From f6b5d1838b2c76cf4e5a18509c8fad91dbb01ed9 Mon Sep 17 00:00:00 2001
From: yn386 <wf.yn386@gmail.com>
Date: Sat, 22 Oct 2022 16:19:58 +0900
Subject: [PATCH] stm32/adc: Fix ADCAll.read_core_temp() on L4 MCUs.

TS_CAL1 and TS_CAL2 of STM32L4 are at VDDA=3.0V, so the reference
correction factor should be updated before reading tempsensor.
---
 ports/stm32/adc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ports/stm32/adc.c b/ports/stm32/adc.c
index 5aa7ce426..2df6b7abf 100644
--- a/ports/stm32/adc.c
+++ b/ports/stm32/adc.c
@@ -860,9 +860,9 @@ float adc_read_core_temp_float(ADC_HandleTypeDef *adcHandle) {
         return 0;
     }
     #else
-    #if defined(STM32L1)
+    #if defined(STM32L1) || defined(STM32L4)
     // Update the reference correction factor before reading tempsensor
-    // because TS_CAL1 and TS_CAL2 of STM32L1 are at VDDA=3.0V
+    // because TS_CAL1 and TS_CAL2 of STM32L1/L4 are at VDDA=3.0V
     adc_read_core_vref(adcHandle);
     #endif
     int32_t raw_value = adc_config_and_read_ref(adcHandle, ADC_CHANNEL_TEMPSENSOR);