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fix(rp2): possible integer overflow while computing factors for SPI baudrate

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Incorrect factors are calculated for baudrates which are a bit
larger than integer multiples of 4194304.
For example for baudrates of 8_400_000 or 58_800_000.
Fixed the same way in newer versions of the RPI SDK.
This commit is contained in:
Olaf Flebbe
2025-10-06 23:05:15 +02:00
committed by Ayke
parent aedaf7d925
commit 3be7100e89
1 changed files with 1 additions and 1 deletions
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src/machine/machine_rp2_spi.go
+1 -1
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@@ -108,7 +108,7 @@ func (spi *SPI) SetBaudRate(br uint32) error {
var prescale, postdiv uint32 var prescale, postdiv uint32
freq := CPUFrequency() freq := CPUFrequency()
for prescale = 2; prescale < 255; prescale += 2 { for prescale = 2; prescale < 255; prescale += 2 {
if freq < (prescale+2)*256*br { if uint64(freq) < uint64((prescale+2)*256)*uint64(br) {
break break
} }
} }