PCD_Reset

[glararan]

I have ESP32. I can't read from module if I receive SMS on GSM module connected to ESP32. So I wrote after receive PCD_Init again but it freeze on while function in

void MFRC522::PCD_Reset() {
	PCD_WriteRegister(CommandReg, PCD_SoftReset);	// Issue the SoftReset command.
	// The datasheet does not mention how long the SoftRest command takes to complete.
	// But the MFRC522 might have been in soft power-down mode (triggered by bit 4 of CommandReg)
	// Section 8.8.2 in the datasheet says the oscillator start-up time is the start up time of the crystal + 37,74�s. Let us be generous: 50ms.
	delay(50);
	// Wait for the PowerDown bit in CommandReg to be cleared
	while (PCD_ReadRegister(CommandReg) & (1<<4)) {
		// PCD still restarting - unlikely after waiting 50ms, but better safe than sorry.
	}
} // End PCD_Reset()

If I replace while with repeat try I never again read from rfid module.

I replaced it with

uint8_t count = 0;
	do {
		// Wait for the PowerDown bit in CommandReg to be cleared (max 3x50ms)
		delay(50);
	} while ((PCD_ReadRegister(CommandReg) & (1 << 4)) && (++count) < 3);

Any idea what to do? Thanks