FLAG status

[arunl4g]

Posted on February 26, 2016 at 16:18

Hi 

i am a newbie. i have seen some examples, sometimes they clear the flag and sometimes they dont clear the flag. Could anyone please tell me when it is needed to clear r no need to clear_..

example : i am waiting for the DMA to finish ...but i am  not clearing the flag when i contunue to send again.  Do i need to clear the flag after checking ?

[Amel NASRI]

Posted on February 26, 2016 at 17:42

Hi kaka,

Some flags are cleared by hardware, others need to be cleared by software.

A flag is cleared by hardware when an expected condition is reached or when some actions are done (Ex: read a given register).

So, in all cases, you have to refer to the flag description in the reference manual to know how it is cleared.

-Mayla-

[Tesla DeLorean]

Posted on February 26, 2016 at 17:54

If you are reinitializing the DMA No, if you are running it in circular mode Yes.

[arunl4g]

Posted on February 27, 2016 at 11:42

thank you .

i also cant understand what will happen when i give ''RCC_APB2PeriphResetCmd''. 

example: void RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);

Does the USART! register values goes to zero when i give RCC_APB2PeriphResetCmd?

[pkumar1883]

Posted on February 29, 2016 at 08:15

Yes all USART1 register will have the RESET values. For example all pending Flags will be cleared.

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