forked from M-Labs/artiq
jesd204sync: print DDMTD SYSREF final alignment delta
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eebff6d77f
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@ -172,18 +172,15 @@ fn max_phase_deviation(average: i32, phases: &[i32]) -> i32 {
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return ret;
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}
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fn reach_sysref_ddmtd_target(target: i32, tolerance: i32) -> Result<(), &'static str> {
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let mut phase = measure_ddmdt_phase();
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let mut nslips = 0;
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while (phase - target).abs() > tolerance {
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hmc7043::sysref_slip();
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nslips += 1;
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if nslips > 1024 {
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return Err("failed to reach SYSREF DDMTD phase target");
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fn reach_sysref_ddmtd_target(target: i32, tolerance: i32) -> Result<i32, &'static str> {
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for _ in 0..1024 {
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let delta = (measure_ddmdt_phase() - target + DDMTD_N) % DDMTD_N;
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if delta <= tolerance {
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return Ok(delta)
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}
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phase = measure_ddmdt_phase();
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hmc7043::sysref_slip();
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}
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Ok(())
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Err("failed to reach SYSREF DDMTD phase target")
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}
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fn calibrate_sysref_target(rising_average: i32, falling_average: i32) -> Result<i32, &'static str> {
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@ -275,11 +272,11 @@ pub fn sysref_auto_rtio_align() -> Result<(), &'static str> {
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};
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info!("aligning SYSREF with RTIO clock...");
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reach_sysref_ddmtd_target(target_phase, 3)?;
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let delta = reach_sysref_ddmtd_target(target_phase, 3)?;
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if sysref_sh_error() {
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return Err("SYSREF does not meet S/H timing at DDMTD phase target");
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}
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info!(" ...done");
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info!(" ...done, delta={}", delta);
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sysref_rtio_align()?;
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