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Type: Posts; User: dr hydra

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    Re: Can the propeller run on 3.0 volts

    I know it is overkill…but it is cheap insurance…For communications from the propeller to the stm32…I am going to run a 74lvs244 between the propeller tx (running at 3.3V) and the stm32 rx (running at...
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    Re: Can the propeller run on 3.0 volts

    This has been very helpful...an external pull down is simple...I will go with that...however how would you hold the propeller in reset...I am not sure how that works...
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    Re: Can the propeller run on 3.0 volts

    Thank you...thank you...

    This has been a big help...it looks like most pins are set floating input...which would make the ft pins 5v tolerant. Perfect...

    I am thinking the safest setup for me...
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    Re: Can the propeller run on 3.0 volts

    Thank you for the help

    I cannot find the default settings for the gpio pins...any ideas...once I found out the default setting...I need to make sure the gpio is set to input with no pull or pull...
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    Re: Can the propeller run on 3.0 volts

    Another thought...could or should I run a diode on the propeller pins (output) to the stm32 (inputs)...the voltage drop would be around .2 to .3 volts? Then the propeller output voltage (3.3v) in...
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    Re: Can the propeller run on 3.0 volts

    Thanks for the answers...I have one more concern...with the stm32 vdd running at around 3.0v and the propeller's 3.3v will the gpio pins on the stm32 be damaged by the propeller...if I am reading the...
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    Can the propeller run on 3.0 volts

    I know the data sheet shows a min of 2.6volts...but what happens if the voltage is 2.8 to 3.0...does the propeller run or does it keep resetting? Does it cause any damage?
  8. Re: What is the max power draw on the propeller

    Thank you for the help...

    It looks like my best bet is to use the 5v power supply on the discovery board and add a LM2937ET 3.3 LDO to power the propeller...thanks again for the help
  9. Re: What is the max power draw on the propeller

    Peter...sorry for the confusion...I am looking to use a propeller has a "gpu" device with the stm32f4 discovery as the CPU/ brain. The propeller would be powered by the stm32 discovery...
  10. Re: What is the max power draw on the propeller

    This power draw is driving me nuts...I was also looking at adding a propeller to the stm32F discovery board...however, it looks like the max output on the 3.3v is 100mA...Can I add the propeller to...
  11. Re: What is the max power draw on the propeller

    I am looking at using the PIC microstick and propeller together...Powering the propeller from the microstick's power supply. The microstick has a limit of 500mA. Also, the 23lc256 would need to be...
  12. What is the max power draw on the propeller

    Is the max power draw on the propeller under 500mA?
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    IR signal question

    I am looking at the IR kit from the object exchange. I am trying to understand how to use the propeller to send IR signals. The signal is modulated at 38K…however, looking at the IR_tx_nec spin...
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    refresh my memory

    On the propeller project boards ver 1.0 and 2.0...what was the problem with the VGA display and how do you fix it..
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    Re: looking for a logic chip

    Thank you for the help...I was hoping for a nice simple logic chip:)...CPLD looks like the best option...however...I would need it in a DIP...
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    looking for a logic chip

    Is there a simple logic chip available that takes input from one pin...over two clocks/two inputs...and outputs the data on two seperate pins...an example 8 bit data could be convert to 16 bit data...
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    Re: sync cogs using the cnt register

    Thanks for the reply....I am using pasm...I am looking for a very deterministic timing

    thinking though this...I have a few concerns/questions...Once the cogs are in-sync...any read to the hub will...
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    sync cogs using the cnt register

    Is there a simple application note or write up for syncing all cogs through the cnt register?
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    Is 18-bit VGA display possible

    Just a proof of concept…has anyone tried to use three separate cogs to drive 18-bit color VGA. Since the propeller is basically setup to drive 6-bit VGA…is it possible to use three cogs…one for...
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    Propeller Project Board USB

    Is the Propeller Project Board USB coming back soon...I have been waiting over two months to order one...it is the best platform for using VGA:)
  21. Sticky: Re: Open Propeller Project #6: Open Source Verilog for Propeller 1

    open source p1 core...very cool

    Hardware design (Verilog) is above my knowledge...however, someone needs to make a BEMicro CV (nice price) P1, with more speed, more COGS, more hub memory, 16 to 32...
  22. Re: Ruminations while awaiting an FPGA image (was "Hello...... Anyone out there?")

    My guess...the p2 will live only as a FPGA image...and parallax will produce fpga boards that include the image...but then again it is just a guess:)
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    Re: 4X4 Key Pad problem

    Thank you both Duane and Ron...exactly what I needed
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    Re: 4X4 Key Pad problem

    I was just looking at the 4x4 keypad object...I am planning on having leads over a foot long...so I need to add resistors, however, I am not sure how the schematic that RobotWorkshop describes works...
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    Re: Using propeller standard SPI interface

    what about in slave mode....how fast the propeller receive data....plus get that data from a cog to the hub memory...ex...receive 4000 bytes
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