Search results

PlatformIO is certainly a great piece of software (I tried it), but honestly I've better go the Arduino IDE or make your own build system with VS Code with makefiles - The "in between" is not my taste Not easy but, I've managed to get a working configuration based on...

Yeah, learning about the insides of the MPU is also very fun even if sometimes difficult. I struggled a little with the FTM (but not that much) and that was worth the try : not only I need go generate a stable clock but also have to run code when the clock goes HI or LO, with very few...

Dunno if it's meaningful in your case, but this is what I do to generate a 1MHZ signal with 50% duty for a 6502 cpu #define SIG_CLOCK 33 // is PORT E BIT 24 so E24 volatile uint32_t count; volatile bool isr_flag; void setup() { pinMode(SIG_CLOCK, OUTPUT); FTM0_SC = 0; FTM0_CNT =...

Sorry, that's a typo, the clock signal generated by the Teensy feed the pin 37 of the 6502... I meant PHI2 signal OUT (of the Teensy)

Just re reading my post I spotted than using C10 for R/W is wrong because C port is being put in Input or Output mode depending on the cpu cycle... So I switched R/W to E26, but still get erratic behavior...

Hi Olivier ! Glad to see that I'm not the only fool on earth to play with a Teensy and a 6502 :-) I adapted the Bus_access_simple example to my own wiring, but that did not worked. I got nothing, even lowering delay() in loop to small values Before giving a try with interrupts I did a lot of...

Very unfortunately, for the moment, I don't own an oscilloscope (being said I'll follow your advice to keep enough money back and buy a good one like the Rigol 1054Z)

How can these macros be adapted to a Teensy 3.6 running at 180MHZ ? I need accurate nanoseconds delays (10ns would be fine) for clock phases synchronization with an external CPU... Any hint ?

Luni, yesterday I received a cheap Saleae LA - Seems to work fine and it helped me to find that my duty cycle was wrong so I fixed the problem until I got a more-or-less 50% duty cycle at 1 MHZ I've switched to reading and writing ports directly instead of using DigitalReadFast and...

Ho yeah ! A clever use of a Logic Analyzer again ;-) https://forum.pjrc.com/threads/56496-About-buying-a-(not-too-expensive)-logic-analyzer I really learn a lot on this forum !

Mmmm, seems that I could go the chinese clone LA route (which I can find easily on amazon) + open source software and try to buy a second hand digital oscilloscope, 40MHZ minimum in good shape (this point is obvious but as a newbie I'm unable to check if an oscilloscope is ok or not, if he can...

As a beginner, my needs are a bit fuzzy but there are some use cases I can see - checking a clock signal I generate (is it the right frequency ? what is the duty cycle ? rise and fall time ?) - checking incoming digital signals from an 8 bits cpu I'm struggling with (when does this pin changes...

As a hobbyist (and an electronic noob) I'm wondering if having a logic analyzer would help me to better understand digital/analog signals and identify problems I don't want to spend too much money as I'm not a pro, and found these analyzers from a French company (could be better for customer...

BTW, Luni, how did you measured the execution time of the isr in nano seconds ?

It's an "educational" attempt, for the fun, to connect an old 6502 CPU to the teensy (the 6502 was a cpu found in countless computers from the mid 70's -> 80's) I'm trying to generate a clock and read back the address and data bus - The cycle, for what I understand from the 6502 specs, is made...

Just tried with constants, at 1MHZ the max digitalReadFast calls I can do before freezing is 8/9 (with 2 digitalWriteFast) So I'm stuck and need to switch to ports reading / writing

Good catch luni ! I tried with fewer iterations and yes, until 4 it's ok, above TS freezes So I'll try to optimize the isr code the best I can with digitalReadFast with constants and later with direct ports access Thanks ! EDIT : It's 4 iterations max with digitalRead and 6 with digitalReadFast

I made some progress, and managed to have a timer isr called around 1000000 times per second but I'm facing a weird crash that I don't understand I extracted all the meaningless parts of the code #include <Arduino.h> volatile uint32_t count; uint32_t last_count; uint32_t last_time; const...

Ok thanks for the hints ! I'll give it a try and come back here if I can't find my way through low level programming ;-)

I've read several threads on the forum about generating clock signals, timer but I'm puzzled I don't see how to achieve what I want I'm trying to use a T3.6 as a "glue" to an NMOS 6502 CPU - At this stage 28 meaningful signals from the 6502 are wired to Teensy pins and I triple checked the...

In my case it's about having at least one non usb OUTPUT, and it works fine Add AudioOutputAnalog dac1; to your code that should enable USB audio out to live its live...

https://github.com/Tactif-cie/Volume-Explorer Did it 2 weeks ago, you can tweak it, expend it, it's nothing but an old school 80's limited shell... ;-)

You're welcome ;-) BTW, if you want to use the i2c_t3 library everywhere you can create a "Wire" subdirectory in your local arduino path (on a Mac it's ~/Arduino/libraries) and put an Wire.h file with only one line #include <i2c_t3.h> Because the real Wire library is not compatible with...

Thanks ! That's good to know !

What is a round machine pin style ?

Thanks a lot !!

BTW, what is the part's name of the Line in / Line out connector header to use on the audio board ? I'm struggling to find it in online catalogs because I don't know what to search ...

Arduino IDE Serial Monitor again ? Because, with custom makefile outside of Arduino IDE your code runs.. as long enough to have me willing to seek a Netflix serie again ? ;-) Last output...

Good to know, I had the update too but did not tried to reverd to "default"... I'll give it a try

In my case I used the Arduino IDE, let say 1 week max, before switching to Visual Studio - I had 360 false entries, dunno if Arduino IDE is the only cause, I'll check and see

You'll never be able to debug on Teensy, at least without tough hardware mod

SdFat provides all the call needed to iterate a directory, and for each entry you can check its type (file or dir) and its attributes (date, etc) then decide to delete the file or not - But you have to write the code for this yourself, have a look at the examples...

'cos I use a big bunch of apps which I don't know how they will behave on Mojave (or even run), have a lot a custom settings and tools, and it'll take me 2 days of works without any warranty that I'll not fall in a trap. Given that I never install an OS upgrade over an existing system, but...

I'm coding a small shell utility and soon switched from SD to SdFat without problems... On teensy you only have to #include <SdFat.h> and declare variables as Sd2Card card; SdFatSdio sd; Then no pin on begin if (!sd.begin()) { term->println("sd begin error"); }

But I really wonder how PPPOE came into the dance ! How a Teensy can be seen as a PPPOE device ??

Dunno but I'll keep a eye on my network devices now ;-)

Okay, nightmare's end, sun is bright ;-) Thanks to these guys : https://apple.stackexchange.com/questions/349424/delete-many-network-configurations-at-once I used this Ruby script that must be sudo executed devices = `networksetup -listallnetworkservices` devices.split("\n").each do |device|...

I didn't noticed until today but reading this thread https://forum.pjrc.com/threads/44403-MacOS-Sierra-port-problem?highlight=usb+modem+serial+device I had a look to my network settings... I found 300+ devices in the list ! Removing them one by one with the Network Preference Panel will take me...

Yeah, IntelliSense often can't find the files included by your source code... I don't use PlatformIO anymore, but Makefile builds only and my settings are { "C_Cpp.intelliSenseEngine": "Tag Parser", //"Tag Parser", "C_Cpp.default.cppStandard": "c++14"...

I'm on Mac OS 10.12.6 (Sierra) and there's no problem nor with Arduino 146 with Arduino serial monitor neither with custom build (core from github master) + (iTerm2 or xterm) with tycmd monitor Tried Teensy on Mac usb Port, Teensy on Thunderbold Dock's USB, even on USB hub -> TB Dock : no loss...

Whoo !!! This tool is sick !! Thanks for the info !

That's beyond my skills ;-) But if you want to disable optimizations for a bloc of code you can use gcc pragmas - You can even put these lines in a function and use an attribute with optimization flags - Have a look here ...

I had a similar situation with -Waggressive-loop-optimizations The corresponding flag to disable these optimizations is -Wno-aggressive-loop-optimizations In your case it should be -Wno-sequence-point

Thanks a lot ! That's perfect :-)

I fixed the problem by editing AudioStream.h and adding a dtor to AudioStream class - May be bad done but at least all my test suites passe, and new / delete of AudioStream instances does not crash anymore - I tested with 10 millions alloc/dealloc, there's only one memory leak of the audio...

This is what I did, nothing special or beautifully crafted but it works fine - Might need to be refined in the future, but for now it has been a very very precious help during the previous days where I had to debug weird freezes ;-) https://bitbucket.org/tactif/faultreporter/src/master/

But you have to put this statement in your loop() function usbMIDI.read(); If you don't, handle_cc will never be called

I presume that the interrupt mechanism is handled behind the scene by the midi library and that handle_cc is not an interrupt routine, but yes every time a CC is received handle_cc is executed

You also can have a callback in your setup() for every cc message as usbMIDI.setHandleControlChange(handle_cc); Then declare the callback as void handle_cc(byte channel, byte control, byte value) { switch (control) { case 21: serial.print("knob 1 feedback: ")...

I know it's not a typical use case but to help me debugging my app I've coded a small test suite. So, in a real app I should (and I plan to) avoid instantiating and deleting AudioConnection instances, and in my app the AudioStream instances a kept while the app is running. But in my test cases...