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	 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > SystemInit()函數(shù)的結(jié)構(gòu)分析
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          SystemInit()函數(shù)的結(jié)構(gòu)分析
          
						
          
				作者：
				時間：2016-11-23
				來源：網(wǎng)絡(luò)
				
				
				
				
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			系統(tǒng)函數(shù)調(diào)用順序startup_stm32f10x_cl.s→ SystemInit() → SetSysClock()→ SetSysClockTo72()
          總結(jié):開始是在keil4里看代碼，很混亂，后來把他粘到Notepad編輯器，一點(diǎn)擊就可以看出這個子函數(shù)到哪結(jié)束
          本文引用地址：http://www.ex-cimer.com/article/201611/320445.htm
          [cpp]view plaincopy
          1. #ifdefined(STM32F10X_LD_VL)||(definedSTM32F10X_MD_VL)||(definedSTM32F10X_HD_VL)
          2. /*#defineSYSCLK_FREQ_HSEHSE_VALUE*/
          3. #defineSYSCLK_FREQ_24MHz24000000
          4. #else
          5. /*#defineSYSCLK_FREQ_HSEHSE_VALUE*/
          6. /*#defineSYSCLK_FREQ_24MHz24000000*/
          7. /*#defineSYSCLK_FREQ_36MHz36000000*/
          8. /*#defineSYSCLK_FREQ_48MHz48000000*/
          9. /*#defineSYSCLK_FREQ_56MHz56000000*/
          10. #defineSYSCLK_FREQ_72MHz72000000
          11. #endif
          下面定義的SystemCoreClock 變量是為了方便取出幾種情況下系統(tǒng)時鐘的實(shí)際值，例SYSCLK_FREQ_24MHz 也就是24000000。
          [cpp]view plaincopy
          1. #ifdefSYSCLK_FREQ_HSE
          2. uint32_tSystemCoreClock=SYSCLK_FREQ_HSE;/*!equency(CoreClock)*/
          3. #elifdefinedSYSCLK_FREQ_24MHz
          4. uint32_tSystemCoreClock=SYSCLK_FREQ_24MHz;/*!
          5. #elifdefinedSYSCLK_FREQ_36MHz
          6. uint32_tSystemCoreClock=SYSCLK_FREQ_36MHz;/*!
          7. #elifdefinedSYSCLK_FREQ_48MHz
          8. uint32_tSystemCoreClock=SYSCLK_FREQ_48MHz;/*!
          9. #elifdefinedSYSCLK_FREQ_56MHz
          10. uint32_tSystemCoreClock=SYSCLK_FREQ_56MHz;/*!
          11. #elifdefinedSYSCLK_FREQ_72MHz
          12. uint32_tSystemCoreClock=SYSCLK_FREQ_72MHz;/*!
          13. #else/*!
          14. uint32_tSystemCoreClock=HSI_VALUE;/*!
          15. #endif
          [cpp]view plaincopy
          1. staticvoidSetSysClock(void)
          2. {
          3. #ifdefSYSCLK_FREQ_HSE
          4. SetSysClockToHSE();
          5. #elifdefinedSYSCLK_FREQ_24MHz
          6. SetSysClockTo24();
          7. #elifdefinedSYSCLK_FREQ_36MHz
          8. SetSysClockTo36();
          9. #elifdefinedSYSCLK_FREQ_48MHz
          10. SetSysClockTo48();
          11. #elifdefinedSYSCLK_FREQ_56MHz
          12. SetSysClockTo56();
          13. #elifdefinedSYSCLK_FREQ_72MHz
          14. SetSysClockTo72();
          15. #endif
          17. /*Ifnoneofthedefineaboveisenabled,theHSIisusedasSystemclock
          18. source(defaultafterreset)*/
          19. }

          [cpp]view plaincopy
          1. #ifdefSYSCLK_FREQ_HSE
          2. /**
          3. *@briefSelectsHSEasSystemclocksourceandconfigureHCLK,PCLK2
          4. *andPCLK1prescalers.
          5. *@noteThisfunctionshouldbeusedonlyafterreset.
          6. *@paramNone
          7. *@retvalNone
          8. */
          9. staticvoidSetSysClockToHSE(void)
          10. {
          11. ......
          12. }

          [cpp]view plaincopy
          1. #elifdefinedSYSCLK_FREQ_24MHz
          2. /**
          3. *@briefSetsSystemclockfrequencyto24MHzandconfigureHCLK,PCLK2
          4. *andPCLK1prescalers.
          5. *@noteThisfunctionshouldbeusedonlyafterreset.
          6. *@paramNone
          7. *@retvalNone
          8. */
          9. staticvoidSetSysClockTo24(void)
          10. {
          11. ........
          12. }

          [cpp]view plaincopy
          1. #elifdefinedSYSCLK_FREQ_36MHz
          2. /**
          3. *@briefSetsSystemclockfrequencyto36MHzandconfigureHCLK,PCLK2
          4. *andPCLK1prescalers.
          5. *@noteThisfunctionshouldbeusedonlyafterreset.
          6. *@paramNone
          7. *@retvalNone
          8. */
          9. staticvoidSetSysClockTo36(void)
          10. {
          11. ......
          12. }
          省略幾個......
          [cpp]view plaincopy
          1. #elifdefinedSYSCLK_FREQ_72MHz
          2. /**
          3. *@briefSetsSystemclockfrequencyto72MHzandconfigureHCLK,PCLK2
          4. *andPCLK1prescalers.
          5. *@noteThisfunctionshouldbeusedonlyafterreset.
          6. *@paramNone
          7. *@retvalNone
          8. */
          9. staticvoidSetSysClockTo72(void)
          10. {
          11. .......
          12. }
          這樣結(jié)構(gòu)就很明晰了。				             
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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