From 4c274bd06aa5310823fe1683f63b0c47b7a277d4 Mon Sep 17 00:00:00 2001
From: Bruce Luckcuck <github@etracer.net>
Date: Sat, 30 Mar 2019 18:56:54 -0400
Subject: [PATCH] Fix F1 compile errors

---
 src/main/drivers/pwm_output.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/drivers/pwm_output.c b/src/main/drivers/pwm_output.c
index 8297ada06..e08be8c7a 100644
--- a/src/main/drivers/pwm_output.c
+++ b/src/main/drivers/pwm_output.c
@@ -687,7 +687,11 @@ void beeperPwmInit(const ioTag_t tag, uint16_t frequency)
     if (beeperIO && timer) {
         beeperPwm.io = beeperIO;
         IOInit(beeperPwm.io, OWNER_BEEPER, RESOURCE_INDEX(0));
+#if defined(STM32F1)
+        IOConfigGPIO(beeperPwm.io, IOCFG_AF_PP);
+#else
         IOConfigGPIOAF(beeperPwm.io, IOCFG_AF_PP, timer->alternateFunction);
+#endif
         freqBeep = frequency;
         pwmOutConfig(&beeperPwm.channel, timer, PWM_TIMER_1MHZ, PWM_TIMER_1MHZ / freqBeep, (PWM_TIMER_1MHZ / freqBeep) / 2, 0);