end S6 : begin
cnt_1us_clear <= 0;
if (cnt_1us == 750000 | one_wire) // 延时750ms!!!! begin
cnt_1us_clear <= 1;
state <= S0; // 跳回S0,再次初始化 end end
S7 : begin // 读数据 if (step == 34) begin
bit_valid <= 0; one_wire_buf <= 0;
step <= step + 1'b1; state <= READ0; end
else if (step == 35) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1; state <= READ0; end
else if (step == 36) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1; state <= READ0; end
else if (step == 37) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 38) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 39) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 40) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 41) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1; state <= READ0; end
else if (step == 42) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 43) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1; state <= READ0; end
else if (step == 44) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0;
end
else if (step == 45) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 46) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 47) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 48) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; end
else if (step == 49) begin
bit_valid <= bit_valid + 1'b1; one_wire_buf <= 0;
step <= step + 1'b1;
state <= READ0; //READ0通过一串指向后返回s7，结合step回到当前步骤数 end
else if (step == 50) begin
step <= 0; state <= S0; end
end
//++++++++++++++++++++++++++++++++ // 写状态机
//++++++++++++++++++++++++++++++++ WRITE0 : begin
cnt_1us_clear <= 0;
one_wire_buf <= 0; // 输出0 if (cnt_1us == 80) // 延时80us begin
cnt_1us_clear <= 1;
one_wire_buf <= 1'bZ; // 释放总线，自动拉高 state <= WRITE00; end