begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 10) begin
one_wire_buf <= 0;
step <= step + 1'b1; state <= WRITE01; end
else if (step == 11) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 12) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 13) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 14) begin
one_wire_buf <= 0;
step <= step + 1'b1;
state <= WRITE01; end
else if (step == 15) begin
step <= step + 1'b1; state <= WRITE0; end
// 第一次写完,750ms后,跳回S0 else if (step == 16) begin
one_wire_buf <= 1'bZ; step <= step + 1'b1;
state <= S6; end
// 再次置数0xCC和0xBE
else if (step == 17) // 0xCC begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 18) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 19)
//s6为延时步骤 //再始化后通过step变量寻至此步
begin
one_wire_buf <= 0;
step <= step + 1'b1;
state <= WRITE01; end
else if (step == 20) begin
step <= step + 1'b1; state <= WRITE01; one_wire_buf <= 0; end
else if (step == 21) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 22) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 23) begin
one_wire_buf <= 0;
step <= step + 1'b1; state <= WRITE01; end
else if (step == 24) begin
one_wire_buf <= 0;
step <= step + 1'b1;
state <= WRITE01; end
else if (step == 25) // 0xBE DS模块输出数据 begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 26) begin
one_wire_buf <= 0;
step <= step + 1'b1;
state <= WRITE01; end
else if (step == 27) begin
one_wire_buf <= 0;
step <= step + 1'b1;
state <= WRITE01; end
else if (step == 28) begin
one_wire_buf <= 0;
step <= step + 1'b1;
state <= WRITE01; end
else if (step == 29)
begin
one_wire_buf <= 0;
step <= step + 1'b1; state <= WRITE01; end
else if (step == 30) begin
one_wire_buf <= 0;
step <= step + 1'b1; state <= WRITE01; end
else if (step == 31) begin
step <= step + 1'b1; state <= WRITE0; end
else if (step == 32) begin
one_wire_buf <= 0;
step <= step + 1'b1; state <= WRITE01; end
// 第二次写完,跳到S7,直接开始读数据 else if (step == 33) begin
step <= step + 1'b1; state <= S7; end
通过步骤数step控制程序进程