Search found 92 matches
- Fri Apr 05, 2019 6:38 pm
- Forum: General Discussion
- Topic: RTOS running on one core only
- Replies: 37
- Views: 59271
Re: RTOS running on one core only
See viewtopic.php?f=12&t=422. Both interrupt handler and FreeRTOS adds some delay. I would suggest using one of high priority interrupts (which can not be serviced in C) but you need to understand Xtensa architecture very well.
- Fri Apr 05, 2019 5:00 pm
- Forum: General Discussion
- Topic: RTOS running on one core only
- Replies: 37
- Views: 59271
Re: RTOS running on one core only
Running the second core without FreeRTOS is not very easy. Basically you need to follow call_start_cpu0() function and do almost everything that is done in #if !CONFIG_FREERTOS_UNICORE directives. You should know that: you will need to care about 3.10 sillicon bug you will not be able to use newlib ...
- Sat Feb 23, 2019 2:07 pm
- Forum: Report Bugs
- Topic: UDP Broadcast Performance is Worse in AP mode than STA Mode
- Replies: 1
- Views: 5867
Re: UDP Broadcast Performance is Worse in AP mode than STA Mode
I am experiencing similar issue viewtopic.php?f=2&t=9322. I have not solved it yet but it seems that ESP always sends all data but they are blocked / dropped / whatever by system. You should try to connect more listening devices at the same time.
- Tue Feb 19, 2019 12:11 pm
- Forum: General Discussion
- Topic: datagram loss reason
- Replies: 0
- Views: 3458
datagram loss reason
Hi, I know that UDP does not guarantee that data will be ever delivered. I am broadcasting 21 bytes long datagram every 1 second but sometimes it is not delivered - usually 1 or 2 datagrams are missing in a row. I am attaching wireshark log. Even more interesting is that I don't see any packet drop ...
- Fri Jan 11, 2019 7:12 pm
- Forum: General Discussion
- Topic: [SPI] how to stop using DMA
- Replies: 8
- Views: 14811
Re: [SPI] how to stop using DMA
Unfortunately I have written driver only for SPI master. As I am no longer working with ESP32 I do not plan to extend it also for SPI slave. There is a hardware bug in SPI DMA https://github.com/espressif/esp-idf/blob/72b3c6d6b8ae3da076680c431ec239a0ff4c23d0/components/driver/spi_common.c#L382-L438 ...
- Thu Dec 13, 2018 5:07 pm
- Forum: General Discussion
- Topic: [SPI] how to stop using DMA
- Replies: 8
- Views: 14811
Re: [SPI] how to stop using DMA
Found the issue, it is not even DMA related. If you set SPI_FASTRD_MODE to 0 and SPI_FREAD_QIO to 1 hardware will still perform QIO transmission. It has been fixed in TRM from 07/12/2018. Also, out of curiosity, is there a reason you're writing your own driver, foregoing the one in esp-idf? In the p...
- Wed Dec 12, 2018 10:37 pm
- Forum: General Discussion
- Topic: [SPI] how to stop using DMA
- Replies: 8
- Views: 14811
[SPI] how to stop using DMA
Hi, let's say that I want to use SPI with DMA channel and then without DMA channel. To use DMA I set channel in DPORT_SPI_DMA_CHAN_SEL_REG register. I set DPORT_SPI3_DMA_CHAN_SEL to either 1 or 2. SPI DMA transmission is successful but how to stop using DMA now? When I set DPORT_SPI3_DMA_CHAN_SEL to...
- Sun Nov 25, 2018 11:11 am
- Forum: ESP-IDF
- Topic: SPI1 flash driver and DMA
- Replies: 1
- Views: 3675
SPI1 flash driver and DMA
Can someone confirm that spi flash driver running on SPI1 never uses DMA?
Thank you.
Thank you.
- Sun Nov 25, 2018 8:43 am
- Forum: Documentation
- Topic: Documentation Requests/Feedback
- Replies: 81
- Views: 233977
Re: Document Requests
https://docs.espressif.com/projects/esp ... own-issues
What does it mean exactly? When SPI_DOUTDIN in SPI_USER_REG is set to zero this issue occurs?Half duplex mode is not compatible with DMA when both writing and reading phases exist.
- Sat Nov 24, 2018 9:47 pm
- Forum: General Discussion
- Topic: Gripes on ESP32/ESP-IDF
- Replies: 51
- Views: 69907
Re: Gripes on ESP32/ESP-IDF
https://github.com/espressif/esp-idf/issues/2738 Now take a look at this issue. It is present in v3.1 release even in master branch at the moment. Because of that assert SPI driver fails whenever trying to use it in DIO/QIO mode. Does it seem like a minor issue to you? This bug exists there over th...