Constant esp_idf_sys::soc_periph_uart_clk_src_legacy_t_UART_SCLK_DEFAULT

source ยท 
pub const soc_periph_uart_clk_src_legacy_t_UART_SCLK_DEFAULT: soc_periph_uart_clk_src_legacy_t = 4;
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< UART source clock default choice is APB