No HSE output using MCO1

[Stratosstratos]

Hello,

I am trying to output the HSE to a GPIO PA8.

I want to do it from scratch and have added this code to the HID example from ST.

RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;  // Enable GPIOA clock
		GPIOA->MODER &= ~GPIO_MODER_MODE8;          // Clear the mode bits for PA8
		GPIOA->MODER |= GPIO_MODER_MODE8_1;         // Set PA8 as alternate function
		GPIOA->AFR[1] &= ~GPIO_AFRH_AFSEL8;         // Clear AF selection for PA8
		GPIOA->AFR[1] |= (0x00 << GPIO_AFRH_AFSEL8_Pos); // Set PA8 to AF0 (MCO1)
		RCC->CFGR &= ~RCC_CFGR_MCO1;              // Clear the MCO1 source

		//Choose Source
		RCC->CFGR |= RCC_CFGR_MCO1_0;             // Select HSE as MCO1 source

		RCC->CFGR &= ~RCC_CFGR_MCO1PRE;           // Clear the MCO1 prescaler bits
		RCC->CFGR |= RCC_CFGR_MCO1PRE; 		 // Set MCO1PRE bits to 010 for division by 5

 The code works only for HSI and PLL ( confirmed with an oscilloscope).
What could be causing HSE not to be outputted ?
I tried with and without the prescaler enabled.

I am also attaching the whole project file.

[waclawek.jan]

And this is exactly the non-systemic naming I've talked about above, not to mention the shifted value which as I explained above is improper.

Also, some of the Cube/HAL symbols are NOT what you'd expect, e.g. including not only values for given bitfield but also markers for Cube/HAL's internal use.

So, I keep insisting on that Cube/HAL symbols are NOT to be used generally, outside Cube/HAL.

JW