IntensityScanner.cpp

00001 #include "IntensityScanner.h"
00002 
00003 IntensityScanner::IntensityScanner (PinName cc3000_irq,
00004     PinName cc3000_en,
00005     PinName cc3000_cs,
00006     SPI cc3000_spi, const char* SSID, const char* key, mbed_cc3000::Security sec, bool smart_config, uint32_t timeout) : wifi(cc3000_irq, cc3000_en,
00007         cc3000_cs, cc3000_spi, SSID, key, sec, smart_config), timeout(timeout) {
00008     wifi.init();
00009     /*
00010     const unsigned long intervalTime[16] = { 2000, 2000, 2000, 2000,  2000,
00011     2000, 2000, 2000, 2000, 2000, 2000, 2000, 2000, 2000, 2000, 2000 };
00012     */
00013 
00014     /*wifi._wlan.ioctl_set_scan_params(timeout, 20, 30, 5,
00015     0x7ff, -80, 0, 205, (uint32_t*) intervalTime);
00016     */
00017     const unsigned long intervalTime[16] = { 200, 200, 200, 200,  200,
00018     200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200 };
00019     wifi._wlan.ioctl_set_scan_params(timeout, 20, 30, 5,
00020         0x400, -80, 0, 205, (uint32_t*) intervalTime);
00021         
00022 };
00023         
00024 
00025 int IntensityScanner::rssi_for_ssid (const char* ssid, uint8_t* rssi) {
00026 
00027     uint8_t scan_buffer[50];
00028     uint8_t rssi_field, ssid_length_field, ssid_length;
00029     char* measured_ssid_name;
00030     
00031     int found_match = 0;
00032     while (!found_match
00033         && wifi._wlan.ioctl_get_scan_results(1000, scan_buffer) == 0) {
00034             
00035         rssi_field = scan_buffer[8];
00036         ssid_length_field = scan_buffer[9];
00037         ssid_length = ssid_length_field & (0x3F);
00038 
00039         measured_ssid_name = (char*) malloc(sizeof(char) * (ssid_length+1));
00040         memcpy(measured_ssid_name, scan_buffer + 12, ssid_length);
00041         measured_ssid_name[ssid_length] = '\0';
00042         
00043         if (strcmp(ssid, measured_ssid_name) == 0) {
00044             
00045             *rssi = (rssi_field & 0x7f);
00046             found_match = 1;
00047         }
00048 
00049         free(measured_ssid_name);
00050     }
00051 
00052     return found_match ? 0 : 1;
00053 }