524 lines
17 KiB
C
524 lines
17 KiB
C
/*
|
|
|
|
Public platform independent Near Field Communication (NFC) library
|
|
Copyright (C) 2009, Roel Verdult
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "libnfc.h"
|
|
#include "acr122.h"
|
|
#include "bitutils.h"
|
|
|
|
#define REG_CIU_TX_MODE 0x6302
|
|
#define REG_CIU_RX_MODE 0x6303
|
|
#define REG_CIU_TX_AUTO 0x6305
|
|
#define REG_CIU_MANUAL_RCV 0x630D
|
|
#define REG_CIU_CONTROL 0x633C
|
|
#define REG_CIU_BIT_FRAMING 0x633D
|
|
|
|
#define PARAM_NONE 0x00
|
|
#define PARAM_NAD_USED 0x01
|
|
#define PARAM_DID_USED 0x02
|
|
#define PARAM_AUTO_ATR_RES 0x04
|
|
#define PARAM_AUTO_RATS 0x10
|
|
#define PARAM_14443_4_PICC 0x20
|
|
#define PARAM_NO_AMBLE 0x40
|
|
|
|
// PN532 configuration
|
|
byte pncmd_get_firmware_version [ 2] = { 0xD4,0x02 };
|
|
byte pncmd_get_general_status [ 2] = { 0xD4,0x04 };
|
|
byte pncmd_get_register [ 4] = { 0xD4,0x06 };
|
|
byte pncmd_set_register [ 5] = { 0xD4,0x08 };
|
|
byte pncmd_set_parameters [ 3] = { 0xD4,0x12 };
|
|
|
|
// RF field configuration
|
|
byte pncmd_rf_configure_field [ 4] = { 0xD4,0x32,0x01 };
|
|
byte pncmd_rf_configure_timing [ 4] = { 0xD4,0x32,0x02 };
|
|
byte pncmd_rf_configure_retry_data [ 4] = { 0xD4,0x32,0x04 };
|
|
byte pncmd_rf_configure_retry_select [ 6] = { 0xD4,0x32,0x05 };
|
|
|
|
// Reader
|
|
byte pncmd_reader_list_passive [264] = { 0xD4,0x4A };
|
|
byte pncmd_reader_select [ 3] = { 0xD4,0x54 };
|
|
byte pncmd_reader_deselect [ 3] = { 0xD4,0x44 };
|
|
byte pncmd_reader_release [ 3] = { 0xD4,0x52 };
|
|
byte pncmd_reader_set_baud_rate [ 5] = { 0xD4,0x4E };
|
|
byte pncmd_reader_exchange_data [265] = { 0xD4,0x40 };
|
|
byte pncmd_reader_auto_poll [ 5] = { 0xD4,0x60 };
|
|
|
|
// Target
|
|
byte pncmd_target_get_data [ 2] = { 0xD4,0x86 };
|
|
byte pncmd_target_init [ 39] = { 0xD4,0x8C };
|
|
byte pncmd_target_virtual_card [ 4] = { 0xD4,0x14 };
|
|
byte pncmd_target_receive [ 2] = { 0xD4,0x88 };
|
|
byte pncmd_target_send [264] = { 0xD4,0x90 };
|
|
byte pncmd_target_get_status [ 2] = { 0xD4,0x8A };
|
|
|
|
// Exchange raw data frames
|
|
byte pncmd_exchange_raw_data [266] = { 0xD4,0x42 };
|
|
|
|
// Global buffers used for communication with the PN532 chip
|
|
#define MAX_FRAME_LEN 264
|
|
static byte abtRx[MAX_FRAME_LEN];
|
|
static ui32 uiRxLen;
|
|
static ui8 ui8Value;
|
|
static ui32 ui32Len = 1;
|
|
|
|
bool pn532_transceive(const dev_id di, const byte* pbtTx, const ui32 uiTxLen)
|
|
{
|
|
uiRxLen = MAX_FRAME_LEN;
|
|
return acr122_transceive(di,pbtTx,uiTxLen,abtRx,&uiRxLen);
|
|
}
|
|
|
|
bool pn532_set_reg(const dev_id di, ui16 ui16Reg, ui8 ui8Value)
|
|
{
|
|
pncmd_set_register[2] = ui16Reg >> 8;
|
|
pncmd_set_register[3] = ui16Reg & 0xff;
|
|
pncmd_set_register[4] = ui8Value;
|
|
return acr122_transceive(di,pncmd_set_register,5,null,null);
|
|
}
|
|
|
|
byte pn532_get_reg(const dev_id di, ui16 ui16Reg)
|
|
{
|
|
pncmd_get_register[2] = ui16Reg >> 8;
|
|
pncmd_get_register[3] = ui16Reg & 0xff;
|
|
acr122_transceive(di,pncmd_get_register,4,&ui8Value,&ui32Len);
|
|
return ui8Value;
|
|
}
|
|
|
|
bool pn532_set_parameters(const dev_id di, ui8 ui8Value)
|
|
{
|
|
pncmd_set_parameters[2] = ui8Value;
|
|
return acr122_transceive(di,pncmd_set_parameters,3,null,null);
|
|
}
|
|
|
|
bool pn532_wrap_frame(const byte* pbtTx, const ui32 uiTxBits, const byte* pbtTxPar, byte* pbtFrame, ui32* puiFrameBits)
|
|
{
|
|
byte btFrame;
|
|
byte btData;
|
|
ui32 uiBitPos;
|
|
ui32 uiDataPos = 0;
|
|
ui32 uiBitsLeft = uiTxBits;
|
|
|
|
// Make sure we should frame at least something
|
|
if (uiBitsLeft == 0) return false;
|
|
|
|
// Handle a short response (1byte) as a special case
|
|
if (uiBitsLeft < 9)
|
|
{
|
|
*pbtFrame = *pbtTx;
|
|
*puiFrameBits = uiTxBits;
|
|
return true;
|
|
}
|
|
|
|
// We start by calculating the frame length in bits
|
|
*puiFrameBits = uiTxBits + (uiTxBits/8);
|
|
|
|
// Parse the data bytes and add the parity bits
|
|
// This is really a sensitive process, mirror the frame bytes and append parity bits
|
|
// buffer = mirror(frame-byte) + parity + mirror(frame-byte) + parity + ...
|
|
// split "buffer" up in segments of 8 bits again and mirror them
|
|
// air-bytes = mirror(buffer-byte) + mirror(buffer-byte) + mirror(buffer-byte) + ..
|
|
while(true)
|
|
{
|
|
// Reset the temporary frame byte;
|
|
btFrame = 0;
|
|
|
|
for (uiBitPos=0; uiBitPos<8; uiBitPos++)
|
|
{
|
|
// Copy as much data that fits in the frame byte
|
|
btData = mirror(pbtTx[uiDataPos]);
|
|
btFrame |= (btData >> uiBitPos);
|
|
// Save this frame byte
|
|
*pbtFrame = mirror(btFrame);
|
|
// Set the remaining bits of the date in the new frame byte and append the parity bit
|
|
btFrame = (btData << (8-uiBitPos));
|
|
btFrame |= ((pbtTxPar[uiDataPos] & 0x01) << (7-uiBitPos));
|
|
// Backup the frame bits we have so far
|
|
pbtFrame++;
|
|
*pbtFrame = mirror(btFrame);
|
|
// Increase the data (without parity bit) position
|
|
uiDataPos++;
|
|
// Test if we are done
|
|
if (uiBitsLeft < 9) return true;
|
|
uiBitsLeft -= 8;
|
|
}
|
|
// Every 8 data bytes we lose one frame byte to the parities
|
|
pbtFrame++;
|
|
}
|
|
}
|
|
|
|
bool pn532_unwrap_frame(const byte* pbtFrame, const ui32 uiFrameBits, byte* pbtRx, ui32* puiRxBits, byte* pbtRxPar)
|
|
{
|
|
byte btFrame;
|
|
byte btData;
|
|
ui8 uiBitPos;
|
|
ui32 uiDataPos = 0;
|
|
byte* pbtFramePos = (byte*) pbtFrame;
|
|
ui32 uiBitsLeft = uiFrameBits;
|
|
|
|
// Make sure we should frame at least something
|
|
if (uiBitsLeft == 0) return false;
|
|
|
|
// Handle a short response (1byte) as a special case
|
|
if (uiBitsLeft < 9)
|
|
{
|
|
*pbtRx = *pbtFrame;
|
|
*puiRxBits = uiFrameBits;
|
|
return true;
|
|
}
|
|
|
|
// Calculate the data length in bits
|
|
*puiRxBits = uiFrameBits - (uiFrameBits/9);
|
|
|
|
// Parse the frame bytes, remove the parity bits and store them in the parity array
|
|
// This process is the reverse of WrapFrame(), look there for more info
|
|
while(true)
|
|
{
|
|
for (uiBitPos=0; uiBitPos<8; uiBitPos++)
|
|
{
|
|
btFrame = mirror(pbtFramePos[uiDataPos]);
|
|
btData = (btFrame << uiBitPos);
|
|
btFrame = mirror(pbtFramePos[uiDataPos+1]);
|
|
btData |= (btFrame >> (8-uiBitPos));
|
|
pbtRx[uiDataPos] = mirror(btData);
|
|
if(pbtRxPar != null) pbtRxPar[uiDataPos] = ((btFrame >> (7-uiBitPos)) & 0x01);
|
|
// Increase the data (without parity bit) position
|
|
uiDataPos++;
|
|
// Test if we are done
|
|
if (uiBitsLeft < 9) return true;
|
|
uiBitsLeft -= 9;
|
|
}
|
|
// Every 8 data bytes we lose one frame byte to the parities
|
|
pbtFramePos++;
|
|
}
|
|
}
|
|
|
|
bool nfc_configure_handle_crc(const dev_id di, const bool bEnable)
|
|
{
|
|
if (bEnable)
|
|
{
|
|
// Enable automatic receiving/sending of CRC bytes
|
|
if (!pn532_set_reg(di,REG_CIU_TX_MODE,pn532_get_reg(di,REG_CIU_TX_MODE) | 0x80)) return false;
|
|
if (!pn532_set_reg(di,REG_CIU_RX_MODE,pn532_get_reg(di,REG_CIU_RX_MODE) | 0x80)) return false;
|
|
} else {
|
|
// Disable automatic receiving/sending of CRC bytes
|
|
if (!pn532_set_reg(di,REG_CIU_TX_MODE,pn532_get_reg(di,REG_CIU_TX_MODE) & 0x7f)) return false;
|
|
if (!pn532_set_reg(di,REG_CIU_RX_MODE,pn532_get_reg(di,REG_CIU_RX_MODE) & 0x7f)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool nfc_configure_handle_parity(const dev_id di, const bool bEnable)
|
|
{
|
|
if (bEnable)
|
|
{
|
|
// Handle parity by chip
|
|
if (!pn532_set_reg(di,REG_CIU_MANUAL_RCV,pn532_get_reg(di,REG_CIU_MANUAL_RCV) & 0xef)) return false;
|
|
|
|
} else {
|
|
// Parse parity as data bit
|
|
if (!pn532_set_reg(di,REG_CIU_MANUAL_RCV,pn532_get_reg(di,REG_CIU_MANUAL_RCV) | 0x10)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool nfc_configure_field(const dev_id di, const bool bEnable)
|
|
{
|
|
pncmd_rf_configure_field[3] = (bEnable) ? 1 : 0;
|
|
return acr122_transceive(di,pncmd_rf_configure_field,4,null,null);
|
|
}
|
|
|
|
bool nfc_configure_list_passive_infinite(const dev_id di, const bool bEnable)
|
|
{
|
|
// Retry format: 0x00 means only 1 try, 0xff means infinite
|
|
pncmd_rf_configure_retry_select[3] = (bEnable) ? 0xff : 0x00; // MxRtyATR, default: active = 0xff, passive = 0x02
|
|
pncmd_rf_configure_retry_select[4] = (bEnable) ? 0xff : 0x00; // MxRtyPSL, default: 0x01
|
|
pncmd_rf_configure_retry_select[5] = (bEnable) ? 0xff : 0x00; // MxRtyPassiveActivation, default: 0xff
|
|
return acr122_transceive(di,pncmd_rf_configure_retry_select,6,null,null);
|
|
}
|
|
|
|
bool nfc_configure_accept_invalid_frames(const dev_id di, const bool bEnable)
|
|
{
|
|
if (bEnable)
|
|
{
|
|
// Handle parity by chip
|
|
if (!pn532_set_reg(di,REG_CIU_RX_MODE,pn532_get_reg(di,REG_CIU_RX_MODE) | 0x08)) return false;
|
|
|
|
} else {
|
|
// Parse parity as data bit
|
|
if (!pn532_set_reg(di,REG_CIU_RX_MODE,pn532_get_reg(di,REG_CIU_RX_MODE) | 0xf7)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool nfc_configure_accept_multiple_frames(const dev_id di, const bool bEnable)
|
|
{
|
|
if (bEnable)
|
|
{
|
|
// Handle parity by chip
|
|
if (!pn532_set_reg(di,REG_CIU_RX_MODE,pn532_get_reg(di,REG_CIU_RX_MODE) | 0x04)) return false;
|
|
|
|
} else {
|
|
// Parse parity as data bit
|
|
if (!pn532_set_reg(di,REG_CIU_RX_MODE,pn532_get_reg(di,REG_CIU_RX_MODE) | 0xfb)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool nfc_reader_init(const dev_id di)
|
|
{
|
|
// Try to connect to the NFC reader
|
|
if (di == INVALID_DEVICE_ID) return INVALID_DEVICE_ID;
|
|
|
|
// Let the PN5XX automatically be activated by the RF level detector
|
|
if (!pn532_set_reg(di,REG_CIU_TX_AUTO,pn532_get_reg(di,REG_CIU_TX_AUTO) | 0x40)) return false;
|
|
|
|
// Configure the PN532 to be an Initiator or Reader/Writer
|
|
if (!pn532_set_reg(di,REG_CIU_CONTROL,pn532_get_reg(di,REG_CIU_CONTROL) | 0x10)) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool nfc_reader_list_passive(const dev_id di, const ModulationType mt, const byte* pbtInitData, const ui32 uiInitDataLen, byte* pbtTag, ui32* puiTagLen)
|
|
{
|
|
pncmd_reader_list_passive[2] = 1; // MaxTg, we only want to select 1 tag at the time
|
|
pncmd_reader_list_passive[3] = mt; // BrTy, the type of modulation used for polling a passive tag
|
|
|
|
// Set the optional initiator data (used for Felica, ISO14443B, Topaz Polling or selecting a specific UID).
|
|
if (pbtInitData) memcpy(pncmd_reader_list_passive+4,pbtInitData,uiInitDataLen);
|
|
|
|
// Try to find the available tags
|
|
if (!acr122_transceive(di,pncmd_reader_list_passive,4+uiInitDataLen,pbtTag,puiTagLen)) return false;
|
|
|
|
// Return true only if at least one tag has been found, the PN532 returns 0x00 if none was available
|
|
return (pbtTag[0] != 0x00);
|
|
}
|
|
|
|
bool nfc_reader_transceive_7bits(const dev_id di, const byte btTx, byte* pbtRx, ui32* puiRxLen)
|
|
{
|
|
// Set transmission bits to 7
|
|
if (!pn532_set_reg(di,REG_CIU_BIT_FRAMING,7)) return false;
|
|
|
|
pncmd_exchange_raw_data[2] = btTx;
|
|
if (!pn532_transceive(di,pncmd_exchange_raw_data,3)) return false;
|
|
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
*puiRxLen = uiRxLen-1;
|
|
memcpy(pbtRx,abtRx+1,*puiRxLen);
|
|
|
|
// Reset transmission bits count
|
|
if (!pn532_set_reg(di,REG_CIU_BIT_FRAMING,0)) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool nfc_reader_transceive_bytes(const dev_id di, const byte* pbtTx, const ui32 uiTxLen, byte* pbtRx, ui32* puiRxLen)
|
|
{
|
|
memcpy(pncmd_exchange_raw_data+2,pbtTx,uiTxLen);
|
|
|
|
if (!pn532_transceive(di,pncmd_exchange_raw_data,2+uiTxLen)) return false;
|
|
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
*puiRxLen = uiRxLen-1;
|
|
memcpy(pbtRx,abtRx+1,*puiRxLen);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool nfc_reader_transceive_bits(const dev_id di, const byte* pbtTx, const ui32 uiTxBits, const byte* pbtTxPar, byte* pbtRx, ui32* puiRxBits, byte* pbtRxPar)
|
|
{
|
|
ui32 uiFrameBits = 0;
|
|
ui8 ui8Bits = 0;
|
|
|
|
// Convert data to a frame
|
|
pn532_wrap_frame(pbtTx,uiTxBits,pbtTxPar,pncmd_exchange_raw_data+2,&uiFrameBits);
|
|
|
|
// Retrieve the resting bits
|
|
ui8Bits = uiFrameBits%8;
|
|
|
|
// Set the amount of transmission bits in the pn532 chip register
|
|
if (!pn532_set_reg(di,REG_CIU_BIT_FRAMING,ui8Bits)) return false;
|
|
|
|
// Send the frame to the pn532 chip and get the answer
|
|
// We have to give the amount of bytes + 1 byte if there are leading bits + the two 0xD4,0x42
|
|
if (!pn532_transceive(di,pncmd_exchange_raw_data,(uiFrameBits/8)+((ui8Bits==0)?0:1)+2)) return false;
|
|
|
|
// Make sure there was no failure reported by the PN532 chip (0 == OK)
|
|
// TODO: is this ACR122 specific?
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
|
|
// Get the last bit-count that is stored in the received byte
|
|
ui8Bits = pn532_get_reg(di,REG_CIU_CONTROL) & 0x07;
|
|
|
|
// Unwrap the response frame
|
|
pn532_unwrap_frame(abtRx+1,((uiRxLen-1-((ui8Bits==0)?0:1))*8)+ui8Bits,pbtRx,puiRxBits,pbtRxPar);
|
|
|
|
// Everything went successful
|
|
return true;
|
|
}
|
|
|
|
bool nfc_reader_mifare_cmd(const dev_id di, const MifareCmd mc, const ui8 ui8Block, MifareParam* pmp)
|
|
{
|
|
ui32 uiParamLen;
|
|
pncmd_reader_exchange_data[2] = 0x01; // Use first target/card
|
|
pncmd_reader_exchange_data[3] = mc; // The MIFARE Classic command
|
|
pncmd_reader_exchange_data[4] = ui8Block; // The block address (1K=0x00..0x39, 4K=0x00..0xff)
|
|
|
|
switch (mc)
|
|
{
|
|
// Read and store command have no parameter
|
|
case MC_READ:
|
|
case MC_STORE:
|
|
uiParamLen = 0;
|
|
break;
|
|
|
|
// Authenticate command
|
|
case MC_AUTH_A:
|
|
case MC_AUTH_B:
|
|
uiParamLen = sizeof(MifareParamAuth);
|
|
break;
|
|
|
|
// Data command
|
|
case MC_WRITE:
|
|
uiParamLen = sizeof(MifareParamData);
|
|
break;
|
|
|
|
// Value command
|
|
case MC_DECREMENT:
|
|
case MC_INCREMENT:
|
|
case MC_TRANSFER:
|
|
uiParamLen = sizeof(MifareParamValue);
|
|
break;
|
|
|
|
// Please fix your code, you never should reach this statement
|
|
default:
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
// When available, copy the parameter bytes
|
|
if (uiParamLen) memcpy(pncmd_reader_exchange_data+5,(byte*)pmp,uiParamLen);
|
|
|
|
// Fire the mifare command
|
|
if (!pn532_transceive(di,pncmd_reader_exchange_data,5+uiParamLen)) return false;
|
|
|
|
// Make sure there was no failure reported by the PN532 chip (0 == OK)
|
|
// TODO: is this ACR122 specific?
|
|
if (abtRx[0] != 0) return false;
|
|
|
|
// When we have executed a read command, copy the received bytes into the param
|
|
if (mc == MC_READ) memcpy(pmp->mpd.abtData,abtRx+1,16);
|
|
|
|
// Command succesfully executed
|
|
return true;
|
|
}
|
|
|
|
bool nfc_target_init(const dev_id di, byte* pbtRx, ui32* puiRxLen)
|
|
{
|
|
// Clear the target init struct, reset to all zeros
|
|
memset(pncmd_target_init+2,0x00,37);
|
|
|
|
// Set ATQA (SENS_RES)
|
|
pncmd_target_init[3] = 0x04;
|
|
pncmd_target_init[4] = 0x00;
|
|
|
|
// Set SAK (SEL_RES)
|
|
pncmd_target_init[8] = 0x20;
|
|
|
|
// Set UID
|
|
pncmd_target_init[5] = 0x00;
|
|
pncmd_target_init[6] = 0xb0;
|
|
pncmd_target_init[7] = 0x0b;
|
|
|
|
// Enable CRC & parity, needed for target_init to work properly
|
|
nfc_configure_handle_crc(di,true);
|
|
nfc_configure_handle_parity(di,true);
|
|
|
|
// Request the initialization as a target
|
|
if (!pn532_transceive(di,pncmd_target_init,39)) return false;
|
|
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
*puiRxLen = uiRxLen-1;
|
|
memcpy(pbtRx,abtRx+1,*puiRxLen);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool nfc_target_receive_bytes(const dev_id di, byte* pbtRx, ui32* puiRxLen)
|
|
{
|
|
if (!pn532_transceive(di,pncmd_target_receive,2)) return false;
|
|
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
*puiRxLen = uiRxLen-1;
|
|
memcpy(pbtRx,abtRx+1,*puiRxLen);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool nfc_target_receive_bits(const dev_id di, byte* pbtRx, ui32* puiRxBits, byte* pbtRxPar)
|
|
{
|
|
ui8 ui8Bits;
|
|
|
|
// Try to gather the received frames from the reader
|
|
if (!pn532_transceive(di,pncmd_target_receive,2)) return false;
|
|
|
|
// Make sure there was no failure reported by the PN532 chip (0 == OK)
|
|
// TODO: is this ACR122 specific?
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
|
|
// Get the last bit-count that is stored in the received byte
|
|
ui8Bits = pn532_get_reg(di,REG_CIU_CONTROL) & 0x07;
|
|
|
|
// Unwrap the response frame
|
|
pn532_unwrap_frame(abtRx+1,((uiRxLen-1-((ui8Bits==0)?0:1))*8)+ui8Bits,pbtRx,puiRxBits,pbtRxPar);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool nfc_target_send_bytes(const dev_id di, const byte* pbtTx, const ui32 uiTxLen)
|
|
{
|
|
memcpy(pncmd_target_send+2,pbtTx,uiTxLen);
|
|
return acr122_transceive(di,pncmd_target_send,2+uiTxLen,null,null);
|
|
}
|
|
|
|
bool nfc_target_send_bits(const dev_id di, const byte* pbtTx, const ui32 uiTxBits, const byte* pbtTxPar)
|
|
{
|
|
ui32 uiFrameBits = 0;
|
|
ui8 ui8Bits = 0;
|
|
|
|
// Convert data to a frame
|
|
pn532_wrap_frame(pbtTx,uiTxBits,pbtTxPar,pncmd_target_send+2,&uiFrameBits);
|
|
|
|
// Retrieve the resting bits
|
|
ui8Bits = uiFrameBits%8;
|
|
|
|
// Set the amount of transmission bits in the pn532 chip register
|
|
if (!pn532_set_reg(di,REG_CIU_BIT_FRAMING,ui8Bits)) return false;
|
|
|
|
// Try to send the bits to the reader
|
|
if (!pn532_transceive(di,pncmd_target_send,(uiFrameBits/8)+((ui8Bits==0)?0:1)+2)) return false;
|
|
|
|
// Make sure there was no failure reported by the PN532 chip (0 == OK)
|
|
// TODO: is this ACR122 specific?
|
|
if (uiRxLen == 1 || abtRx[0] != 0) return false;
|
|
|
|
// Everyting seems ok, return true
|
|
return true;
|
|
}
|
|
|