请你帮我用verilog写个串口通信代码
时间: 2024-02-28 13:57:40 浏览: 21
好的,下面是一个简单的串口通信代码的Verilog实现,其中包括了发送和接收两个模块。
```
module uart_tx(input clk, input rst_n, input [7:0] data_in, input start_tx, output reg tx_busy, output reg tx_done, output reg [3:0] baud_cnt, output reg tx_out);
parameter BAUD_RATE = 115200;
parameter CLOCK_FREQ = 50000000;
reg [15:0] baud_div;
reg [3:0] tx_state;
always @(posedge clk or negedge rst_n) begin
if (~rst_n) begin
baud_div <= 0;
tx_state <= 0;
tx_out <= 1;
tx_busy <= 0;
tx_done <= 0;
end else begin
if (baud_div == 0) begin
if (tx_state == 0) begin
if (start_tx) begin
baud_div <= CLOCK_FREQ / BAUD_RATE / 2;
tx_state <= 1;
tx_out <= 0;
tx_busy <= 1;
end
end else if (tx_state == 1) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 2;
end else if (tx_state == 2) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 3;
end else if (tx_state == 3) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 4;
end else if (tx_state == 4) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 5;
end else if (tx_state == 5) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 6;
end else if (tx_state == 6) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 7;
end else if (tx_state == 7) begin
tx_out <= data_in[0];
data_in <= {data_in[6:0], 1'b0};
tx_state <= 8;
end else if (tx_state == 8) begin
tx_out <= 1;
tx_busy <= 0;
tx_done <= 1;
tx_state <= 0;
end
end else begin
baud_div <= baud_div - 1;
end
end
end
endmodule
module uart_rx(input clk, input rst_n, input rx_in, output reg [7:0] data_out, output reg rx_done, output reg rx_error, output reg [3:0] baud_cnt);
parameter BAUD_RATE = 115200;
parameter CLOCK_FREQ = 50000000;
reg [15:0] baud_div;
reg [3:0] rx_state;
always @(posedge clk or negedge rst_n) begin
if (~rst_n) begin
baud_div <= 0;
rx_state <= 0;
data_out <= 8'h00;
rx_done <= 0;
rx_error <= 0;
end else begin
if (baud_div == 0) begin
if (rx_state == 0) begin
if (~rx_in) begin
baud_div <= CLOCK_FREQ / BAUD_RATE / 2;
rx_state <= 1;
baud_cnt <= 7;
data_out <= 8'h00;
end
end else if (rx_state == 1) begin
baud_div <= CLOCK_FREQ / BAUD_RATE / 2;
if (rx_in) begin
rx_state <= 2;
baud_cnt <= 0;
end else begin
baud_cnt <= baud_cnt - 1;
if (baud_cnt == 0) begin
rx_error <= 1;
rx_state <= 0;
end
end
end else if (rx_state == 2) begin
baud_div <= CLOCK_FREQ / BAUD_RATE / 2;
data_out <= {data_out[6:0], rx_in};
baud_cnt <= 7;
rx_state <= 3;
end else if (rx_state == 3) begin
baud_div <= CLOCK_FREQ / BAUD_RATE / 2;
if (rx_in) begin
baud_cnt <= 0;
rx_done <= 1;
rx_state <= 0;
end else begin
baud_cnt <= baud_cnt - 1;
if (baud_cnt == 0) begin
rx_error <= 1;
rx_state <= 0;
end
end
end
end else begin
baud_div <= baud_div - 1;
end
end
end
endmodule
```
这是一个很基础的实现,可以根据需要进行修改和优化。同时,需要注意的是,该实现仅支持固定波特率,需要根据具体需求进行修改。
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