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#include <Arduino.h>
#include <SoftwareSerial.h>

SoftwareSerial soft_serial(10, 11);

void setup() {
  soft_serial.begin(9600);
  Serial.begin(9600);
  while (!Serial) {
  }

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## mp3 to pcm
ffmpeg -y -i xxx.mp3 -acodec pcm_s16le -f s16le -ac 1 -ar 16000 output.pcm

## play pcm 
ffplay -f s16le -ar 16k -ac 1 output.pcm

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/** << CSAPP >> Cap.5.1 */

// 当要对入参指针进行操作时,还需要考虑入参指针相同的特殊情况:
void twiddle(long *xp, long *yp)
{
  *xp += *yp;
  *xp += *yp;
}

void twiddle2(long *xp, long *yp)

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Get all gists from the user santisbon.
user:santisbon

Find all gists with a .yml extension.
extension:yml

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language:html

Changes729

x86-64 (also known as just x64 and/or AMD64) is the 64-bit version of the x86/IA32 instruction set. Below is our overview of its features that are relevant to CS107. There is more extensive coverage on these topics in Chapter 3 of the B&O textbook. See also our x86-64 sheet for a compact one-page reference.

Registers
The table below lists the commonly used registers (sixteen general-purpose plus two special). Each register is 64 bits wide; the lower 32-, 16- and 8-bit portions are selectable by a pseudo-register name. Some registers are designated for a certain purpose, such as %rsp being used as the stack pointer or %rax for the return value from a function. Other registers are all-purpose, but have a conventional use depending on whether caller-saved or callee-saved. If the function binky calls winky, we refer to binky as the caller and winky as the callee. For example, the registers used for the first 6 arguments and return value are all caller-saved. The callee can freely use those registers, overwriting

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/**
 * @see http://www.cse.yorku.ca/~oz/hash.html.
 * @see https://api.riot-os.org/group__sys__hashes__djb2.html.
 */

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# https://linuxhint.com/check_memory_usage_process_linux/

# https://stackoverflow.com/questions/18845857/what-does-anon-rss-and-total-vm-mean

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-mfloat-abi=hard #soft, softfp, hard

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<div
  style="
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    width: 100%;
    margin: auto;
    text-align: center;
  "

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valgrind --leak-check=full $exe $ARGS