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fix(uart): correct uart_get_tx_buffer_free_size calculation

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Modified a bit on the TX ring buffer push size logic

 Closes https://github.com/espressif/esp-idf/issues/15859
This commit is contained in:
Song Ruo Jing
2025-11-24 11:37:45 +08:00
parent aef9061d93
commit 0d7c665033
3 changed files with 158 additions and 30 deletions
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components/esp_driver_uart/include/driver/uart.h
+3 -1
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@@ -603,7 +603,9 @@ esp_err_t uart_flush_input(uart_port_t uart_num);
esp_err_t uart_get_buffered_data_len(uart_port_t uart_num, size_t* size);
/**
* @brief UART get TX ring buffer free space size
* @brief UART get TX ring buffer free space size for the next data to be enqueued
*
* It returns the tight conservative bound for NOSPLIT ring buffer overall enqueueable payload across up to two chunks.
*
* @param uart_num UART port number, the max port number is (UART_NUM_MAX -1).
* @param size Pointer of size_t to accept the free space size