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<P><table class="ttop"><th class="tpre"><a href="31_Listing_of_Makefile.html">Previous Lesson</a></th><th class="ttop"><a href="toc.html">Table of Content</a></th><th class="tnxt"><a href="33_Listing_of_make_mem.cc.html">Next Lesson</a></th></table>
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<hr>
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<H1><A NAME="section_1">32 LISTING OF hello.c</A></H1>
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<pre class="vhdl">
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1 #include "stdint.h"
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2 #include "avr/io.h"
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3 #include "avr/pgmspace.h"
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4
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5 #undef F_CPU
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6 #define F_CPU 25000000UL
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7 #include "util/delay.h"
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8
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9
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10 //----------------------------------------------------------------------//
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11 // //
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12 // print char cc on UART. //
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13 // return number of chars printed (i.e. 1). //
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14 // //
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15 //----------------------------------------------------------------------//
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16 uint8_t
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17 uart_putc(uint8_t cc)
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18 {
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19 while ((UCSRA & (1 << UDRE)) == 0) ;
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20 UDR = cc;
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21 return 1;
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22 }
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23
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24 //----------------------------------------------------------------------//
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25 // //
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26 // print char cc on 7 segment display. //
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27 // return number of chars printed (i.e. 1). //
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28 // //
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29 //----------------------------------------------------------------------//
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30 // The segments of the display are encoded like this:
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31 //
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32 //
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33 // segment PORT B
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34 // name Bit number
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35 // ----A---- ----0----
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36 // | | | |
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37 // F B 5 1
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38 // | | | |
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39 // ----G---- ----6----
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40 // | | | |
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41 // E C 4 2
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42 // | | | |
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43 // ----D---- ----3----
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44 //
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45 //-----------------------------------------------------------------------------
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46
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47 #define SEG7(G, F, E, D, C, B, A) (~(G<<6|F<<5|E<<4|D<<3|C<<2|B<<1|A))
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48
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49 uint8_t
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50 seg7_putc(uint8_t cc)
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51 {
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52 uint16_t t;
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53
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54 switch(cc)
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55 { // G F E D C B A
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56 case ' ': PORTB = SEG7(0,0,0,0,0,0,0); break;
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57 case 'E': PORTB = SEG7(1,1,1,1,0,0,1); break;
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58 case 'H': PORTB = SEG7(1,1,1,0,1,1,0); break;
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59 case 'L': PORTB = SEG7(0,1,1,1,0,0,0); break;
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60 case 'O': PORTB = SEG7(0,1,1,1,1,1,1); break;
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61 default: PORTB = SEG7(1,0,0,1,0,0,1); break;
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62 }
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63
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64 // wait 800 + 200 ms. This can be quite boring in simulations,
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65 // so we wait only if DIP switch 6 is closed.
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66 //
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67 if (!(PINB & 0x20)) for (t = 0; t < 800; ++t) _delay_ms(1);
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68 PORTB = SEG7(0,0,0,0,0,0,0);
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69 if (!(PINB & 0x20)) for (t = 0; t < 200; ++t) _delay_ms(1);
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70
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71 return 1;
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72 }
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73
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74 //----------------------------------------------------------------------//
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75 // //
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76 // print string s on UART. //
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77 // return number of chars printed. //
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78 // //
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79 //----------------------------------------------------------------------//
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80 uint16_t
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81 uart_puts(const char * s)
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82 {
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83 const char * from = s;
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84 uint8_t cc;
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85 while ((cc = pgm_read_byte(s++))) uart_putc(cc);
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86 return s - from - 1;
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87 }
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88
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89 //----------------------------------------------------------------------//
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90 // //
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91 // print string s on 7 segment display. //
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92 // return number of chars printed. //
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93 // //
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94 //----------------------------------------------------------------------//
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95 uint16_t
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96 seg7_puts(const char * s)
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97 {
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98 const char * from = s;
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99 uint8_t cc;
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100 while ((cc = pgm_read_byte(s++))) seg7_putc(cc);
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101 return s - from - 1;
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102 }
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103
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104 //-----------------------------------------------------------------------------
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105 int
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106 main(int argc, char * argv[])
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107 {
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108 for (;;)
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109 {
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110 if (PINB & 0x40) // DIP switch 7 open.
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111 {
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112 // print 'Hello world' on UART.
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113 uart_puts(PSTR("Hello, World!\r\n"));
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114 }
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115 else // DIP switch 7 closed.
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116 {
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117 // print 'HELLO' on 7-segment display
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118 seg7_puts(PSTR("HELLO "));
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119 }
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120 }
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121 }
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122 //-----------------------------------------------------------------------------
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<pre class="filename">
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app/hello.c
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</pre></pre>
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<P>
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<P><hr><BR>
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<table class="ttop"><th class="tpre"><a href="31_Listing_of_Makefile.html">Previous Lesson</a></th><th class="ttop"><a href="toc.html">Table of Content</a></th><th class="tnxt"><a href="33_Listing_of_make_mem.cc.html">Next Lesson</a></th></table>
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