用verilog语言写一个具有优先级的病房呼叫系统,要求5个病房,1-5优先级依次降低。数码管显示呼叫信号的号码,没信号呼叫时显示0,有多个信号呼叫时显示优先级最高的呼叫号。每次呼叫都发出5秒的呼叫声。对低优先级的呼叫进行存储,处理完高优先级的呼叫再对低优先级的进行处理。
时间: 2024-03-06 17:46:54 浏览: 34
以下是一个基于 Verilog 的具有优先级的病房呼叫系统的代码,满足题目要求:
```
module priority_call_sys(
input wire clk,
input wire rst_n,
input wire [4:0] call_button,
output reg [3:0] display,
output reg [4:0] speaker
);
parameter CALL_TIME = 50000000; // 5s
// 定义状态机状态
localparam IDLE = 2'b00;
localparam PROCESS_HIGH = 2'b01;
localparam PROCESS_LOW = 2'b10;
// 定义计时器和优先级队列
reg [24:0] timer;
reg [4:0] queue_high;
reg [4:0] queue_low;
// 定义状态机
reg [1:0] state;
always @(posedge clk) begin
if (!rst_n) begin
state <= IDLE;
timer <= 0;
queue_high <= 0;
queue_low <= 0;
display <= 0;
speaker <= 0;
end
else begin
case (state)
IDLE: begin
if (call_button != 0) begin
if (call_button == 5'b10000 || queue_high == 0) begin
queue_high <= call_button;
state <= PROCESS_HIGH;
end
else
queue_low <= queue_low | call_button;
end
end
PROCESS_HIGH: begin
display <= queue_high;
speaker <= queue_high;
timer <= CALL_TIME;
state <= PROCESS_LOW;
end
PROCESS_LOW: begin
if (timer == 0) begin
if (queue_high != 0) begin
queue_high <= 0;
state <= PROCESS_HIGH;
end
else if (queue_low != 0) begin
queue_high <= queue_low & ~(queue_low - 1);
queue_low <= queue_low & (queue_low - 1);
state <= PROCESS_HIGH;
end
else
state <= IDLE;
end
else
timer <= timer - 1;
end
endcase
end
end
endmodule
```
该代码中,使用了有限状态机对病房呼叫系统进行控制。当呼叫按钮被按下时,系统会判断当前呼叫的优先级,并将其存储到相应的队列中。如果当前呼叫的优先级高于已有呼叫,则会将其加入高优先级队列中,否则加入低优先级队列中。在处理呼叫时,系统会先处理高优先级队列中的呼叫,直到队列为空,再处理低优先级队列中的呼叫。
在处理呼叫时,系统会将呼叫号码显示在数码管上,并发出 5 秒钟的呼叫声。同时,系统会使用优先级最高的呼叫号码作为输出信号,用于控制病房呼叫系统的其他部分。