forked from M-Labs/artiq
sayma: reimplement DAC SYSREF autocalibration
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@ -222,10 +222,48 @@ pub fn sysref_auto_rtio_align() -> Result<(), &'static str> {
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}
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fn sysref_cal_dac(dacno: u8) -> Result<u8, &'static str> {
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// TODO
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info!("calibrating SYSREF phase at DAC-{}...", dacno);
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info!(" ...done");
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Ok(7)
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info!("calibrating SYSREF delay at DAC-{}...", dacno);
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// Allocate for more than expected as jitter may create spurious entries.
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let mut limits_buf = [0; 8];
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let mut n_limits = 0;
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limits_buf[n_limits] = -1;
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n_limits += 1;
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// avoid spurious rotation at delay=0
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hmc7043::sysref_delay_dac(dacno, 0);
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ad9154::dac_sync(dacno)?;
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for scan_delay in 0..hmc7043::ANALOG_DELAY_RANGE {
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hmc7043::sysref_delay_dac(dacno, scan_delay);
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if ad9154::dac_sync(dacno)? {
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limits_buf[n_limits] = scan_delay as i16;
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n_limits += 1;
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if n_limits >= limits_buf.len() - 1 {
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break;
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}
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}
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}
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limits_buf[n_limits] = hmc7043::ANALOG_DELAY_RANGE as i16;
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n_limits += 1;
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info!(" using limits: {:?}", &limits_buf[..n_limits]);
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let mut delay = 0;
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let mut best_margin = 0;
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for i in 0..(n_limits-1) {
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let margin = limits_buf[i+1] - limits_buf[i];
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if margin > best_margin {
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best_margin = margin;
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delay = ((limits_buf[i+1] + limits_buf[i])/2) as u8;
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}
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}
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info!(" ...done, value={}", delay);
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Ok(delay)
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}
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fn sysref_dac_align(dacno: u8, delay: u8) -> Result<(), &'static str> {
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