Function esp_idf_svc::hal::sys::uart_get_tx_buffer_free_size

source ยท 
pub unsafe extern "C" fn uart_get_tx_buffer_free_size(
    uart_num: u32,
    size: *mut usize,
) -> i32
Expand description

@brief UART get TX ring buffer free space size

@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

@return - ESP_OK Success - ESP_ERR_INVALID_ARG Parameter error