通過(guò)MSP430的IO口模擬I2C總線(xiàn)對(duì)AT24C25進(jìn)行讀寫(xiě)程序
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unsigned char EEPROM_ByteWrite(unsigned int addr,unsigned char data)
{
unsigned char Dev_addr; //設(shè)備地址
unsigned char AddrLow;
unsigned char AddrHigh;
AddrLow = (unsigned char)addr;
AddrHigh = (unsigned char)(addr>>8);
Dev_addr = 0xa0|(AddrHigh<<1);
i2c_start();
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrHigh);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrLow);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(data);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_stop();
i2c_delay_ms(10);
return 0;
}
unsigned char EEPROM_RandomRead(unsigned int addr)
{
unsigned char Dev_addr; //設(shè)備地址
unsigned char AddrLow;
unsigned char AddrHigh;
unsigned char tmp;
AddrLow = (unsigned char)addr;
AddrHigh = (unsigned char)(addr>>8);
Dev_addr = 0xa0|(AddrHigh<<1);
i2c_start();
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_delay_ms(5);
i2c_SendByte(AddrHigh);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrLow);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_delay_ms(5);
i2c_start();
Dev_addr = 0xa1|(AddrHigh<<1);
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
}
i2c_delay_ms(5);
tmp = i2c_RevByte();
i2c_SendNoAck();
i2c_stop();
i2c_delay(100);
return tmp;
}本文引用地址：http://www.biyoush.com/article/201611/322430.htm
unsigned int EEPROM_PageWrite(unsigned int page,unsigned char* p,unsigned char n)
{
unsigned char Dev_addr;
unsigned char AddrLow;
unsigned char AddrHigh;
unsigned int tmp;
if((n > 64)|(page > 512)) //根據(jù)讀寫(xiě)的設(shè)備而變更為適合的頁(yè)數(shù)和每頁(yè)字節(jié)數(shù)
{
return OutOfRang;
}
tmp = ((unsigned int)page) << 6; //得出頁(yè)首地址
AddrLow = (unsigned char)tmp;
AddrHigh = (unsigned char)(tmp>>8);
Dev_addr = 0xa0 | (AddrHigh << 1);
i2c_start();
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_delay_ms(5);
i2c_SendByte(AddrHigh);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrLow);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
while(n--)
{
i2c_SendByte(*p++);
if(i2c_check_ACK() == FALSE)
{
}
}
i2c_stop();
i2c_delay_ms(10);
return 0;
}
unsigned char EEPROM_SequentialRead(unsigned int addr,unsigned int n,unsigned char* p)
{
unsigned char Dev_addr; //設(shè)備地址
unsigned char AddrLow;
unsigned char AddrHigh;
if(n > (32768 - addr)) //檢查預(yù)寫(xiě)入地址是否有效
{
return OutOfAddr;
}
AddrLow = (unsigned char)addr;
AddrHigh = (unsigned char)(addr>>8);
Dev_addr = 0xa0|(AddrHigh<<1);
i2c_start();
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_delay_ms(5);
i2c_SendByte(AddrHigh);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_SendByte(AddrLow);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
i2c_delay_ms(5);
i2c_start();
Dev_addr = 0xa1|(AddrHigh<<1);
i2c_SendByte(Dev_addr);
if(i2c_check_ACK() == FALSE)
{
return AckError;
}
while(n--)
{
*p = i2c_RevByte();
p++;
if(n)
i2c_SendAck();
else
i2c_SendNoAck();
}
i2c_stop();
return 0;
}
main()
{
//unsigned char tt,tt1;
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
DCOCTL = 0X73;
BCSCTL1= 0X87; // 設(shè)置時(shí)鐘頻率4.00MHz
P5DIR |=0X03;
P5OUT |=0X03;
//EEPROM_ByteWrite(0x0,12);
//tt=EEPROM_RandomRead(0x0);
//tt1=tt;
EEPROM_PageWrite(2,dat,14);
EEPROM_SequentialRead(128,14,x);
}
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