用verilog语言写一段用来读取SPI的代码
时间: 2023-04-08 08:02:47 浏览: 105
我可以回答这个问题。以下是一段用 Verilog 语言编写的读取 SPI 的代码:
module spi_reader (
input clk,
input rst,
input cs,
output reg [7:0] data_out
);
reg [7:0] shift_reg;
reg [2:0] bit_count;
always @(posedge clk) begin
if (rst) begin
shift_reg <= 8'h00;
bit_count <= 3'h0;
end else if (cs == 1'b0) begin
shift_reg <= {shift_reg[6:0], data_out};
bit_count <= bit_count + 1;
if (bit_count == 3'h7) begin
shift_reg <= {1'b0, shift_reg[7:1]};
bit_count <= 3'h0;
end
end
end
endmodule
请注意,这只是一个简单的示例代码,实际应用中可能需要根据具体情况进行修改。
相关问题
用verilog语言写一段用来处理SPI的代码
我可以回答这个问题。以下是一段用 Verilog 语言编写的处理 SPI 的代码:
module spi_master (
input clk,
input reset,
input [7:0] data_in,
output reg [7:0] data_out,
output reg spi_clk,
output reg spi_cs_n,
output reg spi_mosi,
input spi_miso
);
reg [7:0] shift_reg;
reg [2:0] shift_cnt;
reg [7:0] tx_reg;
reg [7:0] rx_reg;
parameter IDLE = 3'b000;
parameter WRITE = 3'b001;
parameter READ = 3'b010;
parameter DONE = 3'b011;
reg [2:0] state;
reg [2:0] next_state;
always @(posedge clk or posedge reset) begin
if (reset) begin
state <= IDLE;
shift_reg <= 8'h00;
shift_cnt <= 3'b000;
tx_reg <= 8'h00;
rx_reg <= 8'h00;
spi_clk <= 1'b1;
spi_cs_n <= 1'b1;
spi_mosi <= 1'b0;
end else begin
state <= next_state;
shift_reg <= {spi_miso, shift_reg[7:1]};
shift_cnt <= (shift_cnt == 3'b111) ? 3'b000 : (shift_cnt + 1'b1);
data_out <= rx_reg;
end
end
always @(*) begin
case (state)
IDLE: begin
spi_clk <= 1'b1;
spi_cs_n <= 1'b1;
spi_mosi <= 1'b0;
if (data_in != 8'h00) begin
tx_reg <= data_in;
next_state <= WRITE;
end else begin
next_state <= IDLE;
end
end
WRITE: begin
spi_clk <= 1'b0;
spi_cs_n <= 1'b0;
spi_mosi <= tx_reg[7];
tx_reg <= {tx_reg[6:0], 1'b0};
if (shift_cnt == 3'b111) begin
rx_reg <= shift_reg;
next_state <= READ;
end else begin
next_state <= WRITE;
end
end
READ: begin
spi_clk <= 1'b0;
spi_cs_n <= 1'b1;
spi_mosi <= 1'b0;
if (shift_cnt == 3'b111) begin
next_state <= DONE;
end else begin
next_state <= READ;
end
end
DONE: begin
spi_clk <= 1'b1;
spi_cs_n <= 1'b1;
spi_mosi <= 1'b0;
next_state <= IDLE;
end
endcase
end
endmodule
希望这个代码对你有所帮助。
用verilog语言写一段用来接收SPI数据的代码
我可以回答这个问题。以下是一段用verilog语言写的接收SPI数据的代码:
module spi_receiver(
input clk,
input rst,
input spi_cs,
input spi_sclk,
input spi_mosi,
output reg [7:0] spi_data
);
reg [7:0] shift_reg;
reg [2:0] bit_cnt;
always @(posedge spi_sclk) begin
if (rst) begin
shift_reg <= 8'h00;
bit_cnt <= 3'b0;
end else begin
if (spi_cs == 1'b0) begin
shift_reg <= {spi_mosi, shift_reg[7:1]};
bit_cnt <= bit_cnt + 1;
if (bit_cnt == 3'b111) begin
spi_data <= shift_reg;
bit_cnt <= 3'b0;
end
end
end
end
endmodule
这段代码实现了一个简单的SPI接收器,可以接收8位数据。当SPI片选信号spi_cs为低电平时,接收器开始接收数据。每当SPI时钟spi_sclk上升沿到来时,接收器将数据位spi_mosi存入移位寄存器shift_reg中,并将计数器bit_cnt加1。当计数器bit_cnt达到7时,即接收完8位数据时,接收器将数据存入输出寄存器spi_data中,并将计数器bit_cnt清零。如果接收器被复位,移位寄存器和计数器都将被清零。