'''
Author       : Xu Dakang
Email        : XudaKang_up@qq.com
Date         : 2021-11-19 19:12:31
LastEditors  : Xu Dakang
LastEditTime : 2021-11-21 21:36:19
Filename     :
Description  :
'''

'''
模塊功能：
1.根據(jù)采樣點(diǎn)數(shù)，采樣周期數(shù)等參數(shù)以及波形的數(shù)學(xué)表達(dá)式，生成任意波形
2.將波形數(shù)據(jù)轉(zhuǎn)為指定位寬的二進(jìn)制補(bǔ)碼，然后存為txt
3.繪制原始波形和轉(zhuǎn)換為二進(jìn)制補(bǔ)碼后的波形，驗(yàn)證轉(zhuǎn)換是否正確
'''

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.pylab import mpl

mpl.rcParams['font.sans-serif'] = ['SimHei']  #顯示中文
mpl.rcParams['axes.unicode_minus'] = False  #顯示負(fù)號(hào)
import mplcursors
import time

now_time = time.strftime("%Y%m%d-%H%M%S", time.localtime(time.time()))

# 我的自編模塊
import myBin2dec2hex

#! 需要變更的參數(shù)
file_name = 'waveform-' + now_time

N = 250  # 一個(gè)周期的采樣點(diǎn)數(shù)，采樣頻率Fs = 信號(hào)頻率f * 采樣點(diǎn)數(shù)N
TNUM = 10  # 采樣周期數(shù)
BIT_WIDTH = 24  # 二進(jìn)制補(bǔ)碼位數(shù)
f = 0.5  # 正弦信號(hào)的頻率，可任意取值

t0 = np.linspace(0, 1 / f, N)  # np.linspace(開始, 結(jié)束, 個(gè)數(shù))，注意開始點(diǎn)會(huì)被包含，結(jié)束點(diǎn)可能被包含(如果能整除的話)
pi = np.pi

#! 更改y0的表達(dá)式以獲得任意波形
# 正弦函數(shù)公式 y = sin(wt) = sin(2πft)
y0 = np.sin(2 * pi * f * t0) + np.sin(2 * pi * f * 2 * t0)
# y0 = np.sin(2 * pi * f * t0)

#! 原始波形周期延拓，并繪制出延拓后的波形
x0_tnum = []
y0_tnum = []
y0_bit_tnum = []
for i in range(TNUM):
    for j in t0:
        x0_tnum.append(j + i * 1 / f)
    for k in y0:
        y0_tnum.append(k)
plt.figure(1)
plt.subplot(2, 1, 1)
plt.plot(x0_tnum, y0_tnum)
plt.grid()
plt.title('原始波形，最小頻率 = ' + str(f) + '對(duì)應(yīng)周期為' + str(1/f)
          + '，周期數(shù) = ' + str(TNUM) + '，采樣頻率 = ' + str(f * N))
mplcursors.cursor() # 使得可以在圖像上取點(diǎn)

#! 原始波形小數(shù)乘以二進(jìn)制放大倍數(shù)再取整
y0_bit = np.int0((2**(BIT_WIDTH - 1) - 1) * y0 / max(abs(y0)))
y0_bit_tnum = []
for i in range(TNUM):
    for j in y0_bit:
        y0_bit_tnum.append(j)

#! 將10進(jìn)制轉(zhuǎn)2進(jìn)制補(bǔ)碼，再存入txt文件中
fotxt = ''
fo = open(file_name + '.txt', 'w', encoding='utf8')
for dec_num in y0_bit_tnum:  # 不包括最后一個(gè)數(shù)
    fotxt += myBin2dec2hex.signed_dec2bin(dec_num, BIT_WIDTH)[2:] + '\n'
fo.write(fotxt[:-1])
print('生成' + file_name + '.txt文件成功！')
fo.close()

#! 讀取寫入的txt文件，轉(zhuǎn)為10進(jìn)制并畫出波形，以驗(yàn)證寫入是否正確
fi = open(file_name + '.txt', 'r', encoding='utf8')

y_out = []
for line in fi.readlines():
    y_out.append(myBin2dec2hex.signed_bin2dec(line))
fi.close()

x_out = list(range(len(x0_tnum)))

plt.figure(1)
plt.subplot(2, 1, 2)
plt.plot(x_out, y_out)
plt.grid()
plt.title('先轉(zhuǎn)二進(jìn)制補(bǔ)碼再轉(zhuǎn)10進(jìn)制后波形, 相當(dāng)于十進(jìn)制值乘以2^' + str(BIT_WIDTH - 1) + ' - 1即'
            + str('{:e}'.format(2**(BIT_WIDTH - 1) - 1)))
mplcursors.cursor()
plt.show()