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Best practices in synchronizing IP-based packet broadcasting networks
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- SMPTE 2059 generates timing signals aligned to the SMPTE epoch and transports them over IP using PTP, enabling aligned audio, video, and metadata streams over asynchronous IP networks.
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Paging in LTE
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Ericsson interview
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1. Jitter is the variation in the delay of received packets caused by network congestion, queuing, or errors, rather than packets being transmitted at an even pace. This can cause gaps in audio if packets are missing.
2. Delay and latency refer to the time it takes a bit to be transmitted from source to destination. Jitter is a type of delay that varies over time.
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Free Space Optics
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1. Party A's IMS network sends an SIP INVITE message to Party B's IMS network with an SDP offer to initiate the call.
2. Resources are reserved on the LTE networks for both parties. SDP negotiations take place to agree on a codec.
3. Once resources are reserved and preconditions met, Party B's phone will ring. When answered, Party B sends a SIP 200 OK message to complete the call setup.
4. The media path is then established between the two parties
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- 2. 목차 ● OpenCR ? ● 개발사양 ● 아두이노 포팅 ○ 부트로더 ○ 다운로더 ○ 아두이노 보드 소스 ○ 온라인 배포 2
- 3. OpenCR (Open-source Control Module for ROS) ● STM32F746ZGT6 216Mhz, 1MB Flash, 320KB SRAM ● 아두이노 우노 핀 헤더 ● 아두이노 IDE 개발환경 지원 ● 다이나믹셀/올로/UART/CAN 인터페이스 ● 배터리 입력 및 전원 출력(12V/5V/3.3V) 3
- 4. 개발사양 ● 아두이노 IDE 지원을 위한 기본 사양 구 분 내 용 비 고 지원 OS - Windows - Linux - Mac 컴파일러 - Windows/Linux/Mac : gcc arm 5.4 2016q2 Cortex M7 지원이 되는 GCC Arduino IDE - 1.6.9 이상 https://www.arduino.cc/ 배포방식 - 보드매니저를 통한 온라인 배포 arduino.org의 IDE는 보드매니저 지원안함 4
- 5. 아두이노 핀 헤더 ● 아두이노 우노 핀맵과 호환 ● I/O 전압은 3.3V 5
- 6. 아두이노 upload 과정 아두이노 IDE OpenCR 보드 컴파일러 (2) 다운로더 (3) 부트로더 (4) 보드 소스 (1) 포팅시 필요 항목 운영체제에 따라 별도 구성 6 윈도우 리눅스 맥
- 7. 개발 과정 보드 기본 테스트 구현 - 개발 환경 구축 - CubeMX 사용 방법 Study 부트로더 구현 다운로더 구현 - 메모리 맵 구성 - 다운로드 프로토콜 구현 - 플래시 메모리 제어 아두이노 보드 소스 구현 - 아두이노 API 클래스 포팅 - 핀맵 구성 온라인 배포 구현 - github를 통한 온란인 배포 7
- 8. 부트로더 ● 메모리 맵 ● 다운로드 순서 8
- 9. 다운로더 ● stm32ld ○ stm32의 내장 부트로더와 시리얼 통신으로 펌웨어 다운로드 할 수 있는 오픈소스 ○ 윈도우/리눅스/맥에서 모두 빌드 가능 ○ https://github.com/jsnyder/stm32ld ● opencr_ld ○ stm32ld의 통신 모듈을 기반으로 opencr의 부트로더 프로토콜을 구현함 ○ 윈도우/리눅스/맥에서 모두 빌드 ■ 윈도우는 QT를 개발환경으로 사용함 9
- 10. 아두이노 보드 소스 ● 폴더 구조 구 분 내 용 bootloaders 보드의 부트로더 이미지 파일 폴더 cores 아두이노 API 클래스 폴더 libraries 보드에서 지원하는 기본 라이브러리 폴더 variants cores를 공유하는 보드 관련 파일 폴더 boards.txt 보드별 설정 platform.txt 빌드를 위한 컴파일 설정, 다운로드 툴 설정등 programmers.txt 부트로더 업로드 설정 10 ● 아두이노 IDE 1.5.3 버전 이상부터는 호환 보드를 쉽게 추가하도록 변경됨 ○ https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5-3rd-party-Hardware-specificatio n
- 11. 아두이노 보드 소스 ● 보드 소스 테스트 방법 ○ 보드 소스를 hardware 폴더 아래 새로운 폴더로 추가하면 아두이노 IDE에서 보드가 추가됨 11
- 12. 아두이노 포팅 ● HALMX 프로젝트 ○ http://www.stm32duino.com/ 에서 STM32CubeMX를 기반으로 아두이노 보드를 포팅 ○ https://github.com/rogerclarkmelbourne/Arduino_STM32 ○ 현재까지 F1/F3/F4를 지원함 ● 변경 내용 ○ HALMX 프로젝트는 F7 시리즈는 지원하지 않기에 기본 cores와 variants의 뼈대를 사용하고 STM32CubeF7 라이브러리를 추가하여 포팅함 12
- 13. 소스 Layer 구조 아두이노 API Class (cores) STM32CubeF7 OpenCR (variants) bsp hal driver Hardware 13
- 14. 온라인 배포 ● github에 json파일과 배포를 위한 압축파일 업로드 ○ 아두이노 IDE 1.6.4 이상 부터 보드 매니저를 통해 온라인으로 배포 가능해짐 ○ https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.6.x-package_index.json-format-sp ecification ● OpenCR json 파일 ○ https://github.com/ROBOTIS-GIT/OpenCR/blob/master/arduino/opencr_release/package_ opencr_index.json 14
- 15. json 파일 ● platforms 15 아두이노 보드 소스 gcc 컴파일러 다운로더
- 16. json 파일 ● opencr_gcc 16 ● opencr_tools
- 17. github 업로드 ● 온라인상에에서 다운로드 가능한 gcc 컴파일러는 다운로드 링크를 사용함 ● 플랫폼파일과 tools파일은 압축해서 github의 release로 업로드함 17
- 18. 보드 매니저 ● 아두이노 IDE의 설정에서 보드매니저 URL에 json 링크를 추가하고 설치함 18
- 19. 보드매니저 19
- 20. 아두이노 보드 폴더 구조 20
- 21. 예제 ● TFT LCD ○ https://youtu.be/y4if5J_upyY 21
- 22. 결론 ● 아두이노 빌드 과정과 구조만 알면 쉽게 보드를 아두이노 호환 보드로 만들 수 있음 ● OpenCR보드를 성능 좋은 아두이노 보드로 사용 가능함으로 아두이노 IDE를 통해 쉽게 개발 환경을 구축 가능함 ● 아두이노 보드 포팅을 위해서는 다양한 OS에 대한 고려 필요 ● github를 통해 온라인 배포 가능 ● ARM용 아두이노 보드에 대한 쉴드 라이브러리는 일부 수정이 필요함 22
- 23. 참고 자료 ● OpenCR 소스코드 ○ 부트로더 ■ https://github.com/ROBOTIS-GIT/OpenCR/tree/master/arduino/opencr_bootloader ○ 다운로더 ■ https://github.com/ROBOTIS-GIT/OpenCR/tree/master/arduino/opencr_ld ○ 아두이노 보드 소스 ■ https://github.com/ROBOTIS-GIT/OpenCR/tree/master/arduino/opencr_arduino/opencr ○ 온라인 배포 파일 ■ https://github.com/ROBOTIS-GIT/OpenCR/tree/master/arduino/opencr_release ● 아두이노 ○ https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5-3rd-party-Hardware-specification ○ https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.6.x-package_index.json-format-specification 23
- 24. Q & A 24
- 25. 감사합니다. 25