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make smooth frequency sweep

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TT 2017-01-28 02:47:55 +09:00
parent abfe237d23
commit c9e00287a3
1 changed files with 8 additions and 4 deletions
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12
si5351.c
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@ -313,7 +313,7 @@ si5351_set_frequency_with_offset(int freq, int offset, uint8_t drive_strength)
band = 2; band = 2;
} }
#if 0 #if 1
if (current_band != band) if (current_band != band)
si5351_disable_output(); si5351_disable_output();
#endif #endif
@ -321,8 +321,12 @@ si5351_set_frequency_with_offset(int freq, int offset, uint8_t drive_strength)
switch (band) { switch (band) {
case 0: case 0:
// fractional divider mode. only PLL A is used. // fractional divider mode. only PLL A is used.
//if (current_band != 0) if (current_band != 0)
si5351_setupPLL(SI5351_PLL_A, 32, 0, 1); si5351_setupPLL(SI5351_PLL_A, 32, 0, 1);
// Set PLL twice on changing from band 2
if (current_band == 2)
si5351_setupPLL(SI5351_PLL_A, 32, 0, 1);
si5351_set_frequency_fixedpll(0, SI5351_PLL_A, PLLFREQ, freq + offset, si5351_set_frequency_fixedpll(0, SI5351_PLL_A, PLLFREQ, freq + offset,
SI5351_CLK_DRIVE_STRENGTH_2MA); SI5351_CLK_DRIVE_STRENGTH_2MA);
si5351_set_frequency_fixedpll(1, SI5351_PLL_A, PLLFREQ, freq, drive_strength); si5351_set_frequency_fixedpll(1, SI5351_PLL_A, PLLFREQ, freq, drive_strength);
@ -350,9 +354,9 @@ si5351_set_frequency_with_offset(int freq, int offset, uint8_t drive_strength)
break; break;
} }
si5351_reset_pll();
if (current_band != band) { if (current_band != band) {
#if 0 si5351_reset_pll();
#if 1
si5351_enable_output(); si5351_enable_output();
#endif #endif
delay += 0; delay += 0;