Really good idea to send from CAN Tx interrupt, will try that, thanks. I was sending a wake up from the interrupt to a task and getting undesirable latency. Latency massively affects throughput in my application, CAN bus is by far my only bottleneck. If a CAN packet is 0.25ms, I want a response on t...

I have a dramatic performance improvement to share that reduces latency between receiving a frame and transmitting a response from around several milliseconds down to <80us (most of the time <10us which is the resolution with which my Kvaser CAN device can measure). It doesn't do too much in the CAN...

Thanks ESP_Sprite. Very helpful, will investigate along these lines.

Yes I do use floats in the RMT task that normally runs every 5ms.

The RMT task can be starved for at least 400ms depending on frequency.

If one core is writing to flash, can the other core still run normally?

Interesting. Do you also pass parameters to the functions?

ISWYM. Some of my build steps use symbol information from other parts of the build that are in a .map file. Works well as long as you keep the binary and the map file together. Have you found a better or alternative way to automatically populate your function pointer table?

I haven't started with partitions/OTA on ESP32 yet, but do a lot of related tricks on automotive engine control units running Tricore microcontrollers using GNU C and linker scripts with bits of assembly where necessary to bypass, replace or augment existing compiled functions, including calling exi...

Bit more context, in this case with the 5 second delay between esp_wifi_connect and starting task_RMT_Rx: void app_main() { nvs_flash_init(); tcpip_adapter_init(); ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) ); wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); ESP_ERROR_CHECK( esp_w...

I have a task called task_RMT_Rx that regularly flushes an RMT receive buffer that records pulse width hi/lo pairs. Because my hi/lo pairs are continuous, I have to do this as no interrupt can be called. If task_RMT_Rx is not run often enough, the RMT buffer overflows and I have to do a rather clums...

ESP32 is little endian but most vehicles I have dealt with put 16 bit values big endian in CAN frames even if their CPU is little endian. 12 bit is also common for torque values.

Analog Lamb said they could not do 1000 qty and also didn't have FCC/CE testing/markings for 16MB WROOM, I did not ask about WROVER.