BBB-GVS-3

Features

• (19) GPIOs, GVS pins
  • GVS pins
• (3) UARTs, GVTxRx pins
  • Gnd, Vcc, Tx, Rx pins
• (1) I2C bus, G, V, SDA, SCL
  • Ground, Voltage, SDA, SCL
• (8) Channels of 3.3V to 5V level translators
  • Use female to female jumpers to route the GPIO lines to the translator channels
  • 5V side has GVS pins
• (7) 1.8V analog GVS connections with analog voltage/ground
  • Buffer Opamps on the analog inputs
• 5V pins are all ESD protected pins with 15 kV of protection
• Selectable 5V source (SYS_5V or VDD_5V)
• LEDs for 3.3V and 5V power
• Cape configuration EEPROM with write enable jumper
• Beaglebone Black form factor

Connectors

J1 Connector

Conn	GPIO		BBB Pin
J1	SPI1_D1		P9_30

J2 Connector

Conn	GPIO		BBB Pin
J2	GPIO3_19	P9_27

J3 Connector

Conn	GPIO		BBB Pin
J3_3	UART1_RX	P9_26
J3_4	UART1_TX	P9_24

J4 Connector

Conn	GPIO		BBB Pin
J4	GPIO1_17	P9_23

J5 Connector

Conn	GPIO		BBB Pin
J5_3	UART2_TX	P9_21
J5_4	UART2_RX	P9_22

J6 Connector

Conn	GPIO		BBB Pin
J6_3	I2C1_SDA	P9_18
J6_4	I2C1_SCL	P9_17

J7 Connector

Conn	GPIO		BBB Pin
J7	GPIO1_16	P9_15

J8 Connector

Conn	GPIO		BBB Pin
J8_3	UART4_TX	P9_13
J8_4	UART4_RX	P9_11

J9 Connector

Conn	GPIO		BBB Pin
J9	EHRPWM1A	P9_14

J10 Connector

Conn	GPIO		BBB Pin
J10	GPIO1_28	P9_12

J12 Connector

Conn	GPIO		BBB Pin
J12	GPIO1_29	P8_26

J13 Connector

Conn	GPIO		BBB Pin
J13	EHRPWM2A	P8_19

J14 Connector

Conn	GPIO		BBB Pin
J14	GPIO2_1		P8_18

J15 Connector

Conn	GPIO		BBB Pin
J15	GPIO0_27	P8_17

J16 Connector

Conn	GPIO		BBB Pin
J16	GPIO1_14	P8_16

J17 Connector

Conn	GPIO		BBB Pin
J17	GPIO1_15	P8_15

J18 Connector

Conn	GPIO		BBB Pin
J18	EHRPWM2B	P8_13

J19 Connector

Conn	GPIO		BBB Pin
J19	GPIO1_12	P8_12

J20 Connector

Conn	GPIO		BBB Pin
J20	GPIO1_13	P8_11

J21 Connector

Conn	GPIO		BBB Pin
J21	TIMER5		P8_09

J22 Connector

Conn	GPIO		BBB Pin
J22	TIMER6		P8_10

J23 Connector

Conn	GPIO		BBB Pin
J23	TIMER4		P8_07

J24 Connector

Conn	GPIO		BBB Pin
J24	TIMER7		P8_08

J11 - Write Enable (WE)

• Install for write enable
• Remove for write protect

EEPROM Connections

• The EEPROM connections are on I2C and have on-board pullup resistors.
• The connections are local to the card.
• The EEPROM part number is CAT24C256WI-GT3

Python pin assignments by header J number

J1 = "P9_30"		# GR-1 - D0
J2 = "P9_27"		# BL-1 - D16
J3_3 = "P9_26"		# VI-1 - D1
J3_4 = "P9_24"		# GY-1 - D17
J4 = "P9_23"		# WH-1 - D2
J5_3 = "P9_21"		# BL-1 - D18
J5_4 = "P9_22"		# BR-2 - D3
J7 = "P9_15"		# RD-2 - D19
J8_3 = "P9_13"		# OR-2 - D4
J8_4 = "P9_11"		# YL-2 - D20
J9 = "P9_14"		# GR-2 - D5
J10 = "P9_12"		# BU-2 - D21
J20 = "P8_11"		# VI-2 - D6
J21 = "P8_9"		# GY-2 - D22
J22 = "P8_10"		# WH-2 - D7
J23 = "P8_7"		# BL-2 - D23
J24 = "P8_8"		# BR-3 - D8
J12 = "P8_26"		# RD-3 - D24
J13 = "P8_19"		# OR-3 - D9
J14 = "P8_18"		# YL-3 - D25
J15 = "P8_17"		# GR-3 - D10
J16 = "P8_16"		# BU-3 - D26
J17 = "P8_15"		# VI-3 - D11
J18 = "P8_13"		# GY-3 - D27
J19 = "P8_12"		# WH-3 - D12

Production Testing

Setup

• Install BBB-GVS-3 on Rev C BeagleBone Black card
• Install shunt at SYS on J25 (5VSEL)
• Install shunt at WE
• Ethernet connection to BBB
• Power via 5V jack to BBB
• Verify 5V and 3.3V LEDs are lit
• BBB are located on the Secondary net at:
  • BBB Rev C - 192.168.2.109
  • BBB Rev B - 192.168.2.110
• Log in via putty
  • User = root
  • Password = enter

EEPROM Programming

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

cd ~/pyBBB/BBB-GVS-3/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-GVS-3.|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
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-GV|
00000040  53 2d 33 00 00 00 00 00  00 00 00 00 30 30 30 30  |S-3.........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-GVS-3/mkeeprom# cat data.eeprom > /sys/bus/i2c/devices/1-0054/eeprom
cat: write error: Connection timed out

Analog Testing

• GRID49 card has a resistor ladder
  • (8) 10K resistors
  • From 1.8V to all 7 inputs to ground
  • Input in 1/8 steps
• Cable connections
  • 1x9 end marked "PROTOA12" plugs into resistor card with "PROTOA12" label facing towards resistors
    • Green wire at A1 grid location on GRID49 card, white wire at K12 grid location
  • 3-pin connector marked "A5" goes to A5
    • Label faces Ethernet jack
    • Green wire goes to ground, white wire goes to +1.8V
• Run analog ladder code
  • May need to run 2x to get accurate value

cd ~/pyBBB/BBB-GVS-3/analogLadder
python analogLadder.py
 

• Pass/Fail message will be displayed
• Ideal values are

val0  0.625
val1  0.125
val2  0.75
val3  0.24
val4  0.50
val5  0.375
val6  0.875
PASS - Analog values match expected ladder values

GPIO Testing

Cable set

• Cables connect LED-32 card in ODAS Test Station to UUT

LED-32 connections

• Hook up LED-32 Card to these pins
  • Connect LED32-1 to LED-32 card at pin 1
  • Connect LED32-21 to LED-32 card at pin 21

BBB-GVS-3 connections

• Connect "loose" 1x8 cable marked "3.3V-SIG" from UUT 3.3V side of translator, connect to "J12-SIG" UUT J12
• Connect 1x8 cable from LED-32 marked "GND" to UUT 5V side of translator GND pins
• Connect 1x8 cable from LED-32 marked "5V-SIG" to UUT 5V side of translator
• Connect 1x5 cable from LED-32 marked "J20-SIG" to UUT J20 SIG pins
• Connect 2x5 cable from LED-32 marked "J1-SIG" to UUT J1
• Connect 2x5 cable from LED-32 marked "J7-SIG" to UUT J6

D0 = "P9_30"		# GR-1 - D0
D1 = "P9_26"		# VI-1 - D1
D2 = "P9_23"		# WH-1 - D2
D3 = "P9_22"		# BR-2 - D3
D4 = "P9_13"		# OR-2 - D4
D5 = "P9_14"		# GR-2 - D5
D6 = "P8_11"		# RD-3 - D6
D7 = "P8_10"		# YL-3 - D7
D8 = "P8_8"		# BU-3 - D8
D9 = "P8_19"		# GY-3 - D9
D10 = "P8_17"		# VI-2 - D10
D11 = "P8_15"		# WH-2 - D11
D12 = "P8_12"		# BR-3 - D12
D27 = "P8_13"		# BL-2 - D27
D26 = "P8_16"		# GY-2 - D26
D25 = "P8_18"		# WH-3 - D25
D24 = "P8_26"		# VI-3 - D24
D23 = "P8_7"		# GR-3 - D23
D22 = "P8_9"		# OR-3 - D22
D21 = "P9_12"		# BU-2 - D21
D20 = "P9_11"		# YL-2 - D20
D19 = "P9_15"		# RD-2 - D19
D18 = "P9_21"		# BL-1 - D18
D17 = "P9_24"		# GY-1 - D17
D16 = "P9_27"		# BL-1 - D16
# Common Ground

Run test

cd ~/pyBBB/BBB-GVS-3/blink-BBB-GVS-3/src
python blink-BBB-GVS-3.py
 

• Lights will circulate around the card in a ring
• CTRL-C to end test

Prepare to re-run

• Type

halt

• Remove 5V Power cable to power of card

Combined Copy/Paste

cd ~/pyBBB/BBB-GVS-3/mkeeprom
cat data.eeprom > /sys/bus/i2c/devices/1-0054/eeprom
cat /sys/bus/i2c/devices/1-0054/eeprom | hexdump -C

cd ~/BBB/BBB-GVS-3/analogLadder
python analogLadder.py

cd ~/pyBBB/BBB-GVS-3/blink-BBB-GVS-3/src
python blink-BBB-GVS-3.py

halt
 

Drivers / Example Code

Blink LEDs code

• Blink LEDS on BBB-GVS-3 GPIO lines

I2C Example Code

• MCP23008 Example code
  • Enable the I2C devices on the BeagleBone Black Rev C
  • 2nd method - BeagleBone Black I2C References
• Enable the I2C devices on the BeagleBone Black

Issues

Issues with X2 card

• No known or reported issues

Issues with X1 card

• WP jumper should be WE
• EEPROM A3 s/b high not low
• Cut etch to U1-3
• Add wire U1-3 to U1-8

BBB-GVS-3 Assembly Sheet

• BBB-GVS-3 Rev X2 Assembly Sheet