jollen chen
Improve Wifly Interface
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Diff: Wifly/Wifly.cpp
- Revision:
- 1:fb4494783863
- Child:
- 2:8e54830d0df7
- Child:
- 7:3152fcc74390
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Wifly/Wifly.cpp Fri Aug 24 13:48:36 2012 +0000
@@ -0,0 +1,532 @@
+/* Copyright (C) 2012 mbed.org, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "mbed.h"
+#include "Wifly.h"
+#include <string>
+#include <algorithm>
+
+//Debug is disabled by default
+#if (0 && defined(TARGET_LPC1768))
+#define DBG(x, ...) std::printf("[Wifly : DBG]"x"\r\n", ##__VA_ARGS__);
+#define WARN(x, ...) std::printf("[Wifly : WARN]"x"\r\n", ##__VA_ARGS__);
+#define ERR(x, ...) std::printf("[Wifly : ERR]"x"\r\n", ##__VA_ARGS__);
+#else
+#define DBG(x, ...)
+#define WARN(x, ...)
+#define ERR(x, ...)
+#endif
+
+#if TARGET_LPC1768
+#define INFO(x, ...) printf("[Wifly : INFO]"x"\r\n", ##__VA_ARGS__);
+#else
+#define INFO(x, ...)
+#endif
+
+#define MAX_TRY_JOIN 3
+
+Wifly * Wifly::inst;
+
+Wifly::Wifly( PinName tx, PinName rx, PinName _reset, PinName tcp_status, const char * ssid, const char * phrase, Security sec):
+ wifi(tx, rx), reset_pin(_reset), tcp_status(tcp_status), buf_wifly(256)
+{
+ memset(&state, 0, sizeof(state));
+ state.sec = sec;
+
+ // change all ' ' in '$' in the ssid and the passphrase
+ strcpy(this->ssid, ssid);
+ for (int i = 0; i < strlen(ssid); i++) {
+ if (this->ssid[i] == ' ')
+ this->ssid[i] = '$';
+ }
+ strcpy(this->phrase, phrase);
+ for (int i = 0; i < strlen(phrase); i++) {
+ if (this->phrase[i] == ' ')
+ this->phrase[i] = '$';
+ }
+
+ inst = this;
+ attach_rx(false);
+ state.cmd_mode = false;
+}
+
+bool Wifly::join()
+{
+ char cmd[20];
+
+ for (int i= 0; i < MAX_TRY_JOIN; i++) {
+ // set time
+ if (!sendCommand("set c t 20\r", "AOK"))
+ continue;
+
+ // set size
+ if (!sendCommand("set c s 128\r", "AOK"))
+ continue;
+
+ // red led on when tcp connection active
+ if (!sendCommand("set s i 0x40\r", "AOK"))
+ continue;
+
+ // no string sent to the tcp client
+ if (!sendCommand("set c r 0\r", "AOK"))
+ continue;
+
+ // tcp protocol
+ if (!sendCommand("set i p 2\r", "AOK"))
+ continue;
+
+ // tcp retry
+ if (!sendCommand("set i f 0x7\r", "AOK"))
+ continue;
+
+ //no echo
+ if (!sendCommand("set u m 1\r", "AOK"))
+ continue;
+
+ // no auto join
+ if (!sendCommand("set w j 0\r", "AOK"))
+ continue;
+
+ //dhcp
+ sprintf(cmd, "set i d %d\r", (state.dhcp) ? 1 : 0);
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+
+ // ssid
+ sprintf(cmd, "set w s %s\r", ssid);
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+
+ //auth
+ sprintf(cmd, "set w a %d\r", state.sec);
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+
+ // if no dhcp, set ip, netmask and gateway
+ if (!state.dhcp) {
+ DBG("not dhcp\r");
+
+ sprintf(cmd, "set i a %s\r\n", ip);
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+
+ sprintf(cmd, "set i n %s\r", netmask);
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+
+ sprintf(cmd, "set i g %s\r", gateway);
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+ }
+
+ //key step
+ if (state.sec != NONE) {
+ if (state.sec == WPA)
+ sprintf(cmd, "set w p %s\r", phrase);
+ else if (state.sec == WEP_128)
+ sprintf(cmd, "set w k %s\r", phrase);
+
+ if (!sendCommand(cmd, "AOK"))
+ continue;
+ }
+
+ //join the network
+ sprintf(cmd, "join\r");
+ if (!sendCommand(cmd, "Associated", NULL, 3000))
+ continue;
+
+ if (state.dhcp) {
+ if (!sendCommand("", "DHCP=ON", NULL, 3000))
+ continue;
+ }
+
+ exit();
+
+ state.associated = true;
+ INFO("\r\nssid: %s\r\nphrase: %s\r\nsecurity: %s\r\n\r\n", this->ssid, this->phrase, getStringSecurity());
+ return true;
+ }
+ return false;
+}
+
+
+bool Wifly::setProtocol(Protocol p)
+{
+ // use udp auto pairing
+ char cmd[20];
+ sprintf(cmd, "set i p %d\r", p);
+ if (!sendCommand(cmd, "AOK"))
+ return false;
+
+ switch(p) {
+ case TCP:
+ // set ip flags: tcp retry enabled
+ if (!sendCommand("set i f 0x07\r", "AOK"))
+ return false;
+ break;
+ case UDP:
+ // set ip flags: udp auto pairing enabled
+ if (!sendCommand("set i f 0x40\r", "AOK"))
+ return false;
+ if (!sendCommand("set i h 0.0.0.0\r", "AOK"))
+ return false;
+ if (!sendCommand("set i r 0\r", "AOK"))
+ return false;
+ break;
+ }
+ state.proto = p;
+ return true;
+}
+
+char * Wifly::getStringSecurity()
+{
+ switch(state.sec) {
+ case NONE:
+ return "NONE";
+ case WEP_128:
+ return "WEP_128";
+ case WPA:
+ return "WPA";
+ }
+ return "UNKNOWN";
+}
+
+bool Wifly::connect(const char * host, int port)
+{
+ char rcv[20];
+ char cmd[20];
+
+ // get ip from host and set host
+ if (gethostbyname(host, rcv)) {
+ sprintf(cmd, "set i h %s\r", rcv);
+ if (!sendCommand(cmd, "AOK"))
+ return false;
+ } else {
+ return false;
+ }
+
+ // set port
+ sprintf(cmd, "set i r %d\r", port);
+ if (!sendCommand(cmd, "AOK"))
+ return false;
+
+ // open
+ if (sendCommand("open\r", NULL, rcv)) {
+ if (strstr(rcv, "OPEN") == NULL) {
+ if (strstr(rcv, "Connected") != NULL) {
+ if (!sendCommand("close\r", "CLOS"))
+ return false;
+ if (!sendCommand("open\r", "OPEN"))
+ return false;
+ } else {
+ return false;
+ }
+ }
+ } else {
+ return false;
+ }
+
+ state.tcp = true;
+ state.cmd_mode = false;
+
+ return true;
+}
+
+
+bool Wifly::gethostbyname(const char * host, char * ip)
+{
+ string h = host;
+ char cmd[30], rcv[100];
+ int l = 0;
+ char * point;
+ int nb_digits = 0;
+
+ // no dns needed
+ int pos = h.find(".");
+ if (pos != string::npos) {
+ string sub = h.substr(0, h.find("."));
+ nb_digits = atoi(sub.c_str());
+ }
+ //printf("substrL %s\r\n", sub.c_str());
+ if (count(h.begin(), h.end(), '.') == 3 && nb_digits > 0) {
+ strcpy(ip, host);
+ }
+ // dns needed
+ else {
+ nb_digits = 0;
+ sprintf(cmd, "lookup %s\r", host);
+ if (!sendCommand(cmd, NULL, rcv))
+ return false;
+
+ // look for the ip address
+ char * begin = strstr(rcv, "=") + 1;
+ for (int i = 0; i < 3; i++) {
+ point = strstr(begin + l, ".");
+ DBG("str: %s", begin + l);
+ l += point - (begin + l) + 1;
+ }
+ DBG("str: %s", begin + l);
+ while(*(begin + l + nb_digits) >= '0' && *(begin + l + nb_digits) <= '9') {
+ DBG("digit: %c", *(begin + l + nb_digits));
+ nb_digits++;
+ }
+ memcpy(ip, begin, l + nb_digits);
+ ip[l+nb_digits] = 0;
+ DBG("ip from dns: %s", ip);
+ }
+ return true;
+}
+
+
+void Wifly::flush()
+{
+ buf_wifly.flush();
+}
+
+bool Wifly::sendCommand(const char * cmd, const char * ack, char * res, int timeout)
+{
+ if (!state.cmd_mode) {
+ cmdMode();
+ }
+ if (send(cmd, strlen(cmd), ack, res, timeout) == -1) {
+ ERR("sendCommand: cannot %s\r\n", cmd);
+ exit();
+ return false;
+ }
+ return true;
+}
+
+bool Wifly::cmdMode()
+{
+ // if already in cmd mode, return
+ if (state.cmd_mode)
+ return true;
+
+ if (send("$$$", 3, "CMD") == -1) {
+ ERR("cannot enter in cmd mode\r\n");
+ return false;
+ }
+ state.cmd_mode = true;
+ return true;
+}
+
+bool Wifly::disconnect()
+{
+ // if already disconnected, return
+ if (!state.associated)
+ return true;
+
+ if (!sendCommand("leave\r", "DeAuth"))
+ return false;
+ exit();
+
+ state.associated = false;
+ return true;
+
+}
+
+bool Wifly::is_connected()
+{
+ return (tcp_status.read() == 1) ? true : false;
+}
+
+
+void Wifly::reset()
+{
+ reset_pin = 0;
+ wait(0.2);
+ reset_pin = 1;
+ wait(0.2);
+}
+
+bool Wifly::close()
+{
+ // if not connected, return
+ if (!state.tcp)
+ return true;
+
+ wait(0.25);
+ if (!sendCommand("close\r", "CLOS"))
+ return false;
+ exit();
+
+ state.tcp = false;
+ return true;
+}
+
+
+int Wifly::putc(char c)
+{
+ while (!wifi.writeable());
+ return wifi.putc(c);
+}
+
+
+bool Wifly::exit()
+{
+ flush();
+ if (!state.cmd_mode)
+ return true;
+ if (!sendCommand("exit\r", "EXIT"))
+ return false;
+ state.cmd_mode = false;
+ flush();
+ return true;
+}
+
+
+int Wifly::readable()
+{
+ return buf_wifly.available();
+}
+
+int Wifly::writeable()
+{
+ return wifi.writeable();
+}
+
+char Wifly::getc()
+{
+ char c;
+ while (!buf_wifly.available());
+ buf_wifly.dequeue(&c);
+ return c;
+}
+
+void Wifly::handler_rx(void)
+{
+ //read characters
+ while (wifi.readable())
+ buf_wifly.queue(wifi.getc());
+}
+
+void Wifly::attach_rx(bool callback)
+{
+ if (!callback)
+ wifi.attach(NULL);
+ else
+ wifi.attach(this, &Wifly::handler_rx);
+}
+
+
+int Wifly::send(const char * str, int len, const char * ACK, char * res, int timeout)
+{
+ char read;
+ size_t found = string::npos;
+ string checking;
+ Timer tmr;
+ int result = 0;
+
+ DBG("will send: %s\r\n",str);
+
+ attach_rx(false);
+
+ //We flush the buffer
+ while (wifi.readable())
+ wifi.getc();
+
+ if (!ACK || !strcmp(ACK, "NO")) {
+ for (int i = 0; i < len; i++)
+ result = (putc(str[i]) == str[i]) ? result + 1 : result;
+ } else {
+ //We flush the buffer
+ while (wifi.readable())
+ wifi.getc();
+
+ tmr.start();
+ for (int i = 0; i < len; i++)
+ result = (putc(str[i]) == str[i]) ? result + 1 : result;
+
+ while (1) {
+ if (tmr.read_ms() > timeout) {
+ //We flush the buffer
+ while (wifi.readable())
+ wifi.getc();
+
+ DBG("check: %s\r\n", checking.c_str());
+
+ attach_rx(true);
+ return -1;
+ } else if (wifi.readable()) {
+ read = wifi.getc();
+ if ( read != '\r' && read != '\n') {
+ checking += read;
+ found = checking.find(ACK);
+ if (found != string::npos) {
+ wait(0.01);
+
+ //We flush the buffer
+ while (wifi.readable())
+ wifi.getc();
+
+ break;
+ }
+ }
+ }
+ }
+ DBG("check: %s\r\n", checking.c_str());
+
+ attach_rx(true);
+ return result;
+ }
+
+ //the user wants the result from the command (ACK == NULL, res != NULL)
+ if ( res != NULL) {
+ int i = 0;
+ Timer timeout;
+ timeout.start();
+ tmr.reset();
+ while (1) {
+ if (timeout.read() > 2) {
+ if (i == 0) {
+ res = NULL;
+ break;
+ }
+ res[i] = '\0';
+ DBG("user str 1: %s\r\n", res);
+
+ break;
+ } else {
+ if (tmr.read_ms() > 300) {
+ res[i] = '\0';
+ DBG("user str: %s\r\n", res);
+
+ break;
+ }
+ if (wifi.readable()) {
+ tmr.start();
+ read = wifi.getc();
+
+ // we drop \r and \n
+ if ( read != '\r' && read != '\n') {
+ res[i++] = read;
+ }
+ }
+ }
+ }
+ DBG("user str: %s\r\n", res);
+ }
+
+ //We flush the buffer
+ while (wifi.readable())
+ wifi.getc();
+
+ attach_rx(true);
+ DBG("result: %d\r\n", result)
+ return result;
+}
\ No newline at end of file