Search found 15 matches

by Captain.Chode
Thu Jan 04, 2024 5:24 pm
Forum: ESP-IDF
Topic: RMT transmission synchronization to input pin state
Replies: 3
Views: 5533

Re: RMT transmission synchronization to input pin state

EDIT: the following text was a reply for an answer which has been deleted. The user was registered after I opened my topic, and the answer was very ChatGPT-like (it cited the api reference in a slightly modified way) Can you show me an example how to set up detecting a mismatch? The api reference is...
by Captain.Chode
Thu Jan 04, 2024 9:10 am
Forum: ESP-IDF
Topic: RMT transmission synchronization to input pin state
Replies: 3
Views: 5533

RMT transmission synchronization to input pin state

I have a 125 kbit/sec multi-master bus. It takes 8 microseconds to transfer 1 bit. The initial state of the bus is high. In order to transmit a message we need to listen on the bus and if there were no low state on the bus for 16*8 microseconds then we can start transmitting. This might be solved by...
by Captain.Chode
Wed Jun 30, 2021 7:04 pm
Forum: ESP32 Arduino
Topic: ESP32 download tool failes to upload binary
Replies: 1
Views: 3844

Re: ESP32 download tool failes to upload binary

So apparently uploading these files solved the problem:

bootloader.bin @ 0x1000
boot_app0.bin @ 0xe000
partitions2.bin @ 0x8000

After that it is possible to upload just the firmware. Not sure why did it work in the first place though...
image (3).png
image (3).png (41.16 KiB) Viewed 3789 times
by Captain.Chode
Tue Jun 29, 2021 8:24 am
Forum: ESP32 Arduino
Topic: ESP32 download tool failes to upload binary
Replies: 1
Views: 3844

ESP32 download tool failes to upload binary

I have a small project written in platformio with the Arduino framework. I have exported the binary and try to upload it with the ESP flash downloader. The first upload succeeded (to a brand new devmodule), but for the second time (to the same module) failes with the following error: is stub and sen...
by Captain.Chode
Tue Mar 23, 2021 3:25 pm
Forum: ESP32 Arduino
Topic: RMT peripheral clk_div how does it work?
Replies: 4
Views: 6175

Re: RMT peripheral clk_div how does it work?

Yes, I converted the 16-bit returned values to signed integers based on the level property in rmt_item32_t. But that doesn't explain the "weirdness". Which was the fact that with one clk_div setting it was working, but with another one it didn't. A you can see I had negative values both in the worki...
by Captain.Chode
Sat Sep 05, 2020 9:21 am
Forum: ESP-IDF
Topic: Which peripheral to use for bus arbitration? RMT/MCPWM/LEDC/I2S/SPI?
Replies: 0
Views: 2189

Which peripheral to use for bus arbitration? RMT/MCPWM/LEDC/I2S/SPI?

Hi, I am fiddling with a legacy automotive bus called VAN bus with an ESP32. I have successfully created a library using the RMT to read it, however I also would like to implement writing purely from software. To be able to do that bus arbitration logic must be implemented. For this I need to listen...
by Captain.Chode
Tue Apr 28, 2020 2:41 pm
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 443
Views: 939583

Re: What would you like to see in The Next Chip?

CAN is a bit of a... thing. I won't say we have a CAN controller in our chip (because of ...reasons), but I can say that the ESP32-S2 has a peripheral we call the 'TWAI (Two Wire Automotive Interface) controller'; which happens to be fully compatible with the peripheral you used to use for that on ...
by Captain.Chode
Sat Feb 22, 2020 11:24 pm
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 443
Views: 939583

Re: What would you like to see in The Next Chip?

Maybe a second CAN controller, support for MIPI DSI displays, and please keep the RMT peripheral, I just love it, it is very useful.
by Captain.Chode
Mon Feb 17, 2020 7:34 am
Forum: ESP32 Arduino
Topic: RMT peripheral clk_div how does it work?
Replies: 4
Views: 6175

RMT peripheral clk_div how does it work?

Hi, I am trying to create an universal remote using the RMT peripheral based on this code: https://github.com/kimeckert/ESP32-RMT-Rx-raw/blob/master/main/rmt_rx_raw.c . It seems like it is working, however there is one thing that I can't quite get which is the clk_div parameter when initializing the...
by Captain.Chode
Wed Jul 17, 2019 5:02 pm
Forum: ESP-IDF
Topic: Using RMT to decode VAN bus protocol
Replies: 6
Views: 9362

Re: Using RMT to decode protocol

I took a quick look on that protocol, and it seems that it wouldn't be so complicated to write an RMT receiver library for it. Basically the rmt_van_rx_parse_byte method and the crc calculation method should be implemented, and the rest would be almost the same.