diff --git a/demos/ARMCM3-STM32F100-DISCOVERY/main.c b/demos/ARMCM3-STM32F100-DISCOVERY/main.c
index 2e1867fae..2859b77cf 100644
--- a/demos/ARMCM3-STM32F100-DISCOVERY/main.c
+++ b/demos/ARMCM3-STM32F100-DISCOVERY/main.c
@@ -47,6 +47,7 @@ static const ADCConversionGroup adcgrpcfg = {
   FALSE,
   ADC_GRP1_NUM_CHANNELS,
   adccb,
+  NULL,
   /* HW dependent part.*/
   0,
   ADC_CR2_TSVREFE,
diff --git a/demos/ARMCM3-STM32F100-DISCOVERY/mcuconf.h b/demos/ARMCM3-STM32F100-DISCOVERY/mcuconf.h
index 9e0ba2cab..ed8116482 100644
--- a/demos/ARMCM3-STM32F100-DISCOVERY/mcuconf.h
+++ b/demos/ARMCM3-STM32F100-DISCOVERY/mcuconf.h
@@ -135,7 +135,7 @@
 #define STM32_PWM_USE_ADVANCED              FALSE
 #define STM32_PWM_USE_TIM1                  FALSE
 #define STM32_PWM_USE_TIM2                  FALSE
-#define STM32_PWM_USE_TIM3                  FALSE
+#define STM32_PWM_USE_TIM3                  TRUE
 #define STM32_PWM_USE_TIM4                  FALSE
 #define STM32_PWM_USE_TIM5                  FALSE
 #define STM32_PWM_USE_TIM8                  FALSE
@@ -154,8 +154,8 @@
 /*
  * SERIAL driver system settings.
  */
-#define STM32_SERIAL_USE_USART1             FALSE
-#define STM32_SERIAL_USE_USART2             TRUE
+#define STM32_SERIAL_USE_USART1             TRUE
+#define STM32_SERIAL_USE_USART2             FALSE
 #define STM32_SERIAL_USE_USART3             FALSE
 #define STM32_SERIAL_USE_UART4              FALSE
 #define STM32_SERIAL_USE_UART5              FALSE
@@ -170,7 +170,7 @@
 /*
  * SPI driver system settings.
  */
-#define STM32_SPI_USE_SPI1                  FALSE
+#define STM32_SPI_USE_SPI1                  TRUE
 #define STM32_SPI_USE_SPI2                  FALSE
 #define STM32_SPI_USE_SPI3                  FALSE
 #define STM32_SPI_SPI1_DMA_PRIORITY         1