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57 lines
1.3 KiB
57 lines
1.3 KiB
7 years ago
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GEX Zero
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========
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This form factor is designed to be mechanically compatible with the
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Raspberry Pi Zero (W). This makes it possible to use PHATs and cases for the Pi Zero.
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Pins are mapped to the 20x2 header to maximize compatibility with PHATS.
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Functions like UART, SPI and I2C should all be available.
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## Pin mapping
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### Main header
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```none
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3V3 1 | 2 5V
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PB7 3 | 4 5V
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PB6 5 | 6 GND
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PA8 7 | 8 PB10
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GND 9 | 10 PB11
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PB1 11 | 12 PB8
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PA10 13 | 14 GND
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PB9 15 | 16 PA0
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3V3 17 | 18 PA1
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PB5 19 | 20 GND
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PB4 21 | 22 PA2
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PB3 23 | 24 PA3
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GND 25 | 26 PA4
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PB2 27 | 28 PA5
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PC10 29 | 30 GND
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PC11 31 | 32 PA7
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PB0 33 | 34 GND
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PB15 35 | 36 PA6
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PB12 37 | 38 PB14
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GND 39 | 40 PB13
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```
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### Small header
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GND, Debug TX (PA9), PA13, PA14 (SWD)
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## Radio interface
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This board has a position for NRF24L01+.
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The radio module uses one of the SPI ports as alternate functions on some otherwise unused PC pins.
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PB12 and PB14 can only be used as regular GPIO when the radio link is enabled, not SPI. PB13 must be
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left unconnected, as there is no available remap for the clock line.
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The radio module is used for remote control with the GEX Dongle and provides a fast, half duplex connection.
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