Design note - CC112x RX Sniff Mode (TBD)

Hi Martin,

We can work with current users guide based today. I just wanted to know if there is existing helpful document.

Thanks for your comment.

Best Regards,

Enok

Enok

Thanks for understanding. Please do not hesitate to post any questions you might have regarding sniff mode. Even though we have not released tha app note yet, we are more than happy to assist if there is any issues.

We would like to confirm the all of registers which should be changed to enable sniff mode. The following registers are enough?
===
0x22(WOR_CFG1)
0x23(WOR_CFG2)
0x24(WOR_EVENT0_MSB)
0x25(WOR_EVENT0_LSB)
0x29(RFEND_CFG1)
0x2A(RFEND_CFG0)
===

Best regards,
Imoto

Hi Imoto

That is correct. In addition you need to use the SWOR strobe instead of SRX strobe to enter WOR mode. If you plan to operate with the RCOSC calibration disabled (WOR_CFG0.RC_MODE < 2) You need to to do a RC calibration before you disable the disabled it. This can be done as follows:

/******************************************************************************
 * @fn          calibrateRcOsc
 *
 * @brief       calibrates the RC Oscillator used for the cc112x wake on radio
 *              functionality.
 *               
 * @param       none
 *
 * @return      none
 */
static void calibrateRCOsc(void)
{
  uint8 writeByte;
  // read current register value
  cc112xSpiReadReg(CC112X_WOR_CFG0,&writeByte,1);
  // mask register bitfields and write new values
  writeByte = (writeByte & 0xF9) | (0x02 << 1);
  //write new register value
  cc112xSpiWriteReg(CC112X_WOR_CFG0,&writeByte,1);
  // strobe idle to calibrate RC osc
  trxSpiCmdStrobe(CC112X_SIDLE);
  //disable RC calibration
  writeByte = (writeByte & 0xF9) | (0x00 << 1);
  cc112xSpiWriteReg(CC112X_WOR_CFG0, & writeByte, 1);
}

For optimum sniff mode register settings I would advice to use the latest version of SmartRF Studio