写一段Verilog代码,使用IIC接口初始化ina226寄存器,并设置一个使能来读取测量值
时间: 2023-12-06 10:44:23 浏览: 68
以下是一个使用IIC接口初始化ina226寄存器,并设置一个使能来读取测量值的Verilog代码示例:
```
module ina226_iic(
input clk,
input rstn,
input en,
output reg [15:0] measurement
);
reg [7:0] addr;
reg [7:0] data;
reg [1:0] state;
reg scl;
reg sda;
wire sda_i;
// IIC时序
localparam IDLE = 2'b00;
localparam START = 2'b01;
localparam WRITE = 2'b10;
localparam READ = 2'b11;
// INA226寄存器地址
localparam CONFIG_REG = 8'h00;
localparam SHUNT_VOLTAGE_REG = 8'h01;
localparam BUS_VOLTAGE_REG = 8'h02;
// 初始化时写入的值
localparam CONFIG_VALUE = 8'h45; // Averaging 16, Conversion time 1070us, Continuous mode
// 初始化状态机
always @(posedge clk or negedge rstn) begin
if (!rstn) begin
state <= IDLE;
addr <= 0;
data <= 0;
scl <= 1;
sda <= 1;
end else begin
case (state)
IDLE: begin
scl <= 1;
sda <= 1;
if (en) begin
state <= START;
addr <= 8'b10000000; // INA226器件地址为0x40
end
end
START: begin
scl <= 1;
sda <= 0;
state <= WRITE;
end
WRITE: begin
scl <= 1;
sda <= data[7];
addr <= addr << 1;
data <= {data[6:0], 1'b0};
if (addr[7] == 1) begin
state <= IDLE;
end
end
READ: begin
scl <= 1;
sda <= 1;
state <= IDLE;
measurement <= {sda_i, sda};
end
endcase
end
end
// 仿真时使用,模拟IIC总线上的设备
initial begin
sda_i = 1;
end
// 按照INA226的初始化顺序写入配置寄存器和校准寄存器
always @(posedge clk) begin
case (state)
IDLE: begin
if (en) begin
data <= CONFIG_VALUE;
state <= START;
addr <= CONFIG_REG;
end
end
WRITE: begin
if (state == WRITE && addr == CONFIG_REG && sda == 1) begin
// 配置寄存器写入完成,开始写入校准寄存器
state <= START;
addr <= SHUNT_VOLTAGE_REG;
data <= 16'h0000;
end else if (state == WRITE && addr == SHUNT_VOLTAGE_REG && sda == 1) begin
// 校准寄存器写入完成,初始化完成
state <= IDLE;
end
end
READ: begin
// 读取测量值
state <= START;
addr <= BUS_VOLTAGE_REG;
end
endcase
end
endmodule
```
该代码实现了一个简单的IIC总线控制器,可以通过en使能信号来控制初始化过程。在初始化完成后,可以通过设置en信号来读取INA226的测量值,读取的值存储在measurement寄存器中。需要注意的是,这段代码中没有实现IIC总线的时钟同步,因此实际使用时需要根据具体情况修改。