S5PV210初始化系统时钟

// 时钟相关寄存器 #define APLL_LOCK ( *((volatile unsigned long *)0xE0100000) ) #define MPLL_LOCK ( *((volatile unsigned long *)0xE0100008) ) #define APLL_CON0 ( *((volatile unsigned long *)0xE0100100) ) #define APLL_CON1 ( *((volatile unsigned long *)0xE0100104) ) #define MPLL_CON ( *((volatile unsigned long *)0xE0100108) ) #define CLK_SRC0 ( *((volatile unsigned long *)0xE0100200) ) #define CLK_SRC1 ( *((volatile unsigned long *)0xE0100204) ) #define CLK_SRC2 ( *((volatile unsigned long *)0xE0100208) ) #define CLK_SRC3 ( *((volatile unsigned long *)0xE010020c) ) #define CLK_SRC4 ( *((volatile unsigned long *)0xE0100210) ) #define CLK_SRC5 ( *((volatile unsigned long *)0xE0100214) ) #define CLK_SRC6 ( *((volatile unsigned long *)0xE0100218) ) #define CLK_SRC_MASK0 ( *((volatile unsigned long *)0xE0100280) ) #define CLK_SRC_MASK1 ( *((volatile unsigned long *)0xE0100284) ) #define CLK_DIV0 ( *((volatile unsigned long *)0xE0100300) ) #define CLK_DIV1 ( *((volatile unsigned long *)0xE0100304) ) #define CLK_DIV2 ( *((volatile unsigned long *)0xE0100308) ) #define CLK_DIV3 ( *((volatile unsigned long *)0xE010030c) ) #define CLK_DIV4 ( *((volatile unsigned long *)0xE0100310) ) #define CLK_DIV5 ( *((volatile unsigned long *)0xE0100314) ) #define CLK_DIV6 ( *((volatile unsigned long *)0xE0100318) ) #define CLK_DIV7 ( *((volatile unsigned long *)0xE010031c) ) #define CLK_DIV0_MASK 0x7fffffff #define APLL_MDIV 0x7d #define APLL_PDIV 0x3 #define APLL_SDIV 0x1 #define MPLL_MDIV 0x29b #define MPLL_PDIV 0xc #define MPLL_SDIV 0x1 #define set_pll(mdiv, pdiv, sdiv) (1<<31 | mdiv<<16 | pdiv<<8 | sdiv) #define APLL_VAL set_pll(APLL_MDIV,APLL_PDIV,APLL_SDIV) #define MPLL_VAL set_pll(MPLL_MDIV,MPLL_PDIV,MPLL_SDIV) //#define PLL_OFF void clock_init() { // 1 设置各种时钟开关，暂时不使用PLL CLK_SRC0 = 0x0; #ifndef PLL_OFF // 2 设置锁定时间，使用默认值即可 // 设置PLL后，时钟从Fin提升到目标频率时，需要一定的时间，即锁定时间 APLL_LOCK = 0x0000FFFF; MPLL_LOCK = 0x0000FFFF; // 3 设置分频 CLK_DIV0 = 0x14131440; // 4 设置PLL // FOUT= MDIV * FIN / (PDIV*2^(SDIV-1)) = 0x7d*24/(0x3*2^(1-1))=1000 MHz APLL_CON0 = APLL_VAL; // FOUT = MDIV*FIN/(PDIV*2^SDIV)=0x29b*24/(0xc*2^1)= 667 MHz MPLL_CON = MPLL_VAL; // 5 设置各种时钟开关，使用PLL CLK_SRC0 = 0x10001111; #endif }