teensyuser / doc

Teensy PJRC WIKI

Teensy User WIKI

This repository hosts a WIKI for the PJRC Teensy boards.

• This way to the PJRC Forum: https://forum.pjrc.com
• This way to the WIKI: https://github.com/TeensyUser/doc/wiki

doc's Issues

pin.h update

For the future you might change pin.h in pinList to read
#elif defined(ARDUINO_TEENSY40) || defined (ARDUINO_TEENSY41)

Pictures for "Better Callbacks"

Pictures for WIKI page: Better Callbacks

Should print "INPUT_PULLDOWN"

doc/examples/GPIO/gpio/gpio.ino

Line 17 in 62e9630

Serial.println("\nUsing INPUT_PULLUP:");

FAQ Structure

Looks like the FAQ is going to get a nightmare to maintain when it grows.

What about having the table of content on the FAQ landing page only and then do a separate page for each item with a "back" link to the FAQ landing page?.
That would also make the linking much easier (could use standard [[pagename]] links then)
(Would look as simple as the code in the sidebar)

Not able to teensy.write/read in python.

Default Code:

import hid
from urllib import request
import json

hidInterfaces = hid.enumerate()          # get all hid interfaces
t_it = filter(lambda t:                  # filter by vid and usagepage/usage
  t['vendor_id']  == 0x16c0 and
  t['usage_page'] == 0xFFAB and
  t['usage']      == 0x0200, hidInterfaces)

rawHID_interface = next(t_it, None)      # 'firstOrDefault'

if rawHID_interface != None:
   teensy = hid.Device(path = rawHID_interface["path"])

   for i in range(10):
     jsonurl = request.urlopen("https://api.adviceslip.com/advice")
     slip = '\0' + json.loads(jsonurl.read())['slip']['advice']  # the sent report must always start with \0
     teensy.write(slip.encode()[:64])                            # rawHID report is 64 bytes long

Error:

  File "hid.pyx", line 164, in hid.device.write
ValueError: not open

Does anyone know what error is this?

Not all data in DMAMEM/RAM2 survives a warm reset/restart

In : https://github.com/TeensyUser/doc/wiki/The-Watchdog-timer

This is not entirely true. Some portion of lower (?) DMAMEM is used by the security HAB (?) code before startup and data stored there will be wiped and overwritten. There is a forum post somewhere - or it could be tested - some 32KB (???) area is disturbed as the processor wakes up and verifies chip security. Any area above that - that was flushed from cache - will be retained. The area used may be different between Locked and UnLocked as well???

// DMAMEM causes allocation in 'static' RAM2 on Teensy using 1062 processor
// It is not initialized and will retain value while powered
// BUT - it writes through a cache that must be flushed to assure it is current
// This works for any DMAMEM allocation of any variable type or structure

Pictures - copy your pictures here for linking from the wiki

Things to add

** Portable version is handy: https://forum.pjrc.com/threads/60026-Windows-10-app-vs-downloaded-Arduino-app?p=232963&viewfull=1#post232963

** note on interrupts in general and the 1062 and dsb?

** page on TyCommander