3 ms·

Great work indeed. Does it support the new ESP32 processors?

aseipp 10y ago
The ESP32 also uses an Xtensa, the LX6, which should have the same basic instruction encoding, etc (and I think they both use FreeRTOS, as well, but I only have an ESP32). Probably shouldn't be too hard. You can also stuff more functionality into it, too.[1] [1] Related: I can't actually even find the documentation on what's precisely changed between the LX6 (ESP32) and the LX106 (ESP8266), other than the basics on the datasheets - I don't know of any documentation on e.g. any different architectural details. Maybe you have to ask Espressif. Or Cadence. Anyone have any idea?
- jakobdabo 10y ago
  Their datasheets only mention the PIN definitions and electrical characteristics of the microcontrollers. Try to get the information from the reference manual[0]. Also there are these books[1][2] by Neil Kolban. [0] https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf https://www.espressif.com/sites/default/files/documentation/... [1] https://leanpub.com/ESP8266_ESP32 https://leanpub.com/ESP8266_ESP32 [2] https://leanpub.com/kolban-ESP32 https://leanpub.com/kolban-ESP32 edit: More information about the differences: http://www.cnx-software.com/2016/03/25/esp8266-and-esp32-differences-in-one-single-table/ http://www.cnx-software.com/2016/03/25/esp8266-and-esp32-dif...
  - aseipp 10y ago
    The ESP32 datasheet is really woefully inadequate for this part; it mostly describes the chip, but I guess what I'm really looking for is things like "A description of the ISA itself", i.e. the "LX6 datasheet", so to speak. So I want something like the the actual instruction encoding, instruction listing, etc for the LX6 series and what it supports precisely.
- MrBuddyCasino 10y ago
  Most importantly, the ESP32 has register windows.
  - aseipp 10y ago
    Right, this is the kind of information I was looking for (maybe some actual ISA documentation; the instruction encoding method itself, etc). But for this specific point -- I thought all of the Xtensa series used register windows? Or did they both have them but the ESP8266 never actually use them (somehow?)
    - MrBuddyCasino 10y ago
      The xtensa series is highly configurable, afaik the ESP8266 doesn't have them in hardware. This is second hand knowledge though.

The ESP32 also uses an Xtensa, the LX6, which should have the same basic instruction encoding, etc (and I think they both use FreeRTOS, as well, but I only have an ESP32). Probably shouldn't be too hard. You can also stuff more functionality into it, too.[1] [1] Related: I can't actually even find the documentation on what's precisely changed between the LX6 (ESP32) and the LX106 (ESP8266), other than the basics on the datasheets - I don't know of any documentation on e.g. any different architectural details. Maybe you have to ask Espressif. Or Cadence. Anyone have any idea?

jakobdabo 10y ago
Their datasheets only mention the PIN definitions and electrical characteristics of the microcontrollers. Try to get the information from the reference manual[0]. Also there are these books[1][2] by Neil Kolban. [0] https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf https://www.espressif.com/sites/default/files/documentation/... [1] https://leanpub.com/ESP8266_ESP32 https://leanpub.com/ESP8266_ESP32 [2] https://leanpub.com/kolban-ESP32 https://leanpub.com/kolban-ESP32 edit: More information about the differences: http://www.cnx-software.com/2016/03/25/esp8266-and-esp32-differences-in-one-single-table/ http://www.cnx-software.com/2016/03/25/esp8266-and-esp32-dif...
- aseipp 10y ago
  The ESP32 datasheet is really woefully inadequate for this part; it mostly describes the chip, but I guess what I'm really looking for is things like "A description of the ISA itself", i.e. the "LX6 datasheet", so to speak. So I want something like the the actual instruction encoding, instruction listing, etc for the LX6 series and what it supports precisely.
MrBuddyCasino 10y ago
Most importantly, the ESP32 has register windows.
- aseipp 10y ago
  Right, this is the kind of information I was looking for (maybe some actual ISA documentation; the instruction encoding method itself, etc). But for this specific point -- I thought all of the Xtensa series used register windows? Or did they both have them but the ESP8266 never actually use them (somehow?)
  - MrBuddyCasino 10y ago
    The xtensa series is highly configurable, afaik the ESP8266 doesn't have them in hardware. This is second hand knowledge though.