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@ -25,27 +25,29 @@ fn set_pins(card_index: usize, chan_index: usize, pins: u32) {
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pub fn program(card_index: usize, chan_index: usize, atten: u8) {
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assert!(card_index < 4 && chan_index < 2);
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// 0b111111 = 1dB
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info!("card {} channel {} set to {}{} dB",
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card_index, chan_index,
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atten / 2, if atten % 2 != 0 { ".5" } else { "" });
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// 0b111111 = 0dB
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// 0b111110 = 0.5dB
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// 0b111101 = 1dB
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// 0b111100 = 1.5dB
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// ...
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// 0b011111 = 16dB
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// ...
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// 0b000000 = 31.5dB
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let atten = !(atten << 2);
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let atten = !atten << 2;
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let set_pins = |pins| set_pins(card_index, chan_index, pins);
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set_pins(PIN_RST);
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set_pins(0);
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for n in 0..8 {
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for n in (0..8).rev() {
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let sin = if atten & 1 << n != 0 { PIN_SIN } else { 0 };
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set_pins(sin);
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set_pins(sin | PIN_CLK);
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}
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set_pins(PIN_LE);
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info!("card {} channel {} set to {}{} dB",
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card_index, chan_index,
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atten / 2, if atten % 2 != 0 { ".5" } else { "" });
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}
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/// See `program`.
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