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fix #355 possible infinite loop PCD_Reset()

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commited by @psgreco
This commit is contained in:
Rotzbua
2018-02-25 02:19:12 +01:00
parent b239257694
commit 5879252f82
1 changed files with 5 additions and 5 deletions
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10
src/MFRC522.cpp
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@@ -232,11 +232,11 @@ void MFRC522::PCD_Reset() {
// The datasheet does not mention how long the SoftRest command takes to complete. // 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) // 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 + 37,74μs. Let us be generous: 50ms. // Section 8.8.2 in the datasheet says the oscillator start-up time is the start up time of the crystal + 37,74μs. Let us be generous: 50ms.
delay(50); uint8_t count = 0;
// Wait for the PowerDown bit in CommandReg to be cleared do {
while (PCD_ReadRegister(CommandReg) & (1<<4)) { // Wait for the PowerDown bit in CommandReg to be cleared (max 3x50ms)
// PCD still restarting - unlikely after waiting 50ms, but better safe than sorry. delay(50);
} } while ((PCD_ReadRegister(CommandReg) & (1 << 4)) && (++count) < 3);
} // End PCD_Reset() } // End PCD_Reset()
/** /**