Re: ADIS16209 SPI Interface

Sorry NevadaMark, I meant to say that the code I have written (as in the above post) works correctly (or at least it returns the values I expect from the datasheet). I did not expect it to be correct based on the information in the datasheet, from the datasheet I expected to do this:

uint16_t readRegister(uint8_t address) {

uint16_t res;

// PULL CS LOW HERE

res = (spi_read(address) << 8);

res = res | spi_read(0x00);

// PULL CS HIGH HERE

// Wait for Stall Time

return res;

}

But this does not work. Also, the example code for the ADIS16210 does not seem to return the correct values:

short int read_reg(unsigned char address) {

  short int data;

  short int hi_byte, lo_byte;

  GP2DAT &= ~0x00010000;            // lower !CS pin

  // send address (1st two bytes)

  spi_rw(address);

  spi_rw(0x00);

  delay_us(45);  // stall time is 40us on adis16210 with normal mode

  // send dummy bytes for data

  hi_byte = spi_rw(0x00);

  lo_byte = spi_rw(0x00);

  GP2DAT |= 0x00010000;             // raise !CS pin

  data = (hi_byte << 8) + lo_byte;

  delay_us(45);  // stall time is 40us on adis16210 with normal mode

  // return data read from device at 'address'

  return data;

}

I did wait for initialisation after reset but thank you for pointing that out.