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MSP432P401R: IAR/MSP432P401R: snprintf make error

Phuong Hoang
Prodigy 170 points

Part Number: MSP432P401R

Hi all,

Im have a problem with snprintf fucition, after call snprintf() to write string to buffer, it changed some my variable.

Berfore

After

Any help will be appreciated. Thank you!

lenbufferpasscode = 267

static char Bufferpasscodeesp[300+1] = {0};

lenbufferpasscode = snprintf(Bufferpasscodeesp,300,",\"Passcode\":[{\"Code\":%d,\"Time\":%d,\"Opt\": %d ,\"Nuser\":%d},{\"Code\":%d,\"Time\":%d,\"Opt\": %d ,\"Nuser\":%d},{\"Code\":%d,\"Time\":%d,\"Opt\": %d ,\"Nuser\":%d},{\"Code\":%d,\"Time\":%d,\"Opt\": %d ,\"Nuser\":%d},{\"Code\":%d,\"Time\":%d,\"Opt\": %d ,\"Nuser\":%d}]",
    Passcodenumber1.Codenumber,Passcodenumber1.Timenumber,Passcodenumber1.Optionnumber,Passcodenumber1.Usenumber,
    Passcodenumber2.Codenumber,Passcodenumber2.Timenumber,Passcodenumber2.Optionnumber,Passcodenumber2.Usenumber,
    Passcodenumber3.Codenumber,Passcodenumber3.Timenumber,Passcodenumber3.Optionnumber,Passcodenumber3.Usenumber,
    Passcodenumber4.Codenumber,Passcodenumber4.Timenumber,Passcodenumber4.Optionnumber,Passcodenumber4.Usenumber,
    Passcodenumber5.Codenumber,Passcodenumber5.Timenumber,Passcodenumber5.Optionnumber,Passcodenumber5.Usenumber);

  • 0
    TI__Guru 73941 points
    In the screen captures the lenbufferpasscode is 0 (before and after) but in the text of the post it says 267. Can you explain what is happening? Is the 267 expected but the snprintf is returning '0'?

    Have you looked into your SRAM usage and or tried using a smaller array size to see if the issue goes away?

    Chris
  • 0 in reply to Chris Sterzik
    Prodigy 170 points

    Hi Chris,

    I mean, after use snprintf fuction, some variable has been changed, the screen captures just show the change.

    The following code also changes the variable

    snprintf(BufferMinutesEnter,3,"%02d",ListUsersLatest[i].minutes);

    267 is the return value, it < 300, I think it is not an overflow buffer.

    I try replace the snprintf by another fuction. Do you have any comments?

    Phuong

  • 0 in reply to Phuong Hoang
    TI__Guru 73941 points
    No I do not have any comments. I would recommend inquiring with IAR support.

    Regards,
    Chris

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