raplin

/*
RPi frequency counter

We use the RPi's I2S input (on pin 38)

Setting up I2S input:
https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/raspberry-pi-wiring-test

Compile kernel module, modprobe it as described
(for RPI4 use 'modprobe snd-i2smic-rpi rpi_platform_generation=2')

raplin

# This card is pretty dope; gets hot at high MIMO tx power, needs cooling! Unclear if these listed TX powers are correct at the antenna port..

iw list
Wiphy phy1
        max # scan SSIDs: 10
        max scan IEs length: 2048 bytes
        max # sched scan SSIDs: 0
        max # match sets: 0
        max # scan plans: 1
        max scan plan interval: -1

raplin

#
# By Richard Aplin, released into the public domain for any purpose, no warranties implied, 8/17/2022
#
#
import struct
import serial

#Super lightweight code to read Hopi HP-9800 power meter

class Hopi(object):

raplin

class LED(object):
    RED=0x61
    GREEN=0x51
    BLUE=0x41
    PURPLE=0x31
    CYAN=0x21
    YELLOW=0x11
    WHITE=0x1
    OFF=0

raplin

import os,time
#import ioctl_opt
import fcntl,threading,Queue
import ctypes
import struct
import sys

_IOC_NRBITS = 8
_IOC_TYPEBITS = 8
_IOC_SIZEBITS = 14

raplin

 iw list
Wiphy phy1
        max # scan SSIDs: 16
        max scan IEs length: 195 bytes
        max # sched scan SSIDs: 0
        max # match sets: 0
        max # scan plans: 1
        max scan plan interval: -1
        max scan plan iterations: 0
        Retry short limit: 7

raplin

Cortex M CPU searchable IRQ/peripheral list

Goal: Use this when reverse engineering a binary for an unknown Cortex M CPU to help figure out exactly what you're looking at

Simple usage:
Load the binary into IDA/Ghidra
Find the vector table (usually the first 256-ish bytes right at the start of the file), and find some 'interesting' IRQ vectors that point to real code.
(The first 16 vectors are internal Cortex M stuff (reset vector, NMI etc) and will not be useful)
In the IRQ handler code pointed to by the vector, you will very often soon encounter an obvious peripheral address being loaded into a register.
Search this file for "[XXXX:YYYYYYYY]" where X = last 4 hex address of the IRQ vector, and YYYYYYYY=hex peripheral address.

raplin

import struct,time
import re

class CaptureEnd(Exception):
    pass

class Capture(object):
    def __init__(self,fileName,pins,opts,startOffset=0):
        self.f=open(fileName,"rb")
        self.f.seek(startOffset)