int HardwareSerial::availableForWrite(void) { if(!_uart || !uart_tx_enabled(_uart)) { return 0; } return static_cast<int>(uart_tx_free(_uart)); }
irom uint8_t __serial_availableForWrite(uart_t *_uart) { if(!_uart || !uart_tx_enabled(_uart)) { return 0; } return uart_tx_free(_uart); }