10 GPIO (including RTC low power I/O) <gpio>
17 SDMMC Host <sdmmc_host>
18 SD SPI Host <sdspi_host>
19 SDIO Slave <sdio_slave>
20 Sigma-delta Modulation <sigmadelta>
21 SPI Master <spi_master>
24 Touch Sensor <touch_pad>
27 Example code for this API section is provided in :example:`peripherals` directory of ESP-IDF examples.