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  • Prop II question : Serial Chip-To-Chip Communication

    The new Prop II spec
    Attachment 90354
    says
    ["Chip-To-Chip Communication
    Each cog now also features high-speed serial transfer and receive hardware for chip-to-chip communication. The hardware requires three I/O pins (SO, SI, CLK). Opcodes are SNDSER RCVSER SETSER "]

    but this seems to exclude both Standard SPI and QuadSPI support ?

    That’s a large blind spot – standard SPI receives as it sends, and QuadSPI is the emerging standard for large FLASH memory.
    So near, and yet so far…

    SPI does not appear anywhere in the DOCs … Do parallax imagine Prop IIs will ONLY talk to other Prop IIs ?

  • Hello I am working on a project from work where I will receive a decimal number via a serial port and would like to have a prop receive that signal and set a pin high or low depending on decimal received. This question is in regards to wiring for rs-232, First of all can i wire up the rs-232 connection using any arbitrary pins that are available or does it in fact have to be the p31 32 comms pins for the prop ? I am aware of needing a rs232 to ttl converter chip and i have one of those... ...
    So, the issue is simple: When I plug a TV into an RCA jack I soldered onto my proto-board the Prop Chip resets. I think this is due to the ground planes being different. I don't really know a good solution to think problem. Not all TV's I plug the prop chip into cause the prop chip to reset. Any suggestions? More capacitors near the prop chip? I have 1 uF ceramics on the 4 power lines and 0.1 uF on 2 of the 4 power lines. Should I put some 10 uF caps near by? Thanks,
    I have just received the Emic 2 bd and have it connected to a prop chip P6 P7. The Emic 2 Demo loads and plays fine. I have the Parallax Serial Term. software loaded in my bench computer. com 3, 9600 baud. I loaded the serial software in the prop but I cannot get the prop/Emic 2 to talk to the terminal program. I never get the ":". All suggestions are welcome. I am a "new commer" to the Prop. chip/Emic 2/parallax Terminal software so it is most likely something I am missing!
    Ok so I finally got all my stuff in the mail, I built a simple power regulator circut on some pref board then followed the simple propeller schematics on in the prop manual, have not added a crystal yet though. When I hit f7 spin tool says no propeller chip found on com 3, but when i use the serial terminal and type RX, and TX both light up, when i hit my reset switch RX, flashes, when I hold the reset button as I type only TX will flash and RX stays dead until I let go of the reset. ...
    My point of view is using the prop as a micro-controller in embedded systems without any video and as fast as possible. I would use the SPIN language, PASM, with LMM. 1) Main memory 64k bytes. No more to conserve chip area and not less as this would be good enough. 2) Increase the speed of the SPIN interpreter if possible. 3) Include a Parallax standard LMM model that can be used when writing PASM. Tools support. 4) A boot image that would load the LMM into cog 0 at startup. 5) Make the outputs and enables of the Cog counters connect to pins under ...
    Is the Quickstart the cheapest Prop board being sold? I think it's $25 from Parallax, more through other vendors. The new FTDI FT231 chip has me thinking about how cheap a Prop board could be... I also noticed yesterday that Digikey has Props for $5 in qty. 100. Haven't gone through the numbers extensively, but it seems that very basic Prop board could be made for ~$10 in parts... $5 Prop $2 FT231X $1 USB connector $1 EEPROM $1 Crystal + passives Add in a dollar or two for the PCB and maybe you have something that can be sold for $15?
    The Q44 Prop on by board has Ground going to all 4 VSS pins and the Brown Out Enable, 3.3v going to all 4 VDD pins, P28 amp P29 going to EEPROM, P30 amp P31 amp RESn amp Ground going to a propellor USB adapter, and nothing is touching the XO or XI pins. I'm getting 3.3v coming out of my unused prop pins, but when I connect my prop to the propellor tool via the mini-USB adapter it comes back saying it cannot locate a propellor on any port(Port 4). When I move the USB cord over to my ...
    I am considering making a microSD add-on board with a difference... - ~0.8"x0.7" (~20x17.5mm) pcb smt - microSD socket - Propeller chip - Xtal (non-socketed?) I think 6MHz because they are cheapest - 24LC64 (8KB) eeprom with SD boot code - 1/2/3/4 wire connection to your propeller board (various protocols) - requires 3V3 and GND (i.e. no regulator on the pcb) Purpose... To provide fast and buffered connection to the microSD card. The included prop can read ahead and write behind, compare before writing to save wearing out a card if write is not required. Interface... 1pin for simple and therefore slow interface ...
    I did a search on digital POT's for the propeller chip but only found a driver for a MCP4141 which is acting a little weird( see note 1). Also there is mention of pull up resistor on the CS pin and I don't see it being used with any other micro, with that chip. Is it required for SPI? I do remember pull-ups being used on some SPI sd cards. I have to control a set of LED lights with 0 to 5VDC and I'll keep experimenting with the MCP4141 for now but would like other options in case I ...
    Just wanted to say thank you to everyone on the board that helped me setup the prop chip as simple fm transmitter. After many attempts at various things to try and fix it, it turned out the actual prop chip was broken even though it would let me program it. I got a new one and it works like a charm! So thank you all I've learnt so much from u guys already.
    Here's my top-secret big idea (I'm such a blabber mouth): I'll combine a SQI flash chip with 4 SPI SRAM chips. The SRAMs will have SI and SO connected together (I may use a series resistor on SO for failsafe) and all four sharing the same clock and chip select. Will it work? Don't know... I hope to find out by Friday... But, maybe you can convince me this won't work and save me time and money? In this nibble configuration, the board will use 8 pins. That will let it still work on the Prop Demo board. In byte mode, it will need 12 pins. This is ...
    Ok, I have a gadget gangster pp usb setup, that worked from day 1 (which was about 6 months ago). Then I decided to take a break from electronics for about a month. I come back, and the prop ide and the propgcc simpleide won't recognize the chip. The port is active, I am using the FTDI driver acquired from the "Downloads" section of the parallax website. I have also tried other versions from the FTDI website. I have disconnected my bluetooth keyboard and mouse, and used wired, I disconnected my MIDI controller, I checked the voltage right off the ...
    Anyone here achieved serial communication between their Prop and MATLAB? I'm attempting to use FullDuplexSerialPlus along with the MATLAB commands specified in the help docs. I'm struggling to get the devices to even connect on the COM port. Thanks for any help.
    I have a little project where I want the UNO board to send commands to a Prop shield. The Prop shield will actually be my main board/controller for my robot. I only what the UNO to send commands to the Prop(some kind of string of data). Basically I can write a simple C program and the Prop does all the work. I'm thinking SPI object or some other serial object is the way to get these to to talk. I really haven't seen anything like this before. I think this is the way to go? If anyone knows of some projects that are similar if ...
    Sorry another newbie question, if you plugged the transmit pin on the prop chip running fm transmitter program into a crystal oscillator say at 1ghz and then to an antenna would it broadcast the signal at 1ghz?
    The webinar finished 30 mins ago, with Chip's presentation the last. I understand the webinar will be posted but it is after 10pm at Parallax. Here is what I recall... It has been quite a learning curve with the layout. There are about 40,000 flip-flops in the Prop II. There were about 160*8=1280 in Prop I. After the original chip layout simulation the critical path was showing only about 80MHz clocking. Chip has now refined the critical paths and it now looks like 180MHz. There will be ~126KB Hub SRAM and ~2KB Hub ROM. 128 pins in QFP 14mm? 92 General purpose I/O 8 Cogs 64bit CNT ...
    This gets raised often, so here goes again... (this is my take on what happened) Chip realised that switching programs under windoze caused the comms status pins (DTR amp RTS) to be reset when the COM port was released by a program. The next program would presumably then make these signals active. Under normal circumstances, using the DTR or RTS pin (at TTL level) would cause the prop to reset. When downloading a program to the prop it is normally held in SRAM and we do not bother to program the eeprom (it has a large but limited number of program cycles). ...
    I've been watching the original 'Prop BOE being fabbed ' thread on the General Discussion forum but not much has been added in days. As the title asks, is this the proper forum to watch for Prop BOE threads? I suppose everyone who got their Prop BOE is busy working with theirs. So not much showing up yet. If this is the proper place to watch. Thanks for all replies.
    Will the Propeller fail to be detected if the eeprom is bad/missing? I just wired up a board to use the Propeller chip that I got in the "Mystery Bag". I had checked all the voltages and checked for shorts and everything looked good. I then plugged in the Prop and the eeprom but somehow when doing that one of the LM317 resistors broke and both chips saw 6+ volts. I fixed the problem and replaced the Propeller but I don't have another eeprom. The Propeller Tool still doesn't detect a Prop. I just need to know if the eeprom ...