S3C2440 定时器的实现，

/**************************************************************** NAME: u2440mon.c DESC: u2440mon entry point,menu,download ****************************************************************/ #define GLOBAL_CLK 1 #include <stdlib.h> #include <string.h> #include "def.h" ////声明数据类型 #include "option.h" ////声明系统时钟的寄存器 PCLK，FCLK，UCLK等 #include "2440addr.h" ////声明寄存器，中断源，中断清除函数 #include "2440lib.h" ////声明UARTDelay,蜂鸣器，改变系统时钟等函数? #include "2440slib.h" ////MMU #include "mmu.h" #include "profile.h" ////声明了timer的几个函数 #include "memtest.h" ////声明了mentest这个函数 extern char Image$$RO$$Limit[]; extern char Image$$RO$$Base[]; extern char Image$$RW$$Limit[]; extern char Image$$RW$$Base[]; extern char Image$$ZI$$Limit[]; extern char Image$$ZI$$Base[]; void Isr_Init(void); /* void HaltUndef(void); void HaltSwi(void); void HaltPabort(void); void HaltDabort(void); */ int consoleNum; /////////////////syetem clock////////////////////////////// static U32 cpu_freq; static U32 UPLL; void SetSysClock(U8 uClockType,U8 *pkey,U32 *pmpll_val) { switch ( uClockType ) { case 0: //200 *pkey= 12; *pmpll_val= (92<<12)|(4<<4)|(1); break; case 1: //300 *pkey= 13; *pmpll_val = (67<<12)|(1<<4)|(1); break; case 2: //400 *pkey= 14; *pmpll_val= (92<<12)|(1<<4)|(1); break; case 3: //440!!! *pkey = 14; *pmpll_val = (102<<12)|(1<<4)|(1); break; default: *pkey = 14; *pmpll_val = (92<<12)|(1<<4)|(1); break; } } static void CalCpuBusClk(U32 *pFCLK, U32 *pHCLK ,U32 *pPCLK ,U32 *pUCLK,U32 *pcpu_freq,U32 *pUPLL) { U32 val; U8 m, p, s; val = rMPLLCON; m = (val>>12)&0xff; p = (val>>4)&0x3f; s = val&3; //(m+8)*FIN*2 不要超出32位数! *pFCLK = ((m+8)*(FIN/100)*2)/((p+2)*(1<<s))*100; val = rCLKDIVN; m = (val>>1)&3; p = val&1; val = rCAMDIVN; s = val>>8; switch (m) { case 0: *pHCLK = *pFCLK; break; case 1: *pHCLK = *pFCLK>>1; break; case 2: if(s&2) *pHCLK =*pFCLK>>3; else *pHCLK = *pFCLK>>2; break; case 3: if(s&1) *pHCLK = *pFCLK/6; else *pHCLK = *pFCLK/3; break; default:break; } if(p) *pPCLK = *pHCLK>>1; else *pPCLK = *pHCLK; if(s&0x10) *pcpu_freq =*pHCLK; else *pcpu_freq = *pFCLK; val = rUPLLCON; m = (val>>12)&0xff; p = (val>>4)&0x3f; s = val&3; *pUPLL = ((m+8)*FIN)/((p+2)*(1<<s)); *pUCLK = (rCLKDIVN&8)?(*pUPLL>>1):*pUPLL; } ////////////////////////////LED/////////////////////////////////// #define GPB_PIN5 (1<<5) //LED1 #define GPB_PIN6 (1<<6) //LED2 #define GPB_PIN7 (1<<7) //LED3 #define GPB_PIN8 (1<<8) //LED4 void Delay2(void) { int i; for(i=0;i<300000;i++) {;} } void set_pin_GPB(U32 pin_num) { rGPBDAT|=pin_num; } void clr_pin_GPB(U32 pin_num) { rGPBDAT&=~(pin_num); } static void __irq Key_ISR0(void) { U32 r; EnterCritical(&r); ClearPending(BIT_EINT0); Uart_Printf(" interrupt occur\n"); clr_pin_GPB(GPB_PIN5); Delay2(); ExitCritical(&r); } void config_GPB5678_output(void) { rGPBCON&=~((3<<10)|(3<<12)|(3<<14)|(3<<16)); rGPBCON|=(1<<10)|(1<<12)|(1<<14)|(1<<16); rGPBUP&=~((1<<5)|(1<<6)|(1<<7)|(1<<8)); } ///////////////////////Extern Inerrupt 0///////////////////// void config_CPF0_int(void) { rGPFCON&=~(3<<0); rGPFCON|=(2<<0); //设置GPF0为外部中断 rEXTINT0&=~(7<<0); //设置为低电平触发 ClearPending(BIT_EINT0); pISR_EINT0=(U32)Key_ISR0; EnableIrq(BIT_EINT0); } //////////////////////key////////////////////////////////////// #define ERROR 0xFF #define GPF_PIN0 0 #define GPF_PIN1 1 #define GPF_PIN2 2 #define GPF_PIN4 4 void config_GPF0124_input(void) { rGPFCON&=~((3<<0)|(3<<2)|(3<<4)|(3<<8)); rGPFUP&=~((1<<0)|(1<<1)|(1<<2)|(1<<4)); } U8 read_pin_GPF0124(U8 pin_num) { U8 temp; switch(pin_num) { case 0:return rGPFDAT&0x01; case 1:return (rGPFDAT&0x02)>>1; case 2:return (rGPFDAT&0x04)>>2; case 4:return (rGPFDAT&0x10)>>4; default:return ERROR; } } //////////////////////TIMER0////////////////////////////// /* #define pISR_TIMER0 (*(unsigned *)(_ISR_STARTADDRESS+0x48)) #define rTCFG0 (*(volatile unsigned *)0x51000000) //Timer 0 configuration #define rTCFG1 (*(volatile unsigned *)0x51000004) //Timer 1 configuration #define rTCON (*(volatile unsigned *)0x51000008) //Timer control #define rTCNTB0 (*(volatile unsigned *)0x5100000c) //Timer count buffer 0 #define rTCMPB0 (*(volatile unsigned *)0x51000010) //Timer compare buffer 0 #define rTCNTO0 (*(volatile unsigned *)0x51000014) //Timer count observation 0 #define BIT_TIMER0 (0x1<<10) */ static void __irq Timer4_ISR() { U32 r; EnterCritical(&r); ClearPending(BIT_TIMER4); clr_pin_GPB(GPB_PIN7); Delay2(); ExitCritical(&r); } static void __irq Timer0_ISR() { U32 r; static U8 flag=TRUE; EnterCritical(&r); ClearPending(BIT_TIMER0); if(flag) { clr_pin_GPB(GPB_PIN5); } else { set_pin_GPB(GPB_PIN5); } flag=!flag; ExitCritical(&r); } void ConfigTimer4() { ClearPending(BIT_TIMER4); EnableIrq(BIT_TIMER4); rTCFG0 &= 0xFF00FF; rTCFG0 |= 0xf900; // prescaler等于249+1 rTCFG1 &= ~0xF0000; rTCFG1 |= 0x20000; //divider等于8，则设置定时器4的时钟频率为25kHz rTCNTB4 = 12500; //让定时器4每隔0.5秒中断一次 rTCON &= ~0xF00000; rTCON |= 0x700000; rTCON &= ~0x200000 ; //定时器4开始工作 pISR_TIMER4 = (U32)Timer4_ISR; } void ConfigTimer0() { ClearPending(BIT_TIMER0); EnableIrq(BIT_TIMER0); rTCFG0 &= ~0x0000ff; rTCFG0 |= 0x0000f9; //prescaler = 249+1 rTCFG1 &= ~0x00000f; rTCFG1 |= 0x000002;//mux = 1/16 rTCNTB0 =12500*2; rTCON &= ~0x00001f; rTCON |= 0x00000f; rTCON &= ~0x000002; //clear manual update bit pISR_TIMER0=(U32)Timer0_ISR; } void Main(void) { char *mode; int i; static U8 key; static U32 mpll_val = 0 ; int SendDataSum=0; //U32 divn_upll = 0 ; U8 KeyNewStatue=FALSE; U8 KeyOldStatue=FALSE; //******************dont remove**********************// rDSC0 = 0x2aa; rDSC1 = 0x2aaaaaaa; //Enable NAND, USBD, PWM TImer, UART0,1 and GPIO clock, //the others must be enabled in OS!!! rCLKCON = 0xfffff0; MMU_Init(); //**************************************************// Port_Init(); i = 2 ; //don't use 100M! SetSysClock(i,&key,&mpll_val); //key= 14; mpll_val= (92<<12)|(1<<4)|(1); FLCK=400MHz //init FCLK=400M, so change MPLL first ChangeMPllValue((mpll_val>>12)&0xff, (mpll_val>>4)&0x3f, mpll_val&3);/// ChangeClockDivider(key, 12); //key=14, FCLK:HCLK:PCLK=1:4:8 //cal_cpu_bus_clk(); CalCpuBusClk(&FCLK, &HCLK ,&PCLK ,&UCLK,&cpu_freq,&UPLL) ; consoleNum = 0; // Uart 1 select for debug. Uart_Init( 0,115200 ); Uart_Select( consoleNum ); //ConfigTimer0(200); // Beep(2000, 100); //Buzzer_Freq_Set(200); /* rSRCPND = rSRCPND | (0x1<<14); rINTPND = rINTPND | (0x1<<14); rINTMSK = ~(0x1<<14); //打开定时器4中断 */ // ConfigTimer4(); ConfigTimer0(); config_GPB5678_output(); Uart_Printf("\nFCLK is %10d,HCLK is %10d,PCLK is %d,UCLK is %d",FCLK,HCLK,PCLK,UCLK); while(1) { set_pin_GPB(GPB_PIN6|GPB_PIN7|GPB_PIN8); Delay(500); clr_pin_GPB(GPB_PIN6|GPB_PIN7|GPB_PIN8); Delay(500); // Uart_Printf("\n%d", rTCNTO0&0xffff); } } void Isr_Init(void) { /* pISR_UNDEF=(unsigned)HaltUndef; pISR_SWI =(unsigned)HaltSwi; pISR_PABORT=(unsigned)HaltPabort; pISR_DABORT=(unsigned)HaltDabort; */ rINTMOD=0x0; // All=IRQ mode rINTMSK=BIT_ALLMSK; // All interrupt is masked. }