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	 > 嵌入式系統(tǒng) > 設(shè)計(jì)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(shí)間：2016-11-23
				來(lái)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(kāi)始是在keil4里看代碼，很混亂，后來(lái)把他粘到Notepad編輯器，一點(diǎn)擊就可以看出這個(gè)子函數(shù)到哪結(jié)束
            本文引用地址：http://www.biyoush.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(shí)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(gè)......
            [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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