c7404a3ff8
This allows calls to `allocate_memory()` while the VM is running, it will then allocate from the GC heap (unless there is a suitable hole among the supervisor allocations), and when the VM exits and the GC heap is freed, the allocation will be moved to the bottom of the former GC heap and transformed into a proper supervisor allocation. Existing movable allocations will also be moved to defragment the supervisor heap and ensure that the next VM run gets as much memory as possible for the GC heap. By itself this breaks terminalio because it violates the assumption that supervisor_display_move_memory() still has access to an undisturbed heap to copy the tilegrid from. It will work in many cases, but if you're unlucky you will get garbled terminal contents after exiting from the vm run that created the display. This will be fixed in the following commit, which is separate to simplify review.
CircuitPython port to Spresense
This directory contains the port of CircuitPython to Spresense. It is a compact development board based on Sony’s power-efficient multicore microcontroller CXD5602.
Board features:
- Integrated GPS
- The embedded GNSS with support for GPS, QZSS and GLONASS enables applications where tracking is required.
- Hi-res audio output and multi mic inputs
- Advanced 192kHz/24 bit audio codec and amplifier for audio output, and support for up to 8 mic input channels.
- Multicore microcontroller
- Spresense is powered by Sony's CXD5602 microcontroller (ARM® Cortex®-M4F × 6 cores), with a clock speed of 156 MHz.
Currently, Spresense port does not support Audio and Multicore.
Refer to developer.sony.com/develop/spresense/ for further information about this board.
Prerequisites
Linux
Add user to dialout group:
$ sudo usermod -a -G dialout <user-name>
Windows
Download and install USB serial driver
macOS
Download and install USB serial driver
Build instructions
Pull all submodules into your clone:
$ git submodule update --init --recursive
Build the MicroPython cross-compiler:
$ make -C mpy-cross
Change directory to cxd56:
$ cd ports/cxd56
To build circuitpython image run:
$ make BOARD=spresense
USB connection
Connect the Spresense main board to the PC via the USB cable.
Flash the bootloader
The correct bootloader is required for the Spresense board to function.
Bootloader information:
-
The bootloader has to be flashed the very first time the board is used.
-
You have to accept the End User License Agreement to be able to download and use the Spresense bootloader binary.
Download the spresense binaries zip archive from: Spresense firmware v2-0-000
Extract spresense binaries in your PC to ports/spresense/spresense-exported-sdk/firmware/
To flash the bootloader run the command:
$ make BOARD=spresense flash-bootloader
Flash the circuitpython image
To flash the firmware run the command:
$ make BOARD=spresense flash
Accessing the board
Connect the Spresense extension board to the PC via the USB cable.
Once built and deployed, access the CircuitPython REPL (the Python prompt) via USB. You can run:
$ screen /dev/ttyACM0 115200