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S3C2440-IIC

作者：時間：2016-12-02 來源：網(wǎng)絡(luò)

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void __irq IIC_ISR(void){

rSRCPND |= 0x1＜＜27;

rINTPND |= 0x1＜＜27;

flag = 0;

}

void wrat24c02(unsigned char add,unsigned char word, U32 length){

int i;

flag = 1;

rIICDS = 0xa0; //dev add

rIICCON &= "(0x1＜＜4); //清中斷

rIICSTAT = 0xf0; //主發(fā)送模式，寫開始信號輸出，IIC Rx/Tx使能

//等待ACK，接收器在接受到8位數(shù)據(jù)后，在第9個時鐘周期，拉低SDA電平，然后會產(chǎn)生中斷

while(flag == 1)

delay(100);

flag = 1;

rIICDS = word; //word add 發(fā)送要寫入的數(shù)據(jù)的內(nèi)存其實地址

rIICCON &= "(0x1＜＜4);

while(flag)

delay(100); //注意要有delay

for(i = 0; i ＜ length; i++){

flag = 1;

rIICDS = iic_buffer[ i];

rIICCON &= "(0x1＜＜4);

while(flag)

delay(100);

}

rIICCON = 0xe0; //IIC應(yīng)答有效，IICCLK=fpclk/512,IIC接受發(fā)送中斷使能位

rIICSTAT = 0xd0; //主發(fā)送模式，rIICCON和rIICSTAT配置好，方便下次使用

}

void rdat24c02(unsigned char add, unsigned char word, U32 length){

int i;

char temp;

flag = 1;

rIICDS = add; //dev add

rIICCON &= "(0x1＜＜4);

rIICSTAT = 0xf0;

while(flag)

delay(100);

flag = 1;

rIICDS = word; //word add

rIICCON &= "(0x1＜＜4);

while(flag)

delay(100);

flag = 1;

//這里的IIC的隨機讀操作，根據(jù)IIC的隨機讀時序，先發(fā)啟動，要讀取的設(shè)備地址和寫的內(nèi)存地址，方向是寫,即0，重啟IIC，

//發(fā)要讀取的設(shè)備地址，這次方向是讀，然后接到ACK，從機向主機發(fā)data，主機相應(yīng)ACK，直到最后一個data，主機不相應(yīng)ACK，

//發(fā)送停止信號

rIICDS = add; //dev add

rIICSTAT = 0xb0; //改變方向為主接收

rIICCON &= "(0x1＜＜4);

while(flag)

delay(100);

flag = 1;

temp = rIICDS;

rIICCON &= "(0x1＜＜4);

while(flag)

delay(100);

for(i = 0; i ＜ length; i++){

flag = 1;

if(i == (length - 1)){

rIICCON &= "(0x1＜＜7);

}

iic_buffer[ i] = rIICDS;

rIICCON &= "(0x1＜＜4);

while(flag)

delay(100);

}

rIICCON = 0xd0;

rIICSTAT = 0x90;

delay(200);

}

int Main(){

int i;

count= 0;

length = 0;

cmd = 0;

command = 0;

rGPECON = 0xa0000000; //GPE15～14 IICSDA，IICSCL

rGPEUP = 0xc000;

rIICCON = 0xe0; //IIC應(yīng)答有效，IICCLK=fpclk/512,IIC接受發(fā)送中斷使能位

rIICSTAT = 0x10; //IIC總線有效Rx/Tx

rULCON0 = 0x3;

rUCON0 = (1＜＜11)|(1＜＜2)|(1＜＜0);

rUBRDIV0 = 26;

rSRCPND = (0x1＜＜28)|(0x1＜＜27);

rINTPND = (0x1＜＜28)|(0x1＜＜27);

rSUBSRCPND = 0x1＜＜0;

rINTMSK &= "((0x1＜＜28)|(0x1＜＜27));

rINTSUBMSK &= "(0x1＜＜0);

pISR_UART0 = (U32)UART0_ISR;

pISR_IIC = (U32)IIC_ISR;

for(i = 0; i ＜ 8; i++){

iic_buffer[ i] = 0xee;

}

while(1){

switch(cmd){

case 0x01:

cmd = 0;

wrat24c02(add, word, length);

break;

case 0x02:

cmd = 0;

rdat24c02(add, word, length);

for(i = 0; i ＜ 8; i++){

while(!(rUTRSTAT0&0x4));

rUTXH0 = iic_buffer[ i];

}

break;

}

return 0;

}

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