topic FlexIO configurate I2C when use DMA in Processor Expert Software

FlexIO configurate I2C when use DMA

qm1013 — Fri, 11 Sep 2020 06:39:01 GMT

hello, NXP:

when I use flexio which is configrated of DMA and I2C.

FLEXIO_I2C_DRV_MasterSendDataBlocking this function is always return with STATUS_I2C_RECEIVED_NACK.

when I use Oscilloscope test the I2C bus, the device address is send and receive OK , but the device address is sent twice.

However, when the FLEXIO i2c is set to interrupt mode , the communication is ok.

I don't know why. Could you give me some help?

Re: FlexIO configurate I2C when use DMA

qm1013 — Fri, 11 Sep 2020 06:43:21 GMT

Besides, the MCU is S32K144 , and the PA version is SDK_S32K1xx_15.

we used the flexio_i2c driver.

Re: FlexIO configurate I2C when use DMA

Alexis_A — Tue, 15 Sep 2020 22:41:23 GMT

Hello @qm1013 ,

Could you share the configurations used for the DMA channel?

Also, the new SDK release is the RTM 4.0.0 (using S32 Design Studio 3.3), this has a similar tool to processor expert called Config Tools that I will suggest to use.

Best Regards,

Alexis Andalon

Re: FlexIO configurate I2C when use DMA

Bosko100 — Tue, 03 Aug 2021 12:28:13 GMT

Hi Omar/NXP, I've the same issue. I'm working with S32K144 and SDK 3.0.2. I've configured flexio I2C with S32DS to work with DMA. When I use FLEXIO_I2C_DRV_MasterSendDataBlocking, sometimes device address is sent twice. This issue appear wit communication set to 400Kb. If I reduce communication speed to 100 Kb issue disappear. Is this expected due to DMA timing limitation? Is this issue fixed into SDK 4.0.0?