+/*
+ * PWM output
+ */
+
+#define NUM_PWM 2
+#define PWM_MAX 1023
+#define AO_PWM_TIMER stm_tim4
+#define AO_PWM_TIMER_ENABLE STM_RCC_APB1ENR_TIM4EN
+#define AO_PWM_TIMER_SCALE 1
+
+#define AO_PWM_0_GPIO (&stm_gpiob)
+#define AO_PWM_0_PIN 6
+
+#define AO_PWM_1_GPIO (&stm_gpiob)
+#define AO_PWM_1_PIN 7
+