lin总线 verilog代码
时间: 2023-07-02 08:05:15 浏览: 106
以下是一个基本的Lin总线传输的Verilog代码示例:
```
module lin_bus (
input clk,
input rst,
input lin_en,
input [7:0] tx_data,
input tx_en,
output [7:0] rx_data,
output rx_en
);
// 声明状态机状态
parameter IDLE = 2'b00;
parameter SYNC = 2'b01;
parameter HEADER = 2'b10;
parameter DATA = 2'b11;
// 声明状态机信号
reg [1:0] state;
reg [7:0] header;
reg [7:0] data;
reg [3:0] checksum;
reg rx_complete;
// 初始化状态机
initial begin
state = IDLE;
end
// 状态机
always @(posedge clk or posedge rst) begin
if (rst) begin
state <= IDLE;
rx_complete <= 0;
header <= 0;
data <= 0;
checksum <= 0;
end else begin
case (state)
IDLE: begin
if (lin_en) begin
state <= SYNC;
end
end
SYNC: begin
if (!lin_en) begin
state <= IDLE;
end else if (tx_en) begin
header <= 0x55;
state <= HEADER;
end
end
HEADER: begin
if (!lin_en) begin
state <= IDLE;
end else if (tx_en) begin
header <= tx_data;
state <= DATA;
end
end
DATA: begin
if (!lin_en) begin
state <= IDLE;
end else if (tx_en) begin
data <= tx_data;
checksum <= checksum + tx_data;
if (checksum > 0xF) begin
checksum <= checksum + 1;
end
state <= DATA;
end else begin
if (checksum == 0xF) begin
rx_complete <= 1;
state <= IDLE;
end else begin
state <= SYNC;
end
end
end
endcase
end
end
// 接收器
always @(posedge clk) begin
if (state == SYNC && !lin_en && rx_complete) begin
rx_en <= 1;
end else begin
rx_en <= 0;
end
case (state)
HEADER: begin
rx_data <= header;
end
DATA: begin
rx_data <= data;
end
default: begin
rx_data <= 0;
end
endcase
end
endmodule
```
请注意,此代码仅用于示例目的。实际应用中,可能需要更复杂的状态机和错误检测机制。此外,还需要进行物理层和传输层的接口设计,以确保Lin总线的正确通信。
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