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ESP32: What is the frequency of TWAI_CLK_SRC_DEFAULT?

The frequency of TWAI_CLK_SRC_DEFAULT on the ESP32 is, by default 80 MHz. This is independent of the core frequency (e.g. 160 MHz or 240MHz).

You can verify this by using the esp_clk_tree_src_get_freq_hz function in your code, as shown in the example below:

#include "esp_clk_tree.h"

void app_main(void)
{
    uint32_t clockSourceHz;
    esp_clk_tree_src_get_freq_hz(TWAI_CLK_SRC_DEFAULT, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &clockSourceHz);
    printf("TWAI clock source frequency: %ld Hz\n", clockSourceHz);
}