写一段Verilog代码,按照IIC时序,初始化ina226寄存器,并设置一个使能来读取测量值
时间: 2023-10-10 19:10:12 浏览: 80
i2c读写Verilog代码
以下是一个简单的Verilog代码示例,用于按照IIC时序初始化ina226寄存器并启用读取测量值:
```
module IIC_ina226 (
input clk,
input rst,
output reg SDA,
output reg SCL,
input reg EN
);
reg [7:0] INA_ADDR = 8'h40; // INA226设备地址
reg [7:0] REG_CONFIG = 8'h45; // 配置寄存器地址
reg [7:0] REG_SHUNT = 8'h01; // Shunt电压寄存器地址
reg [7:0] REG_BUS = 8'h02; // Bus电压寄存器地址
reg [15:0] config_data = 16'h4127; // 配置数据,设置INA226为连续模式,并启用测量
reg [7:0] reg_addr; // 寄存器地址
reg [15:0] reg_data; // 寄存器数据
reg [3:0] state; // 状态机状态
reg [7:0] bit_cnt; // 位计数器
reg [7:0] reg_cnt; // 寄存器地址计数器
reg [15:0] data_cnt; // 数据计数器
parameter IDLE = 2'b00;
parameter START = 2'b01;
parameter ADDR = 2'b10;
parameter DATA = 2'b11;
always @(posedge clk or posedge rst) begin
if (rst) begin
SDA <= 1'b1;
SCL <= 1'b1;
state <= IDLE;
bit_cnt <= 8'd0;
reg_cnt <= 8'd0;
data_cnt <= 16'd0;
end else begin
case (state)
IDLE: begin
SDA <= 1'b1;
SCL <= 1'b1;
if (EN) begin
state <= START;
end
end
START: begin
SDA <= 1'b0;
SCL <= 1'b1;
state <= ADDR;
bit_cnt <= 8'd0;
end
ADDR: begin
if (bit_cnt < 8) begin
SDA <= INA_ADDR[7-bit_cnt];
SCL <= 1'b0;
bit_cnt <= bit_cnt + 1;
end else begin
SDA <= 1'b1;
SCL <= 1'b1;
state <= DATA;
bit_cnt <= 8'd0;
end
end
DATA: begin
if (reg_cnt < 2) begin
reg_addr <= {REG_CONFIG, REG_SHUNT}[reg_cnt];
reg_data <= {config_data, 0}[reg_cnt];
end else begin
reg_addr <= REG_BUS;
end
if (bit_cnt < 8) begin
SDA <= reg_addr[7-bit_cnt];
SCL <= 1'b0;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt == 8) begin
SDA <= 1'b1;
SCL <= 1'b0;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt < 16) begin
SDA <= reg_data[15-bit_cnt];
SCL <= 1'b0;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt == 16) begin
SDA <= 1'b1;
SCL <= 1'b0;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt < 24) begin
SDA <= 1'b1;
SCL <= 1'b1;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt == 24) begin
SDA <= 1'b0;
SCL <= 1'b1;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt < 32) begin
SDA <= (data_cnt < 16) ? 1'b1 : reg_addr[7-bit_cnt+24];
SCL <= 1'b0;
data_cnt <= data_cnt + 1;
bit_cnt <= bit_cnt + 1;
end else if (bit_cnt == 32) begin
SDA <= 1'b1;
SCL <= 1'b0;
reg_cnt <= reg_cnt + 1;
bit_cnt <= 8'd0;
end else begin
SDA <= 1'b1;
SCL <= 1'b1;
state <= (reg_cnt < 3) ? ADDR : IDLE;
bit_cnt <= 8'd0;
end
end
endcase
end
end
endmodule
```
这个代码实现了一个状态机来控制SDA和SCL信号,以按照IIC时序向ina226写入寄存器地址和数据。在这个例子中,我们设置INA226为连续模式,并启用测量。一旦初始化完成,就可以使用EN使能信号来读取测量值。
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