On 8/30/22 02:52, Florian Feldbauer via Tech-talk wrote:
Hey all,
for a small side project I'm working with a board featuring an ESP32-WROOM-32E module [1].
The module itself has WiFi and an EMAC core which is connected to an ethernet PHY on the board (10/100Mbps).
Also there are some sensors connected to the module.
With 448 KB ROM and 520 KB RAM, this chip seems a bit small
to run much of a "regular" IOC. You might make it work by
manually striping down to just the CA server and DB core.
fyi. a point of rough comparison for RTEMS/powerpc32
$ size bin/RTEMS-mvme3100/softIoc
text data bss dec hex filename
2426405 567300 212745 3206450 30ed32 bin/RTEMS-mvme3100/softIoc
At the moment I have a small program running on the board, that connects to ethernet, gets it's IP via DHCP and starts listening on a TCP port.
If a message is received the corresponding sensor data is send as an answer.
The chip is running a modified FreeRTOS kernel and I started to wonder, if it would be possible to port EPICS on that module.
I looked into FreeRTOS ~recently for an unrelated project.
It is a very bare bones OS. The main surprise I found is that
there is only an abstraction API covering basic threading
and CPU exception handling. Not I/O devices. So eg. no
common UART API. Certainly no sockets API. Rather, the
various examples I found were using various SoC vendor
libraries directly.
So as it stands now, you would end up with a FreeRTOS+EspressIF
port rather than a generic FreeRTOS port.
Does anyone have experience with the ESP32 and tried running EPICS on it already?
If not, anyone has an idea for a good starting point for such a project?
A CA server that provides the sensor data as PVs would be enough.
A CA server is a complicated/stateful beast by comparison
with most other protocols.
Maybe start with a Modbus TCP server for it?
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/protocols/modbus.html
Cheers,
Florian
[1] https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf
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