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A device tree for my LORA HAT..
- Brings a UART out for talking to the HAT
- Leaves pins
7,13and15free since these are used to control and monitor the HAT - Has the SPI interface in case I add a screen, and an I2C interface for talking to peripherals.
Nb: screen is https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(A)
MangoPI MQ Pro GPIO header (dtb name: MangoPi MQ Pro)
Gpio Header:
func des pin pin des func
3v3 1 --o o-- 2 5v
i2c0 (2502000.i2c:205) PG13 3 --o o-- 4 5v
i2c0 (2502000.i2c:204) PG12 5 --o o-- 6 gnd
free (39) PB7 7 --o o-- 8 PB8 uart0 (2500000.serial:40)
gnd 9 --o o-- 10 PB9 uart0 (2500000.serial:41)
free (117) PD21 11 --o o-- 12 PB5 free (37)
free (118) PD22 13 --o o-- 14 gnd
free (32) PB0 15 --o o-- 16 PB1 free (33)
3v3 17 --o o-- 18 PD14 spi1 (4026000.spi:110)
spi1 (4026000.spi:108) PD12 19 --o o-- 20 gnd
spi1 (4026000.spi:109) PD13 21 --o o-- 22 PC1 free (65)
spi1 (4026000.spi:107) PD11 23 --o o-- 24 PD10 spi1 (4026000.spi:106)
gnd 25 --o o-- 26 PD15 spi1 (4026000.spi:111)
free (145) PE17 27 --o o-- 28 PE16 free (144)
free (42) PB10 29 --o o-- 30 gnd
free (43) PB11 31 --o o-- 32 PC0 free (64)
free (44) PB12 33 --o o-- 34 gnd
free (38) PB6 35 --o o-- 36 PB2 uart4 (2501000.serial:34)
free (113) PD17 37 --o o-- 38 PB3 uart4 (2501000.serial:35)
gnd 39 --o o-- 40 PB4 free (36)
Other gpio outputs of interest:
-- PD18: Blue Status Led - gpio (2000000.pinctrl:114)
Notes:
- I2C pins 3,5,27 and 28 (PG13, PG12, PE17 and PE16) have 10K pullup resistors to 3v3
- The Status LED (PD18) is common with the LED_PWM pin on the DSI/LVDS output