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Added hint about missing traces on PCB

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Wolfgang Klenk 2017-11-13 10:31:46 +01:00
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README.md
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@ -15,6 +15,34 @@ default. For instructions on manual installation please refer to the
following site:
http://wiringpi.com/download-and-install/
### Check hardware revision of Dragino LoRa/GPS HAT
Look for a hardware revision number at the LoRa/GPS HAT PCB.
It should read "Lora/GPS HAT for RPI v1.3". If the version is below 1.3, you
need to add some traces. Locate the header pins DIO0, DIO1 and DIO2 on the PCB.
* DIO0 is already connected to physical pin #7 aka WiringPi pin 7 aka BCM pin 4.
* DIO1 *has to be manually connected* to physical pin #16 aka WiringPi pin 4 aka BCM pin 23.
* DIO2 *has to be manually connected* to physical pin #18 aka WiringPi pin 5 aka BCM pin 24.
The pin numbering may be confusing, but WiringPi can be used to print out all these
pin numbers.
pi@rpi3:~/lmic-rpi-lora-gps-hat $ gpio readall
+-----+-----+---------+------+---+---Pi 3---+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5V | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 0 | 7 || 8 | 0 | IN | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 1 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | ALT0 | 0 | 19 || 20 | | | 0v | | |
### Enable SPI interface
Per default, the SPI ports on the Raspberry Pi are disabled. You need to
manually enable them using raspi-config.