From d1e6b0befbc82e108fb3b7fcb2945c2af0ac1629 Mon Sep 17 00:00:00 2001
From: Tom Pittenger <tom.pittenger@KrausAerospace.com>
Date: Thu, 4 Feb 2021 15:22:41 -0800
Subject: [PATCH] AP_HAL_ChibiOS: Add ADC1 support to STM32F3

This is useful for AP_Periph battery monitoring
---
 libraries/AP_HAL_ChibiOS/AnalogIn.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_HAL_ChibiOS/AnalogIn.cpp b/libraries/AP_HAL_ChibiOS/AnalogIn.cpp
index abe3ca253b..8e19bcae70 100644
--- a/libraries/AP_HAL_ChibiOS/AnalogIn.cpp
+++ b/libraries/AP_HAL_ChibiOS/AnalogIn.cpp
@@ -209,7 +209,7 @@ void AnalogIn::init()
     adcgrpcfg.circular = true;
     adcgrpcfg.num_channels = ADC_GRP1_NUM_CHANNELS;
     adcgrpcfg.end_cb = adccallback;
-#if defined(STM32H7)
+#if defined(STM32H7) || defined(STM32F3)
     // use 12 bits resolution to keep scaling factors the same as other boards.
     // todo: enable oversampling in cfgr2 ?
     adcgrpcfg.cfgr = ADC_CFGR_CONT | ADC_CFGR_RES_12BITS;
@@ -231,6 +231,16 @@ void AnalogIn::init()
         } else {
             adcgrpcfg.sqr[2] |= chan << (6*(i-9));
         }
+#elif defined(STM32F3)
+        adcgrpcfg.smpr[chan/10] |= ADC_SMPR_SMP_601P5 << (3*(chan%10));
+        // setup channel sequence
+        if (i < 4) {
+            adcgrpcfg.sqr[0] |= chan << (6*(i+1));
+        } else if (i < 9) {
+            adcgrpcfg.sqr[1] |= chan << (6*(i-4));
+        } else {
+            adcgrpcfg.sqr[2] |= chan << (6*(i-9));
+        }
 #else
         if (chan < 10) {
             adcgrpcfg.smpr2 |= ADC_SAMPLE_480 << (3*chan);