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https://github.com/nfc-tools/libnfc.git
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First attempt to reorganize tree.
This commit is contained in:
Romuald Conty
199
src/lib/drivers/pn532_uart.c
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199
src/lib/drivers/pn532_uart.c
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/**
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* Public platform independent Near Field Communication (NFC) library
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*
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* Copyright (C) 2009, Roel Verdult
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*
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* @file dev_pn532_uart.c
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* @brief
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*/
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#include "dev_pn532_uart.h"
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#include "rs232.h"
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#include "bitutils.h"
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#include "messages.h"
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#ifdef _WIN32
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#define SERIAL_STRING "COM"
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#define delay_ms( X ) Sleep( X )
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#else
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// unistd.h is needed for usleep() fct.
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#include <unistd.h>
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#define delay_ms( X ) usleep( X * 1000 )
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#ifdef __APPLE__
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// MacOS
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#define SERIAL_STRING "/dev/tty.SLAB_USBtoUART"
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#else
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// *BSD, Linux and others POSIX systems
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#define SERIAL_STRING "/dev/ttyUSB"
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#endif
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#endif
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#define BUFFER_LENGTH 256
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#define SERIAL_DEFAULT_PORT_SPEED 115200
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dev_info* dev_pn532_uart_connect(const nfc_device_desc_t* pndd)
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{
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uint32_t uiDevNr;
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serial_port sp;
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char acConnect[BUFFER_LENGTH];
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dev_info* pdi = INVALID_DEVICE_INFO;
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if( pndd == NULL ) {
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#ifdef DISABLE_SERIAL_AUTOPROBE
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INFO("Sorry, serial auto-probing have been disabled at compile time.");
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return INVALID_DEVICE_INFO;
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#else
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DBG("Trying to find ARYGON device on serial port: %s# at %d bauds.",SERIAL_STRING, SERIAL_DEFAULT_PORT_SPEED);
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// I have no idea how MAC OS X deals with multiple devices, so a quick workaround
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for (uiDevNr=0; uiDevNr<MAX_DEVICES; uiDevNr++)
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{
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#ifdef __APPLE__
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strcpy(acConnect,SERIAL_STRING);
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#else
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sprintf(acConnect,"%s%d",SERIAL_STRING,uiDevNr);
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#endif /* __APPLE__ */
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sp = rs232_open(acConnect);
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if ((sp != INVALID_SERIAL_PORT) && (sp != CLAIMED_SERIAL_PORT))
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{
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rs232_set_speed(sp, SERIAL_DEFAULT_PORT_SPEED);
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break;
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}
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#ifdef DEBUG
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if (sp == INVALID_SERIAL_PORT) DBG("Invalid serial port: %s",acConnect);
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if (sp == CLAIMED_SERIAL_PORT) DBG("Serial port already claimed: %s",acConnect);
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#endif /* DEBUG */
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}
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#endif
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// Test if we have found a device
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if (uiDevNr == MAX_DEVICES) return INVALID_DEVICE_INFO;
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} else {
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DBG("Connecting to: %s at %d bauds.",pndd->pcPort, pndd->uiSpeed);
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strcpy(acConnect,pndd->pcPort);
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sp = rs232_open(acConnect);
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if (sp == INVALID_SERIAL_PORT) ERR("Invalid serial port: %s",acConnect);
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if (sp == CLAIMED_SERIAL_PORT) ERR("Serial port already claimed: %s",acConnect);
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if ((sp == CLAIMED_SERIAL_PORT) || (sp == INVALID_SERIAL_PORT)) return INVALID_DEVICE_INFO;
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rs232_set_speed(sp, pndd->uiSpeed);
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}
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/** @info PN532C106 wakeup. */
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/** @todo Put this command in pn53x init process */
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byte_t abtRxBuf[BUFFER_LENGTH];
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size_t szRxBufLen;
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const byte_t pncmd_pn532c106_wakeup[] = { 0x55,0x55,0x00,0x00,0x00,0x00,0x00,0xFF,0x03,0xFD,0xD4,0x14,0x01,0x17,0x00 };
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rs232_send(sp, pncmd_pn532c106_wakeup, sizeof(pncmd_pn532c106_wakeup));
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delay_ms(10);
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if (!rs232_receive(sp,abtRxBuf,&szRxBufLen)) {
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ERR("Unable to receive data. (RX)");
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return NULL;
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}
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#ifdef DEBUG
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printf(" RX: ");
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print_hex(abtRxBuf,szRxBufLen);
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#endif
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DBG("Successfully connected to: %s",acConnect);
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// We have a connection
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pdi = malloc(sizeof(dev_info));
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strcpy(pdi->acName,"PN532_UART");
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pdi->ct = CT_PN532;
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pdi->ds = (dev_spec)sp;
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pdi->bActive = true;
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pdi->bCrc = true;
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pdi->bPar = true;
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pdi->ui8TxBits = 0;
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return pdi;
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}
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void dev_pn532_uart_disconnect(dev_info* pdi)
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{
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rs232_close((serial_port)pdi->ds);
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free(pdi);
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}
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bool dev_pn532_uart_transceive(const dev_spec ds, const byte_t* pbtTx, const size_t szTxLen, byte_t* pbtRx, size_t* pszRxLen)
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{
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byte_t abtTxBuf[BUFFER_LENGTH] = { 0x00, 0x00, 0xff }; // Every packet must start with "00 00 ff"
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byte_t abtRxBuf[BUFFER_LENGTH];
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size_t szRxBufLen = BUFFER_LENGTH;
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size_t szPos;
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// Packet length = data length (len) + checksum (1) + end of stream marker (1)
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abtTxBuf[3] = szTxLen;
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// Packet length checksum
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abtTxBuf[4] = BUFFER_LENGTH - abtTxBuf[3];
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// Copy the PN53X command into the packet buffer
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memmove(abtTxBuf+5,pbtTx,szTxLen);
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// Calculate data payload checksum
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abtTxBuf[szTxLen+5] = 0;
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for(szPos=0; szPos < szTxLen; szPos++)
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{
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abtTxBuf[szTxLen+5] -= abtTxBuf[szPos+5];
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}
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// End of stream marker
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abtTxBuf[szTxLen+6] = 0;
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#ifdef DEBUG
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printf(" TX: ");
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print_hex(abtTxBuf,szTxLen+7);
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#endif
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if (!rs232_send((serial_port)ds,abtTxBuf,szTxLen+7)) {
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ERR("Unable to transmit data. (TX)");
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return false;
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}
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/** @note PN532 (at 115200 bauds) need 20ms between sending and receiving frame.
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* It seems to be a required delay to able to send from host to device, plus the device computation then device respond transmission
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*/
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delay_ms(20);
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/** @note PN532 (at 115200 bauds) need 30ms more to be stable (report correctly present tag, at each try: 20ms seems to be enought for one shot...)
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* PN532 seems to work correctly with 50ms at 115200 bauds.
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*/
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delay_ms(30);
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if (!rs232_receive((serial_port)ds,abtRxBuf,&szRxBufLen)) {
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ERR("Unable to receive data. (RX)");
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return false;
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}
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#ifdef DEBUG
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printf(" RX: ");
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print_hex(abtRxBuf,szRxBufLen);
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#endif
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// When the answer should be ignored, just return a successful result
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if(pbtRx == NULL || pszRxLen == NULL) return true;
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// Only succeed when the result is at least 00 00 ff 00 ff 00 00 00 FF xx Fx Dx xx .. .. .. xx 00 (x = variable)
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if(szRxBufLen < 15) return false;
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// Remove the preceding and appending bytes 00 00 ff 00 ff 00 00 00 FF xx Fx .. .. .. xx 00 (x = variable)
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*pszRxLen = szRxBufLen - 15;
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memcpy(pbtRx, abtRxBuf+13, *pszRxLen);
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return true;
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}
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