msp430讀寫24c512程序

*整體描述：MSP430F169單片機硬件IIC軟件,字節方式，主方式
* IIC接口：P3.3=SCL,P3.1=SDA;(開漏輸出)
* 相應寄存器：地址寄存器 I2COA 用于存放自身從地址(從方式時才有用)
* 地址寄存器 I2CSA 用于存放外圍的從機地址(主方式時才有用)
* 控制寄存器 U0CTL 硬件I2C的設置、使能、模式等。
發送控制寄存器 I2CTCTL
* 數據控制寄存器 I2CDCTL 指示I2C總線的狀態
*
* U0CTL -- RXDMAEN,TXDMAEN,I2C, XA, LISREN,SYNC,MST,I2CEN
* 0 0 1 0 0 1 1 1 (0x17)
* I2CTCTL --I2CWORD,I2CRM,I2CSSEL1,I2XSSEL0, I2CTRX,I2CSTB, I2CSTP, I2CSTT
* 0 1 1 0 * 0 * *
************************************************************/
#include
#include "fpgacode.h"

#define WR24C512
#define LED1_1 (0x20)
#define LED1_0 (0xdf)

#define SDA_1 P3OUT |= BIT1 //串行數據線，SDA = 1
#define SDA_0 P3OUT &=~ BIT1 //SDA = 0
#define SCL_1 P3OUT |= BIT3 //串行時鐘線，SCL = 1
#define SCL_0 P3OUT &=~ BIT3 //SCL = 0

#define SDADIR_IN P3DIR &=~ BIT1 //SDA,I/O口為輸入
#define SDADIR_OUT P3DIR |= BIT1 //I/0口為輸出
#define SDA_IN ((P3IN >> 1) & 0x01) //Read SDA

#define SCLDIR_IN P3DIR &=~ BIT3 //SCL,I/O口為輸入
#define SCLDIR_OUT P3DIR |= BIT3 //I/0口為輸出
#define SCL_IN ((P3IN >> 3) & 0x01) //Read SCL

#ifdef WR24C512
static int numi = 0; //Data Pointer
#else
static int numj = 0; //Data Pointer
#endif

#define I2CSLA 0x50

void I2c_Idle_Check(void)
{
while (I2CBUSY & I2CDCTL); // I2C ready? 在空閑狀態：0，空閑；1：忙
}

void DelayTime10us(unsigned char n)
{
unsigned char i;
while(n--) // 5 cycles
for(i=0;i<10;i++); // 8mhz 110:771 + 4 to while
}

void I2cBusSendByte(unsigned char c)
{
while((I2CIFG & TXRDYIFG) != TXRDYIFG); // 檢測發送準備
I2CDRB = c; // 寫發送寄存器
}

void I2C_Send(unsigned char ndatNum)
{
// 注意:通訊結束,I2CMST 自動清零,再次通訊必須重新置位
P3OUT = 0x00; // clear P3 output register
P3SEL = 0x0A; // P3.1=SDA, P3.3=SCL,Select I2C pins, Setup I2C module
U0CTL |= (I2C + SYNC); // select I2C mode;XA=0,7bit_addresing;
U0CTL &= ~I2CEN; // i2c功能使能無效
// I2CTCTL = I2CRM + I2CSSEL_2; // x(x>256)字節模式 ，new start測試使用

// 選擇方式 I2CRM=0，最終用戶使用
I2CTCTL = I2CSSEL_2;
I2CNDAT = 2 + ndatNum; // 最終用戶使用，2byte地址 + 128byte數據

I2CPSC = 2; // set scl
I2CIFG = 0;
I2CSA = 0x50; // Slave address of At24c512
U0CTL |= I2CEN; // enable I2C module, 7 bit addr, master mode 08-26
U0CTL |= MST;


while (I2CBUSY & I2CDCTL); // I2C ready? 在空閑狀態：0，空閑；1：忙
I2CTCTL |= I2CTRX + I2CSTT + I2CSTP ; // I2CRM =0,啟動總線,發送從器件地址
while((I2CIFG & NACKIFG) == 0x02); // ack 為低電平，等待地址應答位 ,判斷 無應答NACKIFG = 1
}

unsigned char I2cSendSubAddr(unsigned int suba,unsigned char ndatNum)
{
unsigned char Hi_suba,Lo_suba;

I2C_Send(ndatNum); // 啟動總線,等待地址應答位

Hi_suba = ( unsigned char )( suba >> 8 );
Lo_suba = ( unsigned char )( suba & 0x00ff );
I2cBusSendByte( Hi_suba ); //發送器件子地址
while((I2CIFG & 0x02) == NACKIFG ) // 等待數據的應答
{
I2CTCTL |= I2CSTP; // 無應答，結束總線
return(0);
}
I2cBusSendByte( Lo_suba ); //發送器件子地址
while((I2CIFG & 0x02 )==0x02 ) // 等待數據的應答
{
I2CTCTL |= I2CSTP; // 無應答，結束總線
return(0);
}
return(1);
}

unsigned char I2cSendStr(const unsigned char * ps,unsigned char num)
{
// unsigned char i;
unsigned char tempnum;
tempnum = num-1;
for(numi=0;numi {
I2cBusSendByte(*ps);
while((I2CIFG & 0x02) == NACKIFG) // 等待數據的應答
{
I2CTCTL |= I2CSTP; // 無應答，結束總線
return(0);
}
ps++;
}

// I2CTCTL |= I2CSTP; //I2CRM =1模式中，在發送最后一個數據之前將停止位置位，*特別注意，必須
I2cBusSendByte(*ps);
while((I2CIFG & 0x02) == NACKIFG) // 等待數據的應答
{
I2CTCTL |= I2CSTP; // 無應答，結束總線
return(0);
}
return(1);
}

//------------------寫at24c512----
void I2cWrAt24c512(void)
{
unsigned int j=0;
unsigned char m,n;
unsigned int tempAddr;

for (j = 0;j <462;j++) // page write
{
tempAddr = 128*j;
while (I2CBUSY & I2CDCTL); // I2C ready?
I2cSendSubAddr(tempAddr,0x80);
I2cSendStr(FPGACfg+tempAddr,0x80);
P4OUT ^= 0x80;
for (m=0;m<125;m++) {for (n=0;n<110;n++);}
P4OUT ^= 0x80;
}

tempAddr = 128*j;
while (I2CBUSY & I2CDCTL); // I2C ready?
I2cSendSubAddr(tempAddr,0x4f);
I2cSendStr(FPGACfg+tempAddr,0x4f);
P4OUT ^= 0x80;
for (m=0;m<125;m++) {for (n=0;n<110;n++);}
P4OUT ^= 0x80;
}




void I2cReceSubAddr(unsigned int suba) // test 09-25 讀之前先寫地址
{
unsigned char Hi_suba,Lo_suba;
P3OUT = 0x00; // clear P3 output register
P3SEL = 0x0A; // P3.1=SDA, P3.3=SCL,Select I2C pins, Setup I2C module
U0CTL |= I2C + SYNC; // select I2C mode;XA=0,7bit_addresing;
U0CTL &= ~I2CEN; // i2c功能使能無效
// I2CTCTL =I2CRM + I2CSSEL_2;//I2CRM = 1,自己設定字節個數

I2CTCTL =I2CSSEL_2; // I2CRM = 0,
I2CNDAT = 2; // I2CRM = 0,2byte地址 + 128byte數據,固定字節
I2CIFG = 0;
I2CPSC = 1; // set scl
// I2CSCLH = 0x02; // High period of SCL
//I2CSCLL = 0x02; // Low period of SCL
I2CSA = 0x50; // Slave address of At24c512
U0CTL |= I2CEN; // enable I2C module, 7 bit addr,master mode 08-26
U0CTL |= MST;


Hi_suba = ( unsigned char )( suba >> 8 );
Lo_suba = ( unsigned char )( suba & 0x00ff );

while (I2CBUSY & I2CDCTL); // I2C ready? 在空閑狀態：0，空閑；1：忙
I2CTCTL |= I2CTRX + I2CSTT + I2CSTP ;// I2CRM =0,啟動總線,發送從器件地址
while((I2CIFG & NACKIFG) == 0x02) // ack 為低電平，等待地址應答位 ,判斷無應答NACKIFG = 1
{
I2CTCTL |= I2CSTP; // 結束總線
}

I2cBusSendByte( Hi_suba ); //發送器件子地址
while((I2CIFG & NACKIFG) == 0x02) // ack 為低電平，等待地址應答位 ,判斷無應答NACKIFG = 1
{
I2CTCTL |= I2CSTP; // 結束總線
}
I2cBusSendByte( Lo_suba ); //發送器件子地址
while((I2CIFG & NACKIFG) == 0x02) // ack 為低電平，等待地址應答位 ,判斷無應答NACKIFG = 1
{
I2CTCTL |= I2CSTP; // 結束總線
}
DelayTime10us(250);
DelayTime10us(250);
DelayTime10us(250);
DelayTime10us(250);
}


void InitI2cRece(unsigned char num)
{
P3OUT = 0x00; // clear P3 output register
P3SEL = 0x0A; // P3.1=SDA, P3.3=SCL,Select I2C pins, Setup I2C module
U0CTL |= I2C + SYNC; // select I2C mode;XA=0,7bit_addresing;
U0CTL &= ~I2CEN; // i2c功能使能無效
// I2CTCTL = I2CRM + I2CSSEL_2;// I2CRM=1 x(x>256)字節模式

I2CTCTL =I2CSSEL_2; // I2CRM=0
I2CNDAT = num; // 1個字節
I2CPSC = 1; // set scl
//I2CSCLH = 0x01; // High period of SCL
//I2CSCLL = 0x01; // Low period of SCL
I2CIFG = 0;
I2CSA = 0x50; // Slave address of At24c512
I2CTCTL &= ~I2CTRX;
U0CTL |= I2CEN; // enable I2C module, 7 bit addr,master mode 08-26
}


unsigned char I2cReceSlaByte(void)
{
unsigned char ch;
DelayTime10us(15);
U0CTL |=MST; //主模式
while (I2CBUSY & I2CDCTL); // I2C ready? 在空閑狀態：0，空閑；1：忙
I2CTCTL |= I2CSTT + I2CSTP; // I2CRM =0; Receive, ST, SP (clears MST)
while((I2CIFG & RXRDYIFG) != RXRDYIFG);// 等待地址應答位 ,判斷
ch = I2CDRB;
return(ch);
}


void I2cReceSlaStr(unsigned char num)
{
unsigned char i;
DelayTime10us(15);
U0CTL |=MST; //主模式
while (I2CBUSY & I2CDCTL); // I2C ready? 在空閑狀態：0，空閑；1：忙
I2CTCTL |= I2CSTT + I2CSTP; // I2CRM =0; Receive, ST, SP (clears MST)
for (i=0;i
{
while((I2CIFG & RXRDYIFG) != RXRDYIFG);// 等待地址應答位 ,判斷
rxDataArray = I2CDRB;
}
}