FPGA SPI接收代码
时间: 2023-11-12 18:51:35 浏览: 33
以下是一个简单的FPGA上的SPI接收代码示例,使用Verilog语言实现:
```verilog
module SPI_Receiver (
input wire clk,
input wire reset,
input wire spi_clk,
input wire spi_cs,
input wire spi_miso,
output wire [7:0] data_out
);
reg [7:0] shift_reg;
reg [2:0] bit_counter;
reg [2:0] state;
always @(posedge clk or posedge reset) begin
if (reset) begin
shift_reg <= 8'b0;
bit_counter <= 3'b0;
state <= 3'b0;
end else begin
case (state)
3'b000: begin // Idle state, wait for CS to be low
if (~spi_cs) begin
state <= 3'b001;
end
end
3'b001: begin // Start receiving data
shift_reg <= {shift_reg[6:0], spi_miso};
bit_counter <= bit_counter + 1;
if (bit_counter == 3'b111) begin
state <= 3'b010;
end
end
3'b010: begin // Wait for CS to be high
if (spi_cs) begin
state <= 3'b011;
end
end
3'b011: begin // Output received data
data_out <= shift_reg;
state <= 3'b000;
end
endcase
end
end
endmodule
```
这个代码演示了一个简单的SPI接收器模块,它在接收到有效的CS信号后开始接收数据,然后在接收完8位数据后将其输出。你可以根据实际需求进行修改和扩展。请注意,这只是一个示例代码,实际应用中可能需要根据具体的FPGA平台和外围设备进行适当的调整和配置。