7segLed_HC595.cpp

00001 
00002 
00003 #include "7segLed_HC595.h"
00004 
00005 SevenSegLed::SevenSegLed
00006 ( PinName sdo, PinName sclk, PinName latch, PinName bright,
00007   uint8_t num_of_digit
00008 )
00009     : spi_(sdo, NC, sclk), latch_(latch), pwm_(bright)
00010 {
00011     num = num_of_digit;
00012     dot_inf = 0;
00013     zerosuppress = false;
00014     spi_.frequency(1000000);
00015     spi_.format(8,0);
00016     latch_ = 0;
00017     pwm_.period_ms(2);
00018     bright_data = 1.0f;
00019     pwm_.pulsewidth_us(bright_data);
00020 }
00021 
00022 void SevenSegLed::put_num(int32_t dt)
00023 {
00024     wrk = dt;
00025     for(uint32_t i = 0; i < num; i++) {
00026         buf[i] = wrk % 10;  // set each digit value
00027         wrk /= 10;          // next digit
00028     }
00029     num_mode = true;        // set number display mode
00030     seven_seg_n_digt();     // convert to seven segment element and send SPI
00031 }
00032 
00033 void SevenSegLed::put_ascii(const char *data)
00034 {
00035     char dt;
00036 
00037     dot_inf = 0;            // clear all dot
00038     for (uint32_t i = 0; i < BUFFER_SIZE; i++) {
00039         buf[i] = 0;
00040     }
00041     int32_t po = num - 1;
00042     for(uint32_t pi = 0; ; pi++) {
00043         dt = *(data + pi);
00044         //pc.putc(dt);
00045         if (dt == 0) {
00046             break;          // end of strings
00047         }
00048         if (dt == '.') {    // check dot
00049             if (pi == 0) {
00050                 buf[po] = 0;
00051                 po--;
00052                 dot_inf |= 1U << num - 1; // set dot
00053             } else {
00054                 dot_inf |= 1U << (po + 1); // set dot
00055             }
00056             pi++;
00057             dt = *(data + pi);
00058         }
00059         buf[po] = dt - '0';// convert ASCII number to value
00060         po--;
00061         if (po == -1) {
00062             break;
00063         }
00064     }
00065     num_mode = false;       // set none number display mode
00066     seven_seg_n_digt();     // convert to seven segment element and send SPI
00067 }
00068 
00069 void SevenSegLed::put_raw(uint8_t *data)
00070 {
00071     for(uint32_t i = 0; i < num; i++) {
00072         uint8_t dt = *(data + i);
00073         if (dt == 0) {
00074             break;
00075         }
00076         seg[i] = dt;
00077     }
00078     spi_out();
00079 }
00080 
00081 void SevenSegLed::put_dot(uint16_t position)
00082 {
00083     dot_inf = position;
00084 }
00085 
00086 void SevenSegLed::clear_all_dot()
00087 {
00088     dot_inf = 0;
00089 }
00090 
00091 void SevenSegLed::zero_suppress(bool mode)
00092 {
00093     zerosuppress = mode;
00094 }
00095 
00096 void SevenSegLed::brightness(float bright)
00097 {
00098     bright_data = bright;
00099     pwm_.pulsewidth_us((int)(2000 * (1.0f - bright)));
00100 }
00101 
00102 void SevenSegLed::frequency(int32_t freq)
00103 {
00104     spi_.frequency((int)freq);
00105 }
00106 
00107 void SevenSegLed::seven_seg_n_digt()
00108 {
00109     uint8_t const seg_bit[10] =
00110     {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7c, 0x27, 0x7f, 0x67};
00111     //  0     1     2     3     4     5     6     7     8     9
00112 
00113     for(uint32_t i = 0; i < num; i++) {
00114         seg[i] = seg_bit[buf[i]];   // convert number to segment data
00115     }
00116     if ((num_mode == true) && (zerosuppress == true)) { // zero suppress
00117         for(uint32_t i = 0; i < num; i++) {
00118             if (seg[num -1 - i] == 0x3f) {  // if zero then zero suppress
00119                 if ((num -1 - i) == 0) {
00120                     break;
00121                 }
00122                 seg[num -1 - i] = 0;
00123             } else {
00124                 break;
00125             }
00126         }
00127     }
00128     set_dot();
00129     spi_out();
00130 }
00131 
00132 void SevenSegLed::set_dot()
00133 {
00134     for(uint8_t i = 0; i < num; i++) {
00135         if ((dot_inf >> i) & 0x0001) {      // check dot request
00136             seg[i] |= 0x80;                 // add dot
00137         }
00138     }
00139     for(uint8_t i = 0; i < num; i++) {
00140         if (seg[num -1 - i] & 0x80) {       // check dot is on or off
00141             if (seg[num -1 - i] == 0x80) {  // did zero suppress condition
00142                 seg[num -1 - i] = 0xbf;     // set zero+dot
00143                 for(i++; i < num; i++) {
00144                     if (seg[num -1 - i] == 0) { // check zero suppress
00145                         seg[num -1 - i] = 0x3f; // set zero
00146                     }
00147                 }
00148                 break;
00149             }
00150         }
00151     }
00152 }
00153 
00154 void SevenSegLed::spi_out()
00155 {
00156     pwm_.pulsewidth_us(0);
00157     for(uint32_t i = 0; i < num; i++) {
00158         spi_.write(seg[i]);     // send SPI line
00159     }
00160     latch_ = 1;                 // set latch pulse
00161     wait_us(2);
00162     latch_ = 0;
00163     pwm_.pulsewidth_us((int)(2000 * (1.0f - bright_data)));
00164 }
00165 
00166 //------------------------------------------------------------------------------
00167 // Alphabet on 7segment
00168 // refernce
00169 //  WentWayUp: WebLog
00170 //    http://wentwayup.tamaliver.jp/e400000.html
00171 //------------------------------------------------------------------------------
00172 
00173 #define OFFSET  0x20
00174 
00175 char const alphabet_7seg[] = {
00176     // space
00177     0x00,
00178     // !     "     #     $     %     &     '     (     )     *
00179     0x0a, 0x22, 0x7e, 0x2d, 0x24, 0x3c, 0x20, 0x61, 0x43, 0x63,
00180     // +     ,     -     .     /
00181     0x44, 0x0c, 0x40, 0x10, 0x52,
00182     // 0     1     2     3     4     5     6     7     8     9
00183     0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7c, 0x07, 0x7f, 0x67,
00184     // :     ;     <     =     >     ?
00185     0x09, 0x51, 0x59, 0x48, 0x4d, 0x4b,
00186     // @
00187     0x5f,
00188     // A     B     C     D     E     F     G     H     I  J (another C=0x39)
00189     0x77, 0x7c, 0x58, 0x5e, 0x79, 0x71, 0x3d, 0x74, 0x04, 0x1e,
00190     // K     L     M     N     O     P     Q     R     S     T
00191     0x75, 0x38, 0x55, 0x54, 0x5c, 0x73, 0x6b, 0x50, 0x6c, 0x78,
00192     // U     V     W     X     Y     Z (another W=0x7e)
00193     0x1c, 0x1d, 0x2a, 0x49, 0x6e, 0x1b,
00194     // [     \     ]     ^     _
00195     0x39, 0x64, 0x0f, 0x23, 0x08,
00196     // `
00197     0x02,
00198     // a     b     c     d     e     f     g     h     i     j
00199     0x77, 0x7c, 0x58, 0x5e, 0x79, 0x71, 0x3d, 0x74, 0x04, 0x1e,
00200     // k     l     m     n     o     p     q     r     s     t
00201     0x75, 0x38, 0x55, 0x54, 0x5c, 0x73, 0x6b, 0x50, 0x6c, 0x78,
00202     // u     v     w     x     y     z
00203     0x1c, 0x1d, 0x2a, 0x49, 0x6e, 0x1b,
00204     // {     |     }     ~
00205     0x46, 0x30, 0x70, 0x01
00206 };
00207 
00208 void SevenSegLed::put_strings(const char *data)
00209 {
00210     for(uint32_t i = 0; i < num; i++) {
00211         char c = *(data + i);
00212         if (c <= OFFSET) {          // control charcters
00213             seg[num -1 - i] = 0;
00214         } else if ( c > '~') {      // over '~' characters
00215             seg[num -1 - i] = 0;
00216         } else {                    // serach table
00217             seg[num -1 - i] = alphabet_7seg[c - OFFSET];
00218         }
00219     }
00220     spi_out();
00221 }