用verilog代码实现病房呼叫系统，使用Audio音频模块，设计一个具有优先级的病房呼叫系统。要求：1.用1-5个开关模拟5个病房呼叫输入信号，1号优先级最高；2-5优先级依次降低。2.用一个数码管显示呼叫信号的号码；没有信号呼叫时显示0；有多个信号呼叫时，显示优先级最高的呼叫号（其他呼叫号用指示灯表示）3.呼叫发出5秒的呼叫声4.对低优先级的呼叫进行存储，处理完高优先级的呼叫，再处理低优先级

以下是一个基于 Verilog 的病房呼叫系统的代码实现，符合您的要求：

module HospitalCallSystem (
    input clk,           // 时钟信号
    input [4:0] sw,      // 5个开关输入
    output reg [3:0] led,// 4个指示灯输出
    output reg [3:0] seg,// 数码管控制信号
    output reg [7:0] dac // 音频模块输出
);

// 定义常量
parameter MAX_PRIORITY = 5;      // 最大优先级
parameter MAX_CALL_TIME = 5;     // 呼叫持续时间
parameter CLK_FREQ = 50000000;   // 时钟频率
parameter DAC_FREQ = 1000;       // 音频模块输出频率

// 定义状态常量
parameter STATE_IDLE = 2'b00;    // 空闲状态
parameter STATE_PROCESSING = 2'b01;  // 处理呼叫状态
parameter STATE_STORING = 2'b10; // 存储呼叫状态

// 定义状态寄存器和计数器
reg [1:0] state_reg, state_next; // 状态寄存器和下一状态寄存器
reg [4:0] call_reg, call_next;  // 当前呼叫号和下一呼叫号
reg [4:0] call_priority;        // 5个呼叫信号的优先级
reg [4:0] call_time;            // 5个呼叫信号的持续时间计数器
reg [3:0] call_queue [MAX_PRIORITY:1]; // 存储呼叫队列
reg [3:0] call_queue_size;      // 呼叫队列大小计数器
reg [31:0] timer_reg, timer_next;// 定时器计数器
reg [15:0] dac_reg, dac_next;   // 音频模块计数器

// 定义模块内部信号线
wire [4:0] call_priority_next;  // 下一呼叫信号的优先级
wire [3:0] call_queue_head;     // 呼叫队列头
wire [3:0] call_queue_tail;     // 呼叫队列尾

// 优先级编码器，将输入的呼叫号转换为优先级
priority_encoder pe (
    .in(call_next),
    .out(call_priority_next)
);

// 数码管控制器，根据当前呼叫号控制数码管显示
seven_segment_controller ssc (
    .in(call_reg),
    .out(seg)
);

// 音频模块，根据计数器输出声音
audio_module am (
    .clk(clk),
    .freq(DAC_FREQ),
    .out(dac),
    .en(dac_reg[15])
);

// 状态机
always @(posedge clk) begin
    // 状态寄存器更新为下一状态寄存器
    state_reg <= state_next;
    // 当前呼叫号更新为下一呼叫号
    call_reg <= call_next;
    // 定时器计数器更新为下一定时器计数器
    timer_reg <= timer_next;
    // 音频模块计数器更新为下一音频模块计数器
    dac_reg <= dac_next;

    case (state_reg)
        // 空闲状态
        STATE_IDLE: begin
            // 如果有呼叫信号，跳转到处理呼叫状态
            if (call_queue_size > 0) begin
                state_next <= STATE_PROCESSING;
                call_next <= call_queue[call_queue_head];
                call_priority[call_queue[call_queue_head]] <= 0;
            end
            // 没有呼叫信号，呼叫号为 0
            else begin
                state_next <= STATE_IDLE;
                call_next <= 5'b0;
            end
            timer_next <= timer_reg;
            dac_next <= 16'b0;
        end
        // 处理呼叫状态
        STATE_PROCESSING: begin
            // 如果当前呼叫持续时间超过 5 秒，跳转到空闲状态
            if (call_time[call_reg] >= MAX_CALL_TIME) begin
                state_next <= STATE_IDLE;
                call_next <= 5'b0;
                call_priority[call_reg] <= 0;
            end
            // 如果有更高优先级的呼叫信号，跳转到存储呼叫状态
            else if (call_priority_next < call_priority[call_reg]) begin
                state_next <= STATE_STORING;
                call_priority[call_reg] <= call_priority_next;
                call_queue[call_queue_tail] <= call_reg;
                call_queue_tail <= (call_queue_tail == MAX_PRIORITY) ? 1 : (call_queue_tail + 1);
            end
            // 当前呼叫持续时间小于 5 秒，状态继续保持
            else begin
                state_next <= STATE_PROCESSING;
                call_next <= call_reg;
                call_priority[call_reg] <= call_priority[call_reg];
            end
            // 定时器计数器减一
            timer_next <= timer_reg - 1;
            // 音频模块计数器减一
            dac_next <= dac_reg - 1;
        end
        // 存储呼叫状态
        STATE_STORING: begin
            // 如果呼叫队列已满，状态继续保持
            if (call_queue_size == MAX_PRIORITY) begin
                state_next <= STATE_STORING;
                call_next <= call_reg;
                call_priority[call_reg] <= call_priority[call_reg];
            end
            // 呼叫队列未满，跳转到空闲状态
            else begin
                state_next <= STATE_IDLE;
                call_next <= 5'b0;
                call_priority[call_reg] <= 0;
                call_queue[call_queue_tail] <= call_reg;
                call_queue_tail <= (call_queue_tail == MAX_PRIORITY) ? 1 : (call_queue_tail + 1);
                call_queue_size <= call_queue_size + 1;
            end
            timer_next <= timer_reg;
            dac_next <= 16'b0;
        end
    endcase
end

// 计时器
always @(posedge clk) begin
    // 定时器计数器更新为下一定时器计数器
    timer_reg <= timer_next;

    // 如果定时器计数器达到一个时钟周期，计数器减一
    if (timer_reg == 0) begin
        timer_next <= CLK_FREQ / MAX_CALL_TIME - 1;
        call_time <= call_time + 1;
    end
    // 否则，计数器继续保持
    else begin
        timer_next <= timer_reg - 1;
    end
end

// 优先级队列
always @(posedge clk) begin
    // 计算呼叫队列头和尾
    call_queue_head <= (call_queue_size == 0) ? 0 : call_queue[1];
    call_queue_tail <= (call_queue_size == 0) ? 0 : ((call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1));

    // 如果有呼叫信号，将呼叫信号的优先级设置为当前优先级，并将呼叫持续时间清零
    if (sw != 5'b0) begin
        call_priority[sw] <= MAX_PRIORITY + 1 - sw;
        call_time[sw] <= 0;
        // 如果呼叫队列已满，忽略该呼叫信号
        if (call_queue_size == MAX_PRIORITY) begin
            led <= sw;
        end
        // 呼叫队列未满，将呼叫信号存入呼叫队列中
        else begin
            call_queue[call_queue_tail] <= sw;
            call_queue_tail <= (call_queue_tail == MAX_PRIORITY) ? 1 : (call_queue_tail + 1);
            call_queue_size <= call_queue_size + 1;
            led <= 4'b1111 ^ (1 << (sw - 1));
        end
    end
    // 没有呼叫信号，呼叫号为 0，指示灯全部关闭
    else begin
        call_priority <= 5'b0;
        call_time <= 5'b0;
        call_queue_size <= 0;
        led <= 4'b1111;
    end

    // 根据呼叫队列的大小，计算数码管的显示值
    case (call_queue_size)
        0: seg <= 4'h0;
        1: seg <= call_queue[call_queue_head];
        2: seg <= (call_priority[call_queue[call_queue_head]] > call_priority[call_queue[call_queue_tail]]) ? call_queue[call_queue_head] : call_queue[call_queue_tail];
        3: seg <= (call_priority[call_queue[call_queue_head]] > call_priority[call_queue[call_queue_tail]]) ? call_queue[call_queue_head] : ((call_priority[call_queue[call_queue_tail]] > call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1)]]) ? call_queue[call_queue_tail] : call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1)]);
        4: seg <= (call_priority[call_queue[call_queue_head]] > call_priority[call_queue[call_queue_tail]]) ? call_queue[call_queue_head] : ((call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1)]] > call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 2)]]) ? call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1)] : ((call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 2)]] > call_priority[call_queue[(call_queue_tail == 2) ? MAX_PRIORITY : (call_queue_tail - 2)]]) ? call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 2)] : call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 3)])));
        5: seg <= (call_priority[call_queue[call_queue_head]] > call_priority[call_queue[call_queue_tail]]) ? call_queue[call_queue_head] : ((call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1)]] > call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 2)]]) ? call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 1)] : ((call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 2)]] > call_priority[call_queue[(call_queue_tail == 2) ? MAX_PRIORITY : (call_queue_tail - 2)]]) ? call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 2)] : ((call_priority[call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 3)]] > call_priority[call_queue[(call_queue_tail == 3) ? MAX_PRIORITY : (call_queue_tail - 2)]]) ? call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 3)] : call_queue[(call_queue_tail == 1) ? MAX_PRIORITY : (call_queue_tail - 4)]))));
    endcase
end

endmodule

上述代码中包含了状态机、优先级编码器、计时器、音频模