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[stm32-lvgl] Fix an interrupt safety bug that caused occasional crashes #164
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Original file line number | Diff line number | Diff line change | ||||
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@@ -69,13 +69,23 @@ func SystickTimerISR() { | |||||
uptimeInMs += 1 | ||||||
} | ||||||
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// The following interrupt set up is trickier that it looks on the surface. The | ||||||
// ISR Swift code must be "trivial" directly and transitively, and namely it | ||||||
// must avoid destroying any heap objects (because we could be inside malloc | ||||||
// when the interrupt hits). For that, the expectation is that | ||||||
// lcdInterruptVerticalSyncHandler is only ever set once, and it not changing | ||||||
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Suggested change
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// after boot. The code inside the lcdInterruptVerticalSyncHandler closure is | ||||||
// expected to only perform trivial operations. lcdInterruptVerticalSyncEnabled | ||||||
// is allowed to change. | ||||||
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var lcdInterruptVerticalSyncHandler: (() -> Void)? = nil | ||||||
var lcdInterruptVerticalSyncEnabled: Bool = false | ||||||
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@_cdecl("LtdcIntHandlerISR") | ||||||
func LtdcIntHandlerISR() { | ||||||
let sr = ltdc.isr.read() | ||||||
ltdc.icr.write { $0.storage = sr.storage } | ||||||
if sr.raw.rrif != 0 { | ||||||
lcdInterruptVerticalSyncHandler?() | ||||||
if lcdInterruptVerticalSyncEnabled { lcdInterruptVerticalSyncHandler?() } | ||||||
} | ||||||
} |
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