How to edit APB1, APB2 Timer Multiplier value in stm32cubeMX GUI?

[hemantraj undale]

Posted on February 10, 2017 at 06:21

How to edit APB1, APB2 Timer Multiplier value in stm32cubeMX (clock configuration) GUI tool?

How to change following values manually?

Thanks for reading!!

[T J]

Posted on February 10, 2017 at 06:52

You can only adjust the APB1 and APB2 prescalers.

the x1 box that you have highlighted is unchangeable.

[Tesla DeLorean]

Posted on February 10, 2017 at 07:03

It will be X1 or X2 depending on the divisor selected for the APB. You can then manage the timers using the prescaler.

What is it that you hope to achieve?

[hemantraj undale]

Posted on February 10, 2017 at 07:12

Thanks marsh.nick for reply.

These values gets changed automatically if we change APB prescaler value (dropdown selection box).

I just want to select manually one value out of available value of APB1,2 Timer multiplier value. 

I want following configuration,

Ethernet clock, sys clock, HCLK, FCLK = 168Mhz

APB1 peripheral clk, APB1 Timer Clock = 42Mhz

APB2 peripheral clk, APB2 Timer Clock = 84Mhz.

USB clock = 42Mhz.

How to set ?

I have one .ioc file which has above said values, but I cannot set same values in newly created .ioc file.

All other values in clock configuration page are identical (except APB1,2 Timer Multiplier value

)

There has to be some way to set above values?

[hemantraj undale]

Posted on February 10, 2017 at 07:14

Thanks Clive One for reply.

Please read above reply, about what I want.

'

These values gets changed automatically if we change APB prescaler value (dropdown selection box).

I just want to select manually one value out of available value of APB1,2 Timer multiplier value. 

I want following configuration,

Ethernet clock, sys clock, HCLK, FCLK = 168Mhz

APB1 peripheral clk, APB1 Timer Clock = 42Mhz

APB2 peripheral clk, APB2 Timer Clock = 84Mhz.

USB clock = 42Mhz.

How to set ?

I have one .ioc file which has above said values, but I cannot set same values in newly created .ioc file.

All other values in clock configuration page are identical (except APB1,2 Timer Multiplier value

)

There has to be some way to set above values?

'

[T J]

Posted on February 10, 2017 at 10:29

I am running cube 4.0 and easily got those values you have described, but the USB clock should be 48MHz.

I had to add an external xtal to make it work, attached.

you will probably need the 25MHz crystal anyhow for the Ethernet.

________________ Attachments : F417VGT usb incorrect.ioc.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HywF&d=%2Fa%2F0X0000000bE5%2FT75KUSQB7qhpEyC5wMHrt33uY1AJtvJx5tzbg.E6KVc&asPdf=falseF417VGT - correct.ioc.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HywA&d=%2Fa%2F0X0000000bE7%2FGIyeWX55LEQ4OEMMfWoRW4K.rt_dPHyRTXBuJJ7wxi8&asPdf=false