PN532 NFC library for Seeed Studio's NFC Shield

Fork of PN532 by Yihui Xiong

Revision:
1:b8cab5222fd0
Parent:
0:9c6b9280c0e1
Child:
3:4189a10038e6
diff -r 9c6b9280c0e1 -r b8cab5222fd0 PN532_SPI.cpp
--- a/PN532_SPI.cpp	Tue Oct 08 08:33:22 2013 +0000
+++ b/PN532_SPI.cpp	Thu Oct 17 06:37:26 2013 +0000
@@ -12,17 +12,17 @@
     _spi = &spi;
     _spi->format(8, 0);
     _spi->frequency(2000000);
-    
+
     _ss  = 1;
 }
 
 PN532_SPI::PN532_SPI(SPI *spi, PinName ss) : _ss(ss)
 {
-        command = 0;
+    command = 0;
     _spi = spi;
     _spi->format(8, 0);
     _spi->frequency(2000000);
-    
+
     _ss  = 1;
 }
 
@@ -42,7 +42,7 @@
 {
     command = buf[0];
     writeFrame(buf, len);
-    
+
     uint8_t timeout = PN532_ACK_WAIT_TIME;
     while (!isReady()) {
         wait_ms(1);
@@ -69,59 +69,59 @@
             return PN532_TIMEOUT;
         }
     }
-    
+
     _ss = 0;
     wait_ms(1);
 
     int16_t result;
     do {
         write(DATA_READ);
-        
+
         if (0x00 != read()      ||       // PREAMBLE
                 0x00 != read()  ||       // STARTCODE1
                 0xFF != read()           // STARTCODE2
-            ) {
-            
+           ) {
+
             result = PN532_INVALID_FRAME;
             break;
         }
-        
+
         uint8_t length = read();
         if (0 != (uint8_t)(length + read())) {   // checksum of length
             result = PN532_INVALID_FRAME;
             break;
         }
-        
+
         uint8_t cmd = command + 1;               // response command
         if (PN532_PN532TOHOST != read() || (cmd) != read()) {
             result = PN532_INVALID_FRAME;
             break;
         }
-        
+
         DMSG("read:  ");
         DMSG_HEX(cmd);
-        
+
         length -= 2;
         if (length > len) {
             for (uint8_t i = 0; i < length; i++) {
                 DMSG_HEX(read());                 // dump message
             }
             DMSG("\nNot enough space\n");
-            read();                                     
+            read();
             read();
             result = PN532_NO_SPACE;  // not enough space
             break;
         }
-        
+
         uint8_t sum = PN532_PN532TOHOST + cmd;
         for (uint8_t i = 0; i < length; i++) {
             buf[i] = read();
             sum += buf[i];
-            
+
             DMSG_HEX(buf[i]);
         }
         DMSG("\n");
-        
+
         uint8_t checksum = read();
         if (0 != (uint8_t)(sum + checksum)) {
             DMSG("checksum is not ok\n");
@@ -129,19 +129,19 @@
             break;
         }
         read();         // POSTAMBLE
-        
+
         result = length;
     } while (0);
-    
+
     _ss = 1;
-    
+
     return result;
 }
 
 bool PN532_SPI::isReady()
 {
     _ss = 0;
-    
+
     write(STATUS_READ);
     uint8_t status = read() & 1;
     _ss = 1;
@@ -152,52 +152,52 @@
 {
     _ss = 0;
     wait_ms(2);               // wake up PN532
-    
+
     write(DATA_WRITE);
     write(PN532_PREAMBLE);
     write(PN532_STARTCODE1);
     write(PN532_STARTCODE2);
-    
+
     uint8_t length = len + 1;   // length of data field: TFI + DATA
     write(length);
     write(~length + 1);         // checksum of length
-    
+
     write(PN532_HOSTTOPN532);
     uint8_t sum = PN532_HOSTTOPN532;    // sum of TFI + DATA
-    
+
     DMSG("write: ");
-    
+
     for (uint8_t i = 0; i < len; i++) {
         write(buf[i]);
         sum += buf[i];
-        
+
         DMSG_HEX(buf[i]);
     }
-    
+
     uint8_t checksum = ~sum + 1;        // checksum of TFI + DATA
     write(checksum);
     write(PN532_POSTAMBLE);
-    
-    _ss = 1; 
-    
+
+    _ss = 1;
+
     DMSG("\n");
 }
 
 int8_t PN532_SPI::readAckFrame()
 {
     const uint8_t PN532_ACK[] = {0, 0, 0xFF, 0, 0xFF, 0};
-    
+
     uint8_t ackBuf[sizeof(PN532_ACK)];
-    
+
     _ss = 0;
     wait_ms(1);
     write(DATA_READ);
-    
+
     for (uint8_t i = 0; i < sizeof(PN532_ACK); i++) {
         ackBuf[i] = read();
     }
-    
+
     _ss = 1;
-    
+
     return memcmp(ackBuf, PN532_ACK, sizeof(PN532_ACK));
 }