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  • mlewus's Avatar
    04-21-2021, 12:15 PM
    This topic was discussed in some depth earlier in this thread. The only practical ways do this is for the board to have no components on the bottom, or require a cutout on the baseboard. Single side components has been...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-18-2021, 07:16 AM
    Analog Devices, TI, Maxim, Microchip and others make multi-channel ADCs that can be easily managed over SPI or I2S. These are available in 2-8 channel versions at 1+ msps per converter. A search on Mouser, Digikey, or...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-17-2021, 11:15 PM
    Pico uses the PIO to do I2S. The code could be identical between python & C but does not have to be.
    205 replies | 15732 view(s)
  • mlewus's Avatar
    04-17-2021, 09:41 PM
    @kdharbert, what voltage range, speed, and resolution do you need?
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-17-2021, 07:20 PM
    Like the RT1062, the Rt1176 has 2 ADCs. They are 4.2 Msps @ 12bits. It does also have 5 SAI (Serial Audio: I2S, TDM, etc) channels so you could add external high quality ADC/DAC hardware, like what Paul did with the...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-14-2021, 02:33 PM
    it's probably possible, that is, there is sufficient computing power available. But how much Library development are you willing to do, to avoid using the Teensy 4? Why not just use a Teensy? The libraries are...
    205 replies | 15732 view(s)
  • mlewus's Avatar
    04-13-2021, 12:33 AM
    The Vdrop is intentional. The USB line goes to a 5 volt to 3.3 volt converter so the voltage drop on the 5v side is irrelevant. They could have just as easily used a p-mosfet as an "ideal diode" but there was no reason...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-10-2021, 11:17 PM
    Have you tried to use custom code with the other PIO to generate C64 sound? I don't know a lot about the c64 but it sounds like something that you could do without generating a lot of interrupts.
    205 replies | 15732 view(s)
  • mlewus's Avatar
    04-09-2021, 11:48 PM
    It's more than just routing the pins. The bootloader, a mcu in its own right, uses JTAG to communicate with the RT1062 MCU. There are also business considerations. Paul has previously said he is considering JTAG but has...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-09-2021, 04:21 PM
    This sounds great. I used a software-based debugger for ATMega. A limitation was that interrupts needed to be running all the time in order for the debugger to work. Is it possible to set a breakpoint inside an ISR if...
    85 replies | 9252 view(s)
  • mlewus's Avatar
    04-04-2021, 09:15 AM
    A I2C socket open up a range of cheap, easily attached hardware, particularly good for beginners. SparkFun owns "Quiic", while Adafruit owns "STEMMA". The two systems are similar, generally compatible, but STEMMA has...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-03-2021, 05:06 PM
    CMSIS & FreeRTOS are already part of MCUxpresso. MCUxpresso, a SDK rather than an Operating System, was ported to the RT117x MCUs & gcc last year. Regardless, I was not suggesting that Paul do it. PJRC is not a...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-02-2021, 10:15 PM
    NXP's MCUExpresso SDK already includes a port of FreeRTOS as well as much other useful stuff like FATfs, Networking etc. Should not be too difficult to fold it into Teensyduino.
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-01-2021, 10:02 PM
    I guess as long as there are people with high disposable incomes there will be other people trying to separate them from their money. NFTs are good example of this. Why is an "original" digital image worth $69,000,000...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-01-2021, 06:57 PM
    I apologize in advance for off-topic. I've been looking for an AV receiver to replace my old one. There's a whole section on Sony's product website where they sing the praises of components that have no meaningful...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-01-2021, 02:50 PM
    I read the article, very interesting. But building a microcontroller that dissipates watts is an entirely different problem then a guitar pedal that dissipates a few milliwatts. Enclosing components under the Teensy...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    04-01-2021, 01:02 AM
    The topic of castellated pins has come up a couple times before in this thread. One major challenge is the decoupling capacitors on the bottom of the PCB. These would require a cut out if one were trying to solder to a...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-27-2021, 08:20 PM
    The Arduino Nano RP2040 Connect hardware was spotted in the wild in early Feb. From Tom's Hardware: https://www.tomshardware.com/news/first-pi-silicon-arduino-nano-rp2040-connect-spotted I would hazard a guess that...
    205 replies | 15732 view(s)
  • mlewus's Avatar
    03-27-2021, 07:55 PM
    A RGB LED driven with a single I/O pin ie WS2811, WS2812, SK6812, 5050, etc. would be ideal.
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-24-2021, 05:35 PM
    The RT106x natively supports quad SPI, and the 117x supports both quad and octal SPI. These simultaneously clock multiple data lines. The optional external memory (PSRAM / FLASH) on the Teensy 4.1 is interfaced via QSPI...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-23-2021, 10:53 PM
    Message received! Thanks for all you do for the community.
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-23-2021, 10:15 PM
    @Frank B, thanks for the tip about the UF2 bootloader. I re-read Paul's response about no breakpoints. If you read the OP's question it sounds like he was asking for USB based breakpoint capability, like you get...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-23-2021, 09:00 PM
    Arduino as an IDE is, I agree, terrible. But Arduino as a framework can be very useful to throw together simple projects. And there's nothing in it that prevents you from twiddling registers if you want. I find...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-22-2021, 02:36 AM
    Most, if not all of this, is available already. NXP supports its iMX.RT chips with the MCUExpresso package which includes a SDK that is based on the Arm CMSIS. They also offer FreeRTOS, iwIP, FATfs, and other middleware...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-22-2021, 02:11 AM
    While PlatformIO usually generates its makefiles automatically, custom builds with Arduino or other code on PlatformIO can be managed with script files...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-21-2021, 05:19 PM
    Yes, JTAG pins are regular I/O pins as with most modern MCUs. Unfortunately those pin have not been brought out from under the BGA on any of the previous 3.x / 4.x boards. The location of the pins does not matter as...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-20-2021, 07:32 PM
    A 1GHz CPU & GPU without JTAG is severely limited in its application. There are some things that simply can't be debugged without it. One opinion previously posted on this forum is that JTAG was left out out over...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-20-2021, 07:15 PM
    You can get information about Teensy mbed support at https://os.mbed.com/platforms/Teensy-3-1/ As far as I know they currently only support the Teensy 3.X. Mbed also supports a wide range of other processors and boards
    205 replies | 15732 view(s)
  • mlewus's Avatar
    03-20-2021, 07:11 PM
    And that is what they did :) See the C/C++ SDK link here: https://www.raspberrypi.org/documentation/rp2040/getting-started/ The Pi Foundation provides a C/C++ compiler, as well as a SDK that provides C/C++ libraries...
    205 replies | 15732 view(s)
  • mlewus's Avatar
    03-19-2021, 08:34 PM
    Wherever this finally leads it would be great if all of the pins on one of the new boards are on identical centers. It is at present very difficult to mount the Teensy 4.1 with pluggable M-F headers due to the...
    490 replies | 56011 view(s)
  • mlewus's Avatar
    03-19-2021, 08:10 PM
    Boards that support flashing via Ethernet have that support built into the bootloader by necessity, because anything else can be overwritten during the flashing procedure. I don't know for a fact that the Teensy 4.x...
    177 replies | 26860 view(s)
  • mlewus's Avatar
    03-16-2021, 03:26 PM
    I read the paper... it looks like an interesting and challenging project. And I agree with you, power is exceedingly important. But as much as I love my Teensy-s, they are not an optimal solution for you. A few things...
    28 replies | 1670 view(s)
  • mlewus's Avatar
    03-16-2021, 12:21 AM
    Question I have is, what is the OP trying to achieve? Not cost, certainly, as you can pick up a pi zero with 512k ram for $5 on Adaruit. If you're designing your own board, you can get an A8 CPU with a MMU for the same...
    28 replies | 1670 view(s)
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About mlewus

Basic Information

About mlewus
Biography:
Worked for Fortune 100 Tech companies in various tech director jobs, then became disabled in 2003 thanks to a couple of well meaning but overzealous back surgeons. Now I putter about.
Location:
New Jersey, USA
Interests:
Embedded hardware and embedded C/C++, Radio Control Hobby, Photography
Occupation:
Space-taker-upper :)

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