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.

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 ...

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.

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 ...

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 ...

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...

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...

Can someone confirm that spi flash driver running on SPI1 never uses DMA?

Thank you.

https://docs.espressif.com/projects/esp ... own-issues

Half duplex mode is not compatible with DMA when both writing and reading phases exist.

What does it mean exactly? When SPI_DOUTDIN in SPI_USER_REG is set to zero this issue occurs?

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...