Everyone 
's the RPI Pico!
What are some random uses for a RPI Pico?
-Power Supply (The pico has a buck-boost DCDC converter outputting 3.3V @ 1A)
-USB Serial Adapter (use the https://github.com/raspberrypi/picoprobe firmware for a USB-Uart Converter, no more FTDI breakout boards!)
-Logic analyzer https://github.com/pico-coder/sigrok-pico
-Oscilloscope https://github.com/fhdm-dev/scoppy
-Microphone
Jan's USBTMC DAQ
What's your favorite random use for a Pico
A totally random use case I am trying is to use a Pico like a programable oscillator like the Si5351
We will see if it works out...
Its a start (totally random use for a pico...)
Hopping between two feedback divider values.
Its too bad the PLLs don't have fractional feedback dividers
There is still a lot of register combinations to arrive at many different discrete output frequencies.
I'll keep tinkering away...
Its a start (totally random use for a pico...)
Hopping between two feedback divider values.
Its too bad the PLLs don't have fractional feedback dividers
There is still a lot of register combinations to arrive at many different discrete output frequencies.
I'll keep tinkering away...
Using RPI Python Calculator for now: *snip* https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2_common/hardware_clocks/scripts/vcocalc.py
@micropython.native
def calc(output,input=12,ref_min=5,vco_max=1600,vco_min=750,low_vco=False):
# Fixed hardware parameters
fbdiv_range = range(16, 320 + 1)
postdiv_range = range(1, 7 + 1)
ref_min = 2#5
refdiv_min = 1
refdiv_max = 63
refdiv_range = range(refdiv_min, max(refdiv_min, min(refdiv_max, int(input / ref_min))) + 1)
best = (0, 0, 0, 0, 0)
best_margin = output
for refdiv in refdiv_range:
for fbdiv in (fbdiv_range if low_vco else reversed(fbdiv_range)):
vco = input / refdiv * fbdiv
if vco < vco_min or vco > vco_max:
continue
# pd1 is inner loop so that we prefer higher ratios of pd1:pd2
for pd2 in postdiv_range:
for pd1 in postdiv_range:
out = vco / pd1 / pd2
margin = abs(out - output)
if margin < best_margin:
best = (out, fbdiv, pd1, pd2, refdiv)
best_margin = margin
print("Requested: {} MHz".format(output))
print("Achieved: {} MHz".format(best[0]))
print("Error: {} MHz".format(best[0]-output))
print("REFDIV: {}".format(best[4]))
print("FBDIV: {} (VCO = {} MHz)".format(best[1], input / best[4] * best[1]))
print("PD1: {}".format(best[2]))
print("PD2: {}".format(best[3]))
return {'REFDIV':best[4], 'FBDIV':best[1], 'PD1':best[2], 'PD2':best[3]}
And 200 MHz
