9260 Communications Board
The 9260 Communications board attaches to the 9260 Quick Start Kit and provides standard headers for most of the peripherals. The peripherals supported by the Snapper 9260 Communications board are:
- USB host (one standard plug, one header)
- RS232 UARTs (one DB9, one RS232-level header, one CMOS-level header)
- Audio in/out
- Bluetooth
- SDIO
- LCD, with Touchscreen
- RTC Battery Backup
Snapper 9260 QSK GPIO Usage
| GPIO | Peripheral Function | Comms Board Function |
| PA0 | B | SD Data 0 |
| PA1 | B | SD Command |
| PA3 | B | SD Data 3 |
| PA4 | B | SD Data 2 |
| PA5 | B | SD Data 1 |
| PA8 | A | SD Clock |
| PA23 | Not Connected | |
| PA24 | Not Connected | |
| PA26 | GPIO | Touchscreen XN |
| PA27 | GPIO | Touchscreen YN |
| PB0 | GPIO | LCD Data/Command select |
| PB1 | A | LCD Data |
| PB2 | A | LCD Data Clock |
| PB3 | A | LCD Chip Select |
| PB4 | A | UART0 Transmit |
| PB5 | A | UART0 Receive |
| PB6 | A | UART1 Transmit |
| PB7 | A | UART1 Receive |
| PB8 | A | UART2 Transmit |
| PB9 | A | UART2 Receive |
| PB10 | Not Connected | |
| PB11 | Not Connected | |
| PB12 | Not Connected | |
| PB13 | Not Connected | |
| PB20 | Not Connected | |
| PB21 | Not Connected | |
| PB22 | Not Connected | |
| PB23 | Not Connected | |
| PB24 | Not Connected | |
| PB25 | Not Connected | |
| PB26 | Not Connected | |
| PB27 | Not Connected | |
| PB28 | Not Connected | |
| PB29 | Not Connected | |
| PB30 | Not Connected | |
| PB31 | Not Connected | |
| PC0 | GPIO | SD Card Detect |
| PC1 | Not Connected | |
| PC2 | AD2 | Touchscreen YP |
| PC3 | AD3 | Touchscreen XP |
Details
USB Host
The USB hosts on the Snapper 9260 are exposed as a single USB Type-A socket (J8), and a 2.54mm male pin-header (J7). The pin header is of the same pin-out to those found on most desktop computer mother boards. To adapt it to a standard socket will require a cable commonly know as a USB v2.0 to Female Motherboard Header Connector. There are available from numerous vendors ie: FrontX, Amazon
| Pin | Colour | Function |
| 1 | Red | +5V / Voltage + / VCC |
| 2 | White | D - / Data - / USB - |
| 3 | Green | D + / Data + / USB + |
| 4 | Black | GND / Voltage - / Ground |
| 5 | Black | S-GND / Over Current / Shielding |
Serial
Three of the Snapper 9260 serial ports are exposed.
- UART0 is available as a standard RS232 level two-wire DB9 (J3)
- UART1 is exposed as a two-wire RS232-level 2x5 pin-header (J6), suitable for attaching to a DB9 socket
- UART2 or as a 3.3 volt 2x6 pin header (J5) suitable for attaching to the Bluewater Systems Bluetooth expansion module.
Note: In order to allow re-use of the RXD pins for other purposes, there are Jumpers which must be placed to enable the RS232 transceiver. If J3 is to be used, the J15 jumper must be fitted. If J6 is to be used, the J4 jumper must be fitted.
The pin-out of the J6 connector is as follows:
| Pin | Function |
| 1 | Not connected |
| 2 | Not connected |
| 3 | RXD |
| 4 | Not connected |
| 5 | TXD |
| 6 | Not connected |
| 7 | Not connected |
| 8 | Not connected |
| 9 | Ground |
| 10 | Not connected |
Bluetooth
This connector is compatible with the Bluewater Rig200 Bluetooth+ Module.
Audio
Line-in (J11), Line-out (J9), and headphone out (J10) connectors are provided as standard 2.5mm stereo connectors.
SD
There is a standard SD connector (J27) available. Cards will be automatically detected on insertion, and appropriate drivers loaded if available. This is supported by the Linux AT91 MCI driver.
LCD
A connector (J14) is provided compatible with the K350QVG Smart LCD. This LCD is attached to the SPI bus on the Snapper 9260 for the LCD data, and to two of the ADCs for touchscreen support. A driver is provided in the Linux kernel which supports the LCD as a standard framebuffer device, and exposes the touchscreen as a Linux input device.
RTC Battery Backup
A battery holder, J1, can accept a 3V CR1025 coin-cell style battery. This provides a backup battery for the external RTC available on Snapper9260. If this is fitted, then the module will retain its clock state during full power-off.
