I have both a Raspberry Pi 3a+ and 5 working with a Bittle (not X) with the 2x5 connector. I purchased the Orange Pi 2W 4G for the small size with > that 2GB of RAM. The pinouts look the same and the faq site says they are: "21. When it comes to low-level peripherals, what does compatible Raspberry Pi refer to?
A: It means that the 40pin pins are the same as Raspberry Pi."
(From: http://www.orangepi.org/orangepiwiki/index.php/FAQ)
But when I boot with them connected, the robot does odd things and the Orange PI cannot be logged into. I updated the firmware and I'm using the latest version of Debian Buster Server from Orange Pi.
Here is the output of gpio readall
It is much more readable when the display area is wider.
gpio readall+------+-----+----------+--------+---+ ZERO2W +---+--------+----------+-----+------+| GPIO | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | GPIO |+------+-----+----------+--------+---+----++----+---+--------+----------+-----+------+| | | 3.3V | | | 1 || 2 | | | 5V | | || 264 | 0 | SDA.1 | OFF | 0 | 3 || 4 | | | 5V | | || 263 | 1 | SCL.1 | OFF | 0 | 5 || 6 | | | GND | | || 269 | 2 | PWM3 | OFF | 0 | 7 || 8 | 0 | ALT2 | TXD.0 | 3 | 224 || | | GND | | | 9 || 10 | 0 | ALT2 | RXD.0 | 4 | 225 || 226 | 5 | TXD.5 | OFF | 0 | 11 || 12 | 0 | OFF | PI01 | 6 | 257 || 227 | 7 | RXD.5 | OFF | 0 | 13 || 14 | | | GND | | || 261 | 8 | TXD.2 | OFF | 0 | 15 || 16 | 0 | OFF | PWM4 | 9 | 270 || | | 3.3V | | | 17 || 18 | 0 | OFF | PH04 | 10 | 228 || 231 | 11 | MOSI.1 | OFF | 0 | 19 || 20 | | | GND | | || 232 | 12 | MISO.1 | OFF | 0 | 21 || 22 | 0 | OFF | RXD.2 | 13 | 262 || 230 | 14 | SCLK.1 | OFF | 0 | 23 || 24 | 0 | OFF | CE.0 | 15 | 229 || | | GND | | | 25 || 26 | 0 | OFF | CE.1 | 16 | 233 || 266 | 17 | SDA.2 | OFF | 0 | 27 || 28 | 0 | OFF | SCL.2 | 18 | 265 || 256 | 19 | PI00 | OFF | 0 | 29 || 30 | | | GND | | || 271 | 20 | PI15 | OFF | 0 | 31 || 32 | 0 | OFF | PWM1 | 21 | 267 || 268 | 22 | PI12 | OFF | 0 | 33 || 34 | | | GND | | || 258 | 23 | PI02 | OFF | 0 | 35 || 36 | 0 | OFF | PC12 | 24 | 76 || 272 | 25 | PI16 | OFF | 0 | 37 || 38 | 0 | OFF | PI04 | 26 | 260 || | | GND | | | 39 || 40 | 0 | OFF | PI03 | 27 | 259 |+------+-----+----------+--------+---+----++----+---+--------+----------+-----+------+| GPIO | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | GPIO |+------+-----+----------+--------+---+ ZERO2W +---+--------+----------+-----+------+I think I have to: 1. enable another uart (e.g. #4), 2. set the console= line to that one ( e.g. console=serial4 ?) 3. and then configure GPIO to ensure it's GPIO is in the 5x2 GPIO block used by the Bittle to interface Can anyone validate or correct this plan?
I followed the serial configuration instructions in @rhongzhongli link and the robot does not have spasms anymore. But only when attached to the Bittle I can't ssh because it never grabs an IP address. If it is powered independently it works. I think it might have to do with the OrangePi automatically assigning uart0 to bluetooth? The only available overlay is to disable it and then there are overlays to enabled uart2-5. I also can't find a setting for console= in /boot/orangepiEnv.txt that disables serial. So far the only values I've found are "both" or "serial" Is there a way to use one of the many other uarts in the orange pi for integrating with Bittle? Here is a relevant discussion thread: https://github.com/orangepi-xunlong/orangepi-build/issues/4
Would this section give you some insight on the problem? https://docs.petoi.com/history/upload-sketch-for-nyboard-software-1.0#id-4.1.-config-raspberry-pi-serial-port
It is supposedly compatible - but it freezes up the robot and the Orange pi becomes unresponsive to ssh.
Not sure why.
I'm interested in seeing where this goes and updates. I want to add a radxa 2 pro to a bittle.