Fix buffer index overflow

Author: fkollmann

PN5180.cpp

@@ -445,7 +445,7 @@ status register contain information on the exception.
 bool PN5180::transceiveCommand(uint8_t *sendBuffer, size_t sendBufferLen, uint8_t *recvBuffer, size_t recvBufferLen) {
 #ifdef DEBUG
   PN5180DEBUG(F("Sending SPI frame: '"));
-  for (uint8_t i=0; i<sendBufferLen; i++) {
+  for (size_t i=0; i<sendBufferLen; i++) {
     if (i>0) PN5180DEBUG(" ");
     PN5180DEBUG(formatHex(sendBuffer[i]));
   }
@@ -457,7 +457,7 @@ bool PN5180::transceiveCommand(uint8_t *sendBuffer, size_t sendBufferLen, uint8_
   // 1.
   digitalWrite(PN5180_NSS, LOW); delay(2);
   // 2.
-  for (uint8_t i=0; i<sendBufferLen; i++) {
+  for (size_t i=0; i<sendBufferLen; i++) {
     SPI.transfer(sendBuffer[i]);
   }
   // 3.
@@ -475,7 +475,7 @@ bool PN5180::transceiveCommand(uint8_t *sendBuffer, size_t sendBufferLen, uint8_
   // 1.
   digitalWrite(PN5180_NSS, LOW); delay(2);
   // 2.
-  for (uint8_t i=0; i<recvBufferLen; i++) {
+  for (size_t i=0; i<recvBufferLen; i++) {
     recvBuffer[i] = SPI.transfer(0xff);
   }
   // 3.
@@ -487,7 +487,7 @@ bool PN5180::transceiveCommand(uint8_t *sendBuffer, size_t sendBufferLen, uint8_
 
 #ifdef DEBUG
   PN5180DEBUG(F("Received: "));
-  for (uint8_t i=0; i<recvBufferLen; i++) {
+  for (size_t i=0; i<recvBufferLen; i++) {
     if (i > 0) PN5180DEBUG(" ");
     PN5180DEBUG(formatHex(recvBuffer[i]));
   }