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- module uart_rx(
- clk,
- rst_n,
- bps_start,
- clk_bps,
- rs232_rx,
- rx_data,
- rx_int,
- led
- );
- input clk; //時(shí)鐘
- input rst_n; //復(fù)位
- input rs232_rx; //接收數(shù)據(jù)信號(hào)
- input clk_bps; //高電平時(shí)為接收信號(hào)中間采樣點(diǎn)
- output bps_start; //接收信號(hào)時(shí),波特率時(shí)鐘信號(hào)置位
- output [7:0] rx_data;//接收數(shù)據(jù)寄存器
- output rx_int; //接收數(shù)據(jù)中斷信號(hào),接收過(guò)程中為高
- output [7:0] led;
- reg [7:0] led;
- reg rs232_rx0,rs232_rx1,rs232_rx2,rs232_rx3;//接收數(shù)據(jù)寄存器
- wire neg_rs232_rx;//表示數(shù)據(jù)線接收到下沿
-
- always @(posedge clk or negedge rst_n) begin
- if(!rst_n) begin
- rs232_rx0 <= 1'b0;
- rs232_rx1 <= 1'b0;
- rs232_rx2 <= 1'b0;
- rs232_rx3 <= 1'b0;
- end
-
- else begin
- rs232_rx0 <= rs232_rx;
- rs232_rx1 <= rs232_rx0;
- rs232_rx2 <= rs232_rx1;
- rs232_rx3 <= rs232_rx2;
- end
- end
- assign neg_rs232_rx = rs232_rx3 & rs232_rx2 & ~rs232_rx1 & ~rs232_rx0;//串口傳輸線的下沿標(biāo)志
- reg bps_start_r;
- reg [3:0] num;//移位次數(shù)
- reg rx_int; //接收中斷信號(hào)
-
- always @(posedge clk or negedge rst_n)
- if(!rst_n) begin
- bps_start_r <=1'bz;
- rx_int <= 1'b0;
- end
- else if(neg_rs232_rx) begin//
- bps_start_r <= 1'b1; //啟動(dòng)串口,準(zhǔn)備接收數(shù)據(jù)
- rx_int <= 1'b1; //接收數(shù)據(jù)中斷使能
- end
- else if(num==4'd12) begin //接收完有用的信號(hào),
- bps_start_r <=1'b0; //接收完畢,改變波特率置位,方便下次接收
- rx_int <= 1'b0; //接收信號(hào)關(guān)閉
- end
-
- assign bps_start = bps_start_r;
-
- reg [7:0] rx_data_r;//串口數(shù)據(jù)寄存器
- reg [7:0] rx_temp_data;//當(dāng)前數(shù)據(jù)寄存器
-
- always @(posedge clk or negedge rst_n)
- if(!rst_n) begin
- rx_temp_data <= 8'd0;
- num <= 4'd0;
- rx_data_r <= 8'd0;
- end
- else if(rx_int) begin //接收數(shù)據(jù)處理
- if(clk_bps) begin
- num <= num+1'b1;
- case(num)
- 4'd1: rx_temp_data[0] <= rs232_rx;
- 4'd2: rx_temp_data[1] <= rs232_rx;
- 4'd3: rx_temp_data[2] <= rs232_rx;
- 4'd4: rx_temp_data[3] <= rs232_rx;
- 4'd5: rx_temp_data[4] <= rs232_rx;
- 4'd6: rx_temp_data[5] <= rs232_rx;
- 4'd7: rx_temp_data[6] <= rs232_rx;
- ……………………
- …………限于本文篇幅 余下代碼請(qǐng)從51黑下載附件…………
uart.7z
(1.28 MB, 下載次數(shù): 42)
2020-6-15 21:43 上傳
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