<p><b>@kYc0o</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10693#discussion_r263363073">pkg/u8g2/src/csrc/u8x8_riotos.c</a>:</p>
<pre style='color:#555'>> @@ -89,18 +102,18 @@ uint8_t u8x8_gpio_and_delay_riotos(u8x8_t *u8g2, uint8_t msg, uint8_t arg_int, v
             xtimer_nanosleep(arg_int * 100);
             break;
         case U8X8_MSG_GPIO_CS:
-            if (u8g2->pins_enabled & (1 << U8X8_PIN_CS)) {
-                gpio_write(u8g2->pins[U8X8_PIN_CS], arg_int);
+            if (NULL != u8x8_riot_ptr && GPIO_UNDEF != u8x8_riot_ptr->pin_cs) {
</pre>
<p>Maybe you want to add some parenthesis here, it would improve reading and avoid trouble in the future.</p>

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