+/* The stm32f413 implements only 4 bits of the priority fields? */
+
+#if AO_NONMASK_INTERRUPT
+#define AO_STM_NVIC_NONMASK_PRIORITY 0x00
+
+/* Set the basepri register to this value to mask all
+ * non-maskable priorities
+ */
+#define AO_STM_NVIC_BASEPRI_MASK 0x10
+#endif
+
+#define AO_STM_NVIC_HIGH_PRIORITY 0x40
+#define AO_STM_NVIC_MED_PRIORITY 0x80
+#define AO_STM_NVIC_LOW_PRIORITY 0xC0
+#define AO_STM_NVIC_CLOCK_PRIORITY 0xf0
+
+#define AO_GPIO_MODE_PULL_NONE 0
+#define AO_GPIO_MODE_PULL_UP 4
+#define AO_GPIO_MODE_PULL_DOWN 8
+
+/* usart stuff */
+
+#define AO_SERIAL_SPEED_4800 4800
+#define AO_SERIAL_SPEED_9600 9600
+#define AO_SERIAL_SPEED_19200 19200
+#define AO_SERIAL_SPEED_57600 57600
+#define AO_SERIAL_SPEED_115200 115200
+