Rename the CIRCUITPY drive to something new
For instance, if you have multiple of the same device. The label can be up to 11 characters. This goes in boot.py not code.py and you must power cycle the board after the change.
# this goes in boot.py not code.py!
new_name = "TRINKEYPY0"
import storage
storage.remount("/", readonly=False)
m = storage.getmount("/")
m.label = new_name
storage.remount("/", readonly=True)
import supervisor if supervisor.runtime.usb_connected: led.value = True # USB else: led.value = False # no USB
An older way that tries to mount CIRCUITPY read-write and if it fails, USB is connected:
def is_usb_connected():
import storage
try:
storage.remount('/', readonly=False) # attempt to mount readwrite
storage.remount('/', readonly=True) # attempt to mount readonly
except RuntimeError as e:
return True
return False
is_usb = "USB" if is_usb_connected() else "NO USB"
print("USB:", is_usb)
import os
fs_stat = os.statvfs('/')
print("Disk size in MB", fs_stat[0] * fs_stat[2] / 1024 / 1024)
print("Free space in MB", fs_stat[0] * fs_stat[3] / 1024 / 1024)
import microcontroller microcontroller.on_next_reset(microcontroller.RunMode.BOOTLOADER) microcontroller.reset()
USB Serial
Print to USB Serial
print("hello there") # prints a newline
print("waiting...", end='') # does not print newline
for i in range(256): print(i, end=', ') # comma-separated numbers
while True:
print("Type something: ", end='')
my_str = input() # type and press ENTER or RETURN
print("You entered: ", my_str)
import time
import supervisor
print("Type something when you're ready")
last_time = time.monotonic()
while True:
if supervisor.runtime.serial_bytes_available:
my_str = input()
print("You entered:", my_str)
if time.monotonic() - last_time > 1: # every second, print
last_time = time.monotonic()
print(int(last_time),"waiting...")
import time, sys, supervisor
print("type characters")
while True:
n = supervisor.runtime.serial_bytes_available
if n > 0: # we read something!
s = sys.stdin.read(n) # actually read it in
# print both text & hex version of recv'd chars (see control chars!)
print("got:", " ".join("{:s} {:02x}".format(c,ord(c)) for c in s))
time.sleep(0.01) # do something else
class USBSerialReader:
""" Read a line from USB Serial (up to end_char), non-blocking, with optional echo """
def __init__(self):
self.s = ''
def read(self,end_char='\n', echo=True):
import sys, supervisor
n = supervisor.runtime.serial_bytes_available
if n > 0: # we got bytes!
s = sys.stdin.read(n) # actually read it in
if echo: sys.stdout.write(s) # echo back to human
self.s = self.s + s # keep building the string up
if s.endswith(end_char): # got our end_char!
rstr = self.s # save for return
self.s = '' # reset str to beginning
return rstr
return None # no end_char yet
usb_reader = USBSerialReader()
print("type something and press the end_char")
while True:
mystr = usb_reader.read() # read until newline, echo back chars
#mystr = usb_reader.read(end_char='\t', echo=False) # trigger on tab, no echo
if mystr:
print("got:",mystr)
time.sleep(0.01) # do something time critical
Page last edited March 08, 2024
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