commit 4baa1a1b369f2020c21e39c35a493b3a20af6a3b
author YoungSoo Shin <shinys000114@gmail.com> Wed Apr 16 18:04:15 2025 +0900
committer YoungSoo Shin <shinys000114@gmail.com> Wed Apr 30 15:07:02 2025 +0900
tree 34b33e71a190adec2759d3990d2ef6e82e41dfbb
parent 423e0bbcd41e6bbac05bdbb5c52772d78784f950

ODROID-C5: increase analog read buffer size

Signed-off-by: YoungSoo Shin <shinys000114@gmail.com>
Change-Id: Ic8b90557cf9585759559d8869590df0233ba8280

wiringPi/odroidc5.c

diff --git a/wiringPi/odroidc5.c b/wiringPi/odroidc5.c
index c9a8ae5..868d0cc 100644
--- a/wiringPi/odroidc5.c
+++ b/wiringPi/odroidc5.c
@@ -759,7 +759,8 @@
 
 static int _analogRead (int pin)
 {
-	char value[5] = {0,};
+	char value[10] = {0,};
+	int n;
 
 	if (lib->mode == MODE_GPIO_SYS)
 		return	-1;
@@ -789,11 +790,14 @@
 		return 0;
 
 	lseek (adcFds [pin], 0L, SEEK_SET);
-	if (read(adcFds [pin], &value[0], 4) < 0) {
+	n = read(adcFds [pin], &value[0], 10);
+	if (n < 0) {
 		msg(MSG_WARN, "%s: Error occurs when it reads from ADC file descriptor. \n", __func__);
 		return -1;
 	}
 
+	value[n] = 0;
+
 	return	atoi(value);
 }