Resolved various compiler warnings

This should make Jenkins happy.

libraries/PN532/PN532.cpp

@@ -61,6 +61,7 @@ void PN532::begin()
 /**************************************************************************/
 void PN532::PrintHex(const uint8_t *data, const uint32_t numBytes)
 {
+    (void)data;
     for (uint8_t i = 0; i < numBytes; i++) {
         DMSG("0x");
         DMSG_HEX(data[i]);
@@ -86,11 +87,11 @@ void PN532::PrintHexChar(const uint8_t *data, const uint32_t numBytes)
     }
     DMSG("        ");
     for (uint8_t i = 0; i < numBytes; i++) {
-        char c = data[i];
+        uint8_t c = data[i];
         if (c <= 0x1f || c > 0x7f) {
             DMSG('.');
         } else {
-            DMSG(c);
+            DMSG((char)c);
         }
     }
 
@@ -548,7 +549,7 @@ uint8_t PN532::mifareclassic_WriteNDEFURI (uint8_t sectorNumber, uint8_t uriIden
     // in NDEF records
 
     // Setup the sector buffer (w/pre-formatted TLV wrapper and NDEF message)
-    uint8_t sectorbuffer1[16] = {0x00, 0x00, 0x03, len + 5, 0xD1, 0x01, len + 1, 0x55, uriIdentifier, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+    uint8_t sectorbuffer1[16] = {0x00, 0x00, 0x03, (uint8_t)(len + 5), 0xD1, 0x01, (uint8_t)(len + 1), 0x55, uriIdentifier, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
     uint8_t sectorbuffer2[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
     uint8_t sectorbuffer3[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
     uint8_t sectorbuffer4[16] = {0xD3, 0xF7, 0xD3, 0xF7, 0xD3, 0xF7, 0x7F, 0x07, 0x88, 0x40, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
@@ -653,6 +654,7 @@ uint8_t PN532::mifareultralight_ReadPage (uint8_t page, uint8_t *buffer)
 bool PN532::inDataExchange(uint8_t *send, uint8_t sendLength, uint8_t *response, uint8_t *responseLength)
 {
     uint8_t i;
+    (void)i;
 
     pn532_packetbuffer[0] = 0x40; // PN532_COMMAND_INDATAEXCHANGE;
     pn532_packetbuffer[1] = inListedTag;

libraries/PN532/llcp.cpp

@@ -37,6 +37,7 @@ int8_t LLCP::activate(uint16_t timeout)
 int8_t LLCP::waitForConnection(uint16_t timeout)
 {
 	uint8_t type;
+	(void)timeout;
 
 	sequence = 0;
 
@@ -76,6 +77,7 @@ int8_t LLCP::waitForConnection(uint16_t timeout)
 int8_t LLCP::waitForDisconnection(uint16_t timeout)
 {
 	uint8_t type;
+	(void)timeout;
 
 	// Get DISC PDU
 	DMSG("wait for a DISC PDU\n");
@@ -113,6 +115,7 @@ int8_t LLCP::waitForDisconnection(uint16_t timeout)
 int8_t LLCP::connect(uint16_t timeout)
 {
 	uint8_t type;
+	(void)timeout;
 
 	sequence = 0;
 
@@ -165,6 +168,7 @@ int8_t LLCP::connect(uint16_t timeout)
 int8_t LLCP::disconnect(uint16_t timeout)
 {
 	uint8_t type;
+	(void)timeout;
 
 	// try to get a SYMM PDU
 	if (2 > link.read(headerBuf, headerBufLen)) {
@@ -207,7 +211,6 @@ int8_t LLCP::disconnect(uint16_t timeout)
 
 bool LLCP::write(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
 {
-	uint8_t type;
 	uint8_t buf[3];
 
 	if (2 != link.read(buf, sizeof(buf))) {

libraries/PN532/snep.cpp

@@ -79,7 +79,7 @@ int16_t SNEP::read(uint8_t *buf, uint8_t len, uint16_t timeout)
 	}
 
 	// check message's length
-	uint32_t length = (buf[2] << 24) + (buf[3] << 16) + (buf[4] << 8) + buf[5];
+	uint32_t length = ((uint32_t)buf[2] << 24) + ((uint32_t)buf[3] << 16) + (buf[4] << 8) + buf[5];
 	// length should not be more than 244 (header + body < 255, header = 6 + 3 + 2)
 	if (length > (status - 6)) {
 		DMSG("The SNEP message is too large\n");