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tone.py
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tone.py
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import math
from pyb import DAC, micros, elapsed_micros
def tone1(freq):
t0 = micros()
dac = DAC(1)
while True:
theta = 2*math.pi*float(elapsed_micros(t0))*freq/1e6
fv = math.sin(theta)
v = int(126.0 * fv) + 127
#print("Theta %f, sin %f, scaled %d" % (theta, fv, v))
#delay(100)
dac.write(v)
def tone2(freq):
t0 = micros()
dac = DAC(1)
omega = 2 * math.pi * freq / 1e6
while True:
theta = omega*float(elapsed_micros(t0))
fv = math.sin(theta)
v = int(126.0 * fv) + 127
#print("Theta %f, sin %f, scaled %d" % (theta, fv, v))
#delay(100)
dac.write(v)
def tone3(freq, l_buf=256):
dac = DAC(1)
dtheta = 2 * math.pi / l_buf
scale = lambda fv: int(126.0 * fv) + 127
buf = bytearray(scale(math.sin(dtheta*t)) for t in range(l_buf))
dac.write_timed(buf, freq * l_buf, mode=DAC.CIRCULAR)
def tone4(freq, l_buf=256):
dac = DAC(1)
dtheta = 2 * math.pi / l_buf
scale = lambda fv: int(123 * fv) + 127
buf = bytearray(scale(math.sin(dtheta*t)) for t in range(l_buf))
dac.write_timed(buf, freq * l_buf, mode=DAC.CIRCULAR)
def tone5(freq, wavefun=lambda x: math.sin(2.0*math.pi*x), l_buf=256):
dac = DAC(1)
dt = 1.0 / l_buf
scale = lambda fv: int(123 * fv) + 127
buf = bytearray(scale(wavefun(t*dt)) for t in range(l_buf))
dac.write_timed(buf, freq * l_buf, mode=DAC.CIRCULAR)
def tone6(freq, wavefun=lambda x: math.sin(2.0*math.pi*x), l_buf=256, dacnum=1):
dac = DAC(dacnum)
dt = 1.0 / l_buf
scale = lambda fv: int(123 * fv) + 127
buf = bytearray(scale(wavefun(t*dt)) for t in range(l_buf))
dac.write_timed(buf, freq * l_buf, mode=DAC.CIRCULAR)