MPC5744p S32DS LINBUS master slave example

[akovacevic]

Hello everyone,

Could someone help me with information about whether there is an MPC5744p LINBUS Master/Slave example for S32 Design Studio?

Thank you!

[PetrS]

Hi,

there are LIN master and slave examples within S32DS, so you can refer to it.

PetrS_0-1692959754415.png

BR, Petr

[akovacevic]

What is the best approach here to use the SDK and LIN bus? I tried generating a LIN message with linflexd_uart, but generating that break and wakeup isn't possible. Should I use TX as a digital output?

[PetrS]

Hi,

as far as I know there's no LIN support in the SDK and there are no plans to add it.

BR, Petr

[akovacevic]

The attached ZIP contains the modified driver files 

Tested configuration:
- MPC5744P
- S32 Design Studio for Power Architecture 2.1
- S32_SDK_S32PA_RTM_3.0.3
- INST_LINFLEXD_UART2
- FreeRTOS
- Two physical slave controllers

Implemented functionality:
- LIN break and 0x55 synchronization byte
- Protected identifier generation and validation
- Master header transmission
- Interrupt-driven slave response
- Classic and enhanced checksum
- Frames with up to 8 data bytes
- Response timeout handling
- Recovery after a slave is disconnected, reset or reconnected
- Polling of multiple slave identifiers

The driver was tested with two physical MPC5744P slave controllers.

Installation:
1. Back up the original SDK driver files.
2. Copy the provided header to:
platform/drivers/inc/
3. Copy the provided source file to:
platform/drivers/src/linflexd/
4. Refresh the linked SDK files in the project.
5. Perform a clean rebuild.

I hope this helps anyone who needs basic LIN communication with the S32 SDK.
Feedback and test results on other MPC5xxx devices are welcome.

Best regards

[akovacevic]

My idea is to stay in the SDK environment, which is now, in your opinion, the best way to enable LIN hardware? Or is there maybe a way to create software via PIT and GPIO?

[PetrS]

Hi,

you can stay with SDK and LINFlex module, but you need to write code/driver yourself, for example reusing available baremetal code. 

BR, Petr

[akovacevic]

here is a way that works and simulates a wakeup signal

#define SYNC 0x55

#define WAKEUP = 0x00;

   ....

    LINFLEXD_UART_DRV_SetBaudRate(INST_LINFLEXD_UART1,4800);

    LINFLEXD_UART_DRV_SendDataBlocking(INST_LINFLEXD_UART1, &WAKEUP, 1,100);

    LINFLEXD_UART_DRV_SetBaudRate(INST_LINFLEXD_UART1,9600);

    masterMessage.sync = SYNC;

    masterMessage.id = PID;

    masterMessage.data[0] = 0x00;

    masterMessage.data[1] = 0x00;

    masterMessage.chksum = linbus_calculate_checksum(masterMessage.data,2);

[akovacevic]

Thank you for quick replay, is it possible to integrate a part of the example (initialization and sending a LIN message) with, let's say, a FreeRTOS example from the SDK package without any major issues?