From a7fc65861dc530e5503a640282e52a286f8b9342 Mon Sep 17 00:00:00 2001
From: deadprogram <ron@hybridgroup.com>
Date: Sat, 19 Nov 2022 19:26:03 +0100
Subject: [PATCH] machine/stm32: always set ADC pins to pullups floating

Signed-off-by: deadprogram <ron@hybridgroup.com>
---
 src/machine/machine_stm32_moder_gpio.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/machine/machine_stm32_moder_gpio.go b/src/machine/machine_stm32_moder_gpio.go
index c1439eb5..99d913cd 100644
--- a/src/machine/machine_stm32_moder_gpio.go
+++ b/src/machine/machine_stm32_moder_gpio.go
@@ -148,6 +148,7 @@ func (p Pin) ConfigureAltFunc(config PinConfig, altFunc uint8) {
 	// ADC
 	case PinInputAnalog:
 		port.MODER.ReplaceBits(gpioModeAnalog, gpioModeMask, pos)
+		port.PUPDR.ReplaceBits(gpioPullFloating, gpioPullMask, pos)
 	}
 }