BBB-COMMS-2

Features

Extensive I/O connections

• (13) GPIOs - GVS (Ground/Voltage/Signal) pins
  • GVS (Ground/Voltage/Signal) pins
• (3) UARTs - GVTxRx (Ground/Voltage/Tx/Rx) pins
  • GVTxRx (Ground/Voltage/Tx/Rx) pins
• (1) I2C bus- GVSdaScl (Ground/Voltage/SDA/SCL) pins
  • GVSdaScl (Ground/Voltage/SDA/SCL) pins
  • Support for keyed headers
• Cape Support features
  • Cape configuration EEPROM with write enable jumper
• Beaglebone Black form factor
• Power LED

Headers and Connectors

Header

H1 - Write Enable Header

• Install jumper onto header to allow writes to EEPROM
• Remove jumper from header to prevent writes to EEPROM

Connectors

H2-H9 = 4 Pin Headers

Card Header	GPIO	BBB Pin
H2-3	N/A	N/A
H2-4 (Key)
No pin

N/A	N/A
H3-3	GPIO3_19	P9_27
H3-4	GPIO1_17	P9_23
H4-3	UART1_TX	P9_24
H4-4	UART1_RX	P9_26
H5-3	UART2_TX	P9_21
H5-4	UART2_RX	P9_22
H6-3	I2C_SDA	P9_18
H6-4	I2C_SCL	P9_17
H7-3	EHPWM1B	P9_16
H7-4	GPIO1_16	P9_15
H8-3	EHRPWM1A	P9_14
H8-4	GPIO1_28	P9_12
H9-3	UART4_TX	P9_13
H9-4	UART4_RX	P9_11

H10-H17 = 3 Pin Headers

Card Header	GPIO	BBB Pin
H10-3 (KEY)
No pin

N/A	N/A
H11-3	GPIO1_29	P8_26
H12-3	GPIO2_1	P8_18
H13-3	GPIO0_27	P8_17
H14-3	GPIO1_14	P8_16
H15-3	GPIO1_15	P8_15
H16-3	GPIO1_12	P8_12
H17-3	GPIO1_13	P8_11

Production Testing

Setup

• Install BBB-COMMS-2 on BBB
• Install shunt at H1 (Write Enable)
• Ethernet connection to BBB
• Power via 5V jack to BBB
• Verify 3.3V LED is lit
• Log in via putty
  • User = root
  • Password = enter

GPIO Testing

• Hook up LED-32 Card to these pins

D0 = "P8_26"
D1 = "P8_17"
D2 = "P8_15"
D3 = "P8_11"
D4 = "P9_23"
D5 = "P9_26"
D6 = "P9_22"
D7 = "P9_15"
D8 = "P9_12"
D9 = "P9_11"

D16 = "P8_18"
D17 = "P8_16"
D18 = "P8_12"
D19 = "P9_27"
D20 = "P9_24"
D21 = "P9_21"
D22 = "P9_16"
D23 = "P9_14"
D24 = "P9_13"

• Run test via:

cd ~/pyBBB/BBB-COMMS-2/blink-BBB-COMMS-2/
python blink-BBB-COMMS-2.py

I2C Testing/EEPROM Programming

• Go to directory
• Program the EEPROM
• Verify by typing

cd ~/pyBBB/BBB-COMMS-2/mkeeprom
cat data.eeprom > /sys/bus/i2c/devices/1-0054/eeprom
cat /sys/bus/i2c/devices/1-0054/eeprom | hexdump -C

• Result should be like -

00000000  aa 55 33 ee 41 30 42 42  42 2d 47 56 53 2d 33 00  |.U3.A0BBB-COMMS-|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |2...............|
00000020  00 00 00 00 00 00 58 31  00 00 4c 61 6e 64 20 42  |......X1..Land B|
00000030  6f 61 72 64 73 2c 20 4c  4c 43 42 42 42 2d 47 56  |oards, LLCBBB-CO|
00000040  53 2d 33 00 00 00 00 00  00 00 00 00 30 30 30 30  |MS-2........0000|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000000e0  00 00 00 00 00 00 00 00  00 00 00 00 00 fa 01 f4  |................|
000000f0  00 fa 00 00 ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
00000100  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00008000

• Remove WE jumper
• Type

cat data.eeprom > /sys/bus/i2c/devices/1-0054/eeprom
 

• Result should be error

root@BBB01:~/pyBBB/BBB-COMMS-2/mkeeprom# cat data.eeprom > /sys/bus/i2c/devices/1-0054/eeprom
cat: write error: Connection timed out

• Prepare to re-run
• Type

halt

• Combined Copy/Paste

cd ~/pyBBB/BBB-COMMS-2/blink-BBB-COMMS-2
python blink-BBB-COMMS-2.py

cd ~/pyBBB/BBB-COMMS-2/mkeeprom/
cat data.eeprom > /sys/bus/i2c/devices/1-0054/eeprom
cat /sys/bus/i2c/devices/1-0054/eeprom | hexdump -C
 

BBB-COMMS-2 Assembly Sheet/Parts List
* BBB-COMMS-2 Rev X1 Assembly Sheet