diff --git a/demos/ARMCM3-STM32F103-GCC/Makefile b/demos/ARMCM3-STM32F103-GCC/Makefile
index eb957c072..0fa07c91a 100644
--- a/demos/ARMCM3-STM32F103-GCC/Makefile
+++ b/demos/ARMCM3-STM32F103-GCC/Makefile
@@ -66,6 +66,7 @@ CSRC = ../../ports/ARMCM3/chcore.c \
        ../../ports/ARMCM3-STM32F103/stm32_serial.c \
        ${KERNSRC} \
        ${TESTSRC} \
+       ../../src/lib/pal.c \
        ../../src/lib/evtimer.c \
        board.c main.c
 
diff --git a/demos/ARMCM3-STM32F103-GCC/main.c b/demos/ARMCM3-STM32F103-GCC/main.c
index f89131d37..f599c3e73 100644
--- a/demos/ARMCM3-STM32F103-GCC/main.c
+++ b/demos/ARMCM3-STM32F103-GCC/main.c
@@ -24,6 +24,8 @@
 #include "board.h"
 #include "stm32_serial.h"
 
+static IOBUS_DECL(LedBus, IOPORT_C, 1, GPIOC_LED);
+
 /*
  * Red LEDs blinker thread, times are in milliseconds.
  */
@@ -35,6 +37,30 @@ static msg_t Thread1(void *arg) {
     chThdSleepMilliseconds(500);
     palSetPad(IOPORT_C, GPIOC_LED);
     chThdSleepMilliseconds(500);
+    palTogglePad(IOPORT_C, GPIOC_LED);
+    chThdSleepMilliseconds(500);
+    palTogglePad(IOPORT_C, GPIOC_LED);
+    chThdSleepMilliseconds(500);
+    palWritePad(IOPORT_C, GPIOC_LED, PAL_LOW);
+    chThdSleepMilliseconds(500);
+    palWritePad(IOPORT_C, GPIOC_LED, PAL_HIGH);
+    chThdSleepMilliseconds(500);
+    palWriteGroup(IOPORT_C, 1, GPIOC_LED, PAL_LOW);
+    chThdSleepMilliseconds(500);
+    palWriteGroup(IOPORT_C, 1, GPIOC_LED, PAL_HIGH);
+    chThdSleepMilliseconds(500);
+    palClearPort(IOPORT_C, PAL_PORT_BIT(GPIOC_LED));
+    chThdSleepMilliseconds(500);
+    palSetPort(IOPORT_C, PAL_PORT_BIT(GPIOC_LED));
+    chThdSleepMilliseconds(500);
+    palTogglePort(IOPORT_C, PAL_PORT_BIT(GPIOC_LED));
+    chThdSleepMilliseconds(500);
+    palTogglePort(IOPORT_C, PAL_PORT_BIT(GPIOC_LED));
+    chThdSleepMilliseconds(500);
+    palWriteBus(&LedBus, PAL_LOW);
+    chThdSleepMilliseconds(500);
+    palWriteBus(&LedBus, PAL_HIGH);
+    chThdSleepMilliseconds(500);
   }
   return 0;
 }
diff --git a/docs/src/main.dox b/docs/src/main.dox
index 24d7acda1..3a38d7115 100644
--- a/docs/src/main.dox
+++ b/docs/src/main.dox
@@ -358,7 +358,7 @@
  * @defgroup PAL I/O Ports Abstraction Layer (PAL)
  * @brief I/O Ports Abstraction Layer
  * @details This module defines an abstract interface for digital I/O ports.
- * Note that I/O ports functions are just a set of macros. The macros
+ * Note that most I/O ports functions are just macros. The macros
  * have default software implementations that can be redefined in a
  * @ref PAL_LLD if the target hardware supports special features like, as
  * example, atomic bit set/reset/masking. Please refer to the ports specific
diff --git a/src/templates/pal_lld.h b/src/templates/pal_lld.h
index d9e492c0b..246ab8d9f 100644
--- a/src/templates/pal_lld.h
+++ b/src/templates/pal_lld.h
@@ -19,7 +19,7 @@
 
 /**
  * @file src/templates/pal_lld.h
- * @brief @ref PAL subsystem low level driver template
+ * @brief PAL subsystem low level driver template
  * @addtogroup PAL_LLD
  * @{
  */