1 files changed, 3 insertions, 2 deletions
diff --git a/demos/ARMCM3-STM32F103-GCC/board.c b/demos/ARMCM3-STM32F103-GCC/board.c
index 38a8e177c..f10269aa6 100644
--- a/demos/ARMCM3-STM32F103-GCC/board.c
+++ b/demos/ARMCM3-STM32F103-GCC/board.c
@@ -81,11 +81,12 @@ void hwinit(void) {
    * NVIC/SCB initialization.
    */
   SCB_AIRCR = AIRCR_VECTKEY | AIRCR_PRIGROUP(0x3); // PRIGROUP 4:0 (4:4).
+  SCB_SHPR(2) = 0xF0 << 16;     // PendSV at lowest priority.
 
   /*
    * SysTick initialization.
    */
-  SCB_SHPR(2) = 0x80 << 24;     // SysTick at priority 8:0.
+  SCB_SHPR(2) |= 0x40 << 24;    // SysTick at priority 4:0.
   ST_RVR = SYSCLK / (8000000 / CH_FREQUENCY) - 1;
   ST_CVR = 0;
   ST_CSR = ENABLE_ON_BITS | TICKINT_ENABLED_BITS | CLKSOURCE_EXT_BITS;
@@ -93,5 +94,5 @@ void hwinit(void) {
   /*
    * Other subsystems initialization.
    */
-  InitSerial(0xA0, 0xA0, 0xA0);
+  InitSerial(0x80, 0x80, 0x80);
 }