写一段FPGA进行IIC通讯的VERILOG程序
时间: 2023-03-14 09:00:30 浏览: 62
可以这样写:module IIC_communication (
input clk,
input scl,
input sda,
output [7:0] data_out,
input [7:0] data_in
);
// 申明寄存器
reg [7:0] data_reg;
reg [7:0] data_count;
reg scl_signal;
reg sda_signal;
reg start_signal;
reg write_signal;
reg stop_signal;
// 时钟触发
always @(posedge clk) begin
// 检测SCL, SDA信号
if (scl == 1'b1) begin
scl_signal <= 1'b1;
end else begin
scl_signal <= 1'b0;
end
if (sda == 1'b1) begin
sda_signal <= 1'b1;
end else begin
sda_signal <= 1'b0;
end
// 检测START信号
if (scl_signal == 1'b1 && sda_signal == 1'b0) begin
start_signal <= 1'b1;
write_signal <= 1'b1;
data_count <= 8'b0;
data_reg <= 8'b0;
end
// 检测STOP信号
if (scl_signal == 1'b1 && sda_signal == 1'b1 && write_signal == 1'b1) begin
write_signal <= 1'b0;
stop_signal <= 1'b1;
end
// 写入数据
if (write_signal == 1'b1) begin
data_reg[data_count] <= sda_signal;
data_count <= data_count + 1;
if (data_count == 8) begin
data_out <= data_reg;
end
end
end
endmodule