STM32C031C6, m0+, how to create a 32-bit timer with TIM1 and TIM3?

[kag_embedded]

I would like to use TIM1 and TIM3 as a performance counter to evaluate my software application.  Is there an example of how to configure TIM1 and TIM3 to chain their 16-bit counters to create a 32-bit counter?

From reading the reference manual, I can how to trigger TIM3 from an internal trigger signal, but I did not see how I can set TIM1 to pulse a single cycle on the trigger line upon overflow or a compare of the counter to 0xffff.

I am using the STM32C031C6.

Thank you.

[waclawek.jan · Accepted solution]

- set TIM1_CR2.MMS to 0b010 for Update to generate TRGO signal

- set TIM3_SMCR.TS to 0b000 to select TRGI to be ITR0 which for TIM3 is TIM1 (that's the reset value so you can leave it as it is; but would master be a different timer you would need to set TS according to Table 86. TIMx Internal trigger connection)

- set TIM3_SMCR.SMS to 0b111 for External Clock Mode1

JW