LED digital display (LEDSegmentDisplays) is a device that is packaged together by a plurality of light-emitting diodes to form an "8" shape. The leads are connected internally, and only need to draw their respective strokes and common electrodes. The number of commonly used segments of the LED digital tube is generally 7 points plus one decimal point, and the other is similar to the 3-digit "+1" type. There are half digits, 1, 2, 3, 4, 5, 6, 8, 10 and so on. According to the LED connection method, the LED digital tube is divided into two types: common yin and common yang. It is very important to understand these characteristics of LED, because different types of digital tubes, besides their hardware circuits, programming methods It is also different. Figure 2 shows the internal circuits of the common cathode and common anode digital tubes. Their principle of illumination is the same, except that their power supply polarity is different. The colors are red, green, blue, yellow and so on. Figure 1 This is a 7-segment LED digital tube with a decimal point of 10 pins. Figure 2 pin definition Modulekey_led(clk_50M,key,duan_ma,wei_ma); inputclk_50M; Input[3:0]key;//key is the value of the input key code Output[3:0]wei_ma; Output[7:0]duan_ma; Wire[3:0]key; Reg[7:0]duan_ma; Reg[3:0]wei_ma; Reg[3:0]key_temp;//set a register Always@(posedgeclk_50M) Begin Key_temp "=key; / / assign the value of the key code to the register Case(key_temp) 4'b0111:duan_ma"=8'b1100_0000;// segment code, after pressing the button, the digital tube displays 0 4'b1011:duan_ma"=8'b1001_0000;// segment code, digital tube display 9 4'b1101:duan_ma"=8'b1000_0010;// segment code, digital tube display 6 4'b1110:duan_ma"=8'b1011_0000;// segment code, digital tube display 3 Endcase End Always@(posedgeclk_50M) Begin Case(key_temp) 4'b0111: wei_ma "= 4'b0111; / / bit selection signal 4'b1011:wei_ma"=4'b1011; 4'b1101:wei_ma"=4'b1101; 4'b1110:wei_ma"=4'b1110; Endcase End Endmodule Digital tube static display 0-7 Moduleled_0_7(clk,rst,dataout,en); Inputclk,rst; Output[7:0]dataout;//The segment code output of the digital tube Output[7:0]en;//The digital tube's bit selection enable output Reg[7:0]dataout;//data output of each segment Reg[7:0]en; Reg[15:0]cnt_scan;//scan frequency counter Reg[4:0]dataout_buf; Always@(posedgeclkornegedgerst) Begin If(!rst)begin Cnt_scan "=0; End Elsbegin Cnt_scan"=cnt_scan+1; End End
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Button and digital tube display
July 19, 2023