CAN bus peripheral control.
GPIO and pin configuration
Driver for the Inter-IC Sound (I2S) peripheral(s).
LED Control peripheral (which also creates PWM signals for other purposes)
Remote Control (RMT) module driver.
ESP ROM libraries
SPI peripheral control
Controls UART peripherals (UART0, UART1, UART2).
Notice that UART0 is typically already used for loading firmware and logging.
Therefore use UART1 and UART2 in your application.
Any pin can be used for
Units of measurement implementation for times and frequencies.