A4988驱动器接法示意图
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1 assign sel = 8'b11111111; 2 3 always @(*) begin 4 if(!rst_n) 5 seg_0 = 8'h3f; // 不显礿 6 else begin 7 case(lsm_cnt) 8 4'h0: seg_0 = 8'h3f; 9 4'h1: seg_0 = 8'h06; 10 4'h2: seg_0 = 8'h5b; 11 4'h3: seg_0 = 8'h4f; 12 4'h4: seg_0 = 8'h66; 13 4'h5: seg_0 = 8'h6d; 14 4'h6: seg_0 = 8'h7d; 15 4'h7: seg_0 = 8'h07; 16 4'h8: seg_0 = 8'h7f; 17 4'h9: seg_0 = 8'h6f; 18 default: seg_0 = 8'hff; // 不显礿 19 endcase 20 end 21 end 22 23 always @(*) begin 24 if(!rst_n) 25 seg_1 = 8'h7f; // 不显礿 26 else begin 27 case(lsm_cnt) 28 4'h0: seg_1 = 8'h3f; 29 4'h1: seg_1 = 8'h06; 30 4'h2: seg_1 = 8'h5b; 31 4'h3: seg_1 = 8'h4f; 32 4'h4: seg_1 = 8'h66; 33 4'h5: seg_1 = 8'h6d; 34 4'h6: seg_1 = 8'h7d; 35 4'h7: seg_1 = 8'h07; 36 4'h8: seg_1 = 8'h7f; 37 4'h9: seg_1 = 8'h6f; 38 default: seg_1 = 8'hff; // 不显礿 39 endcase 40 end 41 end
