Bug in STM32F2 ADC low level driver LL_ADC_REG_Init regarding sequencerlength

[Richy]

STM32F2: (possibly other families like F4 may be affected too - not verified)

Library: STM32Cube_FW_F2_V1.7.0

Component:

ADC Low Level Driver (file stm32f2xx_ll_adc.c)

Affected function: LL_ADC_REG_Init

register CR1 is wrongly initialized with SequencerLength which should be written into SQR1 register only. SequencerLength is additionally written by function LL_ADC_REG_SetSequencerLength in function LL_ADC_REG_Init, which is correct.

Workaround: set sequencer length to LL_ADC_REG_SEQ_SCAN_DISABLE in initialization structure used by function LL_ADC_REG_Init.

Afterward call LL_ADC_REG_SetSequencerLength with the sequencer legnth required by your application.

HAL implementation seems to be correct.

[Amel NASRI]

Hi @Richy​ ,

Thanks for reporting this issue.

I confirm that it is valid for STM32F4 and I would like to inform you that it is tracked internally to be fixed in coming versions of Cube packages.

-Amel

[Amel NASRI]

Hello,

Please note that the fix is available in the patch 1.24.2 of STM32CubeF4 package (already available on the web).

-Amel