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StdPepiph Library I2C

Question asked by 0x1b on Jan 26, 2017

Hi everyone,

I'm new in STM32 and try to run I2C but when I try to connect with other device program stay in endles loop

while (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);

 

What could be wrong ?

 

My code:

 

void init_I2C()
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;
   
   
    RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
   
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_I2C2);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_I2C2);

    GPIO_StructInit( &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    I2C_StructInit(&I2C_InitStructure);

    I2C_InitStructure.I2C_ClockSpeed = 50000;
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Disable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_Init(I2C2, &I2C_InitStructure);

    I2C_Cmd(I2C2, ENABLE);
}

void read_I2C()
{
    I2C_GenerateSTART(I2C2, ENABLE);
    while (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);
    I2C_Send7bitAddress(I2C2, 0xa0, I2C_Direction_Receiver);
    while (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) != SUCCESS);
}

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