Hello NXP,
I'm using AutoSar V4.4 MCAL, want to test I2C Over DMA using Tresos, I've configured an I2C channel as master, chose async mode as LPI2C_USING_DMA and referenced a DMA channel in both DMA RX Channel Ref and DMA TX Channel Ref.
I've also configured the referenced DMA channel as follows:
And the Global config as follows:
Now my question is, in my code, i have to do the following:
Mcu_Init& and the rest of Mcu_init sequence
Port_Init
Mcl_Init
I2C_init
and then for example, use /* Master send data */
I2c_AsyncTransmit(0U, &pRequestSend); to send data
is there anything else that I need to configure? for example the major loop & minor loop settings or are they auto configured and this example is ready to go?
Also, in case I want the master to receive data, how is that acheived over DMA, Do I need to fill a dma interrupt or something? Also can the same DMA channel be used for sending/Receiving?
Thanks.
Hi @AhmedAnwar ,
In your case, you need to create and assign DMA channel for Tx and Rx of both Master and Slave too
After that, in your Main application, you also need to enable ISR handler for DMA channels:
Platform_InstallIrqHandler(DMA0_IRQn, &Dma0_Ch0_IRQHandler, NULL_PTR);
Platform_InstallIrqHandler(DMA1_IRQn, &Dma0_Ch1_IRQHandler, NULL_PTR);
Platform_InstallIrqHandler(DMA2_IRQn, &Dma0_Ch2_IRQHandler, NULL_PTR);
Platform_InstallIrqHandler(DMA3_IRQn, &Dma0_Ch3_IRQHandler, NULL_PTR);
You can also add Interrupt Callback function to get notification when transmit is done:
For DMA0: FlexIO_I2c_Ip_DmaTransferCompleteNotificationShifter0
For DMA1: FlexIO_I2c_Ip_DmaTransferCompleteNotificationShifter1
For DMA2: FlexIO_I2c_Ip_DmaTransferCompleteNotificationShifter2
For DMA3: FlexIO_I2c_Ip_DmaTransferCompleteNotificationShifter3
For your 2nd question: If you want to sent data from Slave to Master, you should create a "receive request", which can be refer from pRequestSend in example.
Remember that 'DataDirection' and 'DataBuffer' should be changed to Receive and receive buffer. For more information, you can check my attached example file. This example is modified by S32DS to config S32K144 using FlexIO and I2C0 channel to send and receive data for both Master and Slave
