artiq/soc/runtime/rtio.c

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#include <generated/csr.h>
#include "exceptions.h"
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#include "rtio.h"
long long int previous_fud_end_time;
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void rtio_init(void)
{
previous_fud_end_time = 0;
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rtio_reset_counter_write(1);
rtio_reset_logic_write(1);
rtio_reset_logic_write(0);
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}
void rtio_oe(int channel, int oe)
{
rtio_chan_sel_write(channel);
rtio_oe_write(oe);
}
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void rtio_set(long long int timestamp, int channel, int value)
{
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rtio_reset_counter_write(0);
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rtio_chan_sel_write(channel);
rtio_o_timestamp_write(timestamp);
rtio_o_value_write(value);
while(!rtio_o_writable_read());
rtio_o_we_write(1);
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if(rtio_o_error_read()) {
rtio_reset_logic_write(1);
rtio_reset_logic_write(0);
exception_raise(EID_RTIO_UNDERFLOW);
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}
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}
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void rtio_replace(long long int timestamp, int channel, int value)
{
rtio_chan_sel_write(channel);
rtio_o_timestamp_write(timestamp);
rtio_o_value_write(value);
rtio_o_replace_write(1);
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if(rtio_o_error_read()) {
rtio_reset_logic_write(1);
rtio_reset_logic_write(0);
exception_raise(EID_RTIO_UNDERFLOW);
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}
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}
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void rtio_sync(int channel)
{
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rtio_chan_sel_write(channel);
while(rtio_o_level_read() != 0);
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}
long long int rtio_get(int channel)
{
long long int r;
rtio_chan_sel_write(channel);
while(rtio_i_readable_read() || (rtio_o_level_read() != 0)) {
if(rtio_i_readable_read()) {
r = rtio_i_value_read();
rtio_i_re_write(1);
return r;
}
}
return -1;
}
#define RTIO_FUD_CHANNEL 4
void rtio_fud_sync(void)
{
rtio_sync(RTIO_FUD_CHANNEL);
}
void rtio_fud(long long int fud_time)
{
long long int fud_end_time;
rtio_reset_counter_write(0);
rtio_chan_sel_write(RTIO_FUD_CHANNEL);
if(fud_time < 0) {
rtio_counter_update_write(1);
fud_time = rtio_counter_read() + 4000;
}
fud_end_time = fud_time + 3*8;
if(fud_time < previous_fud_end_time)
exception_raise(EID_RTIO_SEQUENCE_ERROR);
previous_fud_end_time = fud_end_time;
rtio_o_timestamp_write(fud_time);
rtio_o_value_write(1);
rtio_o_we_write(1);
rtio_o_timestamp_write(fud_end_time);
rtio_o_value_write(0);
rtio_o_we_write(1);
if(rtio_o_error_read()) {
rtio_reset_logic_write(1);
rtio_reset_logic_write(0);
exception_raise(EID_RTIO_UNDERFLOW);
}
}