HELP! SIMPLE APP WONT WORK

[tre2020067]

Posted on September 16, 2011 at 07:57

just tryin to send PE.06 high but its not workin. is it my sourcecode? IT DOES compile without error or warnings.

#include ''stm32f10x_lib.h''

void Clk_Init (void)

{

  // 1. Clocking the controller from internal HSI RC (8 MHz)

  RCC_HSICmd(ENABLE);

  // wait until the HSI is ready

  while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);

  RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);

  // 2. Enable ext. high frequency OSC

  RCC_HSEConfig(RCC_HSE_ON);

  // wait until the HSE is ready

  while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);

  // 3. Init PLL

  RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9); // 72MHz

  RCC_PLLCmd(ENABLE);

  // wait until the PLL is ready

  while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

  // 4. Set system clock dividers

  RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);

  RCC_ADCCLKConfig(RCC_PCLK2_Div8);

  RCC_PCLK2Config(RCC_HCLK_Div1);

  RCC_PCLK1Config(RCC_HCLK_Div2);

  RCC_HCLKConfig(RCC_SYSCLK_Div1);

#ifdef EMB_FLASH

  // 5. Init Embedded Flash

  // Zero wait state, if 0 < HCLK 24 MHz

  // One wait state, if 24 MHz < HCLK 56 MHz

  // Two wait states, if 56 MHz < HCLK 72 MHz

  // Flash wait state

  FLASH_SetLatency(FLASH_Latency_2);

  // Half cycle access

  FLASH_HalfCycleAccessCmd(FLASH_HalfCycleAccess_Disable);

  // Prefetch buffer

  FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

#endif // EMB_FLASH

  // 5. Clock system from PLL

  RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

}

////////////////////////////////

//

//

//

//Start MAIN function

//

//

//

//////////////////////////////

void main(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

 

  #ifdef DEBUG

   debug();

#endif

  

  

     // Init clock system

  Clk_Init();

  

 

  // GPIO Init

  // Enable GPIO clock and release reset

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);

  RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, DISABLE); 

 

 

 

 

    // Assign PE6 to LED

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; 

  GPIO_Init(GPIOE, &GPIO_InitStructure);

 

   GPIO_WriteBit(GPIOE,GPIO_Pin_6,Bit_SET);

 

   while(1)

   {

   }

  

}

#ifdef  DEBUG

/*******************************************************************************

* Function Name  : assert_failed

* Description    : Reports the name of the source file and the source line number

*                  where the assert_param error has occurred.

* Input          : - file: pointer to the source file name

*                  - line: assert_param error line source number

* Output         : None

* Return         : None

*******************************************************************************/

void assert_failed(u8* file, u32 line)

{

  /* User can add his own implementation to report the file name and line number,

     ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */

  /* Infinite loop */

  while (1)

  {

  }

}

#endif

[tre2020067]

Posted on September 17, 2011 at 15:20

still nothing. but i think its the clock init function.

when clock init starts theres a push operation which goes to register 7. but at the end of the clock init function there is a pop which moves contents from register 0 to the PC which is 0xFFFFFFFE.  why would it be doing this?

[tre2020067]

Posted on September 18, 2011 at 21:55

I finanly got it working. Thanks for the help guys!

turns out it was the last function call of clock_init()

// 5. Clock system from PLL

RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

After the function call it pops 0xFFFFFFFE on to the stack.

the question is why?

[raptorhal2]

Posted on September 19, 2011 at 05:20

So how did you finally get it working ? Inquiring minds want to know.

Cheers, Hal

[Tesla DeLorean]

Posted on September 19, 2011 at 08:51

Chances are by not initializing the clocks, and using the standard reset conditions, or whatever startup was setting them too.

I'd probably ensure after both RCC_SYSCLKConfig() that it would spin waiting for the correct clock source to actually engage.