micropython/ports/teensy
David Grayson c046b23ea2 shared/runtime/pyexec: Don't allow Ctrl+C to interrupt frozen boot code.
Helps prevent the filesystem from getting formatted by mistake, among other
things.  For example, on a Pico board, entering Ctrl+D and Ctrl+C fast many
times will eventually wipe the filesystem (without warning or notice).

Further rationale: Ctrl+C is used a lot by automation scripts (eg mpremote)
and UI's (eg Mu, Thonny) to get the board into a known state.  If the board
is not responding for a short time then it's not possible to know if it's
just a slow start up (eg in _boot.py), or an infinite loop in the main
application.  The former should not be interrupted, but the latter should.
The only way to distinguish these two cases would be to wait "long enough",
and if there's nothing on the serial after "long enough" then assume it's
running the application and Ctrl+C should break out of it.  But defining
"long enough" is impossible for all the different boards and their possible
behaviour.  The solution in this commit is to make it so that frozen
start-up code cannot be interrupted by Ctrl+C.  That code then effectively
acts like normal C start-up code, which also cannot be interrupted.

Note: on the stm32 port this was never seen as an issue because all
start-up code is in C.  But now other ports start to put more things in
_boot.py and so this problem crops up.

Signed-off-by: David Grayson <davidegrayson@gmail.com>
2023-04-05 10:38:50 +10:00
..
core drivers,ports: Fix a few typos in comments. 2022-07-23 23:24:24 +10:00
memzip_files all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
Makefile shared/runtime/gchelper: Drop cpu directive from ARM asm helpers. 2023-01-28 15:51:38 +11:00
README.md stm32,teensy: Correct typos in project README files. 2021-04-28 00:29:18 +10:00
add-memzip.sh
hal_ftm.c all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
hal_ftm.h all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
hal_gpio.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
help.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
lcd.c all: Update Makefiles and others to build with new ports/ dir layout. 2017-09-06 14:09:13 +10:00
led.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
led.h
lexerfrozen.c py/builtin: Clean up and simplify import_stat and builtin_open config. 2022-05-25 13:04:45 +10:00
lexermemzip.h
main.c shared/runtime/pyexec: Don't allow Ctrl+C to interrupt frozen boot code. 2023-04-05 10:38:50 +10:00
make-pins.py all: Update Python code to conform to latest black formatting. 2020-08-29 15:18:01 +10:00
manifest.py teensy: Switch to use manifest.py instead of FROZEN_DIR. 2021-12-17 23:54:05 +11:00
mk20dx256.ld
mk20dx256_af.csv
mk20dx256_prefix.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
modpyb.c py/gc: Make gc_dump_info/gc_dump_alloc_table take a printer as argument. 2023-03-10 10:58:10 +11:00
mpconfigport.h teensy/teensy_hal: Use MP_REGISTER_ROOT_POINTER(). 2022-07-18 13:50:35 +10:00
pin_defs_teensy.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
pin_defs_teensy.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
qstrdefsport.h all: Add *FORMAT-OFF* in various places. 2020-02-28 10:31:07 +11:00
reg.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
reg.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
servo.c all: Use mp_obj_malloc everywhere it's applicable. 2022-05-03 22:28:14 +10:00
servo.h
std.h
teensy_hal.c ports: Implement simple write polling for stdout. 2023-03-23 13:51:17 +11:00
teensy_hal.h all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
teensy_pins.csv
timer.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
timer.h
uart.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
uart.h teensy: Add own uart.h to not rely on stm32's version of the file. 2018-12-10 23:55:11 +11:00
usb.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
usb.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00

README.md

Build Instructions for Teensy 3.1

Currently the Teensy 3.1 port of MicroPython builds under Linux and not under Windows.

The tool chain required for the build can be found at https://launchpad.net/gcc-arm-embedded.

Download the current Linux *.tar.bz2 file. Instructions regarding unpacking the file and moving it to the correct location as well as adding the extracted folders to the environment variable can be found at http://eliaselectronics.com/stm32f4-tutorials/setting-up-the-stm32f4-arm-development-toolchain/

In order to download the firmware image to the teensy, you'll need to use the downloader included with TeensyDuino. The following assumes that you have TeensyDuino installed and set the ARDUINO environment variable pointing to the where Arduino with TeensyDuino is installed.

cd teensy
ARDUINO=~/arduino-1.0.5 make

To upload MicroPython to the Teensy 3.1.

Press the Program button on the Teensy 3.1

sudo ARDUINO=~/arduino-1.0.5/ make deploy

Currently, the Python prompt is through the USB serial interface, i.e.

minicom -D /dev/ttyACM0

TIPS

Install 49-teensy.rules into /etc/udev/rules.d

If you install the 49-teensy.rules file from http://www.pjrc.com/teensy/49-teensy.rules into your /etc/udev/rules.d folder then you won't need to use sudo:

sudo cp ~/Downloads/49-teensy.rules /etc/udev/rules.d
sudo udevadm control --reload-rules

Unplug and replug the teensy board, and then you can use: ARDUINO=~/arduino-1.0.5/ make deploy

Create a GNUmakefile to hold your ARDUINO setting.

Create a file call GNUmakefile (note the lowercase m) in the teensy folder with the following contents:

$(info Executing GNUmakefile)

ARDUINO=${HOME}/arduino-1.0.5
$(info ARDUINO=${ARDUINO})

include Makefile

GNUmakefile is not checked into the source code control system, so it will retain your settings when updating your source tree. You can also add additional Makefile customizations this way.

Tips for OSX

Set the ARDUINO environment variable to the location where Arduino with TeensyDuino is installed.

export ARDUINO=~/Downloads/Arduino.app/Contents/Java/

Search /dev/ for USB port name, which will be cu.usbmodem followed by a few numbers. The name of the port maybe different depending on the version of OSX. To access the Python prompt type:

screen <devicename> 115200