各位大虾帮我看看这个程序错在哪？万分感激！
module jz_keys(input clk,
input rst,
input row, // 矩阵键盘 行
output reg col, // 矩阵键盘 列
output reg keyboard_val // 键盘值
);
//++++++++++++++++++++++++++++++++++++++
// 状态机部分 开始
//++++++++++++++++++++++++++++++++++++++
// 状态编码
parameter NO_KEY_PRESSED = 6'b000_001;// 没有按键按下
parameter SCAN_COL0 = 6'b000_010;// 扫描第0列
parameter SCAN_COL1 = 6'b000_100;// 扫描第1列
parameter SCAN_COL2 = 6'b001_000;// 扫描第2列
parameter SCAN_COL3 = 6'b010_000;// 扫描第3列
parameter KEY_PRESSED = 6'b100_000;// 有按键按下
reg current_state, next_state; // 现态、次态
regkey_pressed_flag; // 键盘按下标志
reg col_reg, row_reg; // 列值、行值
reg delay_en; //延时5ms后使能端为1,否则为0
reg c0;
reg clk0;
always @(posedge clk0 or negedge rst)
if(!rst)
next_state<=NO_KEY_PRESSED;
else
current_state<=next_state;
always @*
case(current_state)
NO_KEY_PRESSED:begin
if(row!=4'b1111)next_state=SCAN_COL0;
elsenext_state=NO_KEY_PRESSED;end
SCAN_COL0:begin
if(row!=4'b1111)
next_state=KEY_PRESSED;
elsenext_state=SCAN_COL1;end
SCAN_COL1: begin
if(row!=4'b1111)
next_state=KEY_PRESSED;
elsenext_state=SCAN_COL2;end
SCAN_COL2: begin
if(row!=4'b1111)
next_state=KEY_PRESSED;
elsenext_state=SCAN_COL3;end
SCAN_COL3: begin
if(row!=4'b1111)
next_state=KEY_PRESSED;
elsenext_state=NO_KEY_PRESSED; end
KEY_PRESSED:begin
if(row!=4'b1111)
next_state=KEY_PRESSED;
elsenext_state=NO_KEY_PRESSED;end
endcase
always @ (posedge clk0 or negedge rst)
if (!rst)
begin
col<= 4'h0; key_pressed_flag<=0;
end
else
case(next_state)
NO_KEY_PRESSED:begin col<=4'b0000;key_pressed_flag<=0;end
SCAN_COL0:col<=4'b1110;
SCAN_COL1:col<=4'b1101;
SCAN_COL2:col<=4'b1011;
SCAN_COL3:col<=4'b0111;
KEY_PRESSED: begin
col_reg<=col;row_reg<=row;
key_pressed_flag<=1;
end
endcase
always@(posedge clk0 or negedge rst) begin
if(!rst) keyboard_val<=7'b0000000;
else if(key_pressed_flag)
case({col,row})
8'b1110_1110: keyboard_val<=7'b1111110; //显示"0"
8'b1110_1101: keyboard_val<=7'b0110011; //显示"4"
8'b1110_1011: keyboard_val<=7'b1111111; //显示"8"
8'b1110_0111: keyboard_val<=7'b1001111; //显示"C"
8'b1101_1110: keyboard_val<=7'b0110000; //显示"1"
8'b1101_1101: keyboard_val<=7'b1011011; //显示"5"
8'b1101_1011: keyboard_val<=7'b1110011; //显示"9"
8'b1101_0110: keyboard_val<=7'b0111101; //显示"d"
8'b1011_1110: keyboard_val<=7'b1101101; //显示"2"
8'b1011_1101: keyboard_val<=7'b1011111; //显示"6"
8'b1011_1011: keyboard_val<=7'b1110111; //显示"A"
8'b1011_0111: keyboard_val<=7'b1001111; //显示"E"
8'b0111_1110: keyboard_val<=7'b1111001; //显示"3"
8'b0111_1101: keyboard_val<=7'b1110000; //显示"7"
8'b0111_1011: keyboard_val<=7'b0011111; //显示"b"
8'b0111_0111: keyboard_val<=7'b1000111; //显示"F"
endcase end
always @(posedge clk or negedge rst)begin //分频为5KHz
if (!rst) c0<=0;
else if(c0<2000) c0<=c0+1;
else begin clk0=~clk0; c0<=0;end
end
endmodule 你在两个always里面都next-state<=***,这是不可以的，赋值不能同时赋给一个变量 always @(posedge clk0 or negedge rst)
if(!rst)
current_state<=NO_KEY_PRESSED;
else
current_state<=next_state;
这样至少编译没有问题 感谢这位大虾，就是这个问题！:D 路过~…………
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