K82 : cancel I2C transfer

EugeneHiihtaja — Thu, 13 Dec 2018 09:05:59 GMT

Hello !

I should be able to cancel any ongoing transaction for I2C Master and Slave interfaces.

In case of slave I'm using I2C_SlaveTransferAbort() what should cancel any read/write operation on I2C bus.

Is this OK ?

2. For I2C master I'm using freeRTOS wrappers and they dosn't have any API for aborting transfers.

Should I use I2C_MasterStop(I2C_Type *base) ?

I'm using interrupt driver I2C master and slave interfaces and nonblocking transfers. DMA is disabled.

Regards,

Eugene

Re: K82 : cancel I2C transfer

kerryzhou — Fri, 14 Dec 2018 09:32:31 GMT

Hi Eugene Hiihtaja,

1.In case of slave I'm using I2C_SlaveTransferAbort() what should cancel any read/write operation on I2C bus.

Answer:

You can check the I2C_SlaveTransferAbort function.

void I2C_SlaveTransferAbort(I2C_Type *base, i2c_slave_handle_t *handle)
{
    assert(handle);

    if (handle->isBusy)
    {
        /* Disable interrupts. */
        I2C_DisableInterrupts(base, kIrqFlags);

        /* Reset transfer info. */
        memset(&handle->transfer, 0, sizeof(handle->transfer));

        /* Reset the state to idle. */
        handle->isBusy = false;
    }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

It disable the interrupt, so if your slave is using the interrupt to receive and write the I2C data, of course this code can used to cancel the operation.

2. For I2C master I'm using freeRTOS wrappers and they dosn't have any API for aborting transfers.

Should I use I2C_MasterStop(I2C_Type *base) ?

Answer:About the master, you can use I2C_MasterTransferAbort to stop the sending, I2C_MasterStop just send the STOP signal to the I2C bus.

Wish it helps you!

If you still have question about it, please kindly let me know.

Have a great day,
Kerry

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topic K82 : cancel I2C transfer in Kinetis Microcontrollers

K82 : cancel I2C transfer

Re: K82 : cancel I2C transfer