今天我們把CDC serial driver 中的 setParameters 修改如下：

        @Override
        public void setParameters(int baudRate, int dataBits, int stopBits, int parity) throws IOException {
            byte stopBitsByte;
            switch (stopBits) {
                case STOPBITS_1: stopBitsByte = 0; break;
                case STOPBITS_1_5: stopBitsByte = 1; break;
                case STOPBITS_2: stopBitsByte = 2; break;
                default: throw new IllegalArgumentException("Bad value for stopBits: " + stopBits);
            }

            byte parityBitesByte;
            switch (parity) {
                case PARITY_NONE: parityBitesByte = 0; break;
                case PARITY_ODD: parityBitesByte = 1; break;
                case PARITY_EVEN: parityBitesByte = 2; break;
                case PARITY_MARK: parityBitesByte = 3; break;
                case PARITY_SPACE: parityBitesByte = 4; break;
                default: throw new IllegalArgumentException("Bad value for parity: " + parity);
            }
            // byte[] baudRate = le32_to_cpu( baudRate );  
            // little endian binary (32bit) formate
            byte[] msg = {
                    (byte) ( baudRate & 0xff),
                    (byte) ((baudRate >> 8 ) & 0xff),
                    (byte) ((baudRate >> 16) & 0xff),
                    (byte) ((baudRate >> 24) & 0xff),
                    stopBitsByte,
                    parityBitesByte,
                    (byte) dataBits};
            
            /* Fix Arduino Frimata protocol connect , need setDTR msg before set parameters control msgs.
             對應昨天看到的 acm_set_control(acm, acm->ctrlout = newctrl); 這行指令
             ref :
             	http://lxr.free-electrons.com/ident?i=acm_tty_set_termios 
             	http://lxr.free-electrons.com/source/drivers/usb/class/cdc-acm.c#L989
             */
            
            setDTR(true); 
            
            sendAcmControlMessage(SET_LINE_CODING, 0, msg);
        }

重新打包封裝 APP 後，push 到 zenfone 6 上面測試....

燈！燈！燈！ 可以收到由 arduino 送出來的資料了，有圖為證：

Android Serial Driver 專案放在這邊： https://github.com/jyyan/usb-serial-for-android

我們明天見 :P