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Add method to trigger system reset #94

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Merged
merged 2 commits into from
Aug 3, 2018
+20 −0
Merged

Add method to trigger system reset #94

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905629f
add method to trigger system reset
bergus Jun 17, 2018
30b40eb
add side effect to the infinite loop to avoid a LLVM bug
japaric Aug 3, 2018
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20 changes: 20 additions & 0 deletions src/peripheral/scb.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -598,3 +598,23 @@ impl SCB {
}
}
}

const SCB_AIRCR_VECTKEY: u32 = 0x05FA << 16;
const SCB_AIRCR_PRIGROUP_MASK: u32 = 0x5 << 8;
const SCB_AIRCR_SYSRESETREQ: u32 = 1 << 2;

impl SCB {
/// Initiate a system reset request to reset the MCU
pub fn system_reset(&mut self) -> ! {
::asm::dsb();
unsafe { self.aircr.modify(|r|
SCB_AIRCR_VECTKEY | // otherwise the write is ignored
r & SCB_AIRCR_PRIGROUP_MASK | // keep priority group unchanged
SCB_AIRCR_SYSRESETREQ // set the bit
) };
::asm::dsb();
loop { // wait for the reset
::asm::nop(); // avoid rust-lang/rust#28728
}
}
}