yeahtuna
Senior Member

Yes, it works. I used it read some values from an EEPROM chip connected to a Teensy 3.2. It's bare bones. To make it useful for communicating with chips, you would likely want to extend the class. For example,...

Upon further reading, seems that diode is needed to keep the voltage on VDD_USB_CAP a step behind VDD_SNVS_IN. The 10uF capacitor doesn't provide enough delay on its own?

Because my custom device will not be battery powered, I'm guessing I can simplify the following section: This is what I've got right now, but I assume I probably don't even need that diode in there, and possibly...

I just tested and it programs just fine with R7 using both the button or with _reboot_Teensyduino_().

I see. I will test, but it sounds like I don't need or want R7 in there. Thanks, Paul.

Thanks for the heads up. I'll replace R6 with 47K and R7 with 470K I guess.

If you reread my post, you'll see that I fully understand how to check if a midi device is connected, but you can't argue that method2 below is not typically 2 times faster than method1. In my case there are 4 midi, 4...

I managed to have the USBHost_t36.h set a flag whenever a device gets claimed. I can then periodically check and clear this one flag and do all my hotplugging / updating work. Let me know if you want so code and I'll...

I wrote out a very low level Bit Bang IC2 header only class. I think this will take care of my needs, but perhaps I'll try to tackle FlexIO further down the road. #ifndef __BIT_BANG_IC2__ #define __BIT_BANG_IC2__ ...

So if I use teensy pins 9 and 32, that should work with FlexIO2 right?

I'm pressed for digital pins too. There's not a lot of info on FlexIO. Can FlexIO run on only two digital pins? I'm still in prototyping. What two pins might I reserve so I can look at implementing flexIO in the...

Looks like i2C bit-banging is the solution.

Thanks, KurtE. Do you think there's any chance of getting this added to Teensy cores? #ifndef __TEENSY_AVAILABLE_CHECK__ #define __TEENSY_AVAILABLE_CHECK__ #include "Arduino.h" // Check for hardware Serial...

I got the 1.8V AP7313 and still no joy. Upon further inspection, my A5 (19) pin is connected to pin L5 or the MIMXRT1062D when it should be connected to J11. I guess I'll need to do another run of the PCB.

That's how I'm doing it. With 8k buffers, I can preload 1024 stereo samples. Would like to get that number closer 4096, but I'm already maxed out. Wouldn't be useful for my current plans, but would be useful for...

I got my custom T4.1 device up and running on my first attempt. I'm really happy and surprised as it was my first time working with a BGA. Unfortunately I'm having issues with the integrated audio board. Likely cause...

I removed the AP7313-12, and the VDDD pin of the SGTL5000 is still being driven to 1.57V. I've seen in some other posts that say VDDD needs to be 1.8V. Do I need to use AP7313-18SA instead? The SGTL5000 datasheet...

Resoldered and still no go. Something that's off is the VDDD (1.57V). I'm using AP7313-12SA, so it should be 1.2V. I pulled the SGTL5000 off the board again, and the AP7313 is measuring 1.2V as it should, so...

As sure as I can be. I guess I'll pull it off and resolder it.

I've checked all the clock lines with a scope and they seem to be getting signals. VDDD is 1.57V, VDDIO and VDDA are both 3.3V. According to the the SGTL5000 datasheet, VAG should be showing VDDA/2 (1.65V), but my...

It looks like one of my data lines has a short to ground somewhere. It's not an issue with the by PCB, and hopefully it's not a solder blob under the MCU. Thanks. UPDATE: Was an issue with the vertical USB A port....

Not sure yet. I can only describe it as acceptable. I'll test when I get my 4.1 device up and running.

I'll try swapping out my TPD3S014DBVR for a TPD3S044DBVR.

For clarification, I have a powered hub connected to the host port, and the SSD connected to the hub and that works reliably. The externally powering the Teensy with 5v adapter, and plugging the SSD directly into the...

Btw, for future reference, is there a command to malloc to spram?

While not recommended for the faint of heart, I've reimplemented my code to work with pointers so I can dynamically create and remove instruments. I envision simply putting in a flash drive or SD card with samples.and...

Not working on this much today, but I wanted compare the performance of 1 AudioStream object playing back 16 stereo tracks simultaneously vs 4 AudioStream objects each playing back 4 stereo tracks. To get an idea of...

Boundary issues indeed. I'm now up to 18 stereo tracks using 4KB buffers/reads. But again, out of memory.

I need the third buffer in case I need to restart playing a voice while it's being played. I'll take a peek at your code tomorrow to see how you figure out those cluster boundaries. That's something I didn't think of.

I did a quick test. int totalBytesRead = 0; for (int i = 0; i < NUM_TEST_FILES; i++) { if (fileToRead.available()) { totalBytesRead += fileToRead.read(readBuffer,...

I'm quite confident that with 4KB reads, 14 tracks stereo is about as good as it gets, and I doubt the T4.1 would improve much on that because it comes down to random file access time. The same is true for SD cards I...

So the first order of business today was to decouple my AudioFile class from my AudioVoice class. This allows me to have a single buffer (4K) for the AudioFile, and two (4K) buffers for the voice. The idea is to allow...

Yup... That does the trick.

I'm trying to get an M.2 SSD drive working. It's a 512 GB drive, with a single 64G FAT32 partition. During initialization, it's getting stuck in the following sequence: WaitMediaReady() -> msTestReady() ->...

So today I managed 32 simultaneous mono voices at 16 samples latency without dropping packets. The key is to do all buffering outside of the update() methods. Each voice has three buffers. I reserve one buffer for...

Thanks for the link. I've read through your description and it looks very interesting. You're doing a lot of the things that I was considering (using PSRAM for example). That 70us was not including audio latency. I...

Yes, I have seen that tool. I'm interested in testing the limits of audio library with an SSD connected to a USB host port on Teensy 4.1. I need to figure out how to optimize things to get the maximum number of...