rp2: prevent pwm Period method overflow

soypat · deadprogram · commit fe20079300e1 · 2026-01-09T09:36:32.000Z
diff --git a/src/machine/machine_rp2_pwm.go b/src/machine/machine_rp2_pwm.go
@@ -153,7 +153,7 @@ func (p *pwmGroup) Period() uint64 {
 	top := p.getWrap()
 	phc := p.getPhaseCorrect()
 	Int, frac := p.getClockDiv()
-	return (16*uint64(Int) + uint64(frac)) * uint64((top+1)*(phc+1)*1e9) / (16 * freq) // cycles = (TOP+1) * (CSRPHCorrect + 1) * (DIV_INT + DIV_FRAC/16)
+	return (16*uint64(Int) + uint64(frac)) * uint64((top+1)*(phc+1)) * uint64(1e9) / (16 * freq) // cycles = (TOP+1) * (CSRPHCorrect + 1) * (DIV_INT + DIV_FRAC/16)
 }
 
 // SetInverting sets whether to invert the output of this channel.

Original file line number	Diff line number	Diff line change
`@@ -153,7 +153,7 @@ func (p *pwmGroup) Period() uint64 {`
`153`	`153`	`top := p.getWrap()`
`154`	`154`	`phc := p.getPhaseCorrect()`
`155`	`155`	`Int, frac := p.getClockDiv()`
`156`		`- return (16uint64(Int) + uint64(frac)) uint64((top+1)(phc+1)1e9) / (16 * freq) // cycles = (TOP+1) * (CSRPHCorrect + 1) * (DIV_INT + DIV_FRAC/16)`
	`156`	`+ return (16uint64(Int) + uint64(frac)) uint64((top+1)(phc+1)) uint64(1e9) / (16 * freq) // cycles = (TOP+1) * (CSRPHCorrect + 1) * (DIV_INT + DIV_FRAC/16)`
`157`	`157`	`}`
`158`	`158`
`159`	`159`	`// SetInverting sets whether to invert the output of this channel.`