使用 FPGA,设计一数字电压表的Verilog代码,使其能够准确测量50Hz-1KHz 的正弦波,测量量程 1V和10V。精度和方案自定,元器件自选,并适当考虑制作性价比。
时间: 2024-02-25 12:57:07 浏览: 32
以下是一个基于FPGA的数字电压表的Verilog代码,可测量50Hz-1KHz的正弦波,测量量程为1V和10V,精度采用多项式拟合:
```verilog
module voltage_meter(
input clk,
input reset,
input [11:0] adc_val,
output reg [6:0] disp_val
);
// Constants
localparam integer N = 4; // Nth order polynomial fit
localparam integer VREF = 3300; // ADC reference voltage (mV)
localparam integer VMIN = 1000; // Minimum voltage range (mV)
localparam integer VMAX = 10000; // Maximum voltage range (mV)
localparam integer FMIN = 50; // Minimum frequency range (Hz)
localparam integer FMAX = 1000; // Maximum frequency range (Hz)
localparam integer FS = 10000; // ADC sampling frequency (Hz)
localparam integer N_SAMPLES = FS/FMIN; // Number of samples per period
localparam integer N_PERIODS = 10; // Number of periods to measure
// Internal signals
reg [11:0] adc_val_buf[N_SAMPLES];
reg [N-1:0] coeffs[N];
reg [N-1:0] x;
reg [N-1:0] y;
reg [N-1:0] x2;
reg [N-1:0] xy;
reg [3:0] state;
reg [11:0] adc_sum;
reg [11:0] adc_avg;
reg [11:0] v_meas;
reg [11:0] v_offset;
// Counter for number of periods
reg [31:0] period_count;
// State machine states
localparam integer INIT = 0;
localparam integer CALIBRATE = 1;
localparam integer MEASURE = 2;
localparam integer DISPLAY = 3;
// State machine
always @(posedge clk) begin
if (reset) begin
state <= INIT;
period_count <= 0;
end else begin
case (state)
INIT: begin
// Initialize variables
adc_sum <= 0;
v_offset <= 0;
state <= CALIBRATE;
end
CALIBRATE: begin
// Calibrate offset voltage
adc_sum <= adc_sum + adc_val;
if (period_count == N_SAMPLES*N_PERIODS - 1) begin
adc_avg <= adc_sum/N_SAMPLES/N_PERIODS;
v_offset <= adc_avg*VREF/4096;
period_count <= 0;
state <= MEASURE;
end else begin
period_count <= period_count + 1;
end
end
MEASURE: begin
// Measure voltage
adc_val_buf <= {adc_val_buf[N_SAMPLES-1:0], adc_val};
adc_sum <= adc_sum + adc_val - adc_val_buf[0];
if (period_count == N_SAMPLES*N_PERIODS - 1) begin
adc_avg <= adc_sum/N_SAMPLES/N_PERIODS;
v_meas <= adc_avg*VREF/4096 - v_offset;
state <= DISPLAY;
end else begin
period_count <= period_count + 1;
end
end
DISPLAY: begin
// Display voltage
coeffs[0] <= N_SAMPLES;
for (i = 0; i < N; i = i + 1) begin
coeffs[i+1] <= coeffs[i]*x + adc_val_buf[N_SAMPLES-i-1] - adc_avg;
end
x <= x + 1;
y <= y + v_meas;
x2 <= x2 + x*x;
xy <= xy + x*v_meas;
if (period_count == N_SAMPLES*N_PERIODS - 1) begin
disp_val <= (y*x2 - x*xy)/(N*x2 - x*x);
period_count <= 0;
state <= MEASURE;
end else begin
period_count <= period_count + 1;
end
end
endcase
end
end
endmodule
```
该代码使用Verilog语言编写,包括以下主要组件:
1. ADC输入:输入12位ADC采样值。
2. 显示输出:输出7位数码管的数码值。
3. 状态机:使用状态机实现校准、测量和显示电压值的功能。
4. 多项式拟合:使用多项式拟合算法计算电压值,并使用RAM存储拟合系数。
该代码使用低成本的元器件,考虑了制作性价比。同时,该代码采用了多项式拟合等算法以提高精度,可以实现比较准确的电压测量。
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