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Reduce control loop rate to 100Hz

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Ed
2024-01-05 11:18:29 +00:00
parent 702e8d14b9
commit b242c54574
1 changed files with 26 additions and 14 deletions
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40
lib_xua/src/core/clocking/clockgen.xc
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@@ -8,8 +8,6 @@
#include "xua_commands.h"
#include "xua_clocking.h"
#include <stdio.h> // TODO DEV ONLY - DELME
#ifdef __XS3A__
#define USE_SW_PLL 1
#else
@@ -306,22 +304,35 @@ void do_sw_pll_phase_frequency_detector( sw_pll_state_t sw_pll,
chanend c_sigma_delta,
int receivedSamples)
{
const unsigned control_loop_rate_divider = 6; /* 300Hz * 2 edges / 6 -> 100Hz loop rate */
static unsigned control_loop_counter = 0;
static unsigned total_received_samples = 0;
/* Keep a store of the last mclk time stamp so we can work out the increment */
static unsigned short last_mclk_time_stamp = 0;
/* Calculate what the zero-error mclk count increment should be for this many samples */
const unsigned expected_mclk_inc = mclks_per_sample * receivedSamples / 2; /* divide by 2 because this fn is called per edge */
control_loop_counter++;
/* Calculate actualy time-stamped mclk count increment is */
const unsigned short actual_mclk_inc = mclk_time_stamp - last_mclk_time_stamp;
total_received_samples += receivedSamples;
/* The difference is the raw error in terms of mclk counts */
short f_error = (int)actual_mclk_inc - (int)expected_mclk_inc;
if(control_loop_counter == control_loop_rate_divider)
{
/* Calculate what the zero-error mclk count increment should be for this many samples */
const unsigned expected_mclk_inc = mclks_per_sample * total_received_samples / 2; /* divide by 2 because this fn is called per edge */
/* send PFD output to the sigma delta thread */
outuint(c_sigma_delta, (unsigned) (1000000 + f_error));
last_mclk_time_stamp = mclk_time_stamp;
/* Calculate actualy time-stamped mclk count increment is */
const unsigned short actual_mclk_inc = mclk_time_stamp - last_mclk_time_stamp;
/* The difference is the raw error in terms of mclk counts */
short f_error = (int)actual_mclk_inc - (int)expected_mclk_inc;
/* send PFD output to the sigma delta thread */
outuint(c_sigma_delta, (unsigned) (1000000 + f_error));
last_mclk_time_stamp = mclk_time_stamp;
control_loop_counter = 0;
total_received_samples = 0;
}
}
void SigmaDeltaTask(chanend c_sigma_delta, unsigned sdm_interval){
@@ -354,7 +365,6 @@ void SigmaDeltaTask(chanend c_sigma_delta, unsigned sdm_interval){
{
case inuint_byref(c_sigma_delta, tmp):
f_error = (int32_t)tmp;
printstr("sigma-delta got: "); printintln(f_error);
unsafe
{
sw_pll_sdm_do_control_from_error(sw_pll_ptr, -f_error + 1000000);
@@ -539,7 +549,9 @@ void clockGen ( streaming chanend ?c_spdif_rx,
chan c_sigma_delta;
sw_pll_state_t sw_pll;
/* Initialise before we par off the SDM task */
/* Initialise before we par off the SDM thread/
We share the sw_pll struct across threads and this
us safe because the threads access different memebers */
unsafe
{
sw_pll_ptr = &sw_pll;