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RM46L852: RM46L852 : mibspi issue using multi format / CS

baptiste besson
Prodigy 150 points
Part Number: RM46L852

Hi,

I am trying to control 2 slaves using CS0 and CS1 of MibSPI5.

Slave 1 connected to CS0 is using format0 with a 500kHz bauderate

Slave 2 connected to CS1 is using format1 or format 2 with a 5MHz bauderate.

I have attached my settings file. In the setup file, the groups 0, 1 and 2 are disable and I enable group 0 for Slave 1 (or group 1 for Slave 2) before starting using Slave 1 or 2.

When I use only Slave 2, It works fine.

When I use only Slave 1, the frequency of the clock is not 5kHz but 5MHz ie format 1 (or 2) bauderate. 

In my setup file, I found out that when I force the transfer group 1 and 2 length to 0, the frequency of Slave 1 is 5kHz and Slave 1 works fine (of couse this is a test a Slave 2 cannot be used anymore).

I don't understand as group 1 and 2 are disable and group 0 is enable why when I trigger my trigger source (HET1_14), frequency is not correct.

Thank you for you help

Baptiste

5773.RM46L852_mibspi_with_diff_formats.txt

 

  • 0
    TI__Guru**** 192716 points
    Hi Baptiste,

    I will investigate and come back to you soon.
  • 0 in reply to QJ Wang
    Prodigy 150 points
    Hi,

    Any idea ?

    Baptiste
  • 0 in reply to baptiste besson
    TI__Guru**** 192716 points
    Hi Baptiste,

    Please try this change: disable the CSHOLD for group 1 and group 2.
  • 0 in reply to QJ Wang
    Prodigy 150 points

    Hi,

    It doesn't change anything with CSHOLD disable. I still get 5MHz frequency for group0 instead of 500kHz.

    This is very

    - Group0 is using Format 0 and CS0 with 1 data (8bits), 5kHz

    - Group1 is using Format 1 and CS1 with 85 data (8bits), 5MHz

    - Group2 is using Format 2 and CS0 with 2 data (8bits), 5MHz

    When I send group1 data, format is correct --> send 85bytes at 5MHz using CS1 (I previously disabled group 0 and 2)

    When I send group2 data, format is correct  --> send 2bytes at 5MHz using CS1   (I previously disabled group 0 and 1)

    When I send group2 data, format is not correct --> send 1bytes (which is correct) using CS0 but frequency is 5MHz and not 5kHz  (I previously disabled group 1 and 2)

    Baptiste

  • 0 in reply to baptiste besson
    Prodigy 150 points

    Hi,

    I found out that the setupRAMBuffer resetted the buffer counter.
    I have updated the function and the problem is solved.

    Thank you anyway.

    Regards,

    Baptiste

  • 0 in reply to baptiste besson
    TI__Guru**** 192716 points

    Hi Baptiste,

    I did a test and works fine. Attached is my test case

    1. MibSPI5 is used

    2. CS0--TG0, length = 8; data format 0, 500kHz, triggered by Tick

    3. CS1--TG1, length = 8; data format 0, 1000kHz, triggered by Tick

    4. CS2--TG2, length = 8; data format 0, 5000kHz, triggered by Tick

    5. CS0--TG3, length = 8; data format 0, 500kHz, triggered by Tick

    2335.RM46L852PGE_MibSPI.7z