spl RCC config for external oscillator

[mahdi zamani]

Posted on July 30, 2017 at 10:57

hi 

i have connected &sharposcillator to &sharpOSC_IN (PD0) i used this function for init &sharpRCC at &sharpSTM32F103c8t6

but is not work with &sharppll and &sharpexternal oscillator please help to me ...

void RCC_Configuration(void){

ErrorStatus HSEStartUpStatus; RCC_DeInit(); /// RCC system reset(for debug purpose) RCC_HSEConfig(RCC_HSE_Bypass); /// Enable HSE HSEStartUpStatus = RCC_WaitForHSEStartUp(); /// Wait till HSE is ready if(HSEStartUpStatus == SUCCESS) { RCC_HCLKConfig(RCC_SYSCLK_Div1); /// HCLK = SYSCLK RCC_PCLK2Config(RCC_HCLK_Div1); /// PCLK2 = HCLK RCC_PCLK1Config(RCC_HCLK_Div2); /// PCLK1 = HCLK/2 RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); /// PLLCLK = 8MHz * 9 = 72 MHz RCC_PLLCmd(ENABLE); /* Enable PLL */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); /// Wait till PLL is ready RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /// Select PLL as system clock source while(RCC_GetSYSCLKSource() != 0x08); /// Wait till PLL is used as system clock source }}

thanks 

mahdi

oscillator #uphill-skiing

[Tesla DeLorean]

Posted on July 30, 2017 at 15:53

If you have an XO that's on all the time, lose

HSEStartUpStatus = RCC_WaitForHSEStartUp(); /// Wait till HSE is ready

if(HSEStartUpStatus == SUCCESS)

Make sure you set the flash wait states before switching to the 72 MHz clock.

[mahdi zamani]

Posted on August 01, 2017 at 12:29

sorry 

can give me example of this ?

[Tesla DeLorean]

Posted on August 01, 2017 at 20:12

Doesn't the SPL have a whole bunch of examples? Here's a quick cleanup of yours using the advice I provided..

void RCC_Configuration(void)
{
 RCC_DeInit(); /// RCC system reset(for debug purpose)
 RCC_HSEConfig(RCC_HSE_Bypass); /// Enable HSE, already on and hot
 FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); // Enable Prefetch Buffer
 FLASH_SetLatency(FLASH_Latency_2); // Flash 2 wait state
 RCC_HCLKConfig(RCC_SYSCLK_Div1); /// HCLK = SYSCLK
 RCC_PCLK2Config(RCC_HCLK_Div1); /// PCLK2 = HCLK
 RCC_PCLK1Config(RCC_HCLK_Div2); /// PCLK1 = HCLK/2
 RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); /// PLLCLK = 8MHz * 9 = 72 MHz
 RCC_PLLCmd(ENABLE); // Enable PLL
 while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); /// Wait till PLL is ready
 RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /// Select PLL as system clock source
 while(RCC_GetSYSCLKSource() != 0x08); /// Wait till PLL is used as system clock source
}
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[mahdi zamani]

Posted on August 02, 2017 at 21:35

omg

thanks

Turvey.Clive.002

[mahdi zamani]

Posted on August 04, 2017 at 12:31

Hello

I used the following function, but the problem persists and the controller is not loaded and the program does not run.Should I look for something else for this bug?In my samples, I did not see a comprehensive example of this!Thankful

[Tesla DeLorean]

Posted on August 04, 2017 at 17:13

The Standard Peripheral Library v3.5.0 has a host of examples, the code to set clocks is typically in system_stm32f1xx.c

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32054.html

 

Assuming you'd using something half-assed like CooCox?

Examples use Keil or IAR, and utilize CMSIS properly, whereby SystemInit() is called prior to main() to set up clocks and memory. The code in system_stm32f1xx.c should do whatever board specific work your board requires. The compiler should pass in a define identifying the class of STM32F1 device you are using.

Discuss specific of your board with its vendor, and review any schematics or other materials provided by them.

[mahdi zamani]

Posted on August 22, 2017 at 13:42

My bug is hardware is not for programme