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<h1>pn53x_usb.c</h1> </div>
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<a href="pn53x__usb_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-</span>
<a name="l00002"></a>00002 <span class="comment"> * Public platform independent Near Field Communication (NFC) library</span>
<a name="l00003"></a>00003 <span class="comment"> * </span>
<a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2009, Roel Verdult</span>
<a name="l00005"></a>00005 <span class="comment"> * Copyright (C) 2010, Romain Tartière, Romuald Conty</span>
<a name="l00006"></a>00006 <span class="comment"> * </span>
<a name="l00007"></a>00007 <span class="comment"> * This program is free software: you can redistribute it and/or modify it</span>
<a name="l00008"></a>00008 <span class="comment"> * under the terms of the GNU Lesser General Public License as published by the</span>
<a name="l00009"></a>00009 <span class="comment"> * Free Software Foundation, either version 3 of the License, or (at your</span>
<a name="l00010"></a>00010 <span class="comment"> * option) any later version.</span>
<a name="l00011"></a>00011 <span class="comment"> * </span>
<a name="l00012"></a>00012 <span class="comment"> * This program is distributed in the hope that it will be useful, but WITHOUT</span>
<a name="l00013"></a>00013 <span class="comment"> * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span>
<a name="l00014"></a>00014 <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for</span>
<a name="l00015"></a>00015 <span class="comment"> * more details.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU Lesser General Public License</span>
<a name="l00018"></a>00018 <span class="comment"> * along with this program. If not, see <http://www.gnu.org/licenses/></span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020
<a name="l00026"></a>00026 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor"># include "config.h"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#endif // HAVE_CONFIG_H</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030 <span class="comment">/*</span>
<a name="l00031"></a>00031 <span class="comment">Thanks to d18c7db and Okko for example code</span>
<a name="l00032"></a>00032 <span class="comment">*/</span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="preprocessor">#include <stdio.h></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include <usb.h></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <string.h></span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="drivers_8h.html" title="Supported drivers header.">../drivers.h</a>"</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include "<a class="code" href="pn53x_8h.html" title="PN531, PN532 and PN533 common functions.">../chips/pn53x.h</a>"</span>
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="preprocessor">#include <nfc/nfc.h></span>
<a name="l00043"></a>00043 <span class="preprocessor">#include <nfc/nfc-messages.h></span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="preprocessor">#define BUFFER_LENGTH 256</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span><span class="preprocessor">#define USB_TIMEOUT 0</span>
<a name="l00047"></a>00047 <span class="preprocessor"></span>
<a name="l00048"></a>00048 <span class="comment">// TODO Move this HACK1 into an upper level in order to benefit to other devices that use PN53x</span>
<a name="l00049"></a>00049 <span class="keyword">static</span> <span class="keyword">const</span> byte_t ack_frame[] = { 0x00, 0x00, 0xff, 0x00, 0xff, 0x00 };
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="keywordtype">void</span> pn53x_usb_ack (<a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> * pnd);
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="comment">// Find transfer endpoints for bulk transfers</span>
<a name="l00054"></a>00054 <span class="keywordtype">void</span>
<a name="l00055"></a>00055 get_end_points (<span class="keyword">struct</span> usb_device *dev, usb_spec_t * pus)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 uint32_t uiIndex;
<a name="l00058"></a>00058 uint32_t uiEndPoint;
<a name="l00059"></a>00059 <span class="keyword">struct </span>usb_interface_descriptor *puid = dev->config->interface->altsetting;
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// 3 Endpoints maximum: Interrupt In, Bulk In, Bulk Out</span>
<a name="l00062"></a>00062 <span class="keywordflow">for</span> (uiIndex = 0; uiIndex < puid->bNumEndpoints; uiIndex++) {
<a name="l00063"></a>00063 <span class="comment">// Only accept bulk transfer endpoints (ignore interrupt endpoints)</span>
<a name="l00064"></a>00064 <span class="keywordflow">if</span> (puid->endpoint[uiIndex].bmAttributes != USB_ENDPOINT_TYPE_BULK)
<a name="l00065"></a>00065 <span class="keywordflow">continue</span>;
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="comment">// Copy the endpoint to a local var, makes it more readable code</span>
<a name="l00068"></a>00068 uiEndPoint = puid->endpoint[uiIndex].bEndpointAddress;
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="comment">// Test if we dealing with a bulk IN endpoint</span>
<a name="l00071"></a>00071 <span class="keywordflow">if</span> ((uiEndPoint & USB_ENDPOINT_DIR_MASK) == USB_ENDPOINT_IN) {
<a name="l00072"></a>00072 pus->uiEndPointIn = uiEndPoint;
<a name="l00073"></a>00073 pus->wMaxPacketSize = puid->endpoint[uiIndex].wMaxPacketSize;
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075 <span class="comment">// Test if we dealing with a bulk OUT endpoint</span>
<a name="l00076"></a>00076 <span class="keywordflow">if</span> ((uiEndPoint & USB_ENDPOINT_DIR_MASK) == USB_ENDPOINT_OUT) {
<a name="l00077"></a>00077 pus->uiEndPointOut = uiEndPoint;
<a name="l00078"></a>00078 pus->wMaxPacketSize = puid->endpoint[uiIndex].wMaxPacketSize;
<a name="l00079"></a>00079 }
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordtype">bool</span>
<a name="l00084"></a>00084 pn53x_usb_list_devices (<a class="code" href="structnfc__device__desc__t.html" title="NFC device description.">nfc_device_desc_t</a> pnddDevices[], <span class="keywordtype">size_t</span> szDevices, <span class="keywordtype">size_t</span> * pszDeviceFound,
<a name="l00085"></a>00085 usb_candidate_t candidates[], <span class="keywordtype">int</span> num_candidates, <span class="keywordtype">char</span> *target_name)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 <span class="keywordtype">int</span> ret,
<a name="l00088"></a>00088 i;
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="keyword">struct </span>usb_bus *bus;
<a name="l00091"></a>00091 <span class="keyword">struct </span>usb_device *dev;
<a name="l00092"></a>00092 usb_dev_handle *udev;
<a name="l00093"></a>00093 uint32_t uiBusIndex = 0;
<a name="l00094"></a>00094 <span class="keywordtype">char</span> <span class="keywordtype">string</span>[256];
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="keywordtype">string</span>[0] = <span class="charliteral">'\0'</span>;
<a name="l00097"></a>00097 usb_init ();
<a name="l00098"></a>00098
<a name="l00099"></a>00099 <span class="comment">// usb_find_busses will find all of the busses on the system. Returns the number of changes since previous call to this function (total of new busses and busses removed).</span>
<a name="l00100"></a>00100 <span class="keywordflow">if</span> ((ret = usb_find_busses () < 0))
<a name="l00101"></a>00101 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00102"></a>00102 <span class="comment">// usb_find_devices will find all of the devices on each bus. This should be called after usb_find_busses. Returns the number of changes since the previous call to this function (total of new device and devices removed).</span>
<a name="l00103"></a>00103 <span class="keywordflow">if</span> ((ret = usb_find_devices () < 0))
<a name="l00104"></a>00104 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00105"></a>00105
<a name="l00106"></a>00106 *pszDeviceFound = 0;
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="keywordflow">for</span> (bus = usb_get_busses (); bus; bus = bus->next) {
<a name="l00109"></a>00109 <span class="keywordflow">for</span> (dev = bus->devices; dev; dev = dev->next, uiBusIndex++) {
<a name="l00110"></a>00110 <span class="keywordflow">for</span> (i = 0; i < num_candidates; ++i) {
<a name="l00111"></a>00111 <span class="comment">// DBG("Checking device %04x:%04x (%04x:%04x)",dev->descriptor.idVendor,dev->descriptor.idProduct,candidates[i].idVendor,candidates[i].idProduct);</span>
<a name="l00112"></a>00112 <span class="keywordflow">if</span> (candidates[i].idVendor == dev->descriptor.idVendor && candidates[i].idProduct == dev->descriptor.idProduct) {
<a name="l00113"></a>00113 <span class="comment">// Make sure there are 2 endpoints available</span>
<a name="l00114"></a>00114 <span class="comment">// with libusb-win32 we got some null pointers so be robust before looking at endpoints:</span>
<a name="l00115"></a>00115 <span class="keywordflow">if</span> (dev->config == NULL || dev->config->interface == NULL || dev->config->interface->altsetting == NULL) {
<a name="l00116"></a>00116 <span class="comment">// Nope, we maybe want the next one, let's try to find another</span>
<a name="l00117"></a>00117 <span class="keywordflow">continue</span>;
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 <span class="keywordflow">if</span> (dev->config->interface->altsetting->bNumEndpoints < 2) {
<a name="l00120"></a>00120 <span class="comment">// Nope, we maybe want the next one, let's try to find another</span>
<a name="l00121"></a>00121 <span class="keywordflow">continue</span>;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 <span class="keywordflow">if</span> (dev->descriptor.iManufacturer || dev->descriptor.iProduct) {
<a name="l00124"></a>00124 udev = usb_open (dev);
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (udev) {
<a name="l00126"></a>00126 usb_get_string_simple (udev, dev->descriptor.iManufacturer, <span class="keywordtype">string</span>, sizeof (<span class="keywordtype">string</span>));
<a name="l00127"></a>00127 <span class="keywordflow">if</span> (strlen (<span class="keywordtype">string</span>) > 0)
<a name="l00128"></a>00128 strcpy (<span class="keywordtype">string</span> + strlen (<span class="keywordtype">string</span>), <span class="stringliteral">" / "</span>);
<a name="l00129"></a>00129 usb_get_string_simple (udev, dev->descriptor.iProduct, <span class="keywordtype">string</span> + strlen (<span class="keywordtype">string</span>),
<a name="l00130"></a>00130 <span class="keyword">sizeof</span> (<span class="keywordtype">string</span>) - strlen (<span class="keywordtype">string</span>));
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 usb_close (udev);
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 <span class="keywordflow">if</span> (strlen (<span class="keywordtype">string</span>) == 0)
<a name="l00135"></a>00135 strcpy (pnddDevices[*pszDeviceFound].acDevice, target_name);
<a name="l00136"></a>00136 <span class="keywordflow">else</span>
<a name="l00137"></a>00137 strcpy (pnddDevices[*pszDeviceFound].acDevice, <span class="keywordtype">string</span>);
<a name="l00138"></a>00138 pnddDevices[*pszDeviceFound].<a class="code" href="structnfc__device__desc__t.html#abbe6b78fa97f57c5a240317a34a990bd">pcDriver</a> = target_name;
<a name="l00139"></a>00139 pnddDevices[*pszDeviceFound].<a class="code" href="structnfc__device__desc__t.html#af2fe0f75c77c5e454486be619423c5d9">uiBusIndex</a> = uiBusIndex;
<a name="l00140"></a>00140 (*pszDeviceFound)++;
<a name="l00141"></a>00141 <span class="comment">// Test if we reach the maximum "wanted" devices</span>
<a name="l00142"></a>00142 <span class="keywordflow">if</span> ((*pszDeviceFound) == szDevices) {
<a name="l00143"></a>00143 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149 <span class="keywordflow">if</span> (*pszDeviceFound)
<a name="l00150"></a>00150 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00151"></a>00151 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> *
<a name="l00155"></a>00155 pn53x_usb_connect (<span class="keyword">const</span> <a class="code" href="structnfc__device__desc__t.html" title="NFC device description.">nfc_device_desc_t</a> * pndd, <span class="keyword">const</span> <span class="keywordtype">char</span> *target_name, <span class="keywordtype">int</span> target_chip)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> *pnd = NULL;
<a name="l00158"></a>00158 usb_spec_t *pus;
<a name="l00159"></a>00159 usb_spec_t us;
<a name="l00160"></a>00160 <span class="keyword">struct </span>usb_bus *bus;
<a name="l00161"></a>00161 <span class="keyword">struct </span>usb_device *dev;
<a name="l00162"></a>00162 uint32_t uiBusIndex;
<a name="l00163"></a>00163
<a name="l00164"></a>00164 us.uiEndPointIn = 0;
<a name="l00165"></a>00165 us.uiEndPointOut = 0;
<a name="l00166"></a>00166 us.pudh = NULL;
<a name="l00167"></a>00167
<a name="l00168"></a>00168 DBG (<span class="stringliteral">"Attempt to connect to %s device"</span>, target_name);
<a name="l00169"></a>00169 usb_init ();
<a name="l00170"></a>00170
<a name="l00171"></a>00171 uiBusIndex = pndd-><a class="code" href="structnfc__device__desc__t.html#af2fe0f75c77c5e454486be619423c5d9">uiBusIndex</a>;
<a name="l00172"></a>00172
<a name="l00173"></a>00173 <span class="keywordflow">for</span> (bus = usb_get_busses (); bus; bus = bus->next) {
<a name="l00174"></a>00174 <span class="keywordflow">for</span> (dev = bus->devices; dev; dev = dev->next, uiBusIndex--) {
<a name="l00175"></a>00175 DBG (<span class="stringliteral">"Checking device %04x:%04x"</span>, dev->descriptor.idVendor, dev->descriptor.idProduct);
<a name="l00176"></a>00176 <span class="keywordflow">if</span> (uiBusIndex == 0) {
<a name="l00177"></a>00177 <span class="comment">// Open the USB device</span>
<a name="l00178"></a>00178 us.pudh = usb_open (dev);
<a name="l00179"></a>00179
<a name="l00180"></a>00180 get_end_points (dev, &us);
<a name="l00181"></a>00181 <span class="keywordflow">if</span> (usb_set_configuration (us.pudh, 1) < 0) {
<a name="l00182"></a>00182 ERR (<span class="stringliteral">"Unable to set USB configuration, please check USB permissions for device %04x:%04x"</span>, dev->descriptor.idVendor, dev->descriptor.idProduct);
<a name="l00183"></a>00183 usb_close (us.pudh);
<a name="l00184"></a>00184 <span class="comment">// we failed to use the specified device</span>
<a name="l00185"></a>00185 <span class="keywordflow">return</span> NULL;
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="keywordflow">if</span> (usb_claim_interface (us.pudh, 0) < 0) {
<a name="l00189"></a>00189 DBG (<span class="stringliteral">"%s"</span>, <span class="stringliteral">"Can't claim interface"</span>);
<a name="l00190"></a>00190 usb_close (us.pudh);
<a name="l00191"></a>00191 <span class="comment">// we failed to use the specified device</span>
<a name="l00192"></a>00192 <span class="keywordflow">return</span> NULL;
<a name="l00193"></a>00193 }
<a name="l00194"></a>00194 <span class="comment">// Copy VendorId and ProductId</span>
<a name="l00195"></a>00195 us.uc.idVendor = dev->descriptor.idVendor;
<a name="l00196"></a>00196 us.uc.idProduct = dev->descriptor.idProduct;
<a name="l00197"></a>00197 <span class="comment">// Allocate memory for the device info and specification, fill it and return the info</span>
<a name="l00198"></a>00198 pus = malloc (<span class="keyword">sizeof</span> (usb_spec_t));
<a name="l00199"></a>00199 *pus = us;
<a name="l00200"></a>00200 pnd = malloc (<span class="keyword">sizeof</span> (<a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a>));
<a name="l00201"></a>00201 strcpy (pnd-><a class="code" href="structnfc__device__t.html#a3933f0bea196fedca0345a7f940dc85b">acName</a>, target_name);
<a name="l00202"></a>00202 pnd-><a class="code" href="structnfc__device__t.html#ac38d710f875a0ffbee062569f513dfff">nc</a> = target_chip;
<a name="l00203"></a>00203 pnd-><a class="code" href="structnfc__device__t.html#a2cef5cf7a0f7590c2398bac39bef7bee">nds</a> = (nfc_device_spec_t) pus;
<a name="l00204"></a>00204 pnd-><a class="code" href="structnfc__device__t.html#ae89fdb258019e1c68073c31acc8a1367">bActive</a> = <span class="keyword">true</span>;
<a name="l00205"></a>00205
<a name="l00206"></a>00206 <span class="comment">// HACK1: Send first an ACK as Abort command, to reset chip before talking to it:</span>
<a name="l00207"></a>00207 pn53x_usb_ack (pnd);
<a name="l00208"></a>00208
<a name="l00209"></a>00209 <span class="comment">// HACK2: Then send a GetFirmware command to resync USB toggle bit between host & device</span>
<a name="l00210"></a>00210 <span class="comment">// in case host used set_configuration and expects the device to have reset its toggle bit, which PN53x doesn't do</span>
<a name="l00211"></a>00211 byte_t abtTx[] = { 0x00, 0x00, 0xff, 0x02, 0xfe, 0xd4, 0x02, 0x2a, 0x00 };
<a name="l00212"></a>00212 byte_t abtRx[BUFFER_LENGTH];
<a name="l00213"></a>00213 <span class="keywordtype">int</span> ret;
<a name="l00214"></a>00214 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00215"></a>00215 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"TX"</span>, abtTx, <span class="keyword">sizeof</span>(abtTx));
<a name="l00216"></a>00216 <span class="preprocessor">#endif</span>
<a name="l00217"></a>00217 <span class="preprocessor"></span> ret = usb_bulk_write (pus->pudh, pus->uiEndPointOut, (<span class="keywordtype">char</span> *) abtTx, <span class="keyword">sizeof</span>(abtTx), USB_TIMEOUT);
<a name="l00218"></a>00218 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00219"></a>00219 DBG (<span class="stringliteral">"usb_bulk_write failed with error %d"</span>, ret);
<a name="l00220"></a>00220 usb_close (us.pudh);
<a name="l00221"></a>00221 <span class="comment">// we failed to use the specified device</span>
<a name="l00222"></a>00222 <span class="keywordflow">return</span> NULL;
<a name="l00223"></a>00223 }
<a name="l00224"></a>00224 ret = usb_bulk_read (pus->pudh, pus->uiEndPointIn, (<span class="keywordtype">char</span> *) abtRx, BUFFER_LENGTH, USB_TIMEOUT);
<a name="l00225"></a>00225 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00226"></a>00226 DBG (<span class="stringliteral">"usb_bulk_read failed with error %d"</span>, ret);
<a name="l00227"></a>00227 usb_close (us.pudh);
<a name="l00228"></a>00228 <span class="comment">// we failed to use the specified device</span>
<a name="l00229"></a>00229 <span class="keywordflow">return</span> NULL;
<a name="l00230"></a>00230 }
<a name="l00231"></a>00231 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00232"></a>00232 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"RX"</span>, abtRx, ret);
<a name="l00233"></a>00233 <span class="preprocessor">#endif</span>
<a name="l00234"></a>00234 <span class="preprocessor"></span> <span class="keywordflow">if</span> (ret == 6) { <span class="comment">// we got the ACK/NACK properly</span>
<a name="l00235"></a>00235 <span class="keywordflow">if</span> (!pn53x_check_ack_frame_callback (pnd, abtRx, ret)) {
<a name="l00236"></a>00236 DBG (<span class="stringliteral">"usb_bulk_read failed getting ACK"</span>);
<a name="l00237"></a>00237 usb_close (us.pudh);
<a name="l00238"></a>00238 <span class="comment">// we failed to use the specified device</span>
<a name="l00239"></a>00239 <span class="keywordflow">return</span> NULL;
<a name="l00240"></a>00240 }
<a name="l00241"></a>00241 ret = usb_bulk_read (pus->pudh, pus->uiEndPointIn, (<span class="keywordtype">char</span> *) abtRx, BUFFER_LENGTH, USB_TIMEOUT);
<a name="l00242"></a>00242 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00243"></a>00243 DBG (<span class="stringliteral">"usb_bulk_read failed with error %d"</span>, ret);
<a name="l00244"></a>00244 usb_close (us.pudh);
<a name="l00245"></a>00245 <span class="comment">// we failed to use the specified device</span>
<a name="l00246"></a>00246 <span class="keywordflow">return</span> NULL;
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00249"></a>00249 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"RX"</span>, abtRx, ret);
<a name="l00250"></a>00250 <span class="preprocessor">#endif</span>
<a name="l00251"></a>00251 <span class="preprocessor"></span> }
<a name="l00252"></a>00252
<a name="l00253"></a>00253 <span class="keywordflow">return</span> pnd;
<a name="l00254"></a>00254 }
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 }
<a name="l00257"></a>00257 <span class="comment">// We ran out of devices before the index required</span>
<a name="l00258"></a>00258 DBG (<span class="stringliteral">"%s"</span>, <span class="stringliteral">"Device index not found!"</span>);
<a name="l00259"></a>00259 <span class="keywordflow">return</span> NULL;
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261
<a name="l00262"></a>00262 <span class="keywordtype">void</span>
<a name="l00263"></a>00263 pn53x_usb_disconnect (<a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> * pnd)
<a name="l00264"></a>00264 {
<a name="l00265"></a>00265 usb_spec_t *pus = (usb_spec_t *) pnd-><a class="code" href="structnfc__device__t.html#a2cef5cf7a0f7590c2398bac39bef7bee">nds</a>;
<a name="l00266"></a>00266 <span class="keywordtype">int</span> ret;
<a name="l00267"></a>00267
<a name="l00268"></a>00268 pn53x_usb_ack (pnd);
<a name="l00269"></a>00269
<a name="l00270"></a>00270 <span class="keywordflow">if</span> ((ret = usb_release_interface (pus->pudh, 0)) < 0) {
<a name="l00271"></a>00271 ERR (<span class="stringliteral">"usb_release_interface failed (%i)"</span>, ret);
<a name="l00272"></a>00272 }
<a name="l00273"></a>00273
<a name="l00274"></a>00274 <span class="keywordflow">if</span> ((ret = usb_close (pus->pudh)) < 0) {
<a name="l00275"></a>00275 ERR (<span class="stringliteral">"usb_close failed (%i)"</span>, ret);
<a name="l00276"></a>00276 }
<a name="l00277"></a>00277 <span class="comment">/* </span>
<a name="l00278"></a>00278 <span class="comment"> if((ret = usb_reset(pus->pudh)) < 0) {</span>
<a name="l00279"></a>00279 <span class="comment"> ERR("usb_reset failed (%i, if errno: %s)",ret, strerror(-ret));</span>
<a name="l00280"></a>00280 <span class="comment"> }</span>
<a name="l00281"></a>00281 <span class="comment">*/</span>
<a name="l00282"></a>00282 free (pnd-><a class="code" href="structnfc__device__t.html#a2cef5cf7a0f7590c2398bac39bef7bee">nds</a>);
<a name="l00283"></a>00283 free (pnd);
<a name="l00284"></a>00284 }
<a name="l00285"></a>00285
<a name="l00286"></a>00286 <span class="keywordtype">bool</span>
<a name="l00287"></a>00287 pn53x_usb_transceive (<a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> * pnd, <span class="keyword">const</span> byte_t * pbtTx, <span class="keyword">const</span> <span class="keywordtype">size_t</span> szTx, byte_t * pbtRx, <span class="keywordtype">size_t</span> * pszRx)
<a name="l00288"></a>00288 {
<a name="l00289"></a>00289 <span class="keywordtype">size_t</span> uiPos = 0;
<a name="l00290"></a>00290 <span class="keywordtype">int</span> ret = 0;
<a name="l00291"></a>00291 byte_t abtTx[BUFFER_LENGTH] = { 0x00, 0x00, 0xff }; <span class="comment">// Every packet must start with "00 00 ff"</span>
<a name="l00292"></a>00292 byte_t abtRx[BUFFER_LENGTH];
<a name="l00293"></a>00293 usb_spec_t *pus = (usb_spec_t *) pnd-><a class="code" href="structnfc__device__t.html#a2cef5cf7a0f7590c2398bac39bef7bee">nds</a>;
<a name="l00294"></a>00294 <span class="comment">// TODO: Move this one level up for libnfc-1.6</span>
<a name="l00295"></a>00295 uint8_t ack_frame[] = { 0x00, 0x00, 0xff, 0x00, 0xff, 0x00 };
<a name="l00296"></a>00296
<a name="l00297"></a>00297 <span class="comment">// Packet length = data length (len) + checksum (1) + end of stream marker (1)</span>
<a name="l00298"></a>00298 abtTx[3] = szTx;
<a name="l00299"></a>00299 <span class="comment">// Packet length checksum </span>
<a name="l00300"></a>00300 abtTx[4] = 0x0100 - abtTx[3];
<a name="l00301"></a>00301 <span class="comment">// Copy the PN53X command into the packet abtTx</span>
<a name="l00302"></a>00302 memmove (abtTx + 5, pbtTx, szTx);
<a name="l00303"></a>00303
<a name="l00304"></a>00304 <span class="comment">// Calculate data payload checksum</span>
<a name="l00305"></a>00305 abtTx[szTx + 5] = 0;
<a name="l00306"></a>00306 <span class="keywordflow">for</span> (uiPos = 0; uiPos < szTx; uiPos++) {
<a name="l00307"></a>00307 abtTx[szTx + 5] -= abtTx[uiPos + 5];
<a name="l00308"></a>00308 }
<a name="l00309"></a>00309
<a name="l00310"></a>00310 <span class="comment">// End of stream marker</span>
<a name="l00311"></a>00311 abtTx[szTx + 6] = 0;
<a name="l00312"></a>00312
<a name="l00313"></a>00313 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00314"></a>00314 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"TX"</span>, abtTx, szTx + 7);
<a name="l00315"></a>00315 <span class="preprocessor">#endif</span>
<a name="l00316"></a>00316 <span class="preprocessor"></span>
<a name="l00317"></a>00317 ret = usb_bulk_write (pus->pudh, pus->uiEndPointOut, (<span class="keywordtype">char</span> *) abtTx, szTx + 7, USB_TIMEOUT);
<a name="l00318"></a>00318 <span class="comment">// HACK This little hack is a well know problem of USB, see http://www.libusb.org/ticket/6 for more details</span>
<a name="l00319"></a>00319 <span class="keywordflow">if</span> ((ret % pus->wMaxPacketSize) == 0) {
<a name="l00320"></a>00320 usb_bulk_write (pus->pudh, pus->uiEndPointOut, <span class="stringliteral">"\0"</span>, 0, USB_TIMEOUT);
<a name="l00321"></a>00321 }
<a name="l00322"></a>00322
<a name="l00323"></a>00323 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00324"></a>00324 DBG (<span class="stringliteral">"usb_bulk_write failed with error %d"</span>, ret);
<a name="l00325"></a>00325 pnd-><a class="code" href="structnfc__device__t.html#a3cc2631649285ff97395e20d8abd1e6f">iLastError</a> = DEIO;
<a name="l00326"></a>00326 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00327"></a>00327 }
<a name="l00328"></a>00328
<a name="l00329"></a>00329 ret = usb_bulk_read (pus->pudh, pus->uiEndPointIn, (<span class="keywordtype">char</span> *) abtRx, BUFFER_LENGTH, USB_TIMEOUT);
<a name="l00330"></a>00330 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00331"></a>00331 DBG (<span class="stringliteral">"usb_bulk_read failed with error %d"</span>, ret);
<a name="l00332"></a>00332 pnd-><a class="code" href="structnfc__device__t.html#a3cc2631649285ff97395e20d8abd1e6f">iLastError</a> = DEIO;
<a name="l00333"></a>00333 <span class="comment">// try to interrupt current device state</span>
<a name="l00334"></a>00334 pn53x_usb_ack(pnd);
<a name="l00335"></a>00335 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00336"></a>00336 }
<a name="l00337"></a>00337 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00338"></a>00338 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"RX"</span>, abtRx, ret);
<a name="l00339"></a>00339 <span class="preprocessor">#endif</span>
<a name="l00340"></a>00340 <span class="preprocessor"></span>
<a name="l00341"></a>00341 <span class="keywordflow">if</span> (!pn53x_check_ack_frame_callback (pnd, abtRx, ret))
<a name="l00342"></a>00342 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00343"></a>00343
<a name="l00344"></a>00344 ret = usb_bulk_read (pus->pudh, pus->uiEndPointIn, (<span class="keywordtype">char</span> *) abtRx, BUFFER_LENGTH, USB_TIMEOUT);
<a name="l00345"></a>00345 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00346"></a>00346 DBG (<span class="stringliteral">"usb_bulk_read failed with error %d"</span>, ret);
<a name="l00347"></a>00347 pnd-><a class="code" href="structnfc__device__t.html#a3cc2631649285ff97395e20d8abd1e6f">iLastError</a> = DEIO;
<a name="l00348"></a>00348 <span class="comment">// try to interrupt current device state</span>
<a name="l00349"></a>00349 pn53x_usb_ack(pnd);
<a name="l00350"></a>00350 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00351"></a>00351 }
<a name="l00352"></a>00352 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00353"></a>00353 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"RX"</span>, abtRx, ret);
<a name="l00354"></a>00354 <span class="preprocessor">#endif</span>
<a name="l00355"></a>00355 <span class="preprocessor"></span>
<a name="l00356"></a>00356 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00357"></a>00357 <span class="preprocessor"></span> PRINT_HEX (<span class="stringliteral">"TX"</span>, ack_frame, 6);
<a name="l00358"></a>00358 <span class="preprocessor">#endif</span>
<a name="l00359"></a>00359 <span class="preprocessor"></span> usb_bulk_write (pus->pudh, pus->uiEndPointOut, (<span class="keywordtype">char</span> *) ack_frame, 6, USB_TIMEOUT);
<a name="l00360"></a>00360
<a name="l00361"></a>00361 <span class="keywordflow">if</span> (!pn53x_check_error_frame_callback (pnd, abtRx, ret))
<a name="l00362"></a>00362 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00363"></a>00363
<a name="l00364"></a>00364 <span class="comment">// When the answer should be ignored, just return a succesful result</span>
<a name="l00365"></a>00365 <span class="keywordflow">if</span> (pbtRx == NULL || pszRx == NULL)
<a name="l00366"></a>00366 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00367"></a>00367
<a name="l00368"></a>00368 <span class="comment">// Only succeed when the result is at least 00 00 FF xx Fx Dx xx .. .. .. xx 00 (x = variable)</span>
<a name="l00369"></a>00369 <span class="keywordflow">if</span> (ret < 9) {
<a name="l00370"></a>00370 DBG (<span class="stringliteral">"%s"</span>, <span class="stringliteral">"No data"</span>);
<a name="l00371"></a>00371 pnd-><a class="code" href="structnfc__device__t.html#a3cc2631649285ff97395e20d8abd1e6f">iLastError</a> = DEINVAL;
<a name="l00372"></a>00372 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00373"></a>00373 }
<a name="l00374"></a>00374 <span class="comment">// Remove the preceding and appending bytes 00 00 FF xx Fx .. .. .. xx 00 (x = variable)</span>
<a name="l00375"></a>00375 *pszRx = ret - 7 - 2;
<a name="l00376"></a>00376
<a name="l00377"></a>00377 memcpy (pbtRx, abtRx + 7, *pszRx);
<a name="l00378"></a>00378
<a name="l00379"></a>00379 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00380"></a>00380 }
<a name="l00381"></a>00381
<a name="l00382"></a>00382 <span class="keywordtype">void</span>
<a name="l00383"></a>00383 pn53x_usb_ack (<a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> * pnd)
<a name="l00384"></a>00384 {
<a name="l00385"></a>00385 usb_spec_t *pus = (usb_spec_t *) pnd-><a class="code" href="structnfc__device__t.html#a2cef5cf7a0f7590c2398bac39bef7bee">nds</a>;
<a name="l00386"></a>00386 #ifdef DEBUG
<a name="l00387"></a>00387 PRINT_HEX (<span class="stringliteral">"TX"</span>, ack_frame, <span class="keyword">sizeof</span> (ack_frame));
<a name="l00388"></a>00388 <span class="preprocessor">#endif</span>
<a name="l00389"></a>00389 <span class="preprocessor"></span> usb_bulk_write (pus->pudh, pus->uiEndPointOut, (<span class="keywordtype">char</span> *) ack_frame, sizeof (ack_frame), USB_TIMEOUT);
<a name="l00390"></a>00390 }
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