Understand SD Card detect pin initialization

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@DYann.1 wrote:

This refers to lines of code that I am lost, for the first line for example

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Where are you lost?

Those are just standard C macros.

So this code

 /* Configure SD pin detect */
 __SD_DETECT_GPIO_CLK_ENABLE();
 __HAL_RCC_PWR_CLK_ENABLE();

expands to this:

__HAL_RCC_GPIOG_CLK_ENABLE();

do { 
 __IO uint32_t tmpreg; 
 SET_BIT(RCC->AHB2ENR, RCC_AHB2ENR_GPIOGEN); 
 /* Delay after an RCC peripheral clock enabling */ 
 tmpreg = READ_BIT(RCC->AHB2ENR, RCC_AHB2ENR_GPIOGEN); 
 UNUSED(tmpreg); 
} while(0);

which is equivalent to this:

__HAL_RCC_GPIOG_CLK_ENABLE();

__IO uint32_t tmpreg; 
SET_BIT( RCC->AHB2ENR, RCC_AHB2ENR_GPIOGEN ); 
/* Delay after an RCC peripheral clock enabling */ 
tmpreg = READ_BIT( RCC->AHB2ENR, RCC_AHB2ENR_GPIOGEN ); 
UNUSED(tmpreg); 

PS:

If  it's the  while(0) you're worried about, it's a standard C trick to make a multi-line macro which can be used anywhere - just like a function call:

https://c-faq.com/cpp/multistmt.html

https://stackoverflow.com/questions/923822/whats-the-use-of-do-while0-when-we-define-a-macro

https://cboard.cprogramming.com/c-programming/82858-do-%7B%7D-while-0-;.html