Tool/software:
Hello,
I’m working on a project with the TMS320F280025 microcontroller, C2000 v5.0.00.00, and the Safety Diagnostic Library v4.01.00.
The system is based on two interrupts:
- Timer2 (with 500ms period): Inside the ISR, the CPUTIMER_TCR_TIF is cleared as required in the thread:
TMS320F280025: Spurious interrupts after HWBIST test - ADC (with 55µs period): On every occurrence of the ISR, an STL_HWBIST_runMicro is executed until the HWBIST test is completed. After that, the FLASH ECC test is executed for a certain number of cycles in order to run correctable and uncorrectable tests… Then the cycle restarts from the HWBIST test.
- There are no other interrupts interfering with normal operation, and the system schedules correctly.
I have noticed that sometimes the execution of timer2_ISR is delayed by a time equal to the number of ADC_ISR cycles during which the flash tests are executed. After that, it seems that the execution of STL_HWBIST_runMicro restores normal operation.
The problem does not seem to occur in two different cases, namely when:
- CPUTIMER_TCR_TIF is not cleared by timer2_ISR (and therefore without the HWBIST test, since that would imply spurious timer2 interrupts).
- The instructions related to IER, PIEIER12, and EINT/DINT are not executed inside the else statement of the ADC_ISR.
Thank you in advance for your support.
Here the code:
__interrupt void timer2_ISR(void)
{
// Some code...
// Clear the overflow flag — this is mandatory to avoid spurious interrupts
// after HWBIST micro-run execution.
CPUTimer_clearOverflowFlag(CPUTIMER2_BASE);
}
interrupt void ADC_ISR(void)
{
// Some code...
// Acknowledge interrupt group 1 to allow further interrupts from this group
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
if (condition == 1)
{
// Some code...
// Execute HWBIST micro-run
STL_HWBIST_runMicro();
// Some code...
}
else
{
uint16_t pieier_prev = HWREGH(PIECTRL_BASE + PIE_O_IER12);
// IER: disable all interrupt except for the group 12 and ERAD.
IER &= INTERRUPT_CPU_INT12 | INTERRUPT_CPU_RTOSINT;
// PIEIER12: disable all interrupt of group 12
// except the flash correctable error interrupt.
HWREGH(PIECTRL_BASE + PIE_O_IER12) &= PIE_IER12_INTX11;
// Enable interrupts.
EINT;
// Perform a flash selftest.
flash_selftest();
// Disable interrupts.
DINT;
// Restore interrupts registers.
HWREGH(PIECTRL_BASE + PIE_O_IER12) = pieier_prev;
}
}
