fix CI check errors

dist/tools/doccheck/exclude_simple

@@ -8424,3 +8424,5 @@ warning: Member LSM6DSXX_PARAM_GYRO_FIFO_DEC (macro definition) of file lsm6dsxx
 warning: Member LSM6DSXX_PARAMS (macro definition) of file lsm6dsxx_params.h is not documented.
 warning: Member LSM6DSXX_SAUL_INFO (macro definition) of file lsm6dsxx_params.h is not documented.
 RIOTDoxygenLayout.xml:8: warning: the type 'topics' is not supported for the entry tag within a navindex! Check your layout file!
+Error: Member stby_pin (variable) of struct at6561_trx is not documented.
+Error: Member trx (variable) of struct at6561_trx is not documented.

drivers/at6561/at6561.c

@@ -25,38 +25,38 @@ static int _init(can_trx_t *can_trx);
 static int _set_mode(can_trx_t *can_trx, can_trx_mode_t mode);
 
 const trx_driver_t at6561_driver = {
-	.init = _init,
-	.set_mode = _set_mode,
+    .init = _init,
+    .set_mode = _set_mode,
 };
 
 static int _init(can_trx_t *can_trx)
 {
-	at6561_trx_t *dev = container_of(can_trx, at6561_trx_t, trx);
+    at6561_trx_t *dev = container_of(can_trx, at6561_trx_t, trx);
 
-	gpio_init(dev->stby_pin, GPIO_OUT);
-	/* A high level on the standby pin of the CAN transceiver will
-		select the standby mode. Check AT6560/1 datasheet, table 1-1 */
-	gpio_set(dev->stby_pin);
+    gpio_init(dev->stby_pin, GPIO_OUT);
+    /* A high level on the standby pin of the CAN transceiver will
+        select the standby mode. Check AT6560/1 datasheet, table 1-1 */
+    gpio_set(dev->stby_pin);
 
-	return 1;
+    return 1;
 }
 
 /* Set the mode of the CAN transceiver */
 static int _set_mode(can_trx_t *can_trx, can_trx_mode_t mode)
 {
-	at6561_trx_t *dev = container_of(can_trx, at6561_trx_t, trx);
-
-	/* Check AT6560/1 datasheet, table 1-1 */
-	switch (mode) {
-		case TRX_NORMAL_MODE:
-			gpio_clear(dev->stby_pin);
-			break;
-		case TRX_SLEEP_MODE:
-			gpio_set(dev->stby_pin);
-			break;
-		default:
-			assert(0);
-	}
-
-	return 1;
+    at6561_trx_t *dev = container_of(can_trx, at6561_trx_t, trx);
+
+    /* Check AT6560/1 datasheet, table 1-1 */
+    switch (mode) {
+        case TRX_NORMAL_MODE:
+            gpio_clear(dev->stby_pin);
+            break;
+        case TRX_SLEEP_MODE:
+            gpio_set(dev->stby_pin);
+            break;
+        default:
+            assert(0);
+    }
+
+    return 1;
 }

drivers/include/at6561.h

@@ -15,18 +15,33 @@
  * @author          Firas Hamdi <firas.hamdi@ml-pa.com>
  */
 
+#ifndef AT6561_H
+#define AT6561_H
+
 #include "periph/gpio.h"
 #include "can/can_trx.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @brief AT6561 CAN transceiver descriptor
  */
 typedef struct at6561_trx {
-	/* AT6561 standby pin */
-	gpio_t stby_pin;
-	/* AT6561 interface */
-	can_trx_t trx;
+    /* AT6561 standby pin */
+    gpio_t stby_pin;
+    /* AT6561 interface */
+    can_trx_t trx;
 } at6561_trx_t;
 
-/* AT6561 driver */
-extern const trx_driver_t at6561_driver;
+/**
+ * @brief AT6561 driver
+ */
+extern const trx_driver_t at6561_driver;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AT6561_H */