Set IOError in __spidev_set_mode if readback differs

This fixes doceme#108
tim-seoss · Sep 8, 2020 · d8725c4 · d8725c4
1 parent a5d82b8
commit d8725c4
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/spidev_module.c b/spidev_module.c
@@ -902,6 +902,9 @@ static int __spidev_set_mode( int fd, __u8 mode) {
 		return -1;
 	}
 	if (test != mode) {
+		PyErr_Format(PyExc_IOError,
+			"Attempted to set mode 0x%x but mode 0x%x returned",
+			(unsigned int)mode, (unsigned int)test);
 		return -1;
 	}
 	return 0;