def sinewave():
samples = 1024.0
amplitude = 2047.0 # P-P /2
i = 0
datalist = []
while i < samples:
value = numpy.sin((2 * numpy.pi) * (i / samples)) * amplitude
datalist.append(int(round(value)))
i = i + 1
# print datalist
p2c.print_c_list('int16_t', 'wt_sinewave', datalist)
def sinewave() :
samples=1024.0
amplitude=2047.0 # P-P /2
i=0
datalist=[]
while i < samples :
value=numpy.sin((2*numpy.pi)*(i/samples))*amplitude
datalist.append(int(round(value)))
i=i+1
# print datalist
p2c.print_c_list('int16_t', 'wt_sinewave', datalist)
def phasetable() :
keys=12
fractions=64 # steps in between each half note
base_freq=2093 # frequency of C7, base note of the highest supported octave
base_key=96 # MIDI key
pcm_freq=40178.0 # PCM playback sample rate
pcm_step_max=2**32 # 32 bit phase counters
i=0 # counter
datalist=[]
while i <= ( keys*fractions ) :
freq=base_freq*(2.0**(1.0/(keys*fractions)))**i
step=int(round(pcm_step_max/(pcm_freq/freq)))
# print i, freq, step
datalist.append(step)
i=i+1
p2c.print_c_list('const uint32_t', 'phasetable', datalist)
def phasetable():
keys = 12
fractions = 64 # steps in between each half note
base_freq = 2093 # frequency of C7, base note of the highest supported octave
base_key = 96 # MIDI key
pcm_freq = 40178.0 # PCM playback sample rate
pcm_step_max = 2**32 # 32 bit phase counters
i = 0 # counter
datalist = []
while i <= (keys * fractions):
freq = base_freq * (2.0**(1.0 / (keys * fractions)))**i
step = int(round(pcm_step_max / (pcm_freq / freq)))
# print i, freq, step
datalist.append(step)
i = i + 1
p2c.print_c_list('const uint32_t', 'phasetable', datalist)
extrasteps=255%octaves # extra table entries to cover the last entries in the
# 256 steps table.
p=0
div_list=[]
csel_list=[]
i=0 # counter
while i <= ( oct_steps * octaves + extrasteps ) :
# find out frequency ...
f=int(round(base_f*(2.0**(1.0/(oct_steps)))**i ))
# find timer divider ...
# x = 20M/200*f
x = cpuclk/2/(100*f)
csel=0x01 # AVR clock /1.
if x > 255 :
x = cpuclk/2/8/(100*f)
csel=0x02 # AVR clock /8
if x > 255 :
x = cpuclk/2/64/(100*f)
csel=0x03 # AVR clock /64
div_list.append(x)
csel_list.append(csel)
i=i+1
# print i,f,x,csel
p2c.print_c_list('uint8_t', 'divider', div_list, ' PROGMEM')
p2c.print_c_list('uint8_t', 'prescaler', csel_list, ' PROGMEM')
