Hello Freescale community,
I use Kinetis Design studio 2.0.0, MQX KSDK 1.0.0 with Processor expert, (uc MK64F),
I realized I2C communication using I2C0 as Master.
I talk with a eeprom in a Task every 50ms, when I want to talk with the Eeprom, if it is not present on the bus, I receive a NAK but the signal STOP is not send and the driver return : I2C_Fail
You can see the behavior in the following screenshot :
I use the function : i2c_status_t I2C_DRV_MasterReceiveDataBlocking
To solve the problem I add this condition (indicate in RED) in the function I2C_DRV_MasterReceiveDataBlocking :
************************************************************************************************************************************************************************************************************
/*FUNCTION**********************************************************************
*
* Function Name : I2C_DRV_MasterReceiveDataBlocking
* Description : Performs a blocking receive transaction on the I2C bus.
*
*END**************************************************************************/
i2c_status_t I2C_DRV_MasterReceiveDataBlocking(uint32_t instance,
const i2c_device_t * device,
uint8_t * cmdBuff,
uint32_t cmdSize,
uint8_t * rxBuff,
uint32_t rxSize,
uint32_t timeout_ms)
{
assert(instance < HW_I2C_INSTANCE_COUNT);
uint32_t baseAddr = g_i2cBaseAddr[instance];
uint32_t i = 0;
/* Get current runtime structure. */
i2c_master_state_t * master = (i2c_master_state_t *)g_i2cStatePtr[instance];
/* Return if there is already a trasction */
if (!master->i2cIdle)
{
return master->status = kStatus_I2C_Busy;
}
master->rxBuff = rxBuff;
master->rxSize = rxSize;
master->txBuff = NULL;
master->txSize = 0;
master->status = kStatus_I2C_Success;
I2C_DRV_MasterSetBaudRate(instance, device);
/* Set direction to send for sending of address. */
I2C_HAL_SetDirMode(baseAddr, kI2CSend);
/* Enable i2c interrupt.*/
I2C_HAL_ClearInt(baseAddr);
I2C_HAL_SetIntCmd(baseAddr, true);
/* Generate start signal. */
I2C_HAL_SendStart(baseAddr);
/* Send out slave address. */
I2C_DRV_SendAddress(instance, device, cmdBuff, cmdSize, kI2CReceive, timeout_ms);
/* Start to receive data. */
if (master->status == kStatus_I2C_Success)
{
/* Change direction to receive. */
I2C_HAL_SetDirMode(baseAddr, kI2CReceive);
/* Send NAK if only one byte to read. */
if (rxSize == 0x1U)
{
I2C_HAL_SendNak(baseAddr);
}
else
{
I2C_HAL_SendAck(baseAddr);
}
/* Dummy read to trigger receive of next byte in interrupt. */
I2C_HAL_ReadByte(baseAddr);
/* Wait for the transfer to finish.*/
I2C_DRV_MasterWait(instance, timeout_ms);
}
if(master->status == kStatus_I2C_ReceivedNak)
I2C_HAL_SendStop(baseAddr);
/* The stop signal is send inside irq before reading the last byte. */
/* Disable interrupt. */
I2C_HAL_SetIntCmd(baseAddr, false);
/* Indicate I2C bus is idle. */
master->i2cIdle = true;
/* Wait for the STOP signal finish. */
while(I2C_HAL_GetStatusFlag(baseAddr, kI2CBusBusy))
{
if(++i == 2)
{
/* Something is wrong becuase the bus is still busy. */
master->status = kStatus_I2C_Fail;
break;
}
else
{
OSA_TimeDelay(1U);
}
}
return master->status;
}
************************************************************************************************************************************************************************
It is normal to have to add this condition ?
