NanoPi2 Android Spi has problem.

Hi all,

I am recently playing with NanoPi2 running Android (default image provided
by manufacturer).
I used the matrix lib
( do stuff, and I get
stuck at Spi library. I followed the demo
and do exactly the steps to initialize, write and read bytes from
"/dev/spidev0.0". But I got nothing sent. I also connected
19-SPI0_MOSI/GPIOC31, 21-SPI0_MISO/GPIOD0, 23-SPI0_CLK/GPIOC29 pins to
oscilloscope to observe the signal, but nothing out,those pins keep silent.

I also did some debugs on the software by printf out the spi function
parameters, and for "ioctl", it seem to be working not properly. 
For example:
I ran the this function.

EXPORT int setSPIDataMode(int spi_fd, int mode)
  int ret;
  int spi_mode = 0;

  switch(mode) {
    case SPI_MODE0:
      spi_mode &= ~(SPI_CPHA|SPI_CPOL);
    case SPI_MODE1:
      spi_mode &= ~(SPI_CPOL);
      spi_mode |= (SPI_CPHA);
    case SPI_MODE2:
      spi_mode |= (SPI_CPOL);
      spi_mode &= ~(SPI_CPHA);
    case SPI_MODE3:
      spi_mode |= (SPI_CPHA|SPI_CPOL);
      setLastError("error SPIDataMode");
      return -1;

  ret = ioctl(spi_fd, SPI_IOC_WR_MODE, &mode);
  if (ret < 0) {
    LOGI("Can't ioctl SPI_IOC_WR_MODE");
    return ret;
  LOGI("Successfully ioctl SPI_IOC_WR_MODE: %d", SPI_IOC_WR_MODE);
  ret = ioctl(spi_fd, SPI_IOC_RD_MODE, &mode);
  if (ret < 0) {
    LOGI("Can't ioctl SPI_IOC_RD_MODE");
    return ret;
  LOGI("Successfully ioctl SPI_IOC_RD_MODE: %d", SPI_IOC_RD_MODE);
  return ret;


Successfully ioctl SPI_IOC_WR_MODE: 1073834753
Successfully ioctl SPI_IOC_RD_MODE: -2147390719

It seems that the second argument of "ioctl" is not correct.

Please give me some advises and solutions !
Thank you in advance !

     The content of the link is suporrts the debian system nor for android
of nanopi 2 ,  but nanopi2 has spi driver , you can used directly , but you
had better to check whether the kernel config already configured the SPI ,
if not ,you can configure compile to use it again .