testnfc.go

package main

// #include <stdlib.h>
import "C"

import ("fmt"
        "github.com/fuzxxl/nfc/2.0/nfc"
	   "reflect"
	   "unsafe")

func main() {

	fmt.Printf("libnfc version %v\n",nfc.Version())
	//fmt.Printf("\n")
        devices,err := nfc.ListDevices()
        if err != nil {
          fmt.Println(err)
        } else {
          for i, v := range devices {
               fmt.Printf("device [%d]=%v\n", i, v)
          }
        }
       fmt.Println("opening first available device...\n")
       dev,err := nfc.Open("")
        if err != nil {
          fmt.Println(err)
        } else {
          defer dev.Close()
          fmt.Printf("connection =%v\n", dev.Connection())
        }
       fmt.Println("initiator init...\n")
       err = dev.InitiatorInit()
        if err != nil {
          fmt.Println(err)
        } else {
        mods,err := dev.SupportedModulations(nfc.InitiatorMode) 
        if err != nil {
          fmt.Println(err)
        } else {
			for i,v := range mods {
               fmt.Printf("modulation [%d]=%v\n", i, v)
          }
			var mod nfc.Modulation 
			mod.Type = nfc.ISO14443a
			mod.BaudRate = nfc.Nbr106
            fmt.Println("looking for targets..\n")
			targets, err := dev.InitiatorListPassiveTargets(mod)
            if err != nil {
              fmt.Println(err)
            } else {
			 for i,v := range targets {
				 fmt.Printf("target [%d]=%v type=%v\n", i, v, reflect.TypeOf(v))
			 }
/*
type ISO14443aTarget struct {
    Atqa   [2]byte
    Sak    byte
    UIDLen int // length of the Uid field
    UID    [10]byte
    AtsLen int // length of the ATS field
    // Maximal theoretical ATS is FSD-2, FSD=256 for FSDI=8 in RATS
    Ats  [254]byte // up to 254 bytes
    Baud int       // Baud rate
}

from libnfc nfc-types.h

00185 typedef struct {
00186   uint8_t  abtAtqa[2];
00187   uint8_t  btSak;
00188   size_t  szUidLen;
00189   uint8_t  abtUid[10];
00190   size_t  szAtsLen;
00191   uint8_t  abtAts[254]; // Maximal theoretical ATS is FSD-2, FSD=256 for FSDI=8 in RATS
00192 } nfc_iso14443a_info;

*/
                                unsafe_p := (unsafe.Pointer(targets[0].Marshall()))
                                defer C.free(unsafe_p)
                                mtarget := (*nfc.ISO14443aTarget)(unsafe_p) 
				fmt.Printf("Atqa =%v\n",mtarget.Atqa)
				fmt.Printf("Sak =%v\n",mtarget.Sak) 
                  		fmt.Printf("UIDLen =%v\n",mtarget.UIDLen)  
                  		fmt.Printf("UID =%v\n",mtarget.UID)                     
              }			
        }
     }
}