esp_idf_sys

Constant soc_periph_spi_clk_src_t_SPI_CLK_SRC_DEFAULT

Source 
pub const soc_periph_spi_clk_src_t_SPI_CLK_SRC_DEFAULT: soc_periph_spi_clk_src_t = 4;
Expand description

< Select APB as SPI source clock