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Job Shen
Job Shen
Associate III
December 12, 2017
Solved

How to use SD2 for Serial read/write on SPC570S-DISP

  • December 12, 2017
  • 1 reply
  • 1884 views
Posted on December 12, 2017 at 02:55

Hi,

I am using sample application for serial operation on SPC570S-DISP, from serial_lld.c, it looks like SD1 is mapped to LINFLEX0 and SD2 is mapped to LINFLEX1. I have no problem read/write SD1, however i need at least 2 serial port, one for console and one for API. But when i add a line of code 'sd_lld_start (&SD2, NULL); ' after the original 'sd_lld_start(&SD1, NULL);', the application stops working. Debug showing it is stuck in the first xTaskCreate (...) function call i had. If i comment out the sd_lld_start for SD2, then the xTaskCreate function call can complete and application works.

I wonder what i have missed.

I have set the SPC570Sxx Low Level Drivers Component RLA/LINFlex Settings/LINFLEX1 to Serial (default was None). I don't know if there is any other place i need to change.

Best Regards,

Job

#serial
    This topic has been closed for replies.
    Best answer by Job Shen
    Posted on December 14, 2017 at 01:22

    Hi Erwan,

    I read SD1 and SD2 from RP3 by connecting the GPIO pins, i finally made it work without using the RS232 to TTL converter module. I found read from SD2 is no difference compare to read from SD1, i don't know why a RS232 to TTL converter is needed.

    First i used pinmap editor to get the PIN name, MSCR index and function index, then i go to Board Initialization Component RLA under I/O Settings to add the entry using the PIN name, MSCR index and function index (SSS), i had no idea what MSCR and SSS is, so it took me awhile to assosicate them to the values pinmap editor properties. (i must admit it wasn't easy). I tested PIN 6 and PIN 48 for LINFLEX1 TX and both works, PIN 6 belongs to PA[8] and PIN48 belongs to PD[8].

    The SPC570S-DISP board has 4 x 37 I/O pin array, using the UM2025 Hardware overview, i tried to find the corresponding pin for PD[8] for my TX,

    i found B21 is connected to PD[8] and C19 also connected to PD[8]. I connected to B21 and i was able to received data, but C19 has no data. When i was trying to access LINFLEX0, i found A10 had no data and C11 has data despite both connected to PA[13].

    Look at below table from UM2025 Hardware overview, Page 18/24 and Page 19/24, does B21 and C19 both connected to PD[8] and should provide data?

    0690X00000609CeQAI.png0690X00000609E1QAI.png0690X000006099vQAA.png

    Best Regards,

    Job

    1 reply

    Erwan YVIN
    Erwan YVIN
    ST Employee
    December 12, 2017
    Posted on December 12, 2017 at 09:47

    Hello Job ,

    First , Did you enable LINFLEX1 Pins with the Pinmap Editor ?

    0690X00000609B2QAI.png

    You should go in CPU Windows with PLS and check the LR in assembler mode to check where the assert is generated.

              Best Regards

                              Erwan

    Job Shen
    Job ShenAuthor
    Associate III
    December 13, 2017
    Posted on December 13, 2017 at 01:49

    Hi Erwan,

    I didn't enable the LINFLEX1 with PinMap editor, thank you for pointing out that. Now that i have enabled it, the program can run, but i still not able to receive data on the LINFLEX1 TX pins when i wrote to SD2.

    According to the UM2025 User Manual, the LINFLEX1-TX is mapped to PD[8], however when i use the PinMap editor, it mapped to PA[8], see attached screen shot of the mouse tip text, I was able to go to I/O settings and change the MSCR Index from 8 to 56 to make it map to PD[8]. I used same advance setting of LINFLEX0, but still not able to receive data from B21 or C19.

    Anything i did wrong or overlooked?

    Best Regards,

    Job

    0690X00000609BqQAI.png0690X00000609C0QAI.png
    Erwan YVIN
    Erwan YVIN
    ST Employee
    December 13, 2017
    Posted on December 13, 2017 at 11:28

    Hello Job ,

    Did you try to read/write SD2 on RPI3 or PC ?

    if RPI3, if directly by GPIO, you need a module

    RS232 To TTL Converter Module Serial Module

    We have already used LINFLEX0 (Serial PC) and LINFLEX1 (Serial => BT Device)

    it works well.

    Best regards

    Erwan

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