I was able to implement AMP (Asymmetric Multi-Processing) and get core 1 to run my own bare metal applications. After installing the ISR service to run on core 1, I was able to reduce the interrupt jitter down to 1us.

My PR can be found here. https://github.com/espressif/esp-idf/pull/12800

Any way to enable CONFIG_FREERTOS_UNICORE without it also forcing CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE? That way i can implement my own esp_startup_start_app_other_cores function.

However, I changed it to default to Level 1 interrupt, but the issue still persists, so it is not necessarily a interrupt level issue. Note that level 1 is the level with the *least* priority. Higher levels = higher priority in Xtensa. I'm not surprised this doesn't do anything. Yes i know, i set a...

I did some more digging into the IDF It looks like RTOS is setting up the interrupts without setting the level. Then in esp_intr_alloc_intrstatus, it is being defaulted to ESP_INTR_FLAG_LOWMED which could potentially assign it a level 3 interrupt. However, I changed it to default to Level 1 interrup...

I created an example project with just the interrupt in it, and a blink task. getting between 2-9us so there is still interrupt jitter. Any idea what could be causing this?

https://github.com/FL0WL0W/ESP32InterruptExample

Hi ESP_Sprite, Yes you are correct, i have persistence set to infinite on the scope so i can capture all of the pulses to see the worst case. I've had it running on the bench all day and it looks like worst case is 48us latency, and best case is 2us which has been mentioned in some other posts. Here...

What we are getting at is called Ringing. It occurs when one signal tries to set the value high and another to set it low. Do you have that? Is the other processor setting it high and your code setting it low? It looks like it. No, You can see in the code that the input is on pin 35 (purple), and t...

The circuit is just another microcontroller generating a series of pulses. Pulse width of about 200us. The input is not heavily bouncing. I just have the scope triggering on both rising and falling edges. Here is another picture with the scope only triggering on the rising edge. Same problem. https:...

Hi, I am having trouble with the external interrupt latency being very inconsistent. My code for testing the interrupt is as follows void app_main(void) { gpio_install_isr_service(ESP_INTR_FLAG_LEVEL3 | ESP_INTR_FLAG_IRAM); gpio_set_direction(static_cast<gpio_num_t>(35), GPIO_MODE_INPUT); gpio_set_i...