//----------------------------------------------------------------------------
int Adf4351::SetLowSpurMode( int lsmode )
{
if( lsmode ){
mRegs[ADF4351_REG2] |= ADF4351_REG2_NOISE_MODE(0x3);
}
else{
mRegs[ADF4351_REG2] &= ~ADF4351_REG2_NOISE_MODE(0x3);
}
(mSpiWriteFunc)(mDevNum,mLog&ADF_LOG_WRITES,mRegs[ADF4351_REG2]);
return(0);
}
/***************************************************************************//**
* @brief Sets the ADF4351 frequency on the specified channel.
*
* @param st - The selected structure.
* @param freq - The desired frequency value.
* @param channel - 0 = RX channel, 1 = TX channel
*
* @return calculatedFrequency - The actual frequency value that was set.
*******************************************************************************/
int64_t adf4351_set_freq(struct adf4351_state *st, uint64_t freq,
char channel)
{
struct adf4351_platform_data *pdata = st->pdata;
uint64_t tmp;
uint32_t div_gcd, prescaler, chspc;
uint16_t mdiv, r_cnt = 0;
uint8_t band_sel_div;
int32_t ret;
if ((freq > ADF4351_MAX_OUT_FREQ) || (freq < ADF4351_MIN_OUT_FREQ))
return -1;
st->r4_rf_div_sel = 0;
while (freq < ADF4351_MIN_VCO_FREQ) {
freq <<= 1;
st->r4_rf_div_sel++;
}
if (freq > ADF4351_MAX_FREQ_45_PRESC) {
prescaler = ADF4351_REG1_PRESCALER;
mdiv = 75;
} else {
prescaler = 0;
mdiv = 23;
}
/*
* Allow a predefined reference division factor
* if not set, compute our own
*/
if (pdata->ref_div_factor)
r_cnt = pdata->ref_div_factor - 1;
chspc = st->chspc;
do {
do {
do {
r_cnt = adf4351_tune_r_cnt(st, r_cnt);
st->r1_mod = st->fpfd / chspc;
if (r_cnt > ADF4351_MAX_R_CNT) {
/* try higher spacing values */
chspc++;
r_cnt = 0;
}
} while ((st->r1_mod > ADF4351_MAX_MODULUS) && r_cnt);
} while (r_cnt == 0);
tmp = freq * (uint64_t)st->r1_mod + (st->fpfd > 1);
tmp = (tmp / st->fpfd); /* Div round closest (n + d/2)/d */
st->r0_fract = tmp % st->r1_mod;
tmp = tmp / st->r1_mod;
st->r0_int = (uint32_t)tmp;
} while (mdiv > st->r0_int);
band_sel_div = (((st->fpfd) + (ADF4351_MAX_BANDSEL_CLK) - 1) / (ADF4351_MAX_BANDSEL_CLK)); // DIV_ROUND_UP
if (st->fpfd == ADF4351_MAX_FREQ_PFD)
band_sel_div = 255;
if (st->r0_fract && st->r1_mod) {
div_gcd = gcd(st->r1_mod, st->r0_fract);
st->r1_mod /= div_gcd;
st->r0_fract /= div_gcd;
} else {
st->r0_fract = 0;
st->r1_mod = 1;
}
st->regs[ADF4351_REG0] = ADF4351_REG0_INT(st->r0_int) |
ADF4351_REG0_FRACT(st->r0_fract);
st->regs[ADF4351_REG1] = ADF4351_REG1_PHASE(1) |
ADF4351_REG1_MOD(st->r1_mod) |
prescaler;
st->regs[ADF4351_REG2] =
ADF4351_REG2_10BIT_R_CNT(r_cnt) |
ADF4351_REG2_DOUBLE_BUFF_EN |
(pdata->ref_doubler_en ? ADF4351_REG2_RMULT2_EN : 0) |
(pdata->ref_div2_en ? ADF4351_REG2_RDIV2_EN : 0) |
(pdata->r2_user_settings & (ADF4351_REG2_PD_POLARITY_POS |
ADF4351_REG2_LDP_6ns | ADF4351_REG2_LDF_INT_N |
ADF4351_REG2_CHARGE_PUMP_CURR_uA(5000) |
ADF4351_REG2_MUXOUT(0x7) | ADF4351_REG2_NOISE_MODE(0x3)));
st->regs[ADF4351_REG3] = pdata->r3_user_settings &
(ADF4351_REG3_12BIT_CLKDIV(0xFFF) |
ADF4351_REG3_12BIT_CLKDIV_MODE(0x3) |
ADF4351_REG3_12BIT_CSR_EN |
ADF4351_REG3_CHARGE_CANCELLATION_EN |
ADF4351_REG3_ANTI_BACKLASH_3ns_EN |
ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH);
st->regs[ADF4351_REG4] =
ADF4351_REG4_FEEDBACK_FUND |
ADF4351_REG4_RF_DIV_SEL(st->r4_rf_div_sel) |
ADF4351_REG4_8BIT_BAND_SEL_CLKDIV(band_sel_div) |
ADF4351_REG4_RF_OUT_EN |
(pdata->r4_user_settings &
(ADF4351_REG4_OUTPUT_PWR(0x3) |
ADF4351_REG4_AUX_OUTPUT_PWR(0x3) |
ADF4351_REG4_AUX_OUTPUT_EN |
ADF4351_REG4_AUX_OUTPUT_FUND |
ADF4351_REG4_MUTE_TILL_LOCK_EN));
st->regs[ADF4351_REG5] = ADF4351_REG5_LD_PIN_MODE_DIGITAL + 0x00180000;
ret = adf4351_sync_config(st, channel);
if(ret < 0)
return ret;
tmp = (uint64_t)((st->r0_int * st->r1_mod) + st->r0_fract) * (uint64_t)st->fpfd;
tmp = tmp / ((uint64_t)st->r1_mod * ((uint64_t)1 << st->r4_rf_div_sel));
return tmp;
}
