esp-idf/components
Ivan Grokhotkov 50ef2f97d6 esp_pm: fix garbage on UART when CONFIG_PM_ENABLE=y
`uart_ll_get_txfifo_len` returns the number of bytes available in the
TX FIFO; The condition we need is "FIFO empty", not "FIFO has free
space". `uart_ll_is_tx_idle` does that, and also ensures that the last
character popped from the TX FIFO has been fully transmitted.
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