Posted on May 29, 2011 at 12:41Hi, 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
