jdmichaud

// reference: https://popovicu.com/posts/789-kb-linux-without-mmu-riscv/

How to create a linux kernel that can run on a riscv32ima without an MMU.

• Download buildroot
• Untar it and start make menuconfig
• In Target Options
  • Target Architecture select RISCV
  • In Target Architecture Size select 32
• In Target ABI select ilp32

jdmichaud

# Some sane config values
EXTRACT_ALL           = YES
CLASS_DIAGRAMS        = YES
HIDE_UNDOC_RELATIONS  = NO
HAVE_DOT              = YES
CLASS_GRAPH           = YES
COLLABORATION_GRAPH   = YES
UML_LOOK              = YES
UML_LIMIT_NUM_FIELDS  = 50
TEMPLATE_RELATIONS    = YES

jdmichaud

ARTIFACTORY_DOMAIN=$(grep '^registry=' ~/.npmrc | awk -F'=' '{print $2}' | awk -F/ '{print $3}')
ARTIFACTORY_TOKEN=$(grep '^//${ARTIFACTORY_DOMAIN}' ~/.npmrc | \
  awk -F':' '{ print $2 }' | \
  awk -F'_auth=' '{ print $2 }' | \
  tr -d '"\r' | \
  base64 -d | \
  awk -F':' '{ print $2 }')

curl -H "Authorization: Bearer ${ARTIFACTORY_TOKEN}" \
     "https://${ARTIFACTORY_DOMAIN}/artifactory/api/storage/${PATH_TO_RESOURCE}?list&deep=1&listFolders=1&mdTimestamps=1" \

jdmichaud

// Broken implementation
function hash(s) {
  let hash = new Uint32Array(1);
  hash[0] = 0;
  for (let i = 0; i < s.length; ++i) {
    const c = s[i].charCodeAt(0);
    hash[0] += c;
    hash[0] += (hash[0] << 10);
    hash[0] ^= (hash[0] >> 6);
  }

jdmichaud

Check you display configuration:

xrandr

To clone your computer screen to a different output:

xrandr --output <TV> --same-as <computer-screen>

jdmichaud

rest
[ 9030.422503] xpad-dbg: 00000000: 00 00 0f 7f 7f 7f 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 9030.422526] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

up
[ 9030.342505] xpad-dbg: 00000000: 00 00 0f 7f 00 7f 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 9030.342529] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

down
[ 9054.410631] xpad-dbg: 00000000: 00 00 0f 7f ff 7f 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

jdmichaud

State of the art: https://safjan.com/tools-for-doc-deskewing-and-dewarping/#what-to-use-for-unwarping-and-deskewing

vFlap: android app

List of apps: https://graphicdesign.stackexchange.com/questions/30948/best-way-to-flatten-a-curled-photographed-book-photograph

Process used: https://discourse.devontechnologies.com/t/three-cheers-for-the-free-vflat-app-for-de-warping-iphone-photos-of-book-pages/72523

Scan tailor, a QT app to stragithened scanned pages. https://github.com/scantailor/scantailor

jdmichaud

Create a systemd service

Create a unit file in /etc/systemd/system named foo.service. Then:

sudo systemctl start foo

If the file is modified:

sudo systemctl daemon-reload

jdmichaud

// cc -I/usr/include/hidapi/ -ggdb3 mouse.c -lhidapi-hidraw -o mouse
#include <stdio.h> // printf
#include <wchar.h> // wchar_t

#include <hidapi.h>
#include <string.h>

#define MAX_STR 255

int main(int argc, char* argv[])

jdmichaud

Program linkers link object file together to create either:

• An executable file
• A shared library

Dynamic linkers link the executing program to a shared library at runtime.

Basic data types

Defined symbols are static objects within the source code that are defined for the entirety of the program (function or global and static variables).