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STM32H7 RCC clock output configuration not working #852

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chris-durand opened this issue Apr 29, 2022 · 0 comments · Fixed by #853
Closed

STM32H7 RCC clock output configuration not working #852

chris-durand opened this issue Apr 29, 2022 · 0 comments · Fixed by #853
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@chris-durand
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bug 🐞
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2022q2

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@chris-durand
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The RCC driver has the following code:

%% if target.family in ["f2", "f4", "f7", "h7"]
	static inline bool
	enableClockOutput1(ClockOutput1Source src, uint8_t div)
	{
		uint32_t tmp = RCC->CFGR & ~(RCC_CFGR_MCO1 | RCC_CFGR_MCO1PRE);
		if (div > 1) tmp |= (div + 2) << 24;
		RCC->CFGR = tmp | uint32_t(src);
		return true;
	}

The prescaler calculation does not match the device registers:
mco
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@chris-durand chris-durand

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bug 🐞
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2022q2
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Fix STM32H7 RCC clock output chris-durand/modm
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