tmk_core/protocol/usb_hid/USB_Host_Shield_2.0/examples/HID/scale/scale_rptparser.cpp

   1 /* Parser for standard HID scale (usage page 0x8d) data input report (ID 3) */
   2 #include "scale_rptparser.h"
   3
   4 const char* UNITS[13] = {
   5     "units",        // unknown unit
   6     "mg",           // milligram
   7     "g",            // gram
   8     "kg",           // kilogram
   9     "cd",           // carat
  10     "taels",        // lian
  11     "gr",           // grain
  12     "dwt",          // pennyweight
  13     "tonnes",       // metric tons
  14     "tons",         // avoir ton
  15     "ozt",          // troy ounce
  16     "oz",           // ounce
  17     "lbs"           // pound
  18 };
  19
  20 ScaleReportParser::ScaleReportParser(ScaleEvents *evt) :
  21         scaleEvents(evt)
  22 {}
  23
  24 void ScaleReportParser::Parse(HID *hid, bool is_rpt_id, uint8_t len, uint8_t *buf)
  25 {
  26         bool match = true;
  27
  28         // Checking if there are changes in report since the method was last called
  29         for (uint8_t i=0; i<RPT_SCALE_LEN; i++) {
  30                 if( buf[i] != oldScale[i] ) {
  31                         match = false;
  32                         break;
  33                 }
  34   }
  35         // Calling Game Pad event handler
  36         if (!match && scaleEvents) {
  37                 scaleEvents->OnScaleChanged((const ScaleEventData*)buf);
  38
  39                 for (uint8_t i=0; i<RPT_SCALE_LEN; i++) oldScale[i] = buf[i];
  40         }
  41 }
  42
  43 ScaleEvents::ScaleEvents( Max_LCD* pLCD ) :
  44
  45         pLcd( pLCD )
  46
  47 {}
  48
  49 void ScaleEvents::LcdPrint( const char* str )
  50 {
  51
  52         while( *str ) {
  53
  54                 pLcd->write(    *str++ );
  55
  56         }
  57 }
  58
  59 void ScaleEvents::OnScaleChanged(const ScaleEventData *evt)
  60 {
  61
  62         pLcd->clear();
  63   pLcd->home();
  64   pLcd->setCursor(0,0);
  65
  66         if( evt->reportID != 3 ) {
  67
  68                 const char inv_report[]="Invalid report!";
  69
  70                 Serial.println(inv_report);
  71                 LcdPrint(inv_report);
  72
  73                 return;
  74
  75         }//if( evt->reportID != 3...
  76
  77         switch( evt->status ) {
  78
  79                 case REPORT_FAULT:
  80                         Serial.println(F("Report fault"));
  81                         break;
  82
  83                 case ZEROED:
  84                         Serial.println(F("Scale zero set"));
  85                         break;
  86
  87                 case WEIGHING: {
  88
  89                         const char progress[] = "Weighing...";
  90                         Serial.println(progress);
  91                         LcdPrint(progress);
  92                         break;
  93                 }
  94
  95                 case WEIGHT_VALID: {
  96
  97                         char buf[10];
  98       double weight = evt->weight * pow( 10, evt->exp );
  99
 100
 101
 102         Serial.print(F("Weight: "));
 103                                 Serial.print( weight );
 104                                 Serial.print(F(" "));
 105                                 Serial.println( UNITS[ evt->unit ]);
 106
 107                                 LcdPrint("Weight: ");
 108                                 dtostrf( weight, 4, 2, buf );
 109                                 LcdPrint( buf );
 110                                 LcdPrint( UNITS[ evt->unit ]);
 111
 112                         break;
 113
 114                 }//case WEIGHT_VALID...
 115
 116                 case WEIGHT_NEGATIVE: {
 117
 118                         const char negweight[] = "Negative weight";
 119                         Serial.println(negweight);
 120                         LcdPrint(negweight);
 121                         break;
 122                 }
 123
 124                 case OVERWEIGHT: {
 125
 126                         const char overweight[] = "Max.weight reached";
 127                         Serial.println(overweight);
 128                         LcdPrint( overweight );
 129                         break;
 130                 }
 131
 132                 case CALIBRATE_ME:
 133
 134                         Serial.println(F("Scale calibration required"));
 135                         break;
 136
 137                 case ZERO_ME:
 138
 139                         Serial.println(F("Scale zeroing required"));
 140                         break;
 141
 142                 default:
 143
 144                         Serial.print(F("Undefined status code: "));
 145                         Serial.println( evt->status );
 146                         break;
 147
 148         }//switch( evt->status...
 149
 150 }