27 lines
1.4 KiB
Rust
27 lines
1.4 KiB
Rust
use super::hal::time::MegaHertz;
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/// The ADC setup time is the number of seconds after the CSn line goes low before the serial clock
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/// may begin. This is used for performing the internal ADC conversion.
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pub const ADC_SETUP_TIME: f32 = 220e-9;
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/// The maximum DAC/ADC serial clock line frequency. This is a hardware limit.
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pub const ADC_DAC_SCK_MAX: MegaHertz = MegaHertz(50);
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/// The optimal counting frequency of the hardware timers used for timestamping and sampling.
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pub const TIMER_FREQUENCY: MegaHertz = MegaHertz(100);
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/// The QSPI frequency for communicating with the pounder DDS.
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pub const POUNDER_QSPI_FREQUENCY: MegaHertz = MegaHertz(40);
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/// The delay after initiating a QSPI transfer before asserting the IO_Update for the pounder DDS.
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// Pounder Profile writes are always 16 bytes, with 2 cycles required per byte, coming out to a
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// total of 32 QSPI clock cycles. The QSPI is configured for 40MHz, so this comes out to an offset
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// of 800nS. We use 900ns to be safe.
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pub const POUNDER_IO_UPDATE_DELAY: f32 = 900_e-9;
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/// The duration to assert IO_Update for the pounder DDS.
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// IO_Update should be latched for 4 SYNC_CLK cycles after the QSPI profile write. With pounder
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// SYNC_CLK running at 100MHz (1/4 of the pounder reference clock of 400MHz), this corresponds to
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// 40ns. To accomodate rounding errors, we use 50ns instead.
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pub const POUNDER_IO_UPDATE_DURATION: f32 = 50_e-9;
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