STM32411 (Blackpill) and RS485

[rvalotta]

Just got a VFD and wanted to know if i could use a RS385 module (http://www.yourduino.com/sunshop/index.php?l=product_detail&p=323#:~:text=This%20module%20interfaces%20an%20Arduino,the%20same%20RS%2D485%20wiring.) to convert the TTL to rs485? Where would I connect the RE and DE? I know tx and rx are DI and RI.

[terjeio]

You can use it provided that support for the direction signal is added to the driver. The easiest way would be to let the modbus plugin claim the highest numbered auxillary output (if available) on init, a bit more involved would be to add it to the driver.c code.
Easier still is to get a module that has auto direction support...

Where would I connect the RE and DE?

Short them together and connect to the direction signal pin.

Note that this repo is no longer updated, the active one is here.

[rvalotta]

Thanks I'm aware the repo is at the other location but the discussion board is over here (at least I don't see a link at the top of the current repo)

[dresco]

@rvalotta

Fwiw, I'm using ones like these - https://www.aliexpress.com/item/32896018384.html
Dirt cheap from multiple sellers & work fine from a 3.3v supply.

[rvalotta]

Okay so I've setup the VFD and gotten it working. Now I'm working on compiling VFD support into GRBL Hal and have some questions

When defining SPINDLE_HUANYANG, What is the difference between 1 and 2
Do I also need to include MODBUS?

Can I comment out and reclaim by Spindle En/dir/pwm pins?

For shits and giggle I tried compiling it with SPINDLE_HUANYANG 2 and MODBUS_ENABLE 1 and am getting the following errors:

Src\driver.c: In function 'selectStream':
Src\driver.c:384:19: error: 'io_stream_t {aka struct }' has no member named 'disable_rx'; did you mean 'disable'?
if(hal.stream.disable_rx)
^~~~~~~~~~
disable
Src\driver.c:385:20: error: 'io_stream_t {aka struct }' has no member named 'disable_rx'; did you mean 'disable'?
hal.stream.disable_rx(false);
^~~~~~~~~~
disable
Src\driver.c: In function 'driver_init':
Src\driver.c:1956:5: error: too few arguments to function 'huanyang_init'
huanyang_init();
^~~~~~~~~~~~~
In file included from Inc/driver.h:267:0,
from Src\driver.c:28:
./spindle/huanyang.h:42:6: note: declared here
void huanyang_init (modbus_stream_t *stream);
^~~~~~~~~~~~~
*** [.pio\build\black_pill_411\src\driver.o] Error 1
Src\serial.c: In function 'serialInit':
Src\serial.c:217:10: error: 'io_stream_t {aka const struct }' has no member named 'disable_rx'; did you mean 'disable'?
.disable_rx = serialDisable,
^~~~~~~~~~
disable
Src\serial.c:217:23: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
.disable_rx = serialDisable,
^~~~~~~~~~~~~
Src\serial.c:217:23: note: (near initialization for 'stream.write_n')
Src\serial.c: In function 'serial2Init':
Src\serial.c:495:10: error: 'io_stream_t {aka const struct }' has no member named 'disable_rx'; did you mean 'disable'?
.disable_rx = serial2Disable,
^~~~~~~~~~
disable
Src\serial.c:495:23: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
.disable_rx = serial2Disable,
^~~~~~~~~~~~~~
Src\serial.c:495:23: note: (near initialization for 'stream.write_n')
*** [.pio\build\black_pill_411\src\serial.o] Error 1

Guessing that there are a few things that need updating. Is there a working driver that I can look at to reference what needs changing?

Thanks in advance.

[terjeio]

When defining SPINDLE_HUANYANG, What is the difference between 1 and 2

The protocol version, 1 is not following Modbus conventions, 2 is. I do not know model numbers vs. protocol version, can be found in the VFD driver documentation?

Do I also need to include MODBUS?

No, it is done automatically.

Can I comment out and reclaim by Spindle En/dir/pwm pins?

Yes.

For shits and giggle I tried compiling it with SPINDLE_HUANYANG 2 and MODBUS_ENABLE 1 and am getting the following errors:

You have to download the submodules along with the driver code when updating.

Is there a working driver that I can look at to reference what needs changing?

The current driver should work when the submodules are in sync with the driver.

[rvalotta]

DOH forgot the --recurse-submodules... Your right its compiling now.

How do i find out what pins its using for modbus. I think its Serial.h where its setting the RX and TX pins but i'm not sure

[terjeio]

Currently via checking the source. Not good I know, I plan to add non GPIO pins to the $pins report.
For the 411 Blackpill it is PA2 and PA3.

[rvalotta]

Thankyou I appreciate that. Could you tell me which file the above is defined in. Its more for me to learn where things are...

[terjeio]

In serial.c - pins are assigned based on IS_NUCLEO_DEVKIT and SERIAL2_MOD symbols defined elsewhere. Search with CTRL+H to find them.

[dresco]

When defining SPINDLE_HUANYANG, What is the difference between 1 and 2

The protocol version, 1 is not following Modbus conventions, 2 is. I do not know model numbers vs. protocol version, can be found in the VFD driver documentation?

As far as I know, all the HY series are v1 protocol, and the GT series (newer, with vector control) are v2 protocol..