Content originally posted in LPCWare by sarangkalbande on Tue Aug 27 00:00:06 MST 2013
Hi,
I am working on lpc11u37 USB Virtual serial Project.
I got the project from LPCOpen and Its working fine it detects USB as com and echo the characters
Now the problem is,
while (1)
{
status=phpalI14443p3a_ActivateCard(&I14443p3a, NULL, 0x00, bUid, &bLength,
bSak, &bMoreCardsAvailable);
if (status != PH_ERR_SUCCESS)
{
Buzzer_Off();
}
else
{
status = phalMfc_Authenticate(&alMfc, BLOCK_AUTHENTICATE, PHHAL_HW_MFC_KEYA,
0, 0, bUid, bLength);
if (status != PH_ERR_SUCCESS)
{
Buzzer_Fail();
}
else
{
status = phalMfc_Read(&alMfc, 2, &CardDataBuffer[0]);
if (status != PH_ERR_SUCCESS)
{
Buzzer_Fail();
}
else
{
Buzzer_Pass();
UART_Send(&CardDataBuffer[0],0x10); //DATA SEND USING SERIAL
EchoCharacters(CardDataBuffer,16); //data send using USB
phpalI14443p3a_Sw_HaltA(&I14443p3a);
IsDataAvailable=0;
}
}
}
USB_Task();
}
Now,In the above program USB_Task() function should always be in the while(1) loop.
I have also my card detection logic which always fails at authentication if USB_TASK() Function is dere
But when I comment USB_Task() then everything works fine
what could be the problem..I have tried everything like changing current consumption value,end point polling
interval,disabling all the interrupts except USB then also I am facing the problem.
I think the problem is related to blocking or what?and how to solve the same
