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ardnew
25 lines
551 B
Go
25 lines
551 B
Go
// +build arm
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package usb
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import "device/arm"
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// udelay waits for the given number of microseconds before returning.
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// We cannot use the sleep timer from this context (import cycle), but we need
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// an approximate method to spin CPU cycles for short periods of time.
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//go:inline
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func udelay(microsec uint32) {
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n := cycles(microsec, descCPUFrequencyHz)
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for i := uint32(0); i < n; i++ {
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arm.Asm(`nop`)
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}
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}
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func disableInterrupts() uintptr {
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return arm.DisableInterrupts()
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}
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func enableInterrupts(mask uintptr) {
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arm.EnableInterrupts(mask)
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}
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