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jvog.sen
Associate II
since ‎2022-03-28
‎2023-06-15

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  • 14 Posts
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User Activity

Permanent current drain from VBAT

2022-11-15
Hi,we are using a coin cell to supply the internal RTC of an STM32MP157 when our system is unpowered.This works as expected - as long as the external supply is off. As soon as the system is powered on, the battery is discharged with >20µA.Observing t...

USB compliance testing

2022-07-28
Hi, and yet another question...We would like to perform electrical compliance testing on our USB ports. This requires each port to send a test pattern.Our board has one upstream and two downstream facing ports. The upstream port can be set into vario...

Inaccurate measurement of VREFINT

2022-07-22
Hi everyone!I see unexpected values when measuring VREFINT. The ADC measures around 1.18V, on some boards even 1.16V, which is outside the tolerance according to the datasheet: Reading the calibration value VREFIN_CAL from OTP memory returns a value ...

Strange behaviour when writing to RTC calibration register

2022-07-07
Hi everyone,I am trying to trim the internal RTC of an STM32MP157 to run slightly faster. According to the reference manual, you need to set bits CALP and CALM[8:0] in RTC_CALR to do so.Here is what I did (using devmem2:(# Enable write access to RTC_...

Unable to set DDR clock

2022-05-17
Hello,I am having a hard time setting the DDR clock at pll2 for an stm32mp157.The clock has been configured to 528MHz using CubeMX. I checked cfg for pll2 in the DeviceTree against the Datasheet / Referance Manual and all settings seem correct.Yet /s...
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