I2c2 start bit generation fail in STM32F103RB

Posted on May 29, 2011 at 12:41

Hi, all

I2c2 start bit generation fail - after timeout of 10 ms I2C_FLAG_SB = RESET = 0 but I2c1 work well read and write. anyone can help ?

More details:

10k poll up on each pin.

Clock Speed - 50000.

I2c2 start bit generation fail - after timeout of 10 ms I2C_FLAG_SB = RESET = 0 but I2c1 work well read and write.

More details:

10k poll up on each pin.

Clock Speed - 50000.

my code:

/*******************************************************************************

* Function Name  : ISC_Config

* Description    : Configure the ISC interface

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void I2C_Config(void)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    I2C_InitTypeDef  I2C_InitStructure;

   /* Configure the SDA And the SCL line to alternate function Open Drain */

    I2C_DeInit(I2C1);

    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(I2C_PORT, &GPIO_InitStructure);

    /* Configure the I2C peripheral */

    I2C_SoftwareResetCmd(I2C1,ENABLE);

    I2C_SoftwareResetCmd(I2C1,DISABLE);

    I2C_Cmd(I2C1, DISABLE);

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;

    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;

    I2C_InitStructure.I2C_OwnAddress1 = I2C_SLAVEADDRESS;

    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

    I2C_InitStructure.I2C_ClockSpeed = I2C_CLOCKSPEED;

    I2C_Init(I2C1, &I2C_InitStructure);

    I2C_Cmd(I2C1, ENABLE);

    I2C_AcknowledgeConfig (I2C1, DISABLE);

    I2C_DeInit(I2C2);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_11;

    GPIO_Init(I2C_PORT, &GPIO_InitStructure);

    /* Configure the I2C peripheral */

    I2C_SoftwareResetCmd(I2C2,ENABLE);

    I2C_SoftwareResetCmd(I2C2,DISABLE);

    I2C_Cmd(I2C2, DISABLE);

    I2C_Init(I2C2, &I2C_InitStructure);

    I2C_Cmd(I2C2, ENABLE);

    I2C_AcknowledgeConfig (I2C2, DISABLE);

}

/*******************************************************************************

* Function Name  : GenerateStartCondition

* Description    : Generates the I2C start condition

* Input          : None

* Output         : None

* Return         : TRUE - Start condition generated successfuly. FALSE - otherwise

*******************************************************************************/

static BOOL GenerateStartCondition(void)

{

    BOOL bRes=FALSE;

    BOOL bStatusChangeTimeout=FALSE;

    I2C_GenerateSTART (I2C2, ENABLE);

    if (TriggerTimeoutCounter(I2C_STATUS_CHANGE_TIMEOUT_MSEC))

    {

        while ((I2C_GetFlagStatus (I2C2,I2C_FLAG_SB)== RESET) && !bStatusChangeTimeout)

        {

            if (IsTimeoutExpired())

                  bStatusChangeTimeout=TRUE;

        }

        if (!bStatusChangeTimeout)

            bRes=TRUE;

    }

    return bRes;

}

main()

{

        return GenerateStartCondition(); //it's return false

}

#i2c2-start-bit-generation-fail-in-stm32f103rb