S32K118 FlexIO I2C with DMA

[seanwu]

Dear sir,

Now I am using FlexIO to be 2 I2C masters with DMA. I will reset I2C1 master(DMA channel is 2 and 3) if it is always BUSY. And then I will do FLEXIO_I2C1_DRV_MasterDeinit() and then  do FLEXIO_I2C1_DRV_MasterInit() to reset I2C1. Now I have a question is I should reset DMA(channel 2 and 3)? And if should, how to just reset DMA(channel 2 and 3)?

Thanks.

BR,

Sean Wu

[seanwu]

Dear sir,

I am using S32DS 3.5, and SDK is S32K118 SDK 4.0.1.

Thanks.

BR,

Sean Wu

[danielmartynek]

Dear Sean Wu,

Why don't you use the FLEXIO_I2C_DRV_MasterTransferAbort()?

It also disables the DMA in FLEXIO_I2C_DRV_MasterEndTransfer().

Regards,

Daniel

[seanwu]

Dear sir,

Thanks for your reply. Below are my steps to reset I2C1 when always busy. And you said DMA is disabled in FLEXIO_I2C_DRV_MasterTransferAbort(), and after reset I2C1, I should init DMA again?

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// FLEXIO_I2C_DRV_MasterTransferAbort(&i2cMasterState[0U]);

FLEXIO_I2C_DRV_MasterDeinit(&i2cMasterState[0U]);

FLEXIO_I2C_DRV_MasterInit(INST_FLEXIO_I2C_CONFIG_1, &Flexio_i2c_Config0, &i2cMasterState[0U]); //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Thanks.

BR,

Sean Wu.

[danielmartynek]

Dear @seanwu,

There is no need to deinit DMA.

And I think there is no need to deinit the FLEXIO_I2C_DRV_Master either if you use the FLEXIO_I2C_DRV_MasterTransferAbort() function.

Regards,

Daniel

[seanwu]

Dear sir,

So I just use FLEXIO_I2C_DRV_MasterTransferAbort() function to exit I2C Busy status?

I don't need to deinit/init DMA and FLEXIO_I2C_DRV_Master, right? And after FLEXIO_I2C_DRV_MasterTransferAbort() function, I can FLEXIO_I2C_DRV_MasterSendDataBlocking directly, right?

Thanks.

BR,

Sean Wu

[danielmartynek]

Hi @seanwu,

This should be enough to restore the S32K1xx I2C Master.

But it can be BUSY because the bus is held low by the Slave device.

Refer to UM10204 I2C-bus specification and user manual

Section 3.1.16 Bus clear

https://assets.nexperia.com/documents/user-manual/UM10204.pdf

SW for reference:

https://www.nxp.com/docs/en/application-note/AN4803.pdf

tI2C_fault I2C_Restore()

Regards,

Daniel

[danielmartynek]

Hello @seanwu,

What version of the drivers do you use?

Thank you,

BR, Daniel