Verilog IIC接口程序
时间: 2024-01-19 22:03:16 浏览: 27
下面是一个简单的Verilog代码示例,用于实现IIC接口:
module iic_interface (
input clk, //时钟
input rst, //复位
input sda, //数据线
inout scl, //时钟线
output reg ack //应答信号
);
reg [7:0] i2c_address; //I2C设备地址
reg [7:0] i2c_data; //I2C数据
//I2C状态
parameter IDLE = 2'b00;
parameter START = 2'b01;
parameter ADDR = 2'b10;
parameter DATA = 2'b11;
reg [1:0] state; //当前状态
reg bit read; //读写标志
reg [7:0] count; //计数器
assign scl = state[1] ? ~scl : 1'b1; //时钟线控制
always @(posedge clk) begin
if (rst) begin //复位
state <= IDLE;
read <= 1'b0;
count <= 8'd0;
ack <= 1'b0;
end else begin
case (state)
IDLE: begin //空闲状态
if (~sda && ~scl) begin //START信号
state <= START;
count <= 8'd0;
i2c_address <= 8'd0;
i2c_data <= 8'd0;
read <= 1'b0;
ack <= 1'b0;
end
end
START: begin //发送START信号
if (count < 8'd1) begin
scl <= 1'b0;
count <= count + 1'b1;
end else begin
scl <= 1'b1;
state <= ADDR;
count <= 8'd0;
end
end
ADDR: begin //发送地址
if (count < 8'd7) begin
scl <= 1'b0;
i2c_address <= {i2c_address[6:0], read};
count <= count + 1'b1;
end else if (count == 8'd7) begin //发送读写标志
scl <= 1'b0;
i2c_address <= {i2c_address[6:0], read};
count <= count + 1'b1;
end else if (count == 8'd8) begin //读取ACK信号
scl <= 1'b1;
state <= DATA;
count <= 8'd0;
end
end
DATA: begin //发送/接收数据
if (count < 8'd7) begin //发送/接收数据位
scl <= 1'b0;
i2c_data <= {i2c_data[6:0], sda};
count <= count + 1'b1;
end else if (count == 8'd7) begin //发送/接收最后一位数据
scl <= 1'b0;
i2c_data <= {i2c_data[6:0], sda};
count <= count + 1'b1;
end else if (count == 8'd8) begin //读取ACK信号
scl <= 1'b1;
ack <= ~sda;
if (read) begin //读取数据
i2c_data <= {i2c_data[6:0], sda};
end
count <= 8'd0;
state <= IDLE;
end
endcase
end
end
endmodule
这段代码实现了一个简单的IIC接口,支持IIC设备的读写操作。在实际应用中,需要根据具体的设备和系统要求进行修改和优化。
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