2024-11-05(6): Project, Sysprog Recap

Org

• Clarify licensing status

  • used training material (faschingbauer.me) is GPL3

  • also on faschingbauer.me: project management, design docs, thereby that material is also under GPL3

  • No specific license: https://github.com/jfasch/FH-STECE2022 (this year’s EC2 project) and https://github.com/jfasch/FH-ENDLESS (my contributions to it)

    Which license to pick? -> https://choosealicense.com/

• Define hardware (task group) owner

Material

• Recap class point. Emphasize on const, and initialization

• signed vs. unsigned: SysFSPWMPin has a mixture of uint64_t and int64_t. Should take care, mostly about semantics: period and duty_cycle cannot become negative, so these should possibly be unsigned. But how about conversion to SysFSFile’s methods, which currently only take int64_t. Solution: check for overflow/conversion, or add uint64_t methods to SysFSFile.

Project

• Homework Until 2024-11-05

• Software implications: aggregating objects into instances of higher level types

  • Show (DONE) PMW Abstraction On Top Of /sys/class/pwm/

  • (DONE) RC Servo Control, which aggregates a (DONE) PMW Abstraction On Top Of /sys/class/pwm/

  • (DONE) Motor Control: BTN9960LV, which aggregates one or two (DONE) PMW Abstraction On Top Of /sys/class/pwm/

• (DONE) Motor Control: BTN9960LV

  • How’s it with hardware? Do we need 2 PWMs, or just one?

    • Ask for permission of car layout docs -> put it in repo

  • How’s it with software? Write test together.

• (DONE) RC Servo Control

  • How’s it with software? Write test together.

• (CLOSED) Proximity Sensor: VL53L1X: talk about usage sketch of class VL53L1X

• (ACTIVE) Gyroscope (BNO055): talk about usage sketch of class BNO055

Homework

• ip addr

• Someone to implement signed/unsigned? ⟶ std::stoull()

Myself

• create git page, and link it to course main page

• ./fh-stece22-suite: /usr/lib/arm-linux-gnueabihf/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by ./fh-stece22-suite)

• uint64/int64 woes (pwm vs. sysfsfile) -> see existing commented-out test