core: Limit the value of analog(Read|Write)Resolution

soburi · soburi · commit 640c9a13e0eb · 2026-04-21T19:36:47.000+09:00
If the value of analogWriteResolution is 0, there is a risk of
division by zero in max64 processing, so the value is limited.

Signed-off-by: TOKITA Hiroshi &lt;tokita.hiroshi@gmail.com&gt;
diff --git a/cores/arduino/zephyrCommon.cpp b/cores/arduino/zephyrCommon.cpp
@@ -461,7 +461,7 @@ unsigned long millis(void) {
 static int _analog_write_resolution = 8;
 
 void analogWriteResolution(int bits) {
-	_analog_write_resolution = bits;
+	_analog_write_resolution = CLAMP(bits, 1, 31);
 }
 
 int analogWriteResolution() {
@@ -561,7 +561,7 @@ void __attribute__((weak)) analogReference(uint8_t mode) {
 static int read_resolution = 10;
 
 void analogReadResolution(int bits) {
-	read_resolution = bits;
+	read_resolution = CLAMP(bits, 1, 31);
 }
 
 int analogReadResolution() {

Original file line number	Diff line number	Diff line change
`@@ -461,7 +461,7 @@ unsigned long millis(void) {`
`461`	`461`	`static int _analog_write_resolution = 8;`
`462`	`462`
`463`	`463`	`void analogWriteResolution(int bits) {`
`464`		`- _analog_write_resolution = bits;`
	`464`	`+ _analog_write_resolution = CLAMP(bits, 1, 31);`
`465`	`465`	`}`
`466`	`466`
`467`	`467`	`int analogWriteResolution() {`
`@@ -561,7 +561,7 @@ void __attribute__((weak)) analogReference(uint8_t mode) {`
`561`	`561`	`static int read_resolution = 10;`
`562`	`562`
`563`	`563`	`void analogReadResolution(int bits) {`
`564`		`- read_resolution = bits;`
	`564`	`+ read_resolution = CLAMP(bits, 1, 31);`
`565`	`565`	`}`
`566`	`566`
`567`	`567`	`int analogReadResolution() {`