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artiq/soc/runtime/dds.c

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#include <generated/csr.h>
#include <stdio.h>
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#include "exceptions.h"
#include "rtio.h"
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#include "log.h"
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#include "dds.h"
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#define DURATION_WRITE (5 << RTIO_FINE_TS_WIDTH)
#define DURATION_INIT (7*DURATION_WRITE) /* not counting FUD */
#define DURATION_PROGRAM (8*DURATION_WRITE) /* not counting FUD */
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#define DDS_WRITE(addr, data) do { \
rtio_o_address_write(addr); \
rtio_o_data_write(data); \
rtio_o_timestamp_write(now); \
rtio_write_and_process_status(now, RTIO_DDS_CHANNEL); \
now += DURATION_WRITE; \
} while(0)
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void dds_init_all(void)
{
int i;
long long int now;
now = rtio_get_counter() + 10000;
for(i=0;i<DDS_CHANNEL_COUNT;i++) {
dds_init(now, i);
now += DURATION_INIT + DURATION_WRITE; /* + FUD time */
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}
while(rtio_get_counter() < now);
}
void dds_init(long long int timestamp, int channel)
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{
long long int now;
rtio_chan_sel_write(RTIO_DDS_CHANNEL);
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now = timestamp - DURATION_INIT;
DDS_WRITE(DDS_GPIO, channel);
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DDS_WRITE(DDS_GPIO, channel | (1 << 5));
DDS_WRITE(DDS_GPIO, channel);
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DDS_WRITE(0x00, 0x78);
DDS_WRITE(0x01, 0x00);
DDS_WRITE(0x02, 0x00);
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DDS_WRITE(0x03, 0x00);
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DDS_WRITE(DDS_FUD, 0);
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}
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/* Compensation to keep phase continuity when switching from absolute or tracking
* to continuous phase mode. */
static unsigned int continuous_phase_comp[DDS_CHANNEL_COUNT];
static void dds_set_one(long long int now, long long int ref_time, unsigned int channel,
unsigned int ftw, unsigned int pow, int phase_mode)
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{
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if(channel >= DDS_CHANNEL_COUNT) {
log("Attempted to set invalid DDS channel");
return;
}
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DDS_WRITE(DDS_GPIO, channel);
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DDS_WRITE(DDS_FTW0, ftw & 0xff);
DDS_WRITE(DDS_FTW1, (ftw >> 8) & 0xff);
DDS_WRITE(DDS_FTW2, (ftw >> 16) & 0xff);
DDS_WRITE(DDS_FTW3, (ftw >> 24) & 0xff);
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/* We need the RTIO fine timestamp clock to be phase-locked
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* to DDS SYSCLK, and divided by an integer DDS_RTIO_CLK_RATIO.
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*/
if(phase_mode == PHASE_MODE_CONTINUOUS) {
/* Do not clear phase accumulator on FUD */
DDS_WRITE(0x02, 0x00);
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pow += continuous_phase_comp[channel];
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} else {
long long int fud_time;
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/* Clear phase accumulator on FUD */
DDS_WRITE(0x02, 0x40);
fud_time = now + 2*DURATION_WRITE;
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pow -= (ref_time - fud_time)*DDS_RTIO_CLK_RATIO*ftw >> 18;
if(phase_mode == PHASE_MODE_TRACKING)
pow += ref_time*DDS_RTIO_CLK_RATIO*ftw >> 18;
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continuous_phase_comp[channel] = pow;
}
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DDS_WRITE(DDS_POW0, pow & 0xff);
DDS_WRITE(DDS_POW1, (pow >> 8) & 0x3f);
DDS_WRITE(DDS_FUD, 0);
}
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struct dds_set_params {
int channel;
unsigned int ftw;
unsigned int pow;
int phase_mode;
};
static int batch_mode;
static int batch_count;
static long long int batch_ref_time;
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static struct dds_set_params batch[DDS_MAX_BATCH];
void dds_batch_enter(long long int timestamp)
{
if(batch_mode)
exception_raise(EID_DDS_BATCH_ERROR);
batch_mode = 1;
batch_count = 0;
batch_ref_time = timestamp;
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}
void dds_batch_exit(void)
{
long long int now;
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int i;
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if(!batch_mode)
exception_raise(EID_DDS_BATCH_ERROR);
rtio_chan_sel_write(RTIO_DDS_CHANNEL);
/* + FUD time */
now = batch_ref_time - batch_count*(DURATION_PROGRAM + DURATION_WRITE);
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for(i=0;i<batch_count;i++) {
dds_set_one(now, batch_ref_time,
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batch[i].channel, batch[i].ftw, batch[i].pow, batch[i].phase_mode);
now += DURATION_PROGRAM + DURATION_WRITE;
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}
batch_mode = 0;
}
void dds_set(long long int timestamp, int channel,
unsigned int ftw, unsigned int pow, int phase_mode)
{
if(batch_mode) {
if(batch_count >= DDS_MAX_BATCH)
exception_raise(EID_DDS_BATCH_ERROR);
/* timestamp parameter ignored (determined by batch) */
batch[batch_count].channel = channel;
batch[batch_count].ftw = ftw;
batch[batch_count].pow = pow;
batch[batch_count].phase_mode = phase_mode;
batch_count++;
} else {
rtio_chan_sel_write(RTIO_DDS_CHANNEL);
dds_set_one(timestamp - DURATION_PROGRAM, timestamp, channel, ftw, pow, phase_mode);
}
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}