[ADC] Internal channels reset after read

fpistm · fpistm · commit ef20dc86243f · 2019-06-11T09:28:02.000+02:00
Internal channels use is enabling ADC "internal path"
which needs to be disabled after measurement

Signed-off-by: Frederic Pillon &lt;frederic.pillon@st.com&gt;
diff --git a/cores/arduino/stm32/analog.c b/cores/arduino/stm32/analog.c
@@ -39,6 +39,7 @@
 #include "analog.h"
 #include "timer.h"
 #include "PinAF_STM32F1.h"
+#include "stm32yyxx_ll_adc.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -809,6 +810,8 @@ uint16_t adc_read_value(PinName pin)
     return 0;
   }
 
+  LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(AdcHandle.Instance), LL_ADC_PATH_INTERNAL_NONE);
+
   return uhADCxConvertedValue;
 }
 #endif /* HAL_ADC_MODULE_ENABLED */

Original file line number	Diff line number	Diff line change
`@@ -39,6 +39,7 @@`
`39`	`39`	`#include "analog.h"`
`40`	`40`	`#include "timer.h"`
`41`	`41`	`#include "PinAF_STM32F1.h"`
	`42`	`+#include "stm32yyxx_ll_adc.h"`
`42`	`43`
`43`	`44`	`#ifdef __cplusplus`
`44`	`45`	`extern "C" {`
`@@ -809,6 +810,8 @@ uint16_t adc_read_value(PinName pin)`
`809`	`810`	`return 0;`
`810`	`811`	`}`
`811`	`812`
	`813`	`+ LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(AdcHandle.Instance), LL_ADC_PATH_INTERNAL_NONE);`
	`814`	`+`
`812`	`815`	`return uhADCxConvertedValue;`
`813`	`816`	`}`
`814`	`817`	`#endif /* HAL_ADC_MODULE_ENABLED */`