From aef891541ac7f5406c227997621fbd100a6e20dc Mon Sep 17 00:00:00 2001
From: gilphilbert <gil.philbert@gmail.com>
Date: Sat, 3 Jul 2021 23:38:46 -0700
Subject: [PATCH] add passive i2c mode

---
 PN532/PN532.cpp | 18 ++++++++++++++++++
 PN532/PN532.h   |  1 +
 2 files changed, 19 insertions(+)

diff --git a/PN532/PN532.cpp b/PN532/PN532.cpp
index 7275c09..17701f1 100644
--- a/PN532/PN532.cpp
+++ b/PN532/PN532.cpp
@@ -385,6 +385,24 @@ bool PN532::setRFField(uint8_t autoRFCA, uint8_t rFOnOff)
 
 /***** ISO14443A Commands ******/
 
+/**************************************************************************/
+/*!
+    Puts PN532 into passive detection state with IRQ while waiting for an ISO14443A target
+
+    @param  cardBaudRate  Baud rate of the card
+
+    @returns 1 if everything executed properly, 0 for an error
+*/
+bool PN532::startPassiveTargetIDDetection(uint8_t cardbaudrate) {
+    pn532_packetbuffer[0] = PN532_COMMAND_INLISTPASSIVETARGET;
+    pn532_packetbuffer[1] = 1; // max 1 cards at once (we can set this to 2 later)
+    pn532_packetbuffer[2] = cardbaudrate;
+
+    if (HAL(writeCommand)(pn532_packetbuffer, 3)) {
+        return 0x0;  // command failed
+    }
+}
+
 /**************************************************************************/
 /*!
     Waits for an ISO14443A target to enter the field
diff --git a/PN532/PN532.h b/PN532/PN532.h
index 5ca3655..946b316 100644
--- a/PN532/PN532.h
+++ b/PN532/PN532.h
@@ -159,6 +159,7 @@ class PN532
 
     // ISO14443A functions
     bool inListPassiveTarget();
+    bool startPassiveTargetIDDetection(uint8_t cardbaudrate);
     bool readPassiveTargetID(uint8_t cardbaudrate, uint8_t *uid, uint8_t *uidLength, uint16_t timeout = 1000, bool inlist = false);
     bool inDataExchange(uint8_t *send, uint8_t sendLength, uint8_t *response, uint8_t *responseLength);