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FROM debian:trixie as build

WORKDIR /build

RUN apt update && apt -y install clang llvm git make ninja-build cmake wget

RUN git clone https://git.code.sf.net/p/mingw-w64/mingw-w64
RUN cd mingw-w64 && git checkout v14.0.0
RUN wget https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-22.1.3.tar.gz
RUN tar xzf llvmorg-22.1.3.tar.gz

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#!/usr/bin/env python3

from collections import namedtuple
import socket
import struct

usbip_user_op_common = namedtuple('usbip_user_op_common', 'version code status')
usbip_usb_device = namedtuple('usbip_usb_device', 'path busid busnum devnum speed idVendor idProduct bcdDevice bDeviceClass bDeviceSubClass bDeviceProtocol bConfigurationValue bNumConfigurations bNumInterfaces')

usbip_header_basic = namedtuple('usbip_header_basic', 'command seqnum devid direction ep')

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/**
 * \file spi.c
 *
 * \brief  This is a sample application file which invokes some APIs
 *         from the SPI device abstraction layer to perform configuration,
 *         transmission and reception operations.
 *
 */

/*

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# https://deutsch.ucsd.edu/psychology/pages.php?i=201

import numpy as np
import scipy.io.wavfile
import scipy.special

f_s = 44100
duration = 10

note1 = 392

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mcpy r_end, r_sta(rt), r_dst

00000 00 00000 00000 11100000 0001111
r_dst    r_sta r_end          MISC-MEM

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def gf2_mult_intermed(a, b, m):
    result = 0
    for biti in range(m):
        if a & (1 << biti):
            result ^= (b << biti)
    return result

def gf2_reduce(c, p, m):
    # polynomial has an implicit, unspecified x^m term
    c_bits = 2*m-1

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Notes on compiling Python + Rust (PyO3) for wasm32-wasip1

Critical metadata

• Date written: 2024-10-30
• Python version: 3.12.7
• Rust version: 1.82.0
• PyO3 version: 0.22.5
• zlib version: 1.3.1

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JLCPCB Color Silkscreen Crypto

JLCPCB color silkscreen files are encrypted using AES-128-GCM and RSA-2048 with OAEP padding with SHA-256 as the hash function. Unfortunately, this means that, although it is possible for tools other than EasyEDA to create files, only JLCPCB can decrypt the resulting files.

File structure

The structure of an encrypted file is as follows:

1. 256 bytes RSA-encrypted AES key
2. 256 bytes RSA-encrypted GCM nonce

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WCH QingKe RISC-V XW extension opcode encoding

This has been reverse engineered from the toolchain only and has not been tested on hardware.

The c.lbu, c.lhu, c.sb, and c.sh opcodes replace some standard opcodes (that the QingKe cores do not implement, as the replaced opcodes require the D extension), and they also appear to be compatible with "Huawei" extensions mentioned here.

The c.lbusp, c.lhusp, c.sbsp, and c.shsp opcodes exist in a "reserved" opcode block.

001 uimm[0] uimm[4:3] rs1` uimm[2:1] rd`  00			c.lbu		(replacing c.fld)

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#include <stdint.h>
#include <string.h>

#include "CH579SFR.h"

void write_str(const char *s) {
	for (uint32_t i = 0; i < strlen(s); i++) {
		while (!(R8_UART1_LSR & RB_LSR_TX_FIFO_EMP)) {}
		R8_UART1_THR = s[i];
	}