写一段Verilog代码,按照IIC协议,初始化ina226寄存器,并设置一个使能来读取测量值
时间: 2023-12-06 21:44:29 浏览: 138
用VERILOG编写的IIC协议
下面是一个简单的Verilog代码示例,用于初始化ina226寄存器并读取测量值。该代码使用IIC协议进行通信。
```
module ina226_i2c(
input i2c_scl,
input i2c_sda,
output reg en,
output reg [15:0] measurement
);
reg [7:0] reg_addr;
reg [7:0] write_data;
reg [7:0] read_data;
reg [3:0] state;
assign i2c_sda_out = (state == 2);
// I2C state machine
always @ (posedge i2c_scl or posedge i2c_sda) begin
case(state)
0: begin // Start condition
state <= 1;
reg_addr <= 16'h00; // Register address to write to
write_data <= 8'h80; // Reset the INA226 device
read_data <= 8'h00;
en <= 0;
end
1: begin // Write register address
if(i2c_sda == 0) begin
state <= 2;
end
end
2: begin // Write data
if(i2c_sda == 0) begin
state <= 3;
end
end
3: begin // Stop condition
state <= 4;
end
4: begin // Start condition
state <= 5;
reg_addr <= 16'h02; // Register address to read from
write_data <= 8'h00;
en <= 1;
end
5: begin // Write register address
if(i2c_sda == 0) begin
state <= 6;
end
end
6: begin // Start condition
state <= 7;
reg_addr <= 16'h02; // Register address to read from
write_data <= 8'h00;
en <= 1;
end
7: begin // Read data
if(i2c_sda == 1) begin
measurement <= {read_data, 8'h00}; // Combine the two bytes
state <= 8; // Stop condition
end else begin
read_data <= {read_data[6:0], i2c_sda}; // Shift in the bit
end
end
8: begin // Idle
state <= 0;
end
endcase
end
endmodule
```
在这个代码中,我们使用一个有限状态机来控制IIC通信。初始状态为0,表示等待启动条件。当i2c_scl和i2c_sda信号检测到启动条件时,状态机会转移到状态1,表示写入寄存器地址。状态2和3表示写入数据。状态4表示启动条件,状态5表示写入寄存器地址,状态6表示启动条件,状态7表示读取数据。读取数据时,我们将两个字节合并为一个16位的测量值,并在状态8中完成。
此外,我们还输出了一个使能信号,用于触发读取测量值的操作。该信号在状态4和6中设置为1,在状态7中重置为0。
阅读全文