STM32通过I2C读写EEPROM的程序

/*I2C³õÊ¼»¯º¯Êý*/
void i2c_init()
{
I2C_InitTypeDef I2C_Struct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
I2C_Struct.I2C_ClockSpeed=200000;
I2C_Struct.I2C_Mode=I2C_Mode_I2C ;
I2C_Struct.I2C_DutyCycle=I2C_DutyCycle_2;
I2C_Struct.I2C_Ack=I2C_Ack_Enable;
I2C_Struct.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit ;
I2C_Init ( I2C1, &I2C_Struct);
I2C_Cmd(I2C1,ENABLE);
}
/*GPIOB³õÊ¼»¯º¯Êý*/
void gpio_init()
{
GPIO_InitTypeDef GPIO_Struct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_Struct.GPIO_Pin=GPIO_Pin_6|GPIO_Pin_7;
GPIO_Struct.GPIO_Mode=GPIO_Mode_AF_OD;
GPIO_Struct.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_Struct);
GPIO_Struct.GPIO_Pin=GPIO_Pin_9;
GPIO_Struct.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_Struct.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_Struct);
}
/*µÈ´ýEEPROM¿ÕÏÐ×´Ì¬*/
void I2C_WaitEepromStandbyState(u8 id)
{
vu16 SR1_Tmp = 0;
do
{
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Read I2C1 SR1 register */
SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, id, I2C_Direction_Transmitter);
}while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002)); //estimate the value of ADDR
/* Clear AF flag */
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
}
/*ÏòÖ¸¶¨µØÖ·Ð´µ¥¸ö×Ö½Ú³ÌÐò*/
void i2c_write(u8 id,u8 address,u8 byte)
{
I2C_WaitEepromStandbyState(id);
I2C_GenerateSTART ( I2C1, ENABLE);//·¢ËÍÆðÊ¼ÐÅºÅ
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT)); //ev5
I2C_Send7bitAddress ( I2C1,id, I2C_Direction_Transmitter); //·¢ËÍÆ÷¼þµØÖ·
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED )); //ev6
I2C_SendData ( I2C1, address);//·¢ËÍÊý¾ÝÔÚ´æ´¢Æ÷ÖÐµÄµØÖ·
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //ev8
I2C_SendData ( I2C1, byte);//·¢ËÍÊý¾Ý
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //ev8_2
I2C_GenerateSTOP(I2C1, ENABLE);//·¢ËÍÍ£Ö¹ÐÅºÅ
}
/*´ÓÖ¸¶¨µØÖ·¶Áµ¥¸ö×Ö½Ú³ÌÐò*/
u8 i2c_read(u8 id,u8 address)
{
u8 temp;
I2C_WaitEepromStandbyState(id);
I2C_GenerateSTART(I2C1, ENABLE);//·¢Æô¶¯ÐÅºÅ
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT));//EV5
I2C_Send7bitAddress ( I2C1,id, I2C_Direction_Transmitter);//·¢ËÍÆ÷¼þµØÖ·
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//EV6
I2C_SendData ( I2C1, address);//·¢ËÍÊý¾ÝÔÚ´æ´¢Æ÷ÖÐµØÖ·
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));//EV8
I2C_GenerateSTART(I2C1, ENABLE); //ÖØÐÂ·¢ËÍ¿ªÊ¼ÐÅºÅ
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT)); //ev5
I2C_AcknowledgeConfig(I2C1, DISABLE); //¹Ø±ÕÓ¦´ð¹¦ÄÜ
I2C_Send7bitAddress ( I2C1,id, I2C_Direction_Receiver);//ÖØÐÂ·¢ËÍÆ÷¼þµØÖ·
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)); //ev6
temp=I2C_ReceiveData(I2C1);//½ÓÊÕÊý¾Ý
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED)); //ev7
I2C_GenerateSTOP(I2C1, ENABLE);//·¢ËÍÍ£Ö¹ÐÅºÅ
return temp;
}
int main(void)
{
i2c_init();
gpio_init();
i2c_write(0xa2,3,0xab);
data=i2c_read(0xa2,3);
if(data == 0xab)//¼ì²â¶Á³öÐ´ÈëÊÇ·ñÏàÍ¬
{
for(;;)//LEDÉÁË¸
{
Delay_MS(1000);
// GPIO_Write(GPIOB, 0x10);
GPIOB->ODR = 0x10;
GPIO_SetBits(GPIOB,GPIO_Pin_9);
// GPIO_Write(GPIOB, 0x00);
Delay_MS(1000);
GPIOB->ODR = 0x00;
GPIO_ResetBits(GPIOB,GPIO_Pin_9);
}
}
while(1);
}