STM32F discovery doesn't execute code after programming successfully

Question

I have a stm32f051R8T6 Discovery board, and I compiled a simple blinking LED code to activate the LED's on the board itself. The code builds successfully and flashes the MCU but the MCU won't execute the code, I have reset it and tried programming it with a different code which worked in the past but still no luck, I am working in Coocox.

Once I have the hex file I flash the MCU with either the STM32 st-link unity or Coocox itself and both say it flashes successfully

I think the MCU is held under reset but I'm not sure and I don't know how to get it out.

THe link to the manual is here: http://www.st.com/content/ccc/resource/technical/document/user_manual/30/ae/6e/54/d3/b6/46/17/DM00050135.pdf/files/DM00050135.pdf/jcr:content/translations/en.DM00050135.pdf

Code is Below

#include "stm32f0xx.h"
void delay(const int d);
int main(void)
{
 // GPIOC Periph clock enable
 RCC->AHBENR |= RCC_AHBENR_GPIOCEN;
 // PC8 and PC9 in output mode
 GPIOC->MODER |= (GPIO_MODER_MODER8_0 | GPIO_MODER_MODER9_0);
 // Push pull mode selected
 GPIOC->OTYPER &= ~(GPIO_OTYPER_OT_8 | GPIO_OTYPER_OT_9);
 // Maximum speed setting
 GPIOC->OSPEEDR |= (GPIO_OSPEEDER_OSPEEDR8 | GPIO_OSPEEDER_OSPEEDR9);
 // Pull-up and pull-down resistors disabled
 GPIOC->PUPDR &= ~(GPIO_PUPDR_PUPDR8 | GPIO_PUPDR_PUPDR9);
 while(1)
 {
 // Set PC9
 GPIOC->BSRR = GPIO_BSRR_BS_9;
 // Reset PC8
 GPIOC->BSRR = GPIO_BSRR_BR_8;
 // Delay ~ 1 sec.
 delay(SystemCoreClock/8);
 // Reset PC9
 GPIOC->BSRR = GPIO_BSRR_BR_9;
 // Set PC8
 GPIOC->BSRR = GPIO_BSRR_BS_8;
 // Delay ~ 1 sec.
 delay(SystemCoreClock/8);
 }
}
void delay(const int d)
{
 volatile int i;
 for(i=d; i>0; i--){ ; }
 return;
}

• pipe: What kind of debug equipment do you have? Multimeter? Oscilloscope? Logic analyzer?
• user150963: I have a Multimeter and an Oscilloscope available
• po.pe: If you try to flash one of the example projects it doesn't work either? Can you run the code in debug mode to see what happens?

Answer 1

The problem lay with the Coocox library files, what I did was uninstall the program and re-installed it and it worked successfully.