From 9b83a78a05b532a3d3f4e19ff1d99e501af27dec Mon Sep 17 00:00:00 2001
From: cho45 <cho45@lowreal.net>
Date: Fri, 30 Aug 2019 14:18:29 +0900
Subject: [PATCH] forllow cal adc / enable adc code to manual rev9

---
 adc.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/adc.c b/adc.c
index 04b2f0b..be65e46 100644
--- a/adc.c
+++ b/adc.c
@@ -31,13 +31,26 @@ void adc_init(void)
 {
   rccEnableADC1(FALSE);
 
+  /* Ensure flag states */
+  ADC1->IER = 0;
+
   /* Calibration procedure.*/
   ADC->CCR = 0;
+  if (ADC1->CR & ADC_CR_ADEN) {
+      ADC1->CR |= ~ADC_CR_ADDIS; /* Disable ADC */
+  }
+  while (ADC1->CR & ADC_CR_ADEN)
+    ;
+  ADC1->CFGR1 &= ~ADC_CFGR1_DMAEN;
   ADC1->CR |= ADC_CR_ADCAL;
   while (ADC1->CR & ADC_CR_ADCAL)
     ;
 
-  ADC1->CR = ADC_CR_ADEN;
+  if (ADC1->ISR & ADC_ISR_ADRDY) {
+      ADC1->ISR |= ADC_ISR_ADRDY; /* clear ADRDY */
+  }
+  /* Enable ADC */
+  ADC1->CR |= ADC_CR_ADEN;
   while (!(ADC1->ISR & ADC_ISR_ADRDY))
     ;
 }