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firmware: enable int mode if div is even integer

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to improve jitter performance
This commit is contained in:
Hoernchen
2013-06-07 22:53:50 +02:00
parent c7142aad95
commit 1e326997ed
3 changed files with 26 additions and 0 deletions
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7
firmware/common/hackrf_core.c
View File

@ -49,6 +49,9 @@ bool set_fracrate(const float freq) {
if(a != div){ if(a != div){
uint32_t j=0,k=1,l=1,m=1; uint32_t j=0,k=1,l=1,m=1;
si5351c_set_int_mode(0, 0);
while (k <= 0xFFFF && m <= 0xFFFF){ while (k <= 0xFFFF && m <= 0xFFFF){
float n = (float)(j+l)/(k+m); float n = (float)(j+l)/(k+m);
if( x == n){ if( x == n){
@ -77,6 +80,10 @@ bool set_fracrate(const float freq) {
b=j; c=k; b=j; c=k;
} }
} else { } else {
if(a & 0x1) // odd integer, needs frac mode
si5351c_set_int_mode(0, 0);
else
si5351c_set_int_mode(0, 1);
b=0; c=1; b=0; c=1;
} }

18
firmware/common/si5351c.c
View File

@ -249,3 +249,21 @@ void si5351c_configure_clock_control()
uint8_t data[] = { 3, 0xC8 }; uint8_t data[] = { 3, 0xC8 };
si5351c_write(data, sizeof(data)); si5351c_write(data, sizeof(data));
} }
void si5351c_set_int_mode(const uint_fast8_t ms_number, const uint_fast8_t on){
uint8_t data[] = {16, 0};
if(ms_number < 8){
data[0] = 16 + ms_number;
data[1] = si5351c_read_single(data[0]);
if(on)
data[1] |= SI5351C_CLK_INT_MODE;
else
data[1] &= ~(SI5351C_CLK_INT_MODE);
si5351c_write(data, 2);
}
}

1
firmware/common/si5351c.h
View File

@ -67,6 +67,7 @@ void si5351c_configure_multisynth(const uint_fast8_t ms_number,
const uint_fast8_t r_div); const uint_fast8_t r_div);
void si5351c_configure_clock_control(); void si5351c_configure_clock_control();
void si5351c_enable_clock_outputs(); void si5351c_enable_clock_outputs();
void si5351c_set_int_mode(const uint_fast8_t ms_number, const uint_fast8_t on);
void si5351c_write_single(uint8_t reg, uint8_t val); void si5351c_write_single(uint8_t reg, uint8_t val);
uint8_t si5351c_read_single(uint8_t reg); uint8_t si5351c_read_single(uint8_t reg);