Discovery loop keeps halting

jacobi — Thu, 23 Aug 2018 04:58:03 GMT

I am running a discovery loop using the NFC reader library on an IMX7 processor. For some strange reason the loop is halting. I don't know why.

Here is my code:

bool result = false;

phStatus_t status = PHAC_DISCLOOP_LPCD_NO_TECH_DETECTED;

// Set Poll Configuration
result = (phacDiscLoop_SetConfig(m_pDiscLoop, PHAC_DISCLOOP_CONFIG_PAS_POLL_TECH_CFG,
PHAC_DISCLOOP_POS_BIT_MASK_A | PHAC_DISCLOOP_POS_BIT_MASK_B)) == PH_ERR_SUCCESS);

uint16_t stopped = 0;

do
{
// Set Discovery Poll State to Detection
result = result && (phacDiscLoop_SetConfig(m_pDiscLoop,
PHAC_DISCLOOP_CONFIG_NEXT_POLL_STATE,
PHAC_DISCLOOP_POLL_STATE_DETECTION) == PH_ERR_SUCCESS);

std::cout << "discovery loop" << std::endl;

// Start discovery loop
status = phacDiscLoop_Run(m_pDiscLoop, PHAC_DISCLOOP_ENTRY_POINT_POLL);

//Check if loop was stopped
result = result && (phacDiscLoop_GetConfig(m_pDiscLoop,
PHAC_DISCLOOP_CONFIG_STOP_DETECTION_LOOP,
&stopped) == PH_ERR_SUCCESS);

std::cout << "discovery loop 2" << std::endl;

} while (((status & PH_ERR_MASK) == PHAC_DISCLOOP_NO_TECH_DETECTED) && result && !stopped);

if (stopped)
{
// Reset the stop detector
phacDiscLoop_SetConfig(m_pDiscLoop, PHAC_DISCLOOP_CONFIG_STOP_DETECTION_LOOP, 0);
}

I put some debug statements in to help me understand where things were going wrong. I found that the phacDiscLoop_Run doesn't return after some time, and therefore I never exit the do...while loop.

What could be going wrong? I have implemented an IRQ polling in another thread.

Could it be some synchronisation or resource problem?

Re: Discovery loop keeps halting

jimmychan — Thu, 30 Aug 2018 09:09:50 GMT

you may try to add a timer in the do while loop.

Re: Discovery loop keeps halting

christianhack — Fri, 14 Sep 2018 04:22:11 GMT

I don't think you can see this as it's not approved yet - so wait a few days. We had a problem like this and found some fairly significant issues in the Linux abstraction layer if you're using that.

https://community.nxp.com/thread/484506

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Discovery loop keeps halting

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