• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 82 subscribers
  • Views 148 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TMS320F28379D: Count number of index pulses from CLA

TMS320F28379D: comparing the index event which is run from cpu vs CLA

Arun Kumar
Expert 1030 points
Part Number: TMS320F28379D

Hi Ryan,

A followup question

If we set up an qep interrupt from the cpu: 

Fullscreen
1
2
EQEP_enableInterrupt(M1_QEP_BASE, EQEP_INT_UNIT_TIME_OUT | EQEP_INT_OVERFLOW | EQEP_INT_UNDERFLOW | EQEP_INT_INDEX_EVNT_LATCH);
Interrupt_register(M1_QEP_BASE, &M1_eQEP_ISR);
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

This is my isr

Fullscreen
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
__interrupt void M1_eQEP_ISR(void)
{
if((EQEP_getInterruptStatus(M1_QEP_BASE) & EQEP_INT_INDEX_EVNT_LATCH) != 0)
{
//index event has occurred
indexEventCountCPU_qep[0]++;
EQEP_clearInterruptStatus(M1_QEP_BASE,(EQEP_INT_INDEX_EVNT_LATCH | EQEP_INT_GLOBAL));
}
if((EQEP_getInterruptStatus(M1_QEP_BASE) & EQEP_INT_UNIT_TIME_OUT) != 0)
{
//UTO timeout has occurred
;
EQEP_clearInterruptStatus(M1_QEP_BASE,(EQEP_INT_UNIT_TIME_OUT | EQEP_INT_GLOBAL));
}
if((EQEP_getInterruptStatus(M1_QEP_BASE) & EQEP_INT_UNDERFLOW) != 0)
{
//position counter underflow event has occurred
pcuEventCountCPU_qep[0]++;
EQEP_clearInterruptStatus(M1_QEP_BASE,(EQEP_INT_UNDERFLOW | EQEP_INT_GLOBAL));
}
if((EQEP_getInterruptStatus(M1_QEP_BASE) & EQEP_INT_OVERFLOW) != 0)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

And In one of my CLA tasks i already have somthing simillar running:

Fullscreen
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
if (fclVars[0].ptrQEP->QFLG.all & CLA_QEP_FLAG_IEL_EVENT)
{
indexCountCLA[0]++;
fclVars[0].ptrQEP->QCLR.bit.IEL = 1;
}
if (fclVars[0].ptrQEP->QFLG.all & CLA_QEP_FLAG_PCU_EVENT)
{
indexCountCLAUnderflowPCU[0]++;
//indexCountCLAOverflowPCO[0] = 0;
fclVars[0].ptrQEP->QCLR.bit.PCU = 1;
}
if (fclVars[0].ptrQEP->QFLG.all & CLA_QEP_FLAG_PCO_EVENT)
{
indexCountCLAOverflowPCO[0]++;
//indexCountCLAUnderflowPCU[0] = 0;
fclVars[0].ptrQEP->QCLR.bit.PCO = 1;
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Is it possible to run both these simultaniously for comparision? I want to compare the qep performance from cpu and cla at once, ideally there should be no difference but would like to validate this none the less.

  • 0
    TI__Mastermind 21746 points

    Hi AK,

    Here is how you can measure the duration of a CLA task. Also here is another thread for reference. From the CPU side, you can measure performance via the profile clock tool. Please refer to this link Then compare these together.

    Ideally there should not be much difference.

    Best,

    Ryan Ma

  • 0 in reply to Ryan Ma
    Expert 1030 points

    Hi Rayn, thanks for the reply, my doubt here is, can we access the same QEP module from the CPU and CLA simultanously?

    For example , here what happens if i clear the IEL interrupt from CPU and CLA,which one will take priority?

  • 0 in reply to Arun Kumar
    TI__Mastermind 21746 points

    What are the sources of the interrupts occurring from the CLA and CPU? Are they the same source? Ideally you only have either CPU or CLA assigned to what is generating the interrupt and clearing the interrupt to avoid these simultaneous flag clears.

    Best,

    Ryan Ma