File content as of revision 14:868b0fd4e84a:

/* SPWFInterface Example
 * Copyright (c) 2015 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "SPWFSA01.h"
#include "mbed_debug.h"

#define SPWFSA01_CONNECT_TIMEOUT 15000
#define SPWFSA01_SEND_TIMEOUT    500
#define SPWFSA01_RECV_TIMEOUT    1500//some commands like AT&F/W takes some time to get the result back!
#define SPWFSA01_MISC_TIMEOUT    500

SPWFSA01::SPWFSA01(PinName tx, PinName rx, bool debug)
    : _serial(tx, rx, 1024), _parser(_serial),
      _wakeup(D14, PIN_INPUT, PullNone, 0), _reset(D15, PIN_INPUT, PullNone, 1),
      //PC_12->D15, PC_8->D14 (re-wires needed in-case used, currently not used)
      dbg_on(debug)
      //Pin PC_8 is wakeup pin
      //Pin PA_12 is reset pin
{
    _serial.baud(115200);
    _reset.output();
    _wakeup.output();
    _parser.debugOn(debug);
}

bool SPWFSA01::startup(int mode)
{
    setTimeout(SPWFSA01_RECV_TIMEOUT);
    
    /*Test module before reset*/
    waitSPWFReady();
    /*Reset module*/
    reset();
     
    /*set local echo to 0*/
    if(!(_parser.send("AT+S.SCFG=localecho1,%d\r", 0) && _parser.recv("OK"))) 
        {
            debug_if(dbg_on, "SPWF> error local echo set\r\n");
            return false;
        }   
    /*reset factory settings*/
    if(!(_parser.send("AT&F") && _parser.recv("OK"))) 
        {
            debug_if(dbg_on, "SPWF> error AT&F\r\n");
            return false;
        }

    /*set idle mode (0->idle, 1->STA,3->miniAP, 2->IBSS)*/
    if(!(_parser.send("AT+S.SCFG=wifi_mode,%d\r", mode) && _parser.recv("OK")))
        {
            debug_if(dbg_on, "SPWF> error wifi mode set\r\n");
            return false;
        } 

    /* save current setting in flash */
    if(!(_parser.send("AT&W") && _parser.recv("OK")))
        {
            debug_if(dbg_on, "SPWF> error AT&W\r\n");
            return false;
        }
        
    /*reset again and send AT command and check for result (AT->OK)*/
    reset();
        
    return true;    
}

bool SPWFSA01::hw_reset(void)
{    
    /* reset the pin PC12 */  
    _reset.write(0);
    wait_ms(200);
    _reset.write(1); 
    wait_ms(100);
    return 1;
}

bool SPWFSA01::reset(void)
{
    if(!_parser.send("AT+CFUN=1")) return false;
    while(1) {
        if (_parser.recv("+WIND:32:WiFi Hardware Started\r")) {
            return true;
        }
    }
}

void SPWFSA01::waitSPWFReady(void)
{
    //wait_ms(200);
    while(1) 
        if(_parser.send("AT") && _parser.recv("OK"))
            //till we get OK from AT command
            //printf("\r\nwaiting for reset to complete..\n");
            return;
                
}

/* Security Mode
    None          = 0, 
    WEP           = 1,
    WPA_Personal  = 2,
*/
bool SPWFSA01::connect(const char *ap, const char *passPhrase, int securityMode)
{
    uint32_t n1, n2, n3, n4;
    
    //AT+S.SCFG=wifi_wpa_psk_text,%s\r
    if(!(_parser.send("AT+S.SCFG=wifi_wpa_psk_text,%s", passPhrase) && _parser.recv("OK"))) 
        {
            debug_if(dbg_on, "SPWF> error pass set\r\n");
            return false;
        } 
    //AT+S.SSIDTXT=%s\r
    if(!(_parser.send("AT+S.SSIDTXT=%s", ap) && _parser.recv("OK"))) 
        {
            debug_if(dbg_on, "SPWF> error ssid set\r\n");
            return false;
        }
    //AT+S.SCFG=wifi_priv_mode,%d\r
    if(!(_parser.send("AT+S.SCFG=wifi_priv_mode,%d", securityMode) && _parser.recv("OK"))) 
        {
            debug_if(dbg_on, "SPWF> error security mode set\r\n");
            return false;
        } 
    //"AT+S.SCFG=wifi_mode,%d\r"
    /*set idle mode (0->idle, 1->STA,3->miniAP, 2->IBSS)*/
    if(!(_parser.send("AT+S.SCFG=wifi_mode,%d\r", 1) && _parser.recv("OK")))
        {
            debug_if(dbg_on, "SPWF> error wifi mode set\r\n");
            return false;
        }
    //AT&W
    /* save current setting in flash */
    if(!(_parser.send("AT&W") && _parser.recv("OK")))
        {
            debug_if(dbg_on, "SPWF> error AT&W\r\n");
            return false;
        }
    //reset module
    reset();
    
    while(1)
        if((_parser.recv("+WIND:24:WiFi Up:%u.%u.%u.%u\r",&n1, &n2, &n3, &n4)))
            {
                break;
            }            
        
    return true;
}

bool SPWFSA01::disconnect(void)
{
    //"AT+S.SCFG=wifi_mode,%d\r"
    /*set idle mode (0->idle, 1->STA,3->miniAP, 2->IBSS)*/
    if(!(_parser.send("AT+S.SCFG=wifi_mode,%d\r", 0) && _parser.recv("OK")))
        {
            debug_if(dbg_on, "SPWF> error wifi mode set\r\n");
            return false;
        }
    //AT&W
    /* save current setting in flash */
    if(!(_parser.send("AT&W") && _parser.recv("OK")))
        {
            debug_if(dbg_on, "SPWF> error AT&W\r\n");
            return false;
        }
    //reset module
    reset();
    return true;
}

bool SPWFSA01::dhcp(int mode)
{
    //only 3 valid modes
    //0->off(ip_addr must be set by user), 1->on(auto set by AP), 2->on&customize(miniAP ip_addr can be set by user)
    if(mode < 0 || mode > 2) {
        return false;
    }
        
    return _parser.send("AT+S.SCFG=ip_use_dhcp,%d\r", mode)
        && _parser.recv("OK");
}


const char *SPWFSA01::getIPAddress(void)
{
    uint32_t n1, n2, n3, n4;
    
    if (!(_parser.send("AT+S.STS=ip_ipaddr")
        && _parser.recv("#  ip_ipaddr = %u.%u.%u.%u", &n1, &n2, &n3, &n4)
        && _parser.recv("OK"))) {
            debug_if(dbg_on, "SPWF> getIPAddress error\r\n");
        return 0;
    }

    sprintf((char*)_ip_buffer,"%u.%u.%u.%u", n1, n2, n3, n4);

    return _ip_buffer;
}

const char *SPWFSA01::getMACAddress(void)
{
    uint32_t n1, n2, n3, n4, n5, n6;
    
    if (!(_parser.send("AT+S.GCFG=nv_wifi_macaddr")
        && _parser.recv("#  nv_wifi_macaddr = %x:%x:%x:%x:%x:%x", &n1, &n2, &n3, &n4, &n5, &n6)
        && _parser.recv("OK"))) {
            debug_if(dbg_on, "SPWF> getMACAddress error\r\n");
        return 0;
    }

    sprintf((char*)_mac_buffer,"%02X:%02X:%02X:%02X:%02X:%02X", n1, n2, n3, n4, n5, n6);

    return _mac_buffer;
}

bool SPWFSA01::isConnected(void)
{
    return getIPAddress() != 0;
}

bool SPWFSA01::open(const char *type, int* id, const char* addr, int port)
{
    Timer timer;
    timer.start();
    
    if(!_parser.send("AT+S.SOCKON=%s,%d,%s,ind", addr, port, type))
        {
            debug_if(dbg_on, "SPWF> error opening socket\r\n");
            return false;
        }
        
    while(1)
        {
            if( _parser.recv(" ID: %d", id)
                && _parser.recv("OK"))
                break;
            
            if (timer.read_ms() > SPWFSA01_CONNECT_TIMEOUT) {
                return false;
            }
        
            //TODO:implement time-out functionality in case of no response
            //if(timeout) return false;
            //TODO: deal with errors like "ERROR: Failed to resolve name"
            //TODO: deal with errors like "ERROR: Data mode not available"
        }

    return true;
}

bool SPWFSA01::send(int id, const void *data, uint32_t amount)
{    
    char _buf[18];
    
    setTimeout(SPWFSA01_SEND_TIMEOUT);
    
    sprintf((char*)_buf,"AT+S.SOCKW=%d,%d\r", id, amount);   
    
    //May take a second try if device is busy
    for (unsigned i = 0; i < 2; i++) {
        if (_parser.write((char*)_buf, strlen(_buf)) >=0
            && _parser.write((char*)data, (int)amount) >= 0
            && _parser.recv("OK")) {
            return true;
        }
    }

    return false;
}

int32_t SPWFSA01::recv(int id, void *data, uint32_t amount)
{
    uint32_t recv_amount, read_amt;
    int recv_id;
    char _buf[18];

    if (!(_parser.recv("+WIND:55:Pending Data:%d:%u", &recv_id, &recv_amount)
        && recv_id == id        
        //&& _parser.send("AT+S.SOCKQ=%d", id)//send a query (will be required for secure sockets)
        //&& _parser.recv(" DATALEN: %u", &recv_amount)
        //&& _parser.recv("OK")
        && recv_amount <= amount)) {
            return -1;//Block call
            }
    //&& sprintf((char*)_buf,"AT+S.SOCKR=%d,%d\r", id, recv_amount)
    //&& _parser.write((char*)_buf, strlen(_buf))
    if (!_parser.send("AT+S.SOCKR=%d,%d", id, recv_amount)) {
        //if error, resend SOCKR again to flush the socket
        //This should prevent Error: Pending Data errors or the next WIND showing this pending data
        sprintf((char*)_buf,"AT+S.SOCKR=%d,%d\r", id, recv_amount);
        _parser.write((char*)_buf, strlen(_buf));
        debug_if(dbg_on, "SPWF> read send SOCKR error\r\n");
        return -2;//return NSAPI_ERROR_DEVICE_ERROR
        }
            
    read_amt = _parser.read((char*)data, recv_amount);            
    if (read_amt<=0) {        
        debug_if(dbg_on, "SPWF> read recv SOCKR error: read_amt = %d\r\n", read_amt);
        return -2;//return NSAPI_ERROR_DEVICE_ERROR
    }
        
    //Sometimes OK is not received because _parser.read() reads in ERROR statement. "E.g. ERROR: Command not found".
    //ERROR statement hence takes up space in recv_amount and hence OK is not read as a result.
    
    if (!_parser.recv("OK")) {            
        debug_if(dbg_on, "SPWF> read recv SOCKR OK error\r\n");
        
        if(std::strncmp("\r\nERROR: ", (const char* )data, 9)==0) {
            debug_if(dbg_on, "SPWF> Module Error Reply\r\n");
            return -2;
            }
        
        /*int i = 0;
        char * buf = (char*)data;
        
        for ( ; i < recv_amount; i++) {
            debug_if(dbg_on, ("%d = %c\r\n", i, buf[i]);
            }*/
        return -2;//return NSAPI_ERROR_DEVICE_ERROR
    }
    
    return recv_amount;
}

bool SPWFSA01::close(int id)
{
    //May take a second try if device is busy or error is returned
    for (unsigned i = 0; i < 2; i++) {
        if (_parser.send("AT+S.SOCKC=%d", id)
            && _parser.recv("OK")) {
            return true;
        }
        else
            {
                if(_parser.recv("ERROR: Pending data"))
                    debug_if(dbg_on, "SPWF> ERROR!!!!\r\n");
                    return false;
                }
        //TODO: Deal with "ERROR: Pending data" (Closing a socket with pending data)
    }

    return false;
}

void SPWFSA01::setTimeout(uint32_t timeout_ms)
{
    _parser.setTimeout(timeout_ms);
}

bool SPWFSA01::readable()
{
    return _serial.readable();
}

bool SPWFSA01::writeable()
{
    return _serial.writeable();
}