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firmware: optimize and rename rffc5071 synth config function

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This commit is contained in:
mndza
2025-08-19 11:40:08 +02:00
parent d3ee417807
commit ac0552a5b9
1 changed files with 13 additions and 17 deletions
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30
firmware/common/rffc5071.c
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@@ -220,12 +220,11 @@ void rffc5071_enable(rffc5071_driver_t* const drv)
#define REF_FREQ 40
#define FREQ_ONE_MHZ (1000 * 1000)
/* configure frequency synthesizer in integer mode (lo in MHz) */
uint64_t rffc5071_config_synth_int(rffc5071_driver_t* const drv, uint16_t lo)
/* configure frequency synthesizer (lo in MHz) */
uint64_t rffc5071_config_synth(rffc5071_driver_t* const drv, uint16_t lo)
{
uint8_t lodiv;
uint16_t fvco;
uint8_t fbkdiv;
uint8_t fbkdivlog;
uint16_t n;
uint64_t tune_freq_hz;
uint16_t p1nmsb;
@@ -239,8 +238,7 @@ uint64_t rffc5071_config_synth_int(rffc5071_driver_t* const drv, uint16_t lo)
x >>= 1;
}
lodiv = 1 << n_lo;
fvco = lodiv * lo;
fvco = lo << n_lo;
/* higher divider and charge pump current required above
* 3.2GHz. Programming guide says these values (fbkdiv, n,
@@ -248,26 +246,24 @@ uint64_t rffc5071_config_synth_int(rffc5071_driver_t* const drv, uint16_t lo)
* improve phase noise, since the VCO will already be stable
* and will be unaffected. */
if (fvco > 3200) {
fbkdiv = 4;
fbkdivlog = 2;
set_RFFC5071_PLLCPL(drv, 3);
} else {
fbkdiv = 2;
fbkdivlog = 1;
set_RFFC5071_PLLCPL(drv, 2);
}
uint64_t tmp_n = ((uint64_t) fvco << 29ULL) / (fbkdiv * REF_FREQ);
n = tmp_n >> 29ULL;
uint64_t tmp_n = ((uint64_t) fvco << (24ULL - fbkdivlog)) / REF_FREQ;
n = tmp_n >> 24ULL;
p1nmsb = (tmp_n >> 8ULL) & 0xffff;
p1nlsb = tmp_n & 0xff;
p1nmsb = (tmp_n >> 13ULL) & 0xffff;
p1nlsb = (tmp_n >> 5ULL) & 0xff;
tune_freq_hz = (REF_FREQ * (tmp_n >> 5ULL) * fbkdiv * FREQ_ONE_MHZ) /
(lodiv * (1 << 24ULL));
tune_freq_hz = (tmp_n * REF_FREQ * FREQ_ONE_MHZ) >> (24 - fbkdivlog + n_lo);
/* Path 2 */
set_RFFC5071_P2LODIV(drv, n_lo);
set_RFFC5071_P2N(drv, n);
set_RFFC5071_P2PRESC(drv, fbkdiv >> 1);
set_RFFC5071_P2PRESC(drv, fbkdivlog);
set_RFFC5071_P2NMSB(drv, p1nmsb);
set_RFFC5071_P2NLSB(drv, p1nlsb);
@@ -282,7 +278,7 @@ uint64_t rffc5071_set_frequency(rffc5071_driver_t* const drv, uint16_t mhz)
uint32_t tune_freq;
rffc5071_disable(drv);
tune_freq = rffc5071_config_synth_int(drv, mhz);
tune_freq = rffc5071_config_synth(drv, mhz);
rffc5071_enable(drv);
return tune_freq;