SPI: restore 12MHz as maximum frequency

facchinm · facchinm · commit aa21f4fe1f0f · 2021-04-07T17:12:37.000+02:00
Fixes #593
diff --git a/libraries/SPI/SPI.cpp b/libraries/SPI/SPI.cpp
@@ -94,8 +94,8 @@ void SPIClass::config(SPISettings settings)
     _p_sercom->disableSPI();
 
     uint32_t clock_freq = settings.getClockFreq();
-    if (clock_freq > F_CPU/2) {
-      clock_freq = F_CPU/2;
+    if (clock_freq > SERCOM_FREQ_REF/SPI_MIN_CLOCK_DIVIDER) {
+      clock_freq = SERCOM_FREQ_REF/SPI_MIN_CLOCK_DIVIDER;
     }
 
     _p_sercom->initSPI(_padTx, _padRx, SPI_CHAR_SIZE_8_BITS, getBitOrder(settings));

Original file line number	Diff line number	Diff line change
`@@ -94,8 +94,8 @@ void SPIClass::config(SPISettings settings)`
`94`	`94`	`_p_sercom->disableSPI();`
`95`	`95`
`96`	`96`	`uint32_t clock_freq = settings.getClockFreq();`
`97`		`- if (clock_freq > F_CPU/2) {`
`98`		`- clock_freq = F_CPU/2;`
	`97`	`+ if (clock_freq > SERCOM_FREQ_REF/SPI_MIN_CLOCK_DIVIDER) {`
	`98`	`+ clock_freq = SERCOM_FREQ_REF/SPI_MIN_CLOCK_DIVIDER;`
`99`	`99`	`}`
`100`	`100`
`101`	`101`	`_p_sercom->initSPI(_padTx, _padRx, SPI_CHAR_SIZE_8_BITS, getBitOrder(settings));`