How to use LPI2C peripheral with DMA without enabling any interrupts?

rkhw — Mon, 13 Jul 2026 19:36:09 GMT

Hello,

I am working with an NXP S32K396 MCU and would like to perform an LPI2C master transaction using eDMA without enabling any interrupts. In my project, I am using the LPI2C1 peripheral.

I can successfully perform LPI2C read and write transactions using DMA when the following interrupts are enabled:

LPI2C1_IRQn
eDMA0_DMATTCD_CH16_CH17_IRQn

However, it appears that the RTD LPI2C DMA implementation depends on these interrupts.

In Lpi2c_Ip_MasterSendData(), the LPI2C master interrupts are always enabled by the driver:

In addition, the DMA TCDs configured for TX and RX by Lpi2c_Ip_MasterTxDmaConfig() and Lpi2c_Ip_MasterRxDmaConfig() always enable the DMA major-loop completion interrupt:

Lpi2c_DmaTransferList[9u].Param = DMA_IP_CH_SET_CONTROL_EN_MAJOR_INTERRUPT;

Lpi2c_DmaTransferList[9u].Value = 1U;

I also noticed that in other function - Lpi2c_Ip_MasterSendDataBlocking() does not appear to configure a DMA TCD for the LPI2C transfer.

I would like to perform the complete LPI2C transmit and receive transaction using DMA while keeping LPI2C1_IRQn disabled and the eDMA channel interrupt disabled.

If possible, could NXP provide an example for LPI2C master TX/RX using DMA with both LPI2C and DMA interrupts disabled?

MCU: NXPS32K396

RTD: 6.0.0

NXP Studio: 3.6.1

Any help would be greatly appreciated. Thanks a lot in advance!

If needed, I can attach my project.

Re: How to use LPI2C peripheral with DMA without enabling any interrupts?

Senlent — Tue, 14 Jul 2026 02:01:35 GMT

Hi@rkhw

From the current driver implementation, the “Lpi2c_Ip_MasterSendData()” depend on both LPI2C master interrupts and DMA major-loop completion interrupts for transfer completion and state handling.

Therefore, you cannot enable DMA without enabling interrupts. The RTD driver does not support this usage.

S32KのトピックHow to use LPI2C peripheral with DMA without enabling any interrupts?

How to use LPI2C peripheral with DMA without enabling any interrupts?

Re: How to use LPI2C peripheral with DMA without enabling any interrupts?