无法从FTDI串行I2C到Android Eclipse Java应用程序读取字节
我有一个FTDI UMFT201XB(I2C串行USB接口)通过OTG电缆连接到android 4.2平板电脑。FTDI连接到PIC MCU。我已经从FTDI运行了示例TN-147,并且设备被正确识别 我修改了TN-147示例,读取MCU发送到UMFT201XB的12个字节 代码是:无法从FTDI串行I2C到Android Eclipse Java应用程序读取字节,android,i2c,ftdi,d2xx,Android,I2c,Ftdi,D2xx,我有一个FTDI UMFT201XB(I2C串行USB接口)通过OTG电缆连接到android 4.2平板电脑。FTDI连接到PIC MCU。我已经从FTDI运行了示例TN-147,并且设备被正确识别 我修改了TN-147示例,读取MCU发送到UMFT201XB的12个字节 代码是: public void ReNew() { byte [] databuf = new byte[5] ; byte [] databuf1 = new byte[20];
public void ReNew() {
byte [] databuf = new byte[5] ;
byte [] databuf1 = new byte[20];
device_time=0;
databuf1[0]= 0x64;
databuf1[2]= 0x64;
databuf[0]= 0x09;
if(ftdid2xx.createDeviceInfoList(Device_ControlFragmentContext) <= 0)
return;
ftDevice = ftdid2xx.openByIndex(Device_ControlFragmentContext, 0);
if (ftDevice == null) {
Toast.makeText(Device_ControlFragmentContext, "Not supported device",Toast.LENGTH_SHORT).show();
} else {
//ftDevice.setLatencyTimer((byte)240);
ftDevice.purge((byte) (D2xxManager.FT_PURGE_TX | D2xxManager.FT_PURGE_RX));
ftDevice.setBitMode((byte)0x33 , (byte)0x20);
iavailable1 = ftDevice.getQueueStatus();
ftDevice.write(databuf , 1);
ftDevice.restartInTask();
iavailable2 = ftDevice.getQueueStatus();
lenght_ = ftDevice.read(databuf1,iavailable2);
iavailable3 = ftDevice.getQueueStatus();
ftDevice.setBitMode((byte)0x32 , (byte)0x20);
ftDevice.close();
device_time=databuf1[0]+databuf1[1]+databuf1[2]+databuf1[3]+databuf1[4]+databuf1[5]+databuf1[6]+databuf1[7]+databuf1[8]+databuf1[9]+databuf1[10]+databuf1[11]+databuf1[12]+databuf1[13]+databuf1[14]+databuf1[16]+databuf1[17]+databuf1[18]+databuf1[15]+databuf1[19];
DEVICE_TIME.setText(String.valueOf(device_time));
days_view.setText(String.valueOf(iavailable1));
hours_view.setText(String.valueOf(iavailable2));
minutes_view.setText(String.valueOf(iavailable3));
seconds_view.setText(String.valueOf(lenght_));
SYSTEM_TIME.setText(String.valueOf(593));
/////////////////////////////////////////////////////////////////////////////////
}
ftDevice.close();
}
ftDevice.read(databuf1,iavailable2)
没有提取任何字节到databuf1
。可用字节仍然是12(Dec)
(iaavailable3=12
)
请帮忙。我也有类似的问题。尝试将读取部分移动到其他线程。当我将
FT\u设备
传递给AsyncTask
读取字节的doInBackground()
方法时,它对我起到了作用
databuf1[0]= 0x64;
databuf1[2]= 0x64;