It's really nuts how much functionality is packed into these little microcontrollers. But it makes configuring them a bit obtuse.
Here's the code that (I hope) configures GPIO pin D11 to act as an external reset line for Timer 8:<code> // CH2 = input capture mapped to TI2, used as DEN trigger source<br> TIM8->CCMR1 &= ~(<br> TIM_CCMR1_CC2S_Msk |<br> TIM_CCMR1_IC2PSC_Msk |<br> TIM_CCMR1_IC2F_Msk<br> );<br> TIM8->CCMR1 |= TIM_CCMR1_CC2S_0; // CC2 mapped to TI2<br><br> // Apply a modest digital filter (fSAMPLING = fDTS, N = 8) to ignore noise<br> TIM8->CCMR1 |= (0x3UL << TIM_CCMR1_IC2F_Pos);<br><br> TIM8->CCER |= TIM_CCER_CC2E;<br></code>
gloriouscow
npub1dh…qud8y
2026-04-12 16:48:03 UTC
in reply to nevent1q…walf
Author Public Key
npub1dhl6470pzgczhuy6yxgpf595l998vppl0jje2swukmwyk7qny6dq0qud8ySeen on
wss://relay.momostr.pinkPublished at
2026-04-12 16:48:03 UTCEvent JSON
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"content": "It's really nuts how much functionality is packed into these little microcontrollers. But it makes configuring them a bit obtuse.\n\nHere's the code that (I hope) configures GPIO pin D11 to act as an external reset line for Timer 8:\u003ccode\u003e // CH2 = input capture mapped to TI2, used as DEN trigger source\u003cbr\u003e TIM8-\u0026gt;CCMR1 \u0026amp;= ~(\u003cbr\u003e TIM_CCMR1_CC2S_Msk |\u003cbr\u003e TIM_CCMR1_IC2PSC_Msk |\u003cbr\u003e TIM_CCMR1_IC2F_Msk\u003cbr\u003e );\u003cbr\u003e TIM8-\u0026gt;CCMR1 |= TIM_CCMR1_CC2S_0; // CC2 mapped to TI2\u003cbr\u003e\u003cbr\u003e // Apply a modest digital filter (fSAMPLING = fDTS, N = 8) to ignore noise\u003cbr\u003e TIM8-\u0026gt;CCMR1 |= (0x3UL \u0026lt;\u0026lt; TIM_CCMR1_IC2F_Pos);\u003cbr\u003e\u003cbr\u003e TIM8-\u0026gt;CCER |= TIM_CCER_CC2E;\u003cbr\u003e\u003c/code\u003e",
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