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