自学教程：C++ I2C_Cmd函数代码示例

/**************************************************************************************************** * @fn      I2C_Master_Initialise *          Call this function to set up the I2C master to its initial standby state. *          Remember to enable interrupts from the main application after initializing the I2C. * * @param   none * * @return  none * ***************************************************************************************************/void I2C_Master_Initialise(void){    I2C_InitTypeDef   I2C_InitStructure;    /* Configure the I2C interface */    I2C_Cmd(I2C_SENSOR_BUS, ENABLE);    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;    I2C_InitStructure.I2C_OwnAddress1 = 0; //Don't care in master mode    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;    I2C_InitStructure.I2C_ClockSpeed = I2C_SENSOR_BUS_CLOCK;    I2C_Init(I2C_SENSOR_BUS, &I2C_InitStructure);    asyncXfer.i2c_txrx_status = I2C_TXRX_STATUS_PASSED;     //initialize last comm status    /* Note: I2C bus event and error interrupts are enabled when tx is started */}

/**  * @brief  Initializes the LM75_I2C.  * @param  None  * @retval None  */void LM75_Init(void){  LM75_LowLevel_Init();  /* I2C DeInit */  I2C_DeInit(LM75_I2C);  /* I2C configuration */  I2C_Init(LM75_I2C, LM75_I2C_SPEED, 0x00, I2C_Mode_SMBusHost,           I2C_DutyCycle_2, I2C_Ack_Enable, I2C_AcknowledgedAddress_7bit);  /*!< Enable SMBus Alert interrupt */  I2C_ITConfig(LM75_I2C, I2C_IT_ERR, ENABLE);  /*!< LM75_I2C Init */  I2C_Cmd(LM75_I2C, ENABLE);}

/* * 函数名：I2C_Mode_Config * 描述  ：I2C 工作模式配置 * 输入  ：无 * 输出  ：无 * 调用  ：内部调用 */static void I2C_Mode_Config(void){    /* Initialize the I2C1 according to the I2C_InitStructure members */    I2C_InitTypeDef I2C_InitStructure;    /* I2C 配置 */    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C ;    //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 = 350000;    /* I2C1 初始化 */    I2C_Init(I2C1, &I2C_InitStructure);    /* 使能 I2C1 */    I2C_Cmd(I2C1, ENABLE);    /*允许应答模式*/    I2C_AcknowledgeConfig(I2C1, ENABLE);}

//--------------------------------------------------------------// interne Funktion// Init der I2C-Schnittstelle//--------------------------------------------------------------void P_I2C3_InitI2C(void){  I2C_InitTypeDef  I2C_InitStructure;  // I2C-Konfiguration  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;  I2C_InitStructure.I2C_OwnAddress1 = 0x00;  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;  I2C_InitStructure.I2C_ClockSpeed = I2C3_CLOCK_FRQ;  // I2C enable  I2C_Cmd(I2C3, ENABLE);  // Init Struktur  I2C_Init(I2C3, &I2C_InitStructure);}

/* I2C Functions */u32 platform_i2c_setup( unsigned id, u32 speed ){	GPIO_InitTypeDef GPIO_InitStruct;	I2C_InitTypeDef I2C_InitStruct;		// enable APB1 peripheral clock for I2C1	RCC_APB1PeriphClockCmd(i2c_rcc[id], ENABLE);	// enable clock for SCL and SDA pins	RCC_AHB1PeriphClockCmd(i2c_port_rcc[id], ENABLE);		I2C_DeInit(i2c[id]);		/* setup SCL and SDA pins	 * You can connect I2C1 to two different	 * pairs of pins:	 * 1. SCL on PB6 and SDA on PB7 	 * 2. SCL on PB8 and SDA on PB9	 */	GPIO_InitStruct.GPIO_Pin = i2c_scl_pin[id] | i2c_sda_pin[id]; // pins to use	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;		 // set pins to alternate function	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;		// set GPIO speed	GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;		// set output to open drain --> the line has to be only pulled low, not driven high	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;		// enable pull up resistors	GPIO_Init(i2c_port[id], &GPIO_InitStruct);			// init GPIO		// Connect I2C1 pins to AF  	GPIO_PinAFConfig(i2c_port[id], i2c_scl_pinsource[id], i2c_af[id]);	// SCL	GPIO_PinAFConfig(i2c_port[id], i2c_sda_pinsource[id], i2c_af[id]); // SDA		// configure I2C1 	I2C_StructInit(&I2C_InitStruct);	I2C_InitStruct.I2C_ClockSpeed = speed; 		//set speed (100kHz or 400kHz)	I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;			// I2C mode	I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;	// 50% duty cycle --> standard	I2C_InitStruct.I2C_OwnAddress1 = 0x00;			// own address, not relevant in master mode	I2C_InitStruct.I2C_Ack = I2C_Ack_Disable;		// disable acknowledge when reading (can be changed later on)	I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; // set address length to 7 bit addresses	I2C_Init(i2c[id], &I2C_InitStruct);				// init I2C1		// enable I2C1	I2C_Cmd(i2c[id], ENABLE);	return speed;}

void i2cInit(I2C_TypeDef *I2C){    NVIC_InitTypeDef NVIC_InitStructure;    GPIO_InitTypeDef GPIO_InitStructure;    I2C_InitTypeDef I2C_InitStructure;    // Init pins    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;    GPIO_Init(GPIOB, &GPIO_InitStructure);    I2Cx = I2C;    // clock out stuff to make sure slaves arent stuck    i2cUnstick();    // Init I2C    I2C_DeInit(I2Cx);    I2C_StructInit(&I2C_InitStructure);    I2C_ITConfig(I2Cx, I2C_IT_EVT | I2C_IT_ERR, DISABLE);       //Enable EVT and ERR interrupts - they are enabled by the first request    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;    I2C_InitStructure.I2C_ClockSpeed = 400000;    I2C_Cmd(I2Cx, ENABLE);    I2C_Init(I2Cx, &I2C_InitStructure);    NVIC_PriorityGroupConfig(0x500);    // I2C ER Interrupt    NVIC_InitStructure.NVIC_IRQChannel = I2C2_ER_IRQn;    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    NVIC_Init(&NVIC_InitStructure);    // I2C EV Interrupt    NVIC_InitStructure.NVIC_IRQChannel = I2C2_EV_IRQn;    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;    NVIC_Init(&NVIC_InitStructure);}

	u8 Temp_Read(void)	{				 u8 MSB,LSB;		 		//等待I2C
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