Discussion:
eQEP Pins on CRAMPS board
(too old to reply)
Sag ich Dir nich
2016-09-25 15:33:20 UTC
Permalink
Hi,

does anybody know where on the CRAMPS board the eQEP0A_in (P9.92) and
eQEP0B_in (P9.27) pins are? (i mean the physical pins) I need them for an
Encoder for Spindle control
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Charles Steinkuehler
2016-09-25 16:34:58 UTC
Permalink
Hi,
does anybody know where on the CRAMPS board the eQEP0A_in (P9.92) and eQEP0B_in
(P9.27) pins are? (i mean the physical pins) I need them for an Encoder for
Spindle control
Schematics are online:
https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true

eQEP0A_in (P9.92):
SPLCS1 on the CRAMPS board, which is available on P303 pin 4 (with no
input protection, so make sure your signal is 3.3V or less).

eQEP0B_in (P9.27):
FET3 on the CRAMPS board. This goes to the '244 buffer driving the
FETs, so you will need to wire directly to the P9 header. Again, make
sure the signal is 3.3V or less, and do *NOT* use the FET3 output (E1
heater) when running the encoder. You might even want to remove the
FET from the board.
--
Charles Steinkuehler
***@steinkuehler.net
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Sag ich Dir nich
2016-09-25 17:16:36 UTC
Permalink
thanks
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Hi,
does anybody know where on the CRAMPS board the eQEP0A_in (P9.92) and
eQEP0B_in
Post by Sag ich Dir nich
(P9.27) pins are? (i mean the physical pins) I need them for an Encoder
for
Post by Sag ich Dir nich
Spindle control
https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true
SPLCS1 on the CRAMPS board, which is available on P303 pin 4 (with no
input protection, so make sure your signal is 3.3V or less).
FET3 on the CRAMPS board. This goes to the '244 buffer driving the
FETs, so you will need to wire directly to the P9 header. Again, make
sure the signal is 3.3V or less, and do *NOT* use the FET3 output (E1
heater) when running the encoder. You might even want to remove the
FET from the board.
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Sag ich Dir nich
2016-09-27 23:37:45 UTC
Permalink
can i use a normal resistor to get 3.3v out of 5v or do i have to use a
step down voltage regulator, that outputs 3.3v and works with 4v? (when it
is a constant voltage of 5v, i could use a regulator but i dont know what
to use for signal because it is a frequency, not a constant) in case of a
regulator, i would use this
one: http://www.exp-tech.de/pololu-3-3v-2-6a-step-down-voltage-regulator-d24v22f3
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Hi,
does anybody know where on the CRAMPS board the eQEP0A_in (P9.92) and
eQEP0B_in
Post by Sag ich Dir nich
(P9.27) pins are? (i mean the physical pins) I need them for an Encoder
for
Post by Sag ich Dir nich
Spindle control
https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true
SPLCS1 on the CRAMPS board, which is available on P303 pin 4 (with no
input protection, so make sure your signal is 3.3V or less).
FET3 on the CRAMPS board. This goes to the '244 buffer driving the
FETs, so you will need to wire directly to the P9 header. Again, make
sure the signal is 3.3V or less, and do *NOT* use the FET3 output (E1
heater) when running the encoder. You might even want to remove the
FET from the board.
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Charles Steinkuehler
2016-09-28 00:01:08 UTC
Permalink
Why do you need a 3.3V regulator? The BBB supplies 3.3V which
probably has enough current capacity to drive whatever I/O circuits
you need to hook up.

If you are referring to the eQEP0 inputs signals, if your encoder
provides 5V signals (likely) you just need to make sure they never go
above 3.3V. There are various ways to do this using FETs, level
translator ICs, and many other solutions.

If you do not need all the limit switch and SPI expansion signals on
the CRAMPS board, the easiest thing to do might be to use the existing
protection chip and wire the "clean" version of the input signals to
more than one BeagleBone I/O pin. For instance, you could use the
Z-Min and Z-Max inputs (on P502) for your encoder inputs, then connect:

P9.11 (Z-Max) to P9.92 (eQEP0A_in)
P9.13 (Z-Min) to P9.27 (eQEP0B_in)

Make sure that P9.11 and P9.13 are setup as inputs, and set P9.92 and
P9.27 to eqep inputs, and you should be good.
can i use a normal resistor to get 3.3v out of 5v or do i have to use a step
down voltage regulator, that outputs 3.3v and works with 4v? (when it is a
constant voltage of 5v, i could use a regulator but i dont know what to use for
signal because it is a frequency, not a constant) in case of a regulator, i
would use this
one: http://www.exp-tech.de/pololu-3-3v-2-6a-step-down-voltage-regulator-d24v22f3
Post by Sag ich Dir nich
Hi,
does anybody know where on the CRAMPS board the eQEP0A_in (P9.92) and
eQEP0B_in
Post by Sag ich Dir nich
(P9.27) pins are? (i mean the physical pins) I need them for an Encoder for
Spindle control
https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true
<https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true>
SPLCS1 on the CRAMPS board, which is available on P303 pin 4 (with no
input protection, so make sure your signal is 3.3V or less).
FET3 on the CRAMPS board. This goes to the '244 buffer driving the
FETs, so you will need to wire directly to the P9 header. Again, make
sure the signal is 3.3V or less, and do *NOT* use the FET3 output (E1
heater) when running the encoder. You might even want to remove the
FET from the board.
--
Charles Steinkuehler
--
https://github.com/machinekit
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Sag ich Dir nich
2016-10-04 15:29:48 UTC
Permalink
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder inputs A
and B. If i read correctly, those are pins P9.31 for SCK and P9.30 for MOSI.
I set them to input like so: config-pin 931 input
config-pin 930 input

but how do i connect those pins to p9.92 and P9.27?

do i need to make sure the voltage donÂŽt go above 3.3v? Because it says
SCK-5V and MOSI-5V
Post by Charles Steinkuehler
Why do you need a 3.3V regulator? The BBB supplies 3.3V which
probably has enough current capacity to drive whatever I/O circuits
you need to hook up.
If you are referring to the eQEP0 inputs signals, if your encoder
provides 5V signals (likely) you just need to make sure they never go
above 3.3V. There are various ways to do this using FETs, level
translator ICs, and many other solutions.
If you do not need all the limit switch and SPI expansion signals on
the CRAMPS board, the easiest thing to do might be to use the existing
protection chip and wire the "clean" version of the input signals to
more than one BeagleBone I/O pin. For instance, you could use the
P9.11 (Z-Max) to P9.92 (eQEP0A_in)
P9.13 (Z-Min) to P9.27 (eQEP0B_in)
Make sure that P9.11 and P9.13 are setup as inputs, and set P9.92 and
P9.27 to eqep inputs, and you should be good.
Post by Sag ich Dir nich
can i use a normal resistor to get 3.3v out of 5v or do i have to use a
step
Post by Sag ich Dir nich
down voltage regulator, that outputs 3.3v and works with 4v? (when it is
a
Post by Sag ich Dir nich
constant voltage of 5v, i could use a regulator but i dont know what to
use for
Post by Sag ich Dir nich
signal because it is a frequency, not a constant) in case of a
regulator, i
Post by Sag ich Dir nich
would use this
http://www.exp-tech.de/pololu-3-3v-2-6a-step-down-voltage-regulator-d24v22f3
Post by Sag ich Dir nich
Am Sonntag, 25. September 2016 18:35:05 UTC+2 schrieb Charles
Post by Sag ich Dir nich
Hi,
does anybody know where on the CRAMPS board the eQEP0A_in (P9.92)
and
Post by Sag ich Dir nich
eQEP0B_in
Post by Sag ich Dir nich
(P9.27) pins are? (i mean the physical pins) I need them for an
Encoder for
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Spindle control
https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true
Post by Sag ich Dir nich
<
https://github.com/cdsteinkuehler/bobc_hardware/blob/CRAMPS-v2.2.1/CRAMPS/CRAMPS.pdf?raw=true>
Post by Sag ich Dir nich
SPLCS1 on the CRAMPS board, which is available on P303 pin 4 (with
no
Post by Sag ich Dir nich
input protection, so make sure your signal is 3.3V or less).
FET3 on the CRAMPS board. This goes to the '244 buffer driving the
FETs, so you will need to wire directly to the P9 header. Again,
make
Post by Sag ich Dir nich
sure the signal is 3.3V or less, and do *NOT* use the FET3 output
(E1
Post by Sag ich Dir nich
heater) when running the encoder. You might even want to remove the
FET from the board.
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io
https://github.com/machinekit
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Post by Sag ich Dir nich
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Post by Sag ich Dir nich
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Charles Steinkuehler
2016-10-04 16:18:43 UTC
Permalink
Post by Sag ich Dir nich
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder inputs A
and B. If i read correctly, those are pins P9.31 for SCK and P9.30 for MOSI.
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
You will have to physically connect the pins on the BBB (or CRAMPS) P9
header:

Connect P9.42 to P9.30
Connect P9.27 to P9.31

Once you do this, make sure you NEVER set more than one of the pins
wired together to be an output.
Post by Sag ich Dir nich
do i need to make sure the voltage don´t go above 3.3v? Because it says
SCK-5V and MOSI-5V
If you connect the pins on the header-side, and hook your encoder
signals to the P503 pins, you can make use of the protection chip on the
CRAMPS board and you can have 5V encoder signals.
--
Charles Steinkuehler
***@steinkuehler.net
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Sag ich Dir nich
2016-10-04 19:28:17 UTC
Permalink
is it possible to just wire the encoder (5v) to P503 and set pins 931 and
930 to qep?
Post by Sag ich Dir nich
Post by Sag ich Dir nich
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder
inputs A
Post by Sag ich Dir nich
and B. If i read correctly, those are pins P9.31 for SCK and P9.30 for
MOSI.
Post by Sag ich Dir nich
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
You will have to physically connect the pins on the BBB (or CRAMPS) P9
Connect P9.42 to P9.30
Connect P9.27 to P9.31
Once you do this, make sure you NEVER set more than one of the pins
wired together to be an output.
Post by Sag ich Dir nich
do i need to make sure the voltage donÂŽt go above 3.3v? Because it says
SCK-5V and MOSI-5V
If you connect the pins on the header-side, and hook your encoder
signals to the P503 pins, you can make use of the protection chip on the
CRAMPS board and you can have 5V encoder signals.
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Charles Steinkuehler
2016-10-04 19:55:40 UTC
Permalink
No. The eQEP pins are only available on a few specific pins of the CPU.

Refer to the pinmux spreadsheet I referenced earlier:

https://github.com/cdsteinkuehler/beaglebone-black-pinmux/blob/hal_pru_generic/pinmux.ods

You *HAVE* to use the pins that have the eQEP*A and eQEP*B (where * is a
number from 0 to 2) available as a pinmux option.
Post by Sag ich Dir nich
is it possible to just wire the encoder (5v) to P503 and set pins 931 and
930 to qep?
Post by Sag ich Dir nich
Post by Sag ich Dir nich
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder
inputs A
Post by Sag ich Dir nich
and B. If i read correctly, those are pins P9.31 for SCK and P9.30 for
MOSI.
Post by Sag ich Dir nich
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
You will have to physically connect the pins on the BBB (or CRAMPS) P9
Connect P9.42 to P9.30
Connect P9.27 to P9.31
Once you do this, make sure you NEVER set more than one of the pins
wired together to be an output.
Post by Sag ich Dir nich
do i need to make sure the voltage don´t go above 3.3v? Because it says
SCK-5V and MOSI-5V
If you connect the pins on the header-side, and hook your encoder
signals to the P503 pins, you can make use of the protection chip on the
CRAMPS board and you can have 5V encoder signals.
--
Charles Steinkuehler
--
Charles Steinkuehler
***@steinkuehler.net
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Sag ich Dir nich
2016-10-04 20:09:24 UTC
Permalink
okay thanks
Post by Charles Steinkuehler
No. The eQEP pins are only available on a few specific pins of the CPU.
https://github.com/cdsteinkuehler/beaglebone-black-pinmux/blob/hal_pru_generic/pinmux.ods
You *HAVE* to use the pins that have the eQEP*A and eQEP*B (where * is a
number from 0 to 2) available as a pinmux option.
Post by Sag ich Dir nich
is it possible to just wire the encoder (5v) to P503 and set pins 931
and
Post by Sag ich Dir nich
930 to qep?
Am Dienstag, 4. Oktober 2016 18:18:48 UTC+2 schrieb Charles
Post by Sag ich Dir nich
Post by Sag ich Dir nich
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder
inputs A
Post by Sag ich Dir nich
and B. If i read correctly, those are pins P9.31 for SCK and P9.30 for
MOSI.
Post by Sag ich Dir nich
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
You will have to physically connect the pins on the BBB (or CRAMPS) P9
Connect P9.42 to P9.30
Connect P9.27 to P9.31
Once you do this, make sure you NEVER set more than one of the pins
wired together to be an output.
Post by Sag ich Dir nich
do i need to make sure the voltage donÂŽt go above 3.3v? Because it
says
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Post by Sag ich Dir nich
SCK-5V and MOSI-5V
If you connect the pins on the header-side, and hook your encoder
signals to the P503 pins, you can make use of the protection chip on
the
Post by Sag ich Dir nich
Post by Sag ich Dir nich
CRAMPS board and you can have 5V encoder signals.
--
Charles Steinkuehler
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Sag ich Dir nich
2016-10-05 18:21:17 UTC
Permalink
yesterday i set the pins to input and qep and this day i wanted to make
sure i have done everything right by checking the pin modes and what do i
get?

***@beaglebone:~$ config-pin -q 930
p9_30 pinmux file not found!
cape universala overlay not found
run "config-pin overlay cape-universala" to load the cape
***@beaglebone:~$ config-pin overlay cape-universala
loading cape-universala overlay
bash: line 0: echo: write error: no such file or directory
error loading device tree overlay file: cape-universala
***@beaglebone:~$

also the same with: config-pin 930 input

so i flashed the backup onto the restored sd card and got the same
Post by Sag ich Dir nich
okay thanks
Post by Charles Steinkuehler
No. The eQEP pins are only available on a few specific pins of the CPU.
https://github.com/cdsteinkuehler/beaglebone-black-pinmux/blob/hal_pru_generic/pinmux.ods
You *HAVE* to use the pins that have the eQEP*A and eQEP*B (where * is a
number from 0 to 2) available as a pinmux option.
Post by Sag ich Dir nich
is it possible to just wire the encoder (5v) to P503 and set pins 931
and
Post by Sag ich Dir nich
930 to qep?
Am Dienstag, 4. Oktober 2016 18:18:48 UTC+2 schrieb Charles
Post by Sag ich Dir nich
Post by Sag ich Dir nich
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder
inputs A
Post by Sag ich Dir nich
and B. If i read correctly, those are pins P9.31 for SCK and P9.30
for
Post by Sag ich Dir nich
Post by Sag ich Dir nich
MOSI.
Post by Sag ich Dir nich
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
You will have to physically connect the pins on the BBB (or CRAMPS) P9
Connect P9.42 to P9.30
Connect P9.27 to P9.31
Once you do this, make sure you NEVER set more than one of the pins
wired together to be an output.
Post by Sag ich Dir nich
do i need to make sure the voltage donÂŽt go above 3.3v? Because it
says
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Post by Sag ich Dir nich
SCK-5V and MOSI-5V
If you connect the pins on the header-side, and hook your encoder
signals to the P503 pins, you can make use of the protection chip on
the
Post by Sag ich Dir nich
Post by Sag ich Dir nich
CRAMPS board and you can have 5V encoder signals.
--
Charles Steinkuehler
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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Sag ich Dir nich
2016-10-07 15:29:13 UTC
Permalink
okay today i got the new sd card and flashed the same image on it and not i
can assign the pins again with no error.

so i am going to wire it up and see if it works. (solder it on the back
side of the beaglebone if i understood correctly)

is the pinmux saved on the sd card or on the beaglebone?
Post by Sag ich Dir nich
yesterday i set the pins to input and qep and this day i wanted to make
sure i have done everything right by checking the pin modes and what do i
get?
p9_30 pinmux file not found!
cape universala overlay not found
run "config-pin overlay cape-universala" to load the cape
loading cape-universala overlay
bash: line 0: echo: write error: no such file or directory
error loading device tree overlay file: cape-universala
also the same with: config-pin 930 input
so i flashed the backup onto the restored sd card and got the same
Post by Sag ich Dir nich
okay thanks
Post by Charles Steinkuehler
No. The eQEP pins are only available on a few specific pins of the CPU.
https://github.com/cdsteinkuehler/beaglebone-black-pinmux/blob/hal_pru_generic/pinmux.ods
You *HAVE* to use the pins that have the eQEP*A and eQEP*B (where * is a
number from 0 to 2) available as a pinmux option.
Post by Sag ich Dir nich
is it possible to just wire the encoder (5v) to P503 and set pins 931
and
Post by Sag ich Dir nich
930 to qep?
Am Dienstag, 4. Oktober 2016 18:18:48 UTC+2 schrieb Charles
Post by Sag ich Dir nich
Post by Sag ich Dir nich
so i want to use pin 4 (SCK) and 6 (MOSI) of P503 for eQEP encoder
inputs A
Post by Sag ich Dir nich
and B. If i read correctly, those are pins P9.31 for SCK and P9.30
for
Post by Sag ich Dir nich
Post by Sag ich Dir nich
MOSI.
Post by Sag ich Dir nich
I set them to input like so: config-pin 931 input
config-pin 930 input
but how do i connect those pins to p9.92 and P9.27?
You will have to physically connect the pins on the BBB (or CRAMPS)
P9
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Connect P9.42 to P9.30
Connect P9.27 to P9.31
Once you do this, make sure you NEVER set more than one of the pins
wired together to be an output.
Post by Sag ich Dir nich
do i need to make sure the voltage donÂŽt go above 3.3v? Because it
says
Post by Sag ich Dir nich
Post by Sag ich Dir nich
Post by Sag ich Dir nich
SCK-5V and MOSI-5V
If you connect the pins on the header-side, and hook your encoder
signals to the P503 pins, you can make use of the protection chip on
the
Post by Sag ich Dir nich
Post by Sag ich Dir nich
CRAMPS board and you can have 5V encoder signals.
--
Charles Steinkuehler
--
Charles Steinkuehler
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit
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