Recent Updates
String Comparison Micro-optimization on X86, ARM and Xtensa
This article discusses the difference in GCC generated machine code between comparing a string character by character, as a whole multi-byte data unit, and using memcmp() function on X86, ARM and Xtensa for both aligned and misaligned strings. It analyzes the machine code generated by GCC, shows the code size, operation count and memory usage in different senorials.
C language, Assembly language, GCC, Optimization, X86, ARM, Xtensa, memcmp, stack
ESP-32 TCP Baremetal HTTP server
This article demonstrates how to use the low-level TCP/IP socket to build a HTTP server for static or fixed-length response and minimum HTTP response header on ESP-32 in ESP-IDF, without using the HTTP library. It also discusses how lwIP works for TCP/IP network socket send, shutdown and close.
ESP-32, ESP-IDF, TCP/IP, HTTP Server, lwIP, network socket, send, shutdown, close
RP2040 UART in Baremetal
In this article, we will discuss how to use the UART on RP2040 in a bare metal application.
Paspberry Pi Pico, RP2040, ARM, Cortex M0+, Baremetal, UART, Serial communication, MCU
Compare RP2040 Executable Memory Regions and Load Program From Flash into SRAM
Compare RP2040 executable memory regions (flash XIP space, striped SRAM and banked SRAM). Discuss memory strategies, data hazard and structural hazard. Load program from flash into SRAM then execute from SRAM.
Paspberry Pi Pico, RP2040, ARM, Cortex M0+, Assembly, Baremetal, Memory, Memory structural hazard, Linker script, Virtual memory address, Load memory address, MCU
Switch RP2040 Clock Source in Baremetal: ROSC, XOSC and PLL
Compare the RP2040 clock sources, switch the clock source in bare metal.
Paspberry Pi Pico, RP2040, ARM, Cortex M0+, Assembly, Baremetal, Clock source, Clock tree, ROSC, Ring oscillator, XOSC, crystal oscillator, PLL, Phase locked loop, MCU
RP2040 Baremetal Dual-core Application and Core 1 Launch Protocol
Analysis the RP2040 Core 1 launch protocol. Launch core 1 in bare metal multi-processor application with minimum code.
Paspberry Pi Pico, RP2040, ARM, Cortex M0+, Assembly, Baremetal, Bootloader, MCU, Dualcore, Multi-processor
Keywords
Assembly (8), ARM (7), MCU (7), Paspberry Pi Pico (6), RP2040 (6), Baremetal (6), AVR (6), Cortex M0+ (5), C language (3), Bootloader (3), Embedded system (3), Assembly language (2), GCC (2), UART (2), Linker script (2), Flash (2), XIP (2), AVR-GCC (2), disassembly (2), compiler (2), ABI (2), ISA (2), Application Binary Interface (2), Instruction Set Architecture (2), object file (2), embedded (2), Stack (2), PDF (2), Web app (2), ATtiny (2), PCB (2), Optimization (1), X86 (1), Xtensa (1), memcmp (1), stack (1), ESP-32 (1), ESP-IDF (1), TCP/IP (1), HTTP Server (1), lwIP (1), network socket (1), send (1), shutdown (1), close (1), Serial communication (1), Memory (1), Memory structural hazard (1), Virtual memory address (1), Load memory address (1), Clock source (1), Clock tree (1), ROSC (1), Ring oscillator (1), XOSC (1), crystal oscillator (1), PLL (1), Phase locked loop (1), Dualcore (1), Multi-processor (1), W25Q (1), SSI (1), SDK (1), uf2 (1), Bearweb (1), PHP (1), Memory usage (1), Memory optimization (1), File size (1), OOM (1), Out of memory (1), Output buffer (1), RAM (1), stream (1), Web dev (1), Multilingual (1), Accept-Language (1), Navigator.language (1), Alternative language (1), SEO (1), HTML (1), lang (1), hreflang (1), Custome HTML Element (1), HTML dataset (1), AVR-AS (1), AVR-LD (1), linker (1), Bare metal (1), Memory layout (1), Static variable (1), local variable (1), optimization (1), Tiling (1), Enlarge (1), Divide large file (1), WS2812 (1), LED (1), LED stripe (1), Segment design (1), Parallel signal (1), CH340 (1), CH340E (1), USB (1), Interface IC (1), ATtiny25 (1), ATtiny24 (1), ATtiny441 (1), ATtiny261 (1), ATtiny2313 (1), ATtiny48 (1), Function frame (1), SP (1), Stack pointer (1), FP (1), Frame pointer (1), Engineering drawing (1), titleblock (1), 68hc11 (1), 6800 (1), microprocessor (1), ASCII (1), string (1), memory structure (1), printf (1), C (1), ISR (1), interrupt service routine (1), ISR_NAKED (1), avr-asm (1), CNC (1), KiCad (1), FlatCAM (1), PCB prototyping (1), Gerber (1), Level shifter (1), voltage (1), NMOS (1), diode (1), 2N7002 (1), LL4148 (1), circuit design (1), PCB layout (1), MODBUS (1), MODBUS RTU (1), PLC (1), serial (1), industry control (1), CRC (1), MSC-51 (1), 89C52 (1), Micro controller (1), Nixie tube (1), Clock (1),