LED7segDisplay.cpp

00001 /**
00002  * @author Charles Young
00003  *
00004  */
00005 
00006 #include "LED7segDisplay.hpp"
00007 
00008 LED7segDisplay::LED7segDisplay()
00009 {
00010    brightness = BRIGHTNESS_MAX;
00011    Display_init();
00012 }
00013 
00014 //---------------------------------------------------------------------------
00015 // Initialize the MAX7219
00016 
00017 void LED7segDisplay::Display_init(void)
00018 {
00019    uint8_t i;
00020    uint16_t data_to_send[6] = {SHUTDOWN, TURN_ON, DEC_MODE, brightness, SCAN_LIM, TEST};
00021 
00022    for(i = 0; i < sizeof(data_to_send)/sizeof(uint16_t); i++)
00023    {
00024       sendDataToDisplay(data_to_send[i]);
00025    }
00026     
00027    return;
00028 }
00029 
00030 void LED7segDisplay::Display_brightness_up()
00031 {
00032    if (brightness < BRIGHTNESS_MAX)
00033    {
00034       Display_brightness(++brightness);
00035    }
00036 }
00037 
00038 void LED7segDisplay::Display_brightness_down()
00039 {
00040    if (brightness > BRIGHTNESS_MIN)
00041    {
00042       Display_brightness(--brightness);
00043    }
00044 }
00045 
00046 void LED7segDisplay::Display_brightness(uint16_t brightness)
00047 {
00048    sendDataToDisplay(brightness);
00049 }
00050 
00051 //---------------------------------------------------------------------------
00052 // Refresh the 6 digits of the main display
00053 
00054 
00055 //---------------------------------------------------------------------------
00056 // Refresh the 2 digits of the gate display
00057 
00058 void LED7segDisplay::Display_2D_Blank()
00059 {
00060    uint16_t data_to_send;
00061 
00062    for(uint8_t digit = 7; digit < 9; digit++)
00063    {
00064       // each stream consists of digit address and data to show
00065       data_to_send = digit;
00066       data_to_send<<=8;
00067       data_to_send = data_to_send | 0x7F;
00068       sendDataToDisplay(data_to_send);
00069    }
00070 }
00071 
00072 void LED7segDisplay::Display_6D_write(int32_t value)
00073 {
00074  
00075    uint8_t digit;
00076    uint16_t data_to_send;
00077    char TextString[6];
00078     
00079    // int to string, then string to digits
00080    sprintf(TextString, "%6d", value);   // int to string
00081     
00082    for(uint8_t i=0; i<6; i++)
00083    {   
00084       if(TextString[i] == ' ')  // blank empty digits
00085          Disp_Digit[i] = 0x7F;
00086       else
00087          Disp_Digit[i] = TextString[i]-'0';      
00088    }
00089 
00090    for(digit = 1; digit <7; digit++)
00091    {
00092       // each stream consists of digit address and data to show
00093       data_to_send = 7 - digit;
00094       data_to_send<<=8;
00095       data_to_send = data_to_send | Disp_Digit[digit-1];
00096       sendDataToDisplay(data_to_send);
00097    }
00098     
00099    return;
00100 }
00101 
00102 void LED7segDisplay::Display_2D_write(int16_t value)
00103 {
00104    bool negative = false;
00105    if (value < 0)
00106       negative = true;
00107    value = abs(value);
00108    
00109    uint8_t digit;
00110    uint16_t data_to_send;
00111    char TextString[2];
00112 
00113    // int to string, then string to digits
00114    sprintf(TextString, "%2d", value);   // int to string
00115 
00116    if(TextString[0] == ' ')  // blank empty digits
00117       Disp_Digit[7] = 0x7F;
00118    else
00119       Disp_Digit[7] = TextString[0] - '0';
00120     
00121    Disp_Digit[6] = TextString[1] - '0';
00122    // turn on decimal point to indicate negative
00123    if (negative)
00124       Disp_Digit[6] |= 0x80;
00125 
00126    for(digit = 7; digit <9; digit++)
00127    {
00128       // each stream consists of digit address and data to show
00129       data_to_send = digit;
00130       data_to_send<<=8;
00131       data_to_send = data_to_send | Disp_Digit[digit-1];
00132       sendDataToDisplay(data_to_send);
00133    }
00134     
00135    return;
00136 }
00137 
00138 void LED7segDisplay::sendDataToDisplay(uint16_t data_to_send)
00139 {
00140    CS1 = 0;
00141    for(uint16_t mask = 0x8000; mask!= 0; mask>>= 1)
00142    {
00143       wait_us(DT);
00144       SCK = 0;
00145       if(mask & data_to_send)
00146          MOSI = 1;
00147       else
00148          MOSI = 0;
00149                 
00150       wait_us(DT);
00151       SCK = 1;
00152    }
00153         
00154    wait_us(DT);    
00155    SCK = 0;
00156    wait_us(DT);
00157    CS1 = 1;
00158 }