Help with PC8 blinking LED - STM32F051

[miriam]

Posted on September 28, 2016 at 04:36

I try to run the following program on KEIL MDK 5.0:

&sharpinclude ''stm32f0xx.h''int main(void){ volatile unsigned int i=0; RCC -> AHBENR |= (i<<19); GPIOC ->MODER |= (i<<16); // mode GPIOC ->ODR |= (i<<8); // output data is ON   while (1)  { for (i=0; i<1000000; i++) GPIOC ->ODR |= (i<<8); // output data is ON for (i=0; i<1000000; i++) GPIOC ->ODR &= (i<<8); // output data is OFF   }  }From some reason I don't see the BLUE LED blinking.Anyone know why?Thanks,Miri #stm32f051-stm32-stm32f0

[michaelc.barton9]

Posted on September 28, 2016 at 10:19

I'll just hightlight a bit of your code:

volatile unsigned int i=0; RCC -> AHBENR |= (i<<19); etc I realise the Std Peripheral Library is no longer supported, but it really is quite useful and makes the code far more readable eg: RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

[miriam]

Posted on September 28, 2016 at 13:02Thank you Michael,Where can I find a list of all supported commands?

[michaelc.barton9]

Posted on September 28, 2016 at 14:28

I'm not sure if there is a complete list of commands per se...

for starting, I would recommend downloading the

http://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-eval-tools/stm32-mcu-eval-tools/stm32-mcu-discovery-kits/stm32f0discovery.html

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32048.html

(link at bottom of page) This has a good range of example code and should be easy to adapt for most other F0 boards to force the compiler to use the libraries, USE_STDPERIPH_DRIVER needs to be defined in: stm32f0xx.h and the Std peripheral files to be included in a project (you can selectvely en/disable them in the stm32f0xx_conf.h file but I usually just leave them all enabled) Usefully, there's also a compiled help-file: stm32f0xx_stdperiph_lib_um.chm

[Tesla DeLorean]

Posted on September 28, 2016 at 14:58

Missing a tilde, the code you had won't clear the bit

GPIOC ->ODR &= ~(i<<8); // output data is OFF Consider using a debugger and stepping the code to understand where it fails.

[miriam]

Posted on September 29, 2016 at 17:19

From some reason I can't find the ''

stm32f0xx.h'' file in my computer.

I have the 

STM32F0xx_hal.h.

where can it be downloaded?Where should I locate it?Is it neccesary to 

STM32F051R8 ?

[Tesla DeLorean]

Posted on September 29, 2016 at 17:41

It is part of the Standard Peripheral Library, to which a link was posted earlier

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32048.html

Get Software (v1.5.0) bottom of the page.I unpack them in the \Keil\ARM\Examples\ST directory

[miriam]

Posted on September 29, 2016 at 18:03I found the correct command for the clock.However he led still not blinking.What else can be wrong with: 

GPIOC ->ODR |= (i<<8); // output data is ON.

[Tesla DeLorean]

Posted on September 29, 2016 at 18:08

Why are you using i (letter) for these shifts instead of 1 (one)? It makes no sense.

Pay attention to what the GPIO registers get set to, and that they are configured correctly. Review the manual, look at the registers in the debugger.

[Tesla DeLorean]

Posted on September 29, 2016 at 18:14

#include ''stm32f0xx.h''
int main(void){
volatile unsigned int i=0;
RCC -> AHBENR |= (1<<
19
); // GPIOC
GPIOC ->MODER |= (1<<
16
); // mode 01b Output
GPIOC ->ODR |= (1<<
8
); // output data is ON
while (1) {
for (
i
=
0
; i<1000000; i++); // delay
GPIOC ->ODR |= (1<<
8
); // output data is ON
for (
i
=
0
; i<1000000; i++); // delay
GPIOC ->ODR &= ~(1<<8); // output data is OFF 
}
}