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Rezensionen (2)
21. Okt 2015
Arduino/AVR with lots of I/O
The board utilizes an AVR with one of the most expansive interfacing and I/O options. Regarding this board, I find it very useful because the ATMEGA2560 chip is not available in an easily prototyped package (no DIP) and is one of the few AVR MEGA chips with 3+ serial/UART ports (one of the ports is used for the bootloader). Regarding the Arduino "ecosystem" in general, the Arduino system utilizes the AVR bootloader concept for easy programming. The AVR-GCC toolchain provides solid C and C++ toolchain support. There are MANY libraries that help one to utilize hardware connected via the hardware interfaces (i2c, SPI, UART, GPIO, etc.). Lastly, one can still implement code in AVR assembly (which, btw is clean and minimal) by adhering to the GCC interface requirements - this mostly entails proper register usage for parameters into assembly functions and out as return values and proper stack usage (pushing and popping certain registers if used for temp storage within the assembly language function). One can utilize the Arduino system (and this board) without any assembly language code and implement determinant system using all the latest hardware. I have found few instances where AVR assembly code is needed and I find myself MUCH more productive using the AVR-GCC toolchain (with and without Arduino). If a new sensor becomes available, it is inevitable that someone will write a library to allow one to use the sensor at a relatively high level - with source code to reveal at least one way of utilizing the sensor. Also, I have found the available documentation and code on sensor libraries to be well done, thoroughly vetted and amended by the Arduino community. Lastly, in addition to the bootloader concept, the Arduino system is based on a very well done IDE interface for programming and adding functionality - including board types and sensor libraries. I also use AVR Studio, and use it exclusively when deploying production or productized AVR based solutions; I use Arduino very often when evaluating new sensors. One benefit to using AVR Studio is that the code is very lightweight and it has a great GUI simulator, which is allows stepping around C code and AVR assembly code. In circuit emulation and JTAG debugging is also available. However, the sensor library support is not as well developed in the AVR Studio environment, it exists and is helpful, but it is more cumbersome and doesn't keep up like the Arduino system/ecosystem.
22. Okt 2015
Full function, modern sequencer with a low price tag
Although dated by the MC-80, this unit holds its own. All normal sequencing features are present, and they are accomplished quickly. Its major drawback is using 3.5" floppy disks - but they are still available, so it isn't a big deal. However, if the unit is essentially useless once the disk drive fails (although there are solid state alternatives, but at a cost.) The unit can sync with a MTR using midi sync or FSK-II (I use the midi sync.) I like this solution, versus a computer, because the timing is tight - multi track recording on this device is real time. If you record your instruments live, this is a great device for you. However, if you like piano-roll editing, it could be difficult.