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I2C2 configuration

Question asked by carmi.gil on Mar 3, 2015
Latest reply on Mar 3, 2015 by carmi.gil

Hi I'm working on STM32F401,
            I'm trying to configure I2C2 port as an I2C Master,
            when i Generate START condition i don't get an interrupt. 

What I'm doing wrong?
              //Configure PB10 I2C2 Master, SCL pin PB3 I2C2 Master SDA pin
              GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_10;
              GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
              GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
              GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
              GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
              GPIO_Init(GPIOB, &GPIO_InitStructure);     // init GPIOB
              //Configure the NVIC for I2C2 MASTER   
              NVIC_InitStructure.NVIC_IRQChannel = I2C2_EV_IRQn;// Configure the I2C event priority
              NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
              NVIC_InitStructure.NVIC_IRQChannelSubPriority = 6;
              NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
              NVIC_InitStructure.NVIC_IRQChannel = I2C2_ER_IRQn;// Configure I2C error interrupt to have the higher priority
              NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 7;
              NVIC_InitStructure.NVIC_IRQChannelSubPriority = 7;
              NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
              NVIC_SetPriority(I2C2_EV_IRQn ,6 );//I2C2 MASTER
              NVIC_SetPriority(I2C2_ER_IRQn ,7 );//I2C2 MASTER  
              I2C_InitTypeDef I2C_InitStruct;
              // enable APB1 peripheral clock for I2C2
              RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
              RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);/*SCL GPIO clock enable */
              RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);/* Reset I2Cx IP */
              // Connect I2C2 pins to AF  
              GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF9_I2C2);       // SCL
              GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_I2C2);      // SDA
              // configure I2C2 
              I2C_InitStruct.I2C_ClockSpeed = 400000;           // 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(I2C2, &I2C_InitStruct);                    // init I2C3
              // enable I2C2
              I2C_Cmd(I2C2, ENABLE);
                I2C_ITConfig(I2C2, (I2C_IT_EVT | I2C_IT_BUF), ENABLE);// Enable Event Interrupts
                I2C_AcknowledgeConfig(I2C2, ENABLE);// Enable Acknowledge
                I2C_GenerateSTART(I2C2, ENABLE);// Generate the Start condition