例程：demo_fft_spectrum.py
from Maix import GPIO, I2S, FFT
import image, lcd, math
from fpioa_manager import fm
sample_rate = 38640
sample_points = 1024
fft_points = 512
hist_x_num = 50
lcd.init(freq=15000000)
close WiFi
fm.register(8, fm.fpioa.GPIO0, force=True)
wifi_en=GPIO(GPIO.GPIO0,GPIO.OUT)
wifi_en.value(0)
from board import board_info
fm.register(34,fm.fpioa.I2S0_IN_D0, force=True)
fm.register(33,fm.fpioa.I2S0_WS, force=True) # 19 on Go Board and Bit(new version)
fm.register(35,fm.fpioa.I2S0_SCLK, force=True) # 18 on Go Board and Bit(new version)
rx = I2S(I2S.DEVICE_0)
rx.channel_config(rx.CHANNEL_0, rx.RECEIVER, align_mode = I2S.STANDARD_MODE)
rx.set_sample_rate(sample_rate)
img = image.Image()
if hist_x_num > 320:
hist_x_num = 320
hist_width = int(320 / hist_x_num)#changeable
x_shift = 0
while True:
audio = rx.record(sample_points)
fft_res = FFT.run(audio.to_bytes(),fft_points)
fft_amp = FFT.amplitude(fft_res)
img = img.clear()
x_shift = 0
for i in range(hist_x_num):
if fft_amp > 240:
hist_height = 240
else:
hist_height = fft_amp
img = img.draw_rectangle((x_shift,240-hist_height,hist_width,hist_height),[255,255,255],2,True)
x_shift = x_shift + hist_width
lcd.display(img)
fft_amp.clear()
没有任何反应
