brtaylor
Senior Member

Yes, I did a prototype run and those work fine with the updated core software. Between grant writing season and contract work I haven't gotten around to putting together a production run; thanks for the reminder, I'll...

Can you post the header and source of your modified library enabling the additional packets?

https://www.pjrc.com/teensy/schematic.html

Honestly, the best approach might be to get a Raspberry Pi and have the Raspberry Pi program the Teensy.

The beauty of the MIT license is that you can do what you want with the code. I can take a look if I have time, no guarantees.

Pin 24 is PTE20 and Pin 25 is PTE21 (A10 and A11 in the schematic). The problem is that TMK is for Atmel AVR boards and Teensy 3.x and LC are ARM - they're completely different and I would expect TMK not to work without...

https://www.pjrc.com/teensy/schematic.html

I'm not sure about the cap, but the greyed out crystal is the optional 32.768 kHz crystal you can add to the bottom of the board. See the pinout here: https://www.pjrc.com/teensy/pinout.html

Doesn't matter as much with the Teensy - the main issue is not overrunning the serial buffers before the library has a chance to parse.

The if (gps.readSensor()) returns true only on a valid packet. It is safe to use that data afterwards. The issue with delays in your code seem to be your arduino board (a nano) seems to have a very small serial...

SBUS works: https://github.com/bolderflight/SBUS

Also, just my curiosity, but where did you download that MPU9250 library from?

I really like these changes. CAN-FD is something that I'm interested in using for the higher data rate transfers compared with CAN and I'm happy to have the UART bumped over to match Teensy 3.x - some of my breakout...

Get rid of the delay in your test program, it might be causing issues: #include "UBLOX.h" UBLOX gps(Serial, 9600); //Serial-not Serial 1-3!!!!! bool led = LOW; void setup() { pinMode(2, OUTPUT); ...

Not without information from additional sensors (i.e. vicom, GNSS, WiFi / Cell signal SLAM, odometer or speedometer, etc).

Well, as Frank said, how fast do you need it? Looks like you should be able to get 440 us via I2C. If you need faster reads, then better go with SPI.

I dug out my MPU-9250 (essentially the same as your MPU-6050) and ran your code. My hardware setup is using 4.7kOhm resistors for pullup to +3.3V. When I run this, I get a read time (t2 - t1) of 1.6 ms as you report. ...

Use your quaternion to rotate the accelerometers into an inertial frame, subtract gravity, and integrate twice (once for inertial velocity and again for inertial position). Your solution will be very erroneous, but...

It's silly, Invensense placed the temperature registers in between the accelerometer and gyro data registers. It's faster to do a burst read of 14 bytes (accel data, temp data, then gyro data) than two 6 byte...

The biggest issue I see with your code is that you should use Wire.setClock() to set the I2C speed. Right now, your code is only using 100 kHz and you should be using 400 kHz.

Yes, I found no work around if their bus locked. My only solution was to carefully design how my program started talking to the MPU-9250 (since, in an Arduino environment, the sketch could have been flashed with a...

A question regarding voltage references. I'm planning on using the TI REF5025 (http://www.ti.com/lit/ds/symlink/ref5020.pdf) voltage reference to provide a 2.5V reference. Similarly, I'm planning on also using the...

Yes, it sounds like an I2C line on the MPU-9250 is getting held. On Teensy we have options to reset the bus, but the MPU-9250 doesn't have those options. Resetting and re-initializing won't work, because the AK8963 is...

I think it's interesting the reference manual mentions NAND and EMMC. One big item that's been on my wish list for the Teensy 3.x is availability of large amounts of non-volatile memory. Has anyone looked into it yet?

Some notes regarding analog - this seems like it's defined in analog.c, static const uint8_t pin2sc1a, which is an array where the index is the pin number and the stored value refers to the ADC channel number. For...

Thanks! I kind of like this approach - seems like it could be lower noise than my original idea.

When you call pinMode, portConfigRegister is called, which is defined in pins_arduino.h. This is simply calling digital_pin_bitband_and_config_table_struct digital_pin_to_info_PGM from pins_teensy.c with the index of...

Huh, I haven't been able to duplicate the freezing yet, but I think you would need to configure the pins in pins_teensy.c around line 106.