From bc0a9a6ae4df1d573ab18bde4d6c7b9eb3eb6225 Mon Sep 17 00:00:00 2001
From: Frank Sinapi <frank.sinapi@opentrons.com>
Date: Tue, 31 May 2022 16:22:58 -0400
Subject: [PATCH] chore(thermocycler-gen2): slow fan pwm to 1khz

---
 .../thermocycler-gen2/firmware/thermal/thermal_fan_hardware.c   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stm32-modules/thermocycler-gen2/firmware/thermal/thermal_fan_hardware.c b/stm32-modules/thermocycler-gen2/firmware/thermal/thermal_fan_hardware.c
index 4276d05a8..4c6887881 100644
--- a/stm32-modules/thermocycler-gen2/firmware/thermal/thermal_fan_hardware.c
+++ b/stm32-modules/thermocycler-gen2/firmware/thermal/thermal_fan_hardware.c
@@ -12,7 +12,7 @@
 #define SINK_FAN_PWM_Pin (GPIO_PIN_6)
 #define SINK_FAN_PWM_GPIO_Port (GPIOA)
 
-#define PULSE_WIDTH_FREQ (25000)
+#define PULSE_WIDTH_FREQ (1000)
 #define TIMER_CLOCK_FREQ (170000000)
 // These two together give a 25kHz pulse width, and the ARR value
 // of 99 gives us a nice scale of 0-100 for the pulse width.