by modifying the continuous read example I can get adc_continous_read() to return ESP_OK and ESP_ERR_TIMEOUT.
Cannot get ESP_ERR_INVALID_STATE even when I call adc_continous_read() every 2seconds
with a sample frequency of 20Khz (.sample_freq_hz = 20 * 1000).
Reading the documentation I assumed if the task missed data by not calling adc_continous_read() at a suitable frequency ESP_ERR_INVALID_STATE would be returned.
Is there anyway by pooling to detect generated results were lost.
Section of the documentation I am referring to:
If the generated results fill up the internal pool, new generated results will be lost. Next time when the adc_continuous_read() is called, this function will return ESP_ERR_INVALID_STATE indicating this situation.