STM32?????STM32???IIC????

 STM32????IIC???,????????????????

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?????????STM?????IIC??????,??????????????õô????????????§Ò????,??????????????????,

IIC???????§à???????,???????????????????????

1. CR1

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CR2

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1. ???????IIC?????????????

1. ????IO??,?????GPIO_Mode_AF_OD??

2. ???IIC??

3. ???????????????????õô???????

4. ????IIC????????????

2. ???IIC???§Õ???????????????????????,???????????ack??????????ACK,?????????????????????,?????????????????

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[cpp] view plain copyvoid HmcIICInit(void)

{

/*GPIO?????*/

GPIO_InitTypeDef GPIO_InitStructure;

/* ???????IIC???????? */

I2C_InitTypeDef I2C_InitStructure;

/* ????? I2C1 ?§Û????? */

RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOB,ENABLE );

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);

/* PB6-I2C1_SCL??PB7-I2C1_SDA*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

GPIO_Init(GPIOB, &GPIO_InitStructure);

/*IIC????????*/

/* I2C ???? */

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C ; //????????IIC??

//I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;

//I2C_InitStructure.I2C_OwnAddress1 = SlaveAddress;

I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; //?????????

I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_InitStructure.I2C_ClockSpeed = 50000; //5K??????

/* I2C1 ????? */

I2C_Init(I2C1, &I2C_InitStructure);

/* ??? I2C1 */

I2C_Cmd (I2C1,ENABLE);

/*?????????*/

I2C_AcknowledgeConfig(I2C1, ENABLE);

}

void HmcByteWrite(u8 addr,u8 dataValue)

{

I2C_GenerateSTART(I2C1,ENABLE);

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2C1,HMC_ADDR,I2C_Direction_Transmitter);

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(I2C1,addr);

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_SendData(I2C1,dataValue);

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTOP(I2C1,ENABLE);

}

u8 HmcByteRead(u8 addr)

{

u8 dataValue;

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY));

I2C_GenerateSTART(I2C1,ENABLE);//??????

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2C1,HMC_ADDR,I2C_Direction_Transmitter);//?????õô???+§Õ???

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//

I2C_Cmd(I2C1,ENABLE);

I2C_SendData(I2C1,addr);//????ݴ??????????0???

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTART(I2C1,ENABLE);//??????

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2C1,HMC_ADDR,I2C_Direction_Receiver);//?????õô???+?????

while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

I2C_AcknowledgeConfig(I2C1,DISABLE);

I2C_GenerateSTOP(I2C1,ENABLE);

while(!(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED)));

dataValue=I2C_ReceiveData(I2C1);//?????????????

return dataValue;

}

????admin  ?????????2018-05-18