Hi Andrew,
Sorry for the late reply. I am working on this issue that you are facing
I want to confirm the modification or the set up that you did.
For the PN170-Example, I have the following settings changed from the default state;
Could you please define the properties of the project?
However, I am running the same test and I reproduced the same issue that you are facing. I am checking this and I will get back to you as soon as possible.
Regards,
Mario
Hello Mario,
below is a screenshot of the Preprocessor-Settings I have been using as of late for the PN170-Example-Project
Besides the settings I had mentioned in my last post;
- I have removed DEBUG_SEMIHOSTING symbol since redirecting the Trace-Output to Serial/COM output allows the program to perform faster and with better success in communication
- I have defined the NO_NDEF_SUPPORT symbol, as I am only interested in performing Raw exchanges (Non-NDEF) of data between the PN170 and other NFC-Devices
But even with these symbols as defined, the issue as I'd reported still persists.
Below are some modifications I made to the code that seem help mitigate the issue, such that I do not
have to restart the PN170 in order to get NFC detection working again.
The gist of it is that I periodically restart the NCI-Discovery, based on the last time it was started/restarted which seems to reset the Pins/Ports back to a working state.
The only issue with this approach is that it seems to negatively affect the success rate of NFC communication in general, especially if I run it over shorter intervals.
Let me know if you are able to determine a more viable solution.
(/Application/nfc_task.c)
/* Callback function to restart NCI-Discovery */
void restartDiscovery(){
// We will restart discovery if it has not been restarted in the last 60 seconds
if (difftime(time(0), last_discovery_restart) > 60){
bool successStop = NxpNci_StopDiscovery();
bool successStart = NxpNci_StartDiscovery(DiscoveryTechnologies,sizeof(DiscoveryTechnologies));
/* Start Discovery */
if (successStart != NFC_SUCCESS) {
PRINTF("Error: cannot Restart discovery\n");
}
else {
last_discovery_restart = time(0);
}
}
}
/* Modification of existing task_nfc function */
void task_nfc(void){
...
int rw_interval = 1000; // Interval to periodically break from NxpNci_WaitForReception loop
/* Wait until a peer is discovered */
while(NxpNci_WaitForDiscoveryNotification(&RfInterface, restartDiscovery, rw_interval) != NFC_SUCCESS);
...
}
(/NfcLibrary/NxpNci/src/NxpNci.c)
/* Modification of existing NxpNci_WaitForDiscoveryNotification function */
bool NxpNci_WaitForDiscoveryNotification(NxpNci_RfIntf_t *pRfIntf, void (*rw_callback)(), int loopInterval){
...
do {
// We callback to restart discovery as needed
rw_callback();
// Set loopInterval to interval to periodically break from NxpNci_WaitForReception loop
if(NxpNci_WaitForReception(Answer, sizeof(Answer), &AnswerSize, loopInterval) == NXPNCI_ERROR) {
return NXPNCI_ERROR;
}
}
while ((Answer[0] != 0x61) || ((Answer[1] != 0x05) && (Answer[1] != 0x03)));
...
}
