tiam1808/drivers/spi: Round *up* divisor for clock prescaler

ArcaneNibble · ArcaneNibble · commit 0cd2c97d6cd1 · 2025-07-07T15:49:39.000+01:00
This ensures that the specified frequency is never exceeced.
diff --git a/lib/tiam1808/drivers/spi.c b/lib/tiam1808/drivers/spi.c
@@ -59,7 +59,7 @@ void SPIClkConfigure(unsigned int baseAdd, unsigned int moduleClk,
 {
     unsigned int prescale;
 
-    prescale = (moduleClk/spiClk) - 1;
+    prescale = ((moduleClk + spiClk - 1)/spiClk) - 1;
 
     HWREG(baseAdd + SPI_SPIFMT(dataFormat)) =  \
         (SPI_SPIFMT_PRESCALE & (prescale << SPI_SPIFMT_PRESCALE_SHIFT));

Original file line number	Diff line number	Diff line change
`@@ -59,7 +59,7 @@ void SPIClkConfigure(unsigned int baseAdd, unsigned int moduleClk,`
`59`	`59`	`{`
`60`	`60`	`unsigned int prescale;`
`61`	`61`
`62`		`- prescale = (moduleClk/spiClk) - 1;`
	`62`	`+ prescale = ((moduleClk + spiClk - 1)/spiClk) - 1;`
`63`	`63`
`64`	`64`	`HWREG(baseAdd + SPI_SPIFMT(dataFormat)) = \`
`65`	`65`	`(SPI_SPIFMT_PRESCALE & (prescale << SPI_SPIFMT_PRESCALE_SHIFT));`