STLink - ako funguje odmeriavanie napajacieho napatia targetu?

Jan Waclawek konfera na efton.sk
Pátek Únor 12 11:56:29 CET 2021


Tak som cvicne na Disco-L053 skusil:

d:\Program Files\STMicroelectronics\STM32 ST-LINK Utility 4.5\ST-LINK
Utility>ST-LINK_CLI.exe -c SWD -TVolt
STM32 ST-LINK CLI v3.5.0.0
STM32 ST-LINK Command Line Interface

ST-LINK SN: 0666FF515056805087112621
ST-LINK Firmware version: V2J34M25
Connected via SWD.
SWD Frequency = 4000K.
Target voltage = 3.2 V
Connection mode: Normal
Reset mode: Software reset
Device ID: 0x419
Device flash Size: 1024 Kbytes
Device family: STM32F42xxx/F43xxx

Target voltage = 3.250 V



To zapojenie je takmer identicke s Nucleom, az na to, ze ten 4k7/4k7 delic
je tu odvodeny nie od nodu oznaceneho +3V3 (co je vystup stabilizatora
urceny pre onboard target) ale +3V3_ST_LINK (co je vystup stabilizatora
pre STLINK) - toto sice nedava ziadny zmysel, ale co uz.

Potom som skratol horny 4k7 odpor, cim som viacmenej nasimuloval externy
zdroj 3.3V:

d:\Program Files\STMicroelectronics\STM32 ST-LINK Utility 4.5\ST-LINK
Utility>ST-LINK_CLI.exe -c SWD -TVolt
STM32 ST-LINK CLI v3.5.0.0
STM32 ST-LINK Command Line Interface

ST-LINK SN: 0666FF515056805087112621
ST-LINK Firmware version: V2J34M25
Connected via SWD.
SWD Frequency = 4000K.
Target voltage = 6.5 V
Connection mode: Normal
Reset mode: Software reset
Device ID: 0x417
Device flash Size: 64 Kbytes
Device family: STM32L05x/L06x/L010

Target voltage = 6.504 V


Cize logika typu "ak som na PA0 nameral > 1.15V, znamena to, ze niekto
zapojil R9=100Ohm a pretlacil 4k7/4k7 delic externym napatim, takze uz
nemam nasobit dvomi" tam implementovana nie je.

wek



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