uart_sw_flowctrl_t::xon_thrd field
If the software flow control is enabled and the data amount in rxfifo is less than xon_thrd, an xon_char will be sent
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uint8_t xon_thrd;
uart_sw_flowctrl_t::xon_thrd is read by 1 function:
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uart_sw_flowctrl_t::xon_thrd