From 5f57b8543824a743ff31186648ce5128c38b7bed Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sat, 31 Aug 2019 17:12:15 -0600
Subject: [PATCH] arch/arm/src/stm32/stm32_adc.c:  Another fix.  adc_calibrate
 was called even when it was conditioned out, causing a link time failure.

---
 arch/arm/src/stm32/stm32_adc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/src/stm32/stm32_adc.c b/arch/arm/src/stm32/stm32_adc.c
index 44a515a5d6..f408b6ff2d 100644
--- a/arch/arm/src/stm32/stm32_adc.c
+++ b/arch/arm/src/stm32/stm32_adc.c
@@ -2436,6 +2436,8 @@ static void adc_calibrate(FAR struct stm32_dev_s *priv)
 
   adc_modifyreg(priv, STM32_ADC_CR2_OFFSET, ADC_CR2_ADON, 0);
 }
+#else
+#  define adc_calibrate(priv)
 #endif
 
 /****************************************************************************