forked from M-Labs/artiq
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
#include <generated/csr.h>
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#include <hw/common.h>
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#include <stdio.h>
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#include "exceptions.h"
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#include "dds.h"
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#define DDS_FTW0 0x0a
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#define DDS_FTW1 0x0b
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#define DDS_FTW2 0x0c
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#define DDS_FTW3 0x0d
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#define DDS_GPIO 0x41
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#define DDS_READ(addr) \
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MMPTR(0xb0000000 + (addr)*4)
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#define DDS_WRITE(addr, data) \
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MMPTR(0xb0000000 + (addr)*4) = data
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#define RTIO_FUD_CHANNEL 4
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static void fud_sync(void)
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{
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rtio_chan_sel_write(RTIO_FUD_CHANNEL);
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while(rtio_o_level_read() != 0);
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}
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static void fud(long long int fud_time)
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{
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int r;
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r = rtio_reset_read();
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rtio_reset_write(0);
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rtio_chan_sel_write(RTIO_FUD_CHANNEL);
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if(fud_time < 0) {
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rtio_counter_update_write(1);
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fud_time = rtio_counter_read() + 3000;
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}
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rtio_o_timestamp_write(fud_time);
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rtio_o_value_write(1);
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rtio_o_we_write(1);
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rtio_o_timestamp_write(fud_time+3*8);
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rtio_o_value_write(0);
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rtio_o_we_write(1);
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if(rtio_o_error_read())
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exception_raise(EID_RTIO_UNDERFLOW);
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if(r) {
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fud_sync();
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rtio_reset_write(1);
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}
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}
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void dds_init(void)
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{
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int i;
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for(i=0;i<8;i++) {
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DDS_WRITE(DDS_GPIO, i | (1 << 7));
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DDS_WRITE(DDS_GPIO, i);
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DDS_WRITE(0x00, 0x78);
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DDS_WRITE(0x01, 0x00);
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DDS_WRITE(0x02, 0x00);
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DDS_WRITE(0x03, 0x00);
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fud(-1);
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fud_sync();
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}
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}
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void dds_program(int channel, int ftw, long long int fud_time)
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{
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fud_sync();
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DDS_WRITE(DDS_GPIO, channel);
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DDS_WRITE(DDS_FTW0, ftw & 0xff);
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DDS_WRITE(DDS_FTW1, (ftw >> 8) & 0xff);
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DDS_WRITE(DDS_FTW2, (ftw >> 16) & 0xff);
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DDS_WRITE(DDS_FTW3, (ftw >> 24) & 0xff);
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fud(fud_time);
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}
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