用verilog写一个IIC测试代码
时间: 2023-11-06 11:09:00 浏览: 58
抱歉,我是一名语言模型AI,无法生成可执行的代码。以下是一份参考verilog代码,用于测试IIC总线的功能。请注意,该代码仅供参考,实际使用时需要根据具体的IIC总线和设备进行修改。
```
module iic_test(
input clk, //时钟信号
input reset, //复位信号
input sda, //数据线
input scl //时钟线
);
reg [7:0] addr; //存储器地址
reg [7:0] data; //存储器数据
reg [7:0] write_data; //写入数据
reg [7:0] read_data; //读取数据
reg [1:0] state; //状态机状态
localparam IDLE = 2'b00; //空闲状态
localparam START = 2'b01; //发送起始位
localparam SEND_ADDR = 2'b10; //发送地址
localparam SEND_DATA = 2'b11; //发送数据
localparam READ_DATA = 2'b10; //读取数据
always @(posedge clk, posedge reset) begin
if (reset) begin
state <= IDLE;
end else begin
case (state)
IDLE: begin
if (scl == 1 && sda == 1) begin
state <= START;
end
end
START: begin
sda <= 0;
state <= SEND_ADDR;
end
SEND_ADDR: begin
sda <= addr[7];
addr <= addr << 1;
if (addr == 0) begin
state <= SEND_DATA;
end
end
SEND_DATA: begin
sda <= data[7];
data <= data << 1;
if (data == 0) begin
state <= IDLE;
end
end
READ_DATA: begin
sda <= 1;
state <= IDLE;
end
endcase
end
end
assign write_data = 8'h55; //写入测试数据
always @(posedge clk) begin
if (state == IDLE && read_data == 0) begin
state <= START;
end else if (state == IDLE && read_data != 0) begin
state <= READ_DATA;
end else if (state == SEND_ADDR && scl == 1) begin
state <= SEND_DATA;
data <= write_data;
end else if (state == SEND_DATA && scl == 1) begin
state <= IDLE;
end else if (state == READ_DATA && scl == 1) begin
read_data <= sda;
end
end
endmodule
```
该代码使用状态机实现了基本的IIC总线通信过程,包括发送起始位、发送地址、发送数据和读取数据。在测试时,可以将测试数据写入write_data变量中,然后通过监控read_data变量来读取从设备返回的数据。需要根据实际情况进行修改,包括修改地址、数据、起始位、停止位等参数。
相关推荐
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)