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This commit is contained in:
Oscar Bailey
2019-02-26 17:18:02 +00:00
parent 86b4ab89ea
commit b12aeac264
8 changed files with 71 additions and 67 deletions
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12
examples/xua_lite_example/src/rate_controller.xc
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@@ -58,7 +58,7 @@ static inline xua_lite_fixed_point_t add_noise(xua_lite_fixed_point_t input){
return (xua_lite_fixed_point_t)( output_64 >> (64 - XUA_LIGHT_FIXED_POINT_TOTAL_BITS - 1));
}
//Convert the control input into a pdm output (dither) with optional noise
//Convert the control input into a pdm output (dither) with optional noise
void do_clock_nudge_pdm(xua_lite_fixed_point_t controller_out, int *clock_nudge){
//Randomise - add a proportion of rectangular probability distribution noise to spread the spectrum
@@ -96,7 +96,7 @@ xua_lite_fixed_point_t do_rate_control(int fill_level, pid_state_t *pid_state){
//Calculate the value for the integral term which is the accumulated fill level error
xua_lite_fixed_point_t i_term_pre_clip = pid_state->fifo_level_accum + fifo_level_filtered;
//clip the I term (which can wind up) to maximum fixed point representation. Check to see if overflow (which will change sign)
if (fifo_level_filtered >= 0){ //If it was positive before, ensure it still is else clip to positive
if (i_term_pre_clip >= pid_state->fifo_level_accum){
@@ -159,18 +159,18 @@ void do_feedback_calculation(unsigned &sof_count
// Average over 128 SOFs - 128 x 3072 = 0x60000.
unsigned long long feedbackMul = 64ULL;
if(AUDIO_CLASS == 1) feedbackMul = 8ULL; // TODO Use 4 instead of 8 to avoid windows LSB issues?
if(AUDIO_CLASS == 1) feedbackMul = 8ULL; // TODO Use 4 instead of 8 to avoid windows LSB issues?
// Number of MCLK ticks in this SOF period (E.g = 125 * 24.576 = 3072)
// Number of MCLK ticks in this SOF period (E.g = 125 * 24.576 = 3072)
int mclk_ticks_this_sof_period = (int) ((short)(mclk_port_counter - mclk_port_counter_old));
unsigned long long full_result = mclk_ticks_this_sof_period * feedbackMul * DEFAULT_FREQ;
feedback_value += full_result;
// Store MCLK for next time around...
// Store MCLK for next time around...
mclk_port_counter_old = mclk_port_counter;
// Reset counts based on SOF counting. Expect 16ms (128 HS SOFs/16 FS SOFS) per feedback poll
// We always count 128 SOFs, so 16ms @ HS, 128ms @ FS
// We always count 128 SOFs, so 16ms @ HS, 128ms @ FS
if(sof_count == 128){
//debug_printf("fb\n");
sof_count = 0;