I'm designing a number exchange module, and so far I've been able to
make it display on Seven Segment Display (S-S-D), like if I press 0 it
shows 0... etc. I'm using 2 sets of 4-bits S-S-D (Common Anode).
Now I want to do like:
default states : 0000_0000
Now if I press 1 : 0000_0001
If I press 2 : 0000_0012
etc.
Whichever key I press, the display will not erase the already displaying
number, it will shift it to the left...
And when all 8 S-S-D is full of displaying numbers like: 486C_8763, at
this moment, when I press a key enter a number, like 1 it should be like
: 86C8_7631; it should keep shifting to the left.
Here's my attempted code, and only been able to display it on S-S-D, and
display all S-S-D 0000_0000... still not able to do what's been describe
above...
1 | module keydata
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2 | (
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3 | input clk, //input clk 50MHz
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4 | output reg [3:0]keyout=4'b1110, //Default scan value 4bits
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5 | input [3:0]keyin, //Keypad receive value
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6 | output reg [7:0]SegOut, //Seven Segment Display output
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7 | output reg [15:0]scano //Seven Segment Display Scans
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8 | );
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9 |
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10 | integer z1=0,zz=0; //Registers for frequency dividing
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11 | reg dclk; //Divided frequency clock
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12 | reg [7:0]bcdz; //register for saving keypad's number value
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13 | reg [3:0]scan; //scan states
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14 |
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15 |
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16 |
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17 | always@(posedge clk)
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18 | begin
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19 |
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20 | //---------------------
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21 | if(z1==50000) //frequency divider
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22 | begin
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23 | z1<=0;
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24 | scan<={scan[2:0],scan[3]}; //scanning pattern shifting resgister
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25 | keyout<={keyout[2:0],keyout[3]};
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26 | //keypad column scanning 1110->1101->1011->0111->1110(loop)
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27 | end
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28 | else
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29 | z1<=z1+1;
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30 | //---------------------
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31 |
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32 |
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33 | //---------------------
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34 | if(zz==10000) //frequency divider for scanning
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35 | begin
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36 | zz<=0;
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37 | dclk<=~dclk;
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38 | end
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39 | else
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40 | zz<=zz+1;
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41 | //---------------------
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42 | end
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43 |
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44 | always@(posedge dclk) //Seven Segment Scanning
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45 | begin
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46 | case(scan)
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47 | 0: scano<=scano[3:0];
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48 | 1: scano<=scano[7:4];
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49 | 2: scano<=scano[11:8];
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50 | 3: scano<=scano[15:12];
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51 | endcase
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52 | end
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53 |
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54 | always@(posedge dclk) //4x4 Keypad detecting
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55 | begin
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56 |
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57 |
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58 | if (keyout==4'b1110) //Detecting which keyout is currently at scanning
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59 | begin
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60 | if(keyin==4'b0111) //Tell which key it is
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61 | begin
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62 | bcdz<=4'b1100;//C //the key's value,save by a register
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63 | end
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64 | else if(keyin==4'b1011)
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65 | begin
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66 | bcdz<=4'b1101; //D
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67 | end
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68 | else if(keyin==4'b1101)
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69 | begin
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70 | bcdz<=4'b1110; //E
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71 | end
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72 | else if(keyin==4'b1110)
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73 | begin
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74 | bcdz<=4'b1111;//F
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75 | end
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76 | end
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77 |
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78 | else if (keyout==4'b1101) //Using **else if** to differentiate priorities.
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79 | begin
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80 | if(keyin==4'b0111)
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81 | begin
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82 | bcdz<=4'b1000; //8
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83 | end
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84 | else if(keyin==4'b1011)
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85 | begin
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86 | bcdz<=4'b1001; //9
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87 | end
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88 | else if(keyin==4'b1101)
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89 | begin
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90 | bcdz<=4'b1010; //A
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91 | end
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92 | else if(keyin==4'b1110)
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93 | begin
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94 | bcdz<=4'b1011; //B
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95 | end
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96 | end
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97 |
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98 | else if (keyout==4'b1011) //4 scanning possibilities
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99 | begin
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100 | if(keyin==4'b0111)
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101 | begin
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102 | bcdz<=4'b0100; //4
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103 | end
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104 | else if(keyin==4'b1011)
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105 | begin
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106 | bcdz<=4'b0101; //5
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107 | end
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108 | else if(keyin==4'b1101)
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109 | begin
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110 | bcdz<=4'b0110; //6
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111 | end
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112 | else if(keyin==4'b1110)
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113 | begin
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114 | bcdz<=4'b0111; //7
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115 | end
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116 | end
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117 |
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118 | else if (keyout==4'b0111)
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119 | begin
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120 | if(keyin==4'b0111)
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121 | begin
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122 | bcdz<=4'b0000; //0
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123 | end
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124 | else if(keyin==4'b1011)
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125 | begin
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126 | bcdz<=4'b0001; //1
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127 | end
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128 | else if(keyin==4'b1101)
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129 | begin
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130 | bcdz<=4'b0010; //2
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131 | end
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132 | else if(keyin==4'b1110)
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133 | begin
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134 | bcdz<=4'b0011; //3
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135 | end
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136 | end
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137 | end
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138 |
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139 | always@(bcdz) //Seven Segment Decoder
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140 | begin
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141 | case(bcdz)
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142 | 0 : SegOut <= 8'hC0;
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143 | 1 : SegOut <= 8'hF9;
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144 | 2 : SegOut <= 8'hA4;
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145 | 3 : SegOut <= 8'hB0;
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146 | 4 : SegOut <= 8'h99;
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147 | 5 : SegOut <= 8'h92;
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148 | 6 : SegOut <= 8'h82;
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149 | 7 : SegOut <= 8'hF8;
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150 | 8 : SegOut <= 8'h80;
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151 | 9 : SegOut <= 8'h98;
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152 | 10 : SegOut <= 8'h88;
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153 | 11 : SegOut <= 8'h83;
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154 | 12 : SegOut <= 8'hC6;
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155 | 13 : SegOut <= 8'hA1;
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156 | 14 : SegOut <= 8'h86;
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157 | 15 : SegOut <= 8'h8E;
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158 | default : SegOut <= 8'hFF;
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159 | endcase
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160 | end
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161 | endmodule
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