STM32L4xx COMP inputs in HAL and LL

[waclawek.jan]

Based on discussion here, conclusion is, that given in 'L45x/'L46x there's no DAC1_CH2, and in 'L41x/'L42x no DAC at all, these are unavailable for inputs selectable for COMP for these sub-families of the low-end 'L4xx family group handled collectively by RM0394.

Description in stm32l4xx_hal_comp.c does not tell these completely, and there are also references to 'L43x/'L44x having some exceptions, which based on RM/DS doesn't appear to be the case:

Also, macros in stm32l4xx_ll_comp.c don't take the missing DAC channels into account, and they should.

Can these be looked at, please.

Thanks,

JW

[Saket_Om]

Hello @waclawek.jan 

According to the datasheet of L452 there is two dac channels for this MCU.

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@waclawek.jan wrote:

Also, macros in stm32l4xx_ll_comp.c don't take the missing DAC channels into account, and they should.

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 Could you explain more about this point please?

[waclawek.jan]

Hi @Saket_Om ,

Also, there is no DAC1_OUT2 in the pin definitions tables in 'L451 nor 'L452 DS.

If this is true, the IS_LL_COMP_INPUT_MINUS macro in stm32l4xx_ll_comp.c should have a different variant for the 'L45x/'L46x, omitting the option to use  LL_COMP_INPUT_MINUS_DAC1_CH2.

JW

[Saket_Om]

Hello @waclawek.jan 

Thank you for bringing this issue to our attention.

I reported this internally.

Internal ticket number: CDM0063195 (This is an internal tracking number and is not accessible or usable by customers).