ADF4350 no-OS driver example project

Hi,

Have a look here: no-OS/ad9739a_fmc_ebz.c at master · analogdevicesinc/no-OS (github.com)

AD9739A-EBZ is one the boards where we use the ADF4350.

Thanks,
Dragos

Thanks Dragos,

Could you explain why the frequency register calculations are different in this driver than in the ADF435X Software?

Steve

Hi Steve,

I don't know how the ADF435X Software's internal code looks like, but did you experience any issues with the no-OS driver?

Thanks,
Dragos

Hi Dragos,

I modified adf4350_set_freq in two places: 

1. to implement rounding, I added “(.5+(float)” in 2 places:

  dev->r1_mod = .5 + (float)dev->fpfd / chspc;

  tmp = .5 + ((float)tmp / dev->fpfd); 

This was a better match to 2 lines in the Windows .cs GUI that implement rounding: 

  MOD = (uint)(Math.Round(1000 * (PFDFreq / (decimal)OutputChannelSpacing)));

  FRAC = (uint)(Math.Round(((double)N - INT) * MOD)); 

This change made the actual frequency calculations a bit closer to the target freq and match the GUI behavior. 

2. I added this cast, “(uint32_t)”, to prevent band_sel_div sign extension and corruption of the MSBs here:

       dev->regs[ADF4350_REG4] =

              ADF4350_REG4_FEEDBACK_FUND |

              ADF4350_REG4_RF_DIV_SEL(dev->r4_rf_div_sel) |

              ADF4350_REG4_8BIT_BAND_SEL_CLKDIV((uint32_t)band_sel_div) |

              ADF4350_REG4_RF_OUT_EN |

              (dev->pdata->r4_user_settings &

               (ADF4350_REG4_OUTPUT_PWR(0x3) |

                ADF4350_REG4_AUX_OUTPUT_PWR(0x3) |

                ADF4350_REG4_AUX_OUTPUT_EN |

                ADF4350_REG4_AUX_OUTPUT_FUND |

                ADF4350_REG4_MUTE_TILL_LOCK_EN));

Compiler differences, perhaps, made this necessary,

Steve