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Describe your issue:
Confused/lost!
Setting up Manta M5P with CB1. Would like to utilize native GPIO for peripheral control. Would appreciate thoughts on two questions:
1- which, if any, GPIO pins on the M5P are available for other uses?
2- I ran ‘gpioinfo’ and got the attached file list. It shows 2 gpiochips (0 & 1). Are they both on the CB1? How does one relate the unused lines on this list with the GPIO pins on the board?
Sorry, 3 questions!
Any insights or directions would be greatly appreciated.
For accessing GPIO information and support, search on “BTT Pi 1.2” as that’s what the CB1 is based on.
I have played around with the CB1 GPIOs over the years in terms of adding an ADXL345, the BTT SPI 3.5 display and my own Functional Test hardware/software and what I learned is that if you want consistent IO operations that are well documented with lots of people having experience with it, go with a genuine Raspberry Pi CM4 (and if you can’t find it there, look for Raspberry Pi 4B operation).
The CB1 is good if you just need an SBC for a Manta M#P without any IO other than USB and Ethernet: HMDI and CSI/DSI are not connected and, as noted above, the GPIO is wonky.
The CB2 is better with HDMI and a kind of working CSI/DSI but still not as good as a genuine Raspberry Pi SBC.
Thanks for the info. I have the pinout for the connector you pointed out; I guess I was asking if all of the assigned GPIO pins are available for other uses, or are some/all serving internal functions?
Good link - thanks. When I bought this setup the RPi was backordered. Unfortunately, I’m tied into the CB1, with the current video setup and existing addresses.
Looks good - sorry, I thought the HDMI wasn’t connected on the CB1 (memory is going).
Yeah, I don’t know what’s going on with the CM4 right now - I needed a few a couple of weeks ago and they were backordered here in Canada for my usual suppliers as well as Digi-Key and Mouser. I ended up buying CM5s (work pretty much the same, just faster and hotter).
Just doing a quick look and they’re back in stock - I usually get the CM4101000 (“lite” - not eMMC with WiFi).
After much digging, I found the following answers to the original questions:
1-GPIO0 refers to the pins on the CB1; GPIO1 refers to the pins on the M5P native processor. 2-All of the pins on the 40-pin connector originate with the CB1 and are free and available. 3-To address them, one needs to define the pin with the following format: !host:GPIO# and follow with ‘SET_PIN command to turn off or on with the following format: SET_PIN PIN=host:GPIO# VALUE=(#) with the first # the specific pin number and the second # as 0 for off and 1 for on.
Sorry it’s not exactly this way, but if works, is a good way, here one example:
[temperature_fan BTT-Pi_CPU] # Temperatura interna del procesador de la BTT Pi, usada para controlar su propio ventilador, en función de la temperatura
pin: BTT-Pi:gpio211
max_power: 1.0
shutdown_speed: 0
sensor_type: temperature_host
target_temp: 40
max_temp: 85
min_temp: 5
control: pid
pid_kp: 1.0
pid_ki: 0.5
pid_kd: 2.0
off_below: 0.1 # Mantener apagado si la potencia aplicada está por debajo de este valor
min_speed: 0.15 # Por defecto la velocidad minima es 0.3 # 20250228
