From b4700a876f20f22eb6981d74ca411cef98372e00 Mon Sep 17 00:00:00 2001
From: Robbe Derks <robbe.derks@gmail.com>
Date: Tue, 1 Aug 2023 20:48:10 -0700
Subject: [PATCH] Stable ADC on H7 (#1540)

* 256x oversampling

* reduce to 128x

* fix misra

---------

Co-authored-by: Comma Device <device@comma.ai>
---
 board/stm32h7/lladc.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/board/stm32h7/lladc.h b/board/stm32h7/lladc.h
index 29d5e19d6..0a52b78d3 100644
--- a/board/stm32h7/lladc.h
+++ b/board/stm32h7/lladc.h
@@ -18,12 +18,12 @@ void adc_init(void) {
 }
 
 uint16_t adc_get_raw(uint8_t channel) {
-
   ADC1->SQR1 &= ~(ADC_SQR1_L);
   ADC1->SQR1 = ((uint32_t) channel << 6U);
 
-  ADC1->SMPR1 = (0x7U << (channel * 3U) );
+  ADC1->SMPR1 = (0x2U << (channel * 3U));
   ADC1->PCSEL_RES0 = (0x1U << channel);
+  ADC1->CFGR2 = (127U << ADC_CFGR2_OVSR_Pos) | (0x7U << ADC_CFGR2_OVSS_Pos) | ADC_CFGR2_ROVSE;
 
   ADC1->CR |= ADC_CR_ADSTART;
   while (!(ADC1->ISR & ADC_ISR_EOC));