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qspi: bump spi speed to 100 MHz

This commit is contained in:
Robert Jördens 2021-07-28 11:50:28 +00:00
parent 53087e0ef4
commit 2cd611de74
1 changed files with 5 additions and 5 deletions
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10
src/hardware/design_parameters.rs
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@ -11,13 +11,13 @@ pub const ADC_DAC_SCK_MAX: MegaHertz = MegaHertz(50);
pub const TIMER_FREQUENCY: MegaHertz = MegaHertz(100); pub const TIMER_FREQUENCY: MegaHertz = MegaHertz(100);
/// The QSPI frequency for communicating with the pounder DDS. /// The QSPI frequency for communicating with the pounder DDS.
pub const POUNDER_QSPI_FREQUENCY: MegaHertz = MegaHertz(40); pub const POUNDER_QSPI_FREQUENCY: MegaHertz = MegaHertz(100);
/// The delay after initiating a QSPI transfer before asserting the IO_Update for the pounder DDS. /// The delay after initiating a QSPI transfer before asserting the IO_Update for the pounder DDS.
// Pounder Profile writes are always 16 bytes, with 2 cycles required per byte, coming out to a // Pounder Profile writes are up to 16 bytes, with 2 cycles required per byte, coming out to a
// total of 32 QSPI clock cycles. The QSPI is configured for 40MHz, so this comes out to an offset // total of 32 QSPI clock cycles. The QSPI is configured for 100MHz, so this comes out to an offset
// of 800nS. We use 900ns to be safe. // of 320 ns. We use 400 ns to be safe.
pub const POUNDER_IO_UPDATE_DELAY: f32 = 900e-9; pub const POUNDER_IO_UPDATE_DELAY: f32 = 400e-9;
/// The duration to assert IO_Update for the pounder DDS. /// The duration to assert IO_Update for the pounder DDS.
// IO_Update should be latched for 4 SYNC_CLK cycles after the QSPI profile write. With pounder // IO_Update should be latched for 4 SYNC_CLK cycles after the QSPI profile write. With pounder