255 lines
7.5 KiB
C
255 lines
7.5 KiB
C
/*-
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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 pn532_uart.c
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* @brief PN532 driver using UART bus (UART, RS232, etc.)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif // HAVE_CONFIG_H
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#include "../drivers.h"
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#include "../bitutils.h"
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#include <stdio.h>
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#include <string.h>
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#include "pn532_uart.h"
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#include <nfc/nfc-messages.h>
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// Bus
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#include "uart.h"
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#ifdef _WIN32
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#define SERIAL_STRING "COM"
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#define snprintf _snprintf
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#define strdup _strdup
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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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#ifdef __APPLE__
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// MacOS
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// TODO: find UART connection string for PN53X device on Mac OS X
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#define SERIAL_STRING ""
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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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nfc_device_desc_t *
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pn532_uart_pick_device (void)
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{
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nfc_device_desc_t *pndd;
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if ((pndd = malloc (sizeof (*pndd)))) {
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size_t szN;
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if (!pn532_uart_list_devices (pndd, 1, &szN)) {
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DBG("%s", "pn532_uart_list_devices failed");
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return NULL;
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}
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if (szN == 0) {
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DBG("%s", "No device found");
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return NULL;
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}
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}
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return pndd;
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}
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bool
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pn532_uart_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound)
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{
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/** @note: Due to UART bus we can't know if its really a pn532 without
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* sending some PN53x commands. But using this way to probe devices, we can
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* have serious problem with other device on this bus */
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#ifndef SERIAL_AUTOPROBE_ENABLED
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(void)pnddDevices;
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(void)szDevices;
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*pszDeviceFound = 0;
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DBG("%s", "Serial auto-probing have been disabled at compile time. Skipping autoprobe.");
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return false;
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#else /* SERIAL_AUTOPROBE_ENABLED */
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*pszDeviceFound = 0;
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serial_port sp;
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char acConnect[BUFFER_LENGTH];
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int iDevice;
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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 (iDevice=0; iDevice<DRIVERS_MAX_DEVICES; iDevice++)
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{
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#ifdef __APPLE__
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strcpy(acConnect,SERIAL_STRING);
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#else /* __APPLE__ */
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sprintf(acConnect,"%s%d",SERIAL_STRING,iDevice);
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#endif /* __APPLE__ */
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sp = uart_open(acConnect);
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DBG("Trying to find PN532 device on serial port: %s at %d bauds.",acConnect, SERIAL_DEFAULT_PORT_SPEED);
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if ((sp != INVALID_SERIAL_PORT) && (sp != CLAIMED_SERIAL_PORT))
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{
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// Serial port claimed: a PN532_UART may be found...
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// FIXME try to send a command to PN53x to know if you really have a PN53x connected here
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uart_close(sp);
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snprintf(pnddDevices[*pszDeviceFound].acDevice, DEVICE_NAME_LENGTH - 1, "%s (%s)", "PN532", acConnect);
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pnddDevices[*pszDeviceFound].acDevice[DEVICE_NAME_LENGTH - 1] = '\0';
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pnddDevices[*pszDeviceFound].pcDriver = PN532_UART_DRIVER_NAME;
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//pnddDevices[*pszDeviceFound].pcPort = strndup(acConnect, BUFFER_LENGTH - 1);
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pnddDevices[*pszDeviceFound].pcPort = strdup(acConnect);
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pnddDevices[*pszDeviceFound].pcPort[BUFFER_LENGTH] = '\0';
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pnddDevices[*pszDeviceFound].uiSpeed = SERIAL_DEFAULT_PORT_SPEED;
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DBG("Device found: %s.", pnddDevices[*pszDeviceFound].acDevice);
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(*pszDeviceFound)++;
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// Test if we reach the maximum "wanted" devices
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if((*pszDeviceFound) >= szDevices) 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 /* SERIAL_AUTOPROBE_ENABLED */
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return true;
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}
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nfc_device_t* pn532_uart_connect(const nfc_device_desc_t* pndd)
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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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serial_port sp;
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nfc_device_t* pnd = NULL;
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if( pndd == NULL ) {
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DBG("%s", "pn532_uart_connect() need an nfc_device_desc_t struct.");
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return NULL;
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} else {
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DBG("Connecting to: %s at %d bauds.",pndd->pcPort, pndd->uiSpeed);
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sp = uart_open(pndd->pcPort);
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if (sp == INVALID_SERIAL_PORT) ERR("Invalid serial port: %s",pndd->pcPort);
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if (sp == CLAIMED_SERIAL_PORT) ERR("Serial port already claimed: %s",pndd->pcPort);
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if ((sp == CLAIMED_SERIAL_PORT) || (sp == INVALID_SERIAL_PORT)) return NULL;
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uart_set_speed(sp, pndd->uiSpeed);
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}
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uart_send(sp, pncmd_pn532c106_wakeup, sizeof(pncmd_pn532c106_wakeup));
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if (!uart_receive(sp,abtRxBuf,&szRxBufLen)) {
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ERR("%s", "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",pndd->pcPort);
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// We have a connection
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pnd = malloc(sizeof(nfc_device_t));
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strncpy(pnd->acName, pndd->acDevice, DEVICE_NAME_LENGTH - 1);
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pnd->acName[DEVICE_NAME_LENGTH - 1] = '\0';
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pnd->nc = NC_PN532;
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pnd->nds = (nfc_device_spec_t)sp;
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pnd->bActive = true;
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pnd->bCrc = true;
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pnd->bPar = true;
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pnd->ui8TxBits = 0;
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return pnd;
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}
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void pn532_uart_disconnect(nfc_device_t* pnd)
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{
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uart_close((serial_port)pnd->nds);
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free(pnd);
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}
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bool pn532_uart_transceive(const nfc_device_spec_t nds, 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 (!uart_send((serial_port)nds,abtTxBuf,szTxLen+7)) {
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ERR("%s", "Unable to transmit data. (TX)");
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return false;
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}
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if (!uart_receive((serial_port)nds,abtRxBuf,&szRxBufLen)) {
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ERR("%s", "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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