From 37c1c4a66d09160fe4b0f8dfa3cf2eafaa915a97 Mon Sep 17 00:00:00 2001
From: Morgan Diepart <morgandiepart@gmail.com>
Date: Sun, 28 Jan 2024 22:44:14 +0100
Subject: [PATCH] Module17: added VBat measurement to ADC1 driver

---
 platform/drivers/ADC/ADC1_Mod17.c | 15 ++++++++++++++-
 platform/drivers/ADC/ADC1_Mod17.h |  1 +
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/platform/drivers/ADC/ADC1_Mod17.c b/platform/drivers/ADC/ADC1_Mod17.c
index d1e6d7d87..c66a8afa9 100644
--- a/platform/drivers/ADC/ADC1_Mod17.c
+++ b/platform/drivers/ADC/ADC1_Mod17.c
@@ -64,15 +64,28 @@ void adc1_terminate()
 
 uint16_t adc1_getRawSample(uint8_t ch)
 {
-    if(ch > 15) return 0;
+    if(ch > 18)
+        return 0;
 
     pthread_mutex_lock(&adcMutex);
 
+    /* Channel 18 is Vbat, enable it if requested */
+    if(ch == 18)
+        ADC123_COMMON->CCR |= ADC_CCR_VBATE;
+
+
     ADC1->SQR3 = ch;
     ADC1->CR2 |= ADC_CR2_SWSTART;
     while((ADC1->SR & ADC_SR_EOC) == 0) ;
     uint16_t value = ADC1->DR;
 
+    /* Disconnect Vbat channel. Vbat has an internal x2 voltage divider */
+    if(ch == 18)
+    {
+        value *= 2;
+        ADC123_COMMON->CCR &= ~ADC_CCR_VBATE;
+    }
+
     pthread_mutex_unlock(&adcMutex);
 
     return value;
diff --git a/platform/drivers/ADC/ADC1_Mod17.h b/platform/drivers/ADC/ADC1_Mod17.h
index 8eb833818..ee13a0332 100644
--- a/platform/drivers/ADC/ADC1_Mod17.h
+++ b/platform/drivers/ADC/ADC1_Mod17.h
@@ -35,6 +35,7 @@ enum adcCh
 {
     ADC_HWVER_CH     = 3,
     ADC_HMI_HWVER_CH = 13,
+    ADC_VBAT_CH      = 18
 };
 
 /**