@alessandro-giusti said in External trigger on duet 3 6hc:
I bought and connected the sammy-c21 card, followed the guide and connected the card in can bus with duet 3 6hc.
The sammy-c21 communicates with duet, with the command m115 I have the following answer: m115 b124
Duet SAMMYC21 firmware version 3.3beta2 (2021-03-10 10:08:39).
Are there any special pins I need to use for a momentary button or is any pin okay?
When I declare them in the config.g do I have to specify the bus address of the card?
Thanks in advance.
Here's an extract from the pin table for the standard SAMMYC21 build in firmware 3.3beta:
Nx, nullptr }, // PA00 not on board
Nx, nullptr }, // PA01 not on board
Nx, "temp0" }, // PA02
Nx, "temp1" }, // PA03
4, "pa04" }, // PA04
5, "pa05" }, // PA05
6, "pa06" }, // PA06
7, "pa07" }, // PA07
Nx, "pa08" }, // PA08
Nx, nullptr }, // PA09 driver EN
Nx, nullptr }, // PA10 driver DIR
Nx, nullptr }, // PA11 driver STEP
12, "pa12" }, // PA12
13, nullptr }, // PA13 accelerometer INT1
Nx, nullptr }, // PA14 crystal
Nx, nullptr }, // PA15 crystal
Nx, nullptr }, // PA16 SPI
Nx, nullptr }, // PA17 SPI
Nx, nullptr }, // PA18 SPI
3, "pa19" }, // PA19
Nx, "pa20" }, // PA20
Nx, "pa21" }, // PA21
Nx, nullptr }, // PA22 I2C
Nx, nullptr }, // PA23 I2C
Nx, "pa24" }, // PA24
Nx, "pa25" }, // PA25
Nx, nullptr }, // PA26 not on chip
Nx, nullptr }, // PA27 CAN transceiver standby
Nx, nullptr }, // PA28 LED 0
Nx, nullptr }, // PA29 not on chip
Nx, nullptr }, // PA30 swclk
Nx, nullptr }, // PA31 swdio
Nx, nullptr }, // PB00 not on chip
Nx, nullptr }, // PB01 not on chip
Nx, nullptr }, // PB02 USB interface (SERCOM5 pad 0)
Nx, nullptr }, // PB03 USB interface (SERCOM5 pad 1)
Nx, nullptr }, // PB04 not on chip
Nx, nullptr }, // PB05 not on chip
Nx, nullptr }, // PB06 not on chip
Nx, nullptr }, // PB07 not on chip
8, "pb08" }, // PB08
9, "!^button0" }, // PB09 button recognised by bootloader
You can use any pin that has an interrupt number in the first column (i.e. not "Nx") and a name in the second column. So 9 pins available in total. If you use PB09 then it must not be grounded when power is applied unless you want the SAMMYC21 to reload the firmware over CAN.
You do need to specify the CAN address, also you will need to enable the pullup resistor unless you add an external one. For example: "^124.pb08".
