songruojing f4d33d2739 uart: Add a new API to get the free space size of tx buffer ... Closes https://github.com/espressif/esp-idf/issues/8932 Closes https://github.com/espressif/esp-idf/issues/3078 (cherry picked from commit 9d73475e44)		2022-07-11 17:04:11 +08:00
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driver	uart: Add a new API to get the free space size of tx buffer	2022-07-11 17:04:11 +08:00
esp_private	…