飛凌ok6410定時器精確控制led

#define PCLK 66000000 //forS3C6410 66MHZ
// #define HCLK 133000000//forS3C6410 133MHZ 這一句沒用到，寫上可以。

#define rTCFG0 (*(volatile unsigned*)(0x7F006000))

#define rTCFG1 (*(volatileunsigned*)(0x7F006004))

#define rTCON (*(volatileunsigned*)(0x7F006008))

#define rTCNTB0 (*(volatileunsigned*)(0x7F00600C))

#define rTCMPB0 (*(volatileunsigned*)(0x7F006010))

#define rTCNTO0 (*(volatileunsigned*)(0x7F006014))

#define rTCNTB1 (*(volatileunsigned*)(0x7F006018))

#define rTCMPB1 (*(volatileunsigned*)(0x7F00601c))

#define rTCNTO1 (*(volatileunsigned*)(0x7F006020))

#define rTCNTB2 (*(volatileunsigned*)(0x7F006024))

#define rTCNTO2 (*(volatileunsigned*)(0x7F00602c))

#define rTCNTB3 (*(volatileunsigned*)(0x7F006030))

#define rTCNTO3 (*(volatileunsigned*)(0x7F006038))

#define rTCNTB4 (*(volatileunsigned*)(0x7F00603c))

#define rTCNTO4 (*(volatileunsigned*)(0x7F006040))

#definerTINT_CSTAT (*(volatileunsigned*)(0x7F006044))

void uDelay(intusec)

{

unsignedint val=(PCLK)/1000000-1; //val = 65

//configure prescalerand divider

rTCFG0&=~(0xff<<8); //0000_0000_1111_1111 TCFG0[15:8-7:0]

rTCFG0|=0<<8; //0000_0000_0000_0000 |0000_0000_1111_1111 prescalar0 = 255 timer0,timer1 的prescalar value= 255 timer2,3,4的prescalar1 value = 0

rTCFG1&=~(0xf<<8); // 0000_1111_1111 TCFG1 [7:0] =1111_1111 TCFG1[11:8] = 0000（select mux for timer2. divider value = 1 ）；

rTCFG1|=0<<8;

//compute :

//timerinput clock frequency = PCLK /({prescaler value + 1})/{divider value}

// timer2input clock frequency = 66M /(1)/(1)= 66M hz

//configure timercounter buffer and enable timer2

rTCNTB2=val;

rTCON&=~(0xf<<12); // 0000_1111_1111_1111

rTCON|=0xb<<12; // 1011_0000_0000_0000|0000_1111_1111_1111 = 1011_1111_1111_1111

rTCON&=~(2<<12); // 1101_1111_1111_1111&1011_1111_1111_1111 = 1001_1111_1111_1111

【// TCON(Timer control register)

//1001 ： 表示 ： auto-reload , starttimer2】

//TCON[15]=1 auto-reload

//TCON[14] Reserved bits

//TCON[13]=0 no operatin , =1,update TCNTB2 TCMPB2

//TCON[12]=0 stop , =1 ,start timer2

//rTCON&= 0x9fff;

while(usec--){

while(rTCNTO2 >= val>>1);

while(rTCNTO2 < val>>1);

};

}

void msDelay(inttime)

{

volatile unsigned int i,j;

for(i=0;i<2000000;i++)

for(j=0;j}

void GPIO_Init(void)

{

rGPMCON =0x11111;

rGPMPUD =0x00;

rGPMDAT =0X1F;

}

voidLedTest(void)

{

volatile unsigned int i ,j;

while(1)

{

for(i=0;i<4;i++)

{

rGPMDAT=~(1< for(j=0;j<1000;j++)

uDelay(1000);

}

}

}

void Main(void)

{

GPIO_Init();

LedTest();

}