Hewball.com.au

given that a straight GPS cape for Beaglebone didnt exist, the only thing to do is to make one with the help of “Wrea”, thanks for that 😀

Based off the Protocape with eeprom from logicsupply.com

making use of the Ublox Max-7Q GPS

Uses Uart4 for serial lines which breakout to pins P9.11 and P9.13

and For Pulse Per Second output from the GPS for NTP it uses pin P8.8 also known as gpio2_3

has jumper for Active GPS antenna power and also a connector for Dallas 1 Wire devices

Device Tree Overlay

BBB-WACAN-GPS-00A0

Found this Saving for later!!! http://hipstercircuits.com/enable-serialuarttty-on-beaglebone-black/

Finding the numbers for muxing pins
I have yet to find a good explanation for the pin mux hex numbers. I discovered I had actually written it up myself in a previous post, but I’ll repeat it here for convenience.

In the above example you have the following:

0x070 0x26  /* P9_11 = GPIO0_30 = GPMC_WAIT0 , MODE6 */

The first number is the offset from the first pin (conf_gpmc_ad0). The second number is the mode and direction etc. Cameon has an explenation of the second number. Reprinted here for convenience:

• Bit 5: 1 – Input, 0 – Output
• Bit 4: 1 – Pull up, 0 – Pull down
• Bit 3: 1 – Pull disabled, 0 – Pull enabled
• Bit 2 \
• Bit 1   |- Mode
• Bit 0 /

The following is a list of the first numbers for all the pins that have been broken out on the Beaglebone.

So if you want to mux pin 6 from the P8 header to mode 7 (GPIO) and output, you say:

0x0C 0×07 /* P8_6 = GPIO1_3 -> Mode7, output. */

Here is a table of all the pins that are broken out with their corresponding numbers and names: