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stm32: xspi wait for prescaler change

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This is documented as being required (and is done by stm32cube),
hasn't been observed as a problem though.
This commit is contained in:
Matt Johnston 2025-04-02 21:00:08 +08:00
parent 65f849a589
commit e22fe7cbcf
1 changed files with 9 additions and 8 deletions
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17
embassy-stm32/src/xspi/mod.rs
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@ -335,8 +335,17 @@ impl<'d, T: Instance, M: PeriMode> Xspi<'d, T, M> {
w.set_prescaler(config.clock_prescaler);
});
// Wait for busy flag to clear after changing prescaler, during calibration
while T::REGS.sr().read().busy() {}
T::REGS.cr().modify(|w| {
w.set_dmm(dual_quad);
// TODO: at the moment only ncs1 seems to get passed in?
// Only one must be selected
assert!(!(ncs1.is_some() && ncs2.is_some()));
assert!(!(ncs1.is_none() && ncs2.is_none()));
w.set_cssel(if ncs1.is_some() { Cssel::B_0X0 } else { Cssel::B_0X1 });
});
T::REGS.tcr().modify(|w| {
@ -344,14 +353,6 @@ impl<'d, T: Instance, M: PeriMode> Xspi<'d, T, M> {
w.set_dhqc(config.delay_hold_quarter_cycle);
});
// TODO: at the moment only ncs1 seems to get passed in?
// Only one must be selected
assert!(!(ncs1.is_some() && ncs2.is_some()));
assert!(!(ncs1.is_none() && ncs2.is_none()));
T::REGS.cr().modify(|w| {
w.set_cssel(if ncs1.is_some() { Cssel::B_0X0 } else { Cssel::B_0X1 });
});
// Enable peripheral
T::REGS.cr().modify(|w| {
w.set_en(true);