Past projects include customised controllers, bi …1 day ago attach the next one.Scott drive Scott Drive Limited provides custom design services to OEM’s in the hybrid/electric vehicle and renewable energy sectors. This won't happen with the propeller! EEPROM gone? Well. I already damaged AVRs just by programming to often, which I think is very usual when developing programs. It's booting from external EEPROM -or FRAM- into it's internal RAM. The propeller does not have any internal non-volatile memory to store programs on, like FLASH or internal EEPROM. another difference to other microcontrollers. 32kByte serial EEPROM to store one program.Īh. (full speed means the speed given in the spec as max. Of course some Objects will not run at that low speed.Ī 5 MHz crystal to get the full 80MHz internal speed generated with PLL. In their documents you can also find a serial interface which only needs some resistors & transistor.įor a start with the propeller you only need: I'm still running my propeller on a breadboard with a non Parallax USB to serial converter. You will need to purchase a programmer, such as the PROP PLUG, for a modest price. The software is a FREE download on Parallax's web site. Interrupt driven controller software most times needs to be adapted to fit in the own environment. Mainly because the Objects can be used without changes in most cases. I did PIC programming and AVR programming before, but the propeller is so easy to use and you get results much faster than with other controllers. pick an object that implements 4 serial prots per COG, use it in 2 COGs and there you are. So, if you need a chip with 8 serial ports. And Parallax supports the developers by offering a internet platform for Object Exchange. SPIN supports modular software development by so called Objects. Instead of adding hardware here and there and offering thousands of different types of microcontrollers for every possibly useful combination, the propeller is designed to do all that in software or get support by external chips that do things much better than the internal circuits. On the first glance this does not sound very good!īut that's exactly what the 8 COGs are meant for. Only a video generator per COG and 2 counters per COG (COG is the name of a core). No I2C, no serial interface, no AD and so on. The Propeller is a "grown ups" processor with plenty of oomph in the right places, it's just that Parallax provides a lot of hand holding for the beginner to help them get started.īig difference to other MCUs is that the propeller has very little hardware add-ons. I did not mean that to sound like Parallax products are only suitable for the beginner. Parallax really concentrates on the beginner market, so along with being a pretty potent little machine, it is very easy for a greenhorn to get working in short order. The ability to do crash and burn compile/test cycles in a matter of seconds (it takes about 7 seconds to download the absolute largest program into the chip and huge compiles rarely take more than 2 seconds - more often in the hundreds of milliseconds) makes for a very fast turnaround development cycle. I keep a stack of proto-boards handy for rapid prototypes. As long as you remember it is a microcontroller and play within its limits, it's an incredibly nice chip to use. Having 8 identical cores with a completely deterministic instruction cycle makes for a very versatile little chip. Spin is not blazingly fast, but raw PASM is pretty sprightly (50ns instruction cycle). Spin is a nice easy language to get your head around and as an interpreted language, quite efficient with a nice compact bytecode.
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