, also
set the MSIRGSEL bit. Just to be safe, also fix the write access to the
FLASH_ACR_LATENCY field to clear it before OR-ing, even though it should
be zero at reset anyways.

Change-Id: Ie8320fa6ee2086981c0b1f3c18f51e171709078d
Signed-off-by: Niklas Gürtler <profclonk@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/9282
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Tested-by: jenkins

2025-12-12 19:14:30 +00:00

4.9 KiB

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