c code

[joemccarr]

Posted on October 23, 2016 at 02:16

Hello folks,

Would anyone know why this does NOT work  while (DMA1->ISR & DMA_ISR_TCIF1==0);    //wait until transfer complete but this WORKs     tc_flag=DMA1->ISR & DMA_ISR_TCIF1; //save transfer complete flag     while (!tc_flag){                                                         tc_flag=DMA1->ISR & DMA_ISR_TCIF1;    //wait until transfer complete }    Thank you #c

[michaelc.barton9]

Posted on October 23, 2016 at 09:43

does your compiler not give you a warnimg like mine ? eg:

src\main.c 49 warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] hint: Operator Precedence

[Tesla DeLorean]

Posted on October 23, 2016 at 16:31

Try

while ((DMA1->ISR & DMA_ISR_TCIF1) == 0);    //wait until transfer complete

[joemccarr]

Posted on October 25, 2016 at 00:46

Michael, my compiler does not give me a warning.

That worked clive1, thank you

[michaelc.barton9]

Posted on October 25, 2016 at 09:21

''Michael, my compiler does not give me a warning.''

I'm using ARM-GCC compiler not setup anything special (Em:Blocks) it doesn't give quite all issues, but is pretty good ''That worked clive1, thank you'' yes, but

why

! how will you know to avoid this error in future, especially since your compiler is giving you any warnings !

[qwer.asdf]

Posted on October 25, 2016 at 10:27

> yes, but

why

!

> how will you know to avoid this error in future, especially since your

> compiler is giving you any warnings ! The code was valid C. There were no syntax errors. So the warning that the up-to-date compilers are giving is a courtesy.McC.Joe, my advice would be to better learn the C language, use an updated GCC version, and make sure you are telling your compiler to be verbose about the errors and warnings, something like this must be OK (I'd use -Werror too but some of ST libraries throw warnings and restrict us from using such strict but safer compiler options): -std=c99 -Wall -Wextra -Wformat -Wformat-security -Wno-missing-field-initializers -Wno-unused-function -Wno-unused-but-set-variable -fno-strict-aliasing