Added hint about missing traces on PCB
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README.md
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README.md
@ -15,6 +15,34 @@ default. For instructions on manual installation please refer to the
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following site:
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http://wiringpi.com/download-and-install/
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### Check hardware revision of Dragino LoRa/GPS HAT
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Look for a hardware revision number at the LoRa/GPS HAT PCB.
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It should read "Lora/GPS HAT for RPI v1.3". If the version is below 1.3, you
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need to add some traces. Locate the header pins DIO0, DIO1 and DIO2 on the PCB.
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* DIO0 is already connected to physical pin #7 aka WiringPi pin 7 aka BCM pin 4.
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* DIO1 *has to be manually connected* to physical pin #16 aka WiringPi pin 4 aka BCM pin 23.
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* DIO2 *has to be manually connected* to physical pin #18 aka WiringPi pin 5 aka BCM pin 24.
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The pin numbering may be confusing, but WiringPi can be used to print out all these
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pin numbers.
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pi@rpi3:~/lmic-rpi-lora-gps-hat $ gpio readall
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+-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+
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| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
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+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
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| | | 3.3v | | | 1 || 2 | | | 5v | | |
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| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5V | | |
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| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
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| 4 | 7 | GPIO. 7 | IN | 0 | 7 || 8 | 0 | IN | TxD | 15 | 14 |
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| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
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| 17 | 0 | GPIO. 0 | IN | 1 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
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| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
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| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
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| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
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| 10 | 12 | MOSI | ALT0 | 0 | 19 || 20 | | | 0v | | |
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### Enable SPI interface
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Per default, the SPI ports on the Raspberry Pi are disabled. You need to
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manually enable them using raspi-config.
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