STM32C5 MCU COMP2_IN Pins assignment

[blaziBUCK]

Dear Gentlemen,

as a relative beginner using STM32C5 MCU-s,
I need your help to resolve one issue.

Namely,

In new design,  where planned MCU is STM32C542CCT6 device, (LQFP48 package),
I plan to use internal Comparator COMP2.

Problem (for me) arises when I have to declare connection between Comparator nodes
(INP-  (M), INP + (P) and OUTPUT) with some specific pins on LQFP48 package,
    more precisely it would be ideal for me to use 
PA7 pin as Comparator2 Output
and pin PA2 as Comparator2 -INPut, 
and pin PA3 as Comparator2 +INPut.

In short,
it is not a problem to "connect" Comparator Output, COMP2_OUT as shown in 
Table 12 STM32C542xx pin/ball definition, on STM32C542xx data sheet (DS), page 41, or in 
Table 13 Alternate functions, 

since i will declare AF14 = COMP2_OUT in appropriate GPIOA_AFRL register, 
see page 352 in RM0522 Reference manual, (RM)

but I have problem to declare Comparator2 INPut pins, since it is selected thru peripheral registers,
as stated in Table 11 in device DS, 
...Additional functions / Functions directly selected/enabled through peripheral registers...

However, 
when I look at Comparator2 INPSEL bits, from page 712 in RM
Table 169. COMP implementation non-inverting input assignment for STM32C53x/542

I see three (3) Input signals, with "names"
COMP2_INP1
COMP2_INP2
COMP2_INP3

also,
when I look at Comparator2 INMSEL bits, from page 714 in RM
Table 172. COMP inverting input assignment

I see three (3) Input signals, with "names"
COMP2_INM1
COMP2_INM2
COMP2_INM3

but, in DS page 41,
Pin name PA2 could be connected with Additional functions :
ADC1_IN2,
COMP2_INM,
OPAMP1_VINM0,
TAMP_IN3, WKUP2

my question is, what I have to do, 
to "connect" pin PA2 with COMP2_INM, and with one of three(3) 
COMP2_INM1
COMP2_INM2
COMP2_INM3 choices ?

Besides, the very same question is :

in DS page 41,
Pin name PA3 could be connected with Additional functions :
ADC1_IN3,
COMP2_INP

my question is, what I have to do, 
to "connect" pin PA3 with COMP2_INP, and with one of three(3) 
COMP2_INP1
COMP2_INP2
COMP2_INP3 choices ?

Many thanks for your help !

[mƎALLEm]

Hello ​@blaziBUCK and welcome to the ST community,

I’m not sure I understood the question. Are you asking about the correspondence between COMP2_INPx/COMP2_INMx and the GPIO pin (which IO pin)?

By using CubeMX2 tool 

COMP2_INP:

IO1: PA3

IO2: PB15

IO3: PC0

COMP2_INM:

IO1: PC1

IO2: PC5

IO3: PA2

Meanwhile, I don’t see the I/O correspondence with COMPx-INy in the documentation.

I’m checking internally. Internal ticket for follow-up: CDM0063783

[mƎALLEm]

​@blaziBUCK 

This post has been marked by you as Best Answer. Did you unmark it?

 

[blaziBUCK]

Dear ST Technical Moderator,
(mEALLEm)

Yes,

I unmarked it for a moment/Temporarily,  until I got reply to my second message,

if possible to get some code snippet as generated in CubeMX2…

 

Then, I hope the problem is completely solved with your help !

(besides, what about the documents, not mentioning the “correspondence ” ?)

 

best regards,

Blazimir

[mƎALLEm]

​@blaziBUCK 

A new question = new post.

I need to move the second question to CubeMx forum board with label CubeMx2.

I’ve already moved it: 

When the correspondence of COMP input pins with I/Os this post should be closed.

Thank you.