1、STM32 模擬 iic 驅動 eeprom24c128void IIC_Init(void)/IIC 初始化函數GPIO_InitTypeDefGPIO_InitStructure;RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOE,ENABLE);/使能GPIOB 時鐘GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; /推挽輸出GPIO_InitStructure.GPIO_Speed = GPIO_S

2、peed_50MHz;GPIO_Init(GPIOE, &GPIO_InitStructure);GPIO_SetBits(GPIOE,GPIO_Pin_2|GPIO_Pin_3);/PE2,PE3 輸出高void IIC_Start(void)/IIC 開始函數SDA_OUT(); /sda 線輸出IIC_SDA=1;IIC_SCL=1;delay_us(5);IIC_SDA=0;/START:when CLK is high,DATA change form high to lowdelay_us(5);IIC_SCL=0; /鉗住I2C 總線，準備發送或接收數據void IIC_

3、Stop(void) /IIC 停止函數SDA_OUT();/sda 線輸出IIC_SCL=0;IIC_SDA=0; /STOP:when CLK is high DATA change form low to highdelay_us(5);IIC_SCL=1;IIC_SDA=1;/ /發送I2C 總線結束信號delay_us(5);u8 IIC_Wait_Ack(void)/等待應答u8 ucErrTime=0;SDA_IN(); /SDA 設置為輸入IIC_SDA=1;delay_us(5);delay_us(1);while(READ_SDA)ucErrTime+;if(ucErrTi

4、me>250)IIC_Stop();return 1;IIC_SCL=0;/時鐘輸出 0return 0;void IIC_Ack(void) /SDA 輸出低電平，IIC 應答IIC_SCL=0;SDA_OUT();IIC_SDA=0;delay_us(2);IIC_SCL=1;delay_us(4);/SDA 輸出高電平,IIC 非應答void IIC_NAck(void)IIC_SCL=0;SDA_OUT();IIC_SDA=1;delay_us(2);IIC_SCL=1;delay_us(4);IIC_SCL=0;void IIC_Send_Byte(u8 txd)/IIC 發送

5、一個字節u8 t;SDA_OUT();/數據線輸出模式IIC_SCL=0; /拉低時鐘開始數據傳輸for(t=0;t<8;t+)IIC_SDA=(txd&0x80)>>7;txd<<=1;delay_us(5);/對 TEA5767 這三個延時都是必須的delay_us(5);IIC_SCL=0;delay_us(5);u8 IIC_Read_Byte(unsigned char ack) /IIC 讀取一個字節unsigned char i,receive=0;SDA_IN(); /SDA 設置為輸入for(i=0;i<8;i+ )IIC_SCL=

6、0;delay_us(5);IIC_SCL=1;receive<<=1;if(READ_SDA)receive+;delay_us(5);if (!ack)IIC_NAck(); /發送 nACKelseIIC_Ack(); /發送ACKreturn receive;void AT24CXX_Init(void)/AT254C128 初始化IIC_Init();u8 AT24CXX_ReadOneByte(u16 ReadAddr) /AT24C128 讀取一個字節u8 temp=0;IIC_Start();IIC_Send_Byte(0XA0); /發送寫命令IIC_Wait_A

7、ck();IIC_Send_Byte(ReadAddr>>8); /發送高地址IIC_Wait_Ack();IIC_Send_Byte(ReadAddr%256);/發送低地址IIC_Wait_Ack();IIC_Start();IIC_Send_Byte(0XA1);/進入接收模式IIC_Wait_Ack();temp=IIC_Read_Byte(0);IIC_Stop(); /產生一個停止條件return temp;void AT24CXX_WriteOneByte(u16 WriteAddr,u8 DataToWrite) IIC_Start();IIC_Send_Byte(

8、0XA0); /發送寫命令IIC_Wait_Ack();IIC_Send_Byte(WriteAddr>>8); /發送高地址IIC_Wait_Ack();IIC_Send_Byte(WriteAddr%256);/發送低地址IIC_Wait_Ack();IIC_Send_Byte(DataToWrite);/發送字節IIC_Wait_Ack();IIC_Stop(); /產生一個停止條件delay_ms(20);u8 AT24CXX_Check(void)u8 temp;temp=AT24CXX_ReadOneByte(12333); /避免每次開機都寫AT24CXXif(temp=0X55)return 0;else排除第一次初始化的情況AT24CXX_WriteOneByte(12333,0X55);temp=AT24CXX_ReadOneByte(12333);if(temp=0X55)return 0;return 1;void AT24CXX_Read(u16 ReadAddr,u8 *pBuffer,u16NumToRead)while(NumToRead) *pBuffer+=AT24CXX_ReadOneByte(ReadAddr+);NumToRead-;void AT24C