Override ADC SAMPLINGTIME in Variant.h

Internal channels need slower ADC sample rate

Author: ppescher

cores/arduino/stm32/analog.c

@@ -50,6 +50,8 @@
 #include "analog.h"
 #include "timer.h"
 #include "PinAF_STM32F1.h"
+// Specific defines in the variant
+#include "variant.h"
 
 #ifdef __cplusplus
  extern "C" {
@@ -69,6 +71,7 @@
 /** @addtogroup STM32F4xx_System_Private_Defines
   * @{
   */
+#ifndef SAMPLINGTIME
 #if defined(ADC_SAMPLETIME_15CYCLES)
 #define SAMPLINGTIME        ADC_SAMPLETIME_15CYCLES;
 #elif defined(ADC_SAMPLETIME_13CYCLES_5)
@@ -82,6 +85,7 @@
 #else
 #error "ADC SAMPLINGTIME could not be defined"
 #endif
+#endif
 
 #ifndef STM32F1xx
 #ifdef ADC_CLOCK_SYNC_PCLK_DIV2

variants/OPENTRACKER_V3/variant.cpp

@@ -132,6 +132,9 @@ PC_0,
 PC_1,
 PC_2,
 PC_3,
+ADC_VREF,
+ADC_VTEMP,
+ADC_VBAT,
 };
 
 #ifdef __cplusplus

variants/OPENTRACKER_V3/variant.h

@@ -148,14 +148,17 @@ PC0_2,
 PC1_2,
 PC2_2,
 PC3_2,
+VREF,
+VTEMP,
+VBAT,
 
   PEND
 };
 
 // This must be a literal with the same value as PEND
 // It is used with preprocessor tests (e.g. #if NUM_DIGITAL_PINS > 3)
 // so an enum will not work.
-#define NUM_DIGITAL_PINS        92
+#define NUM_DIGITAL_PINS        95
 
 // Allow to define Arduino style alias for analog input pin number --> Ax
 // All pins are digital, analog inputs are a subset of digital pins
@@ -173,6 +176,9 @@ PC3_2,
 // First analog pin value (A0) must be greater than or equal to NUM_ANALOG_INPUTS
 #define NUM_ANALOG_FIRST        83
 
+//ADC sampling time
+#define SAMPLINGTIME ADC_SAMPLETIME_640CYCLES_5
+
 //ADC resolution is 12bits
 #define ADC_RESOLUTION          12
 #define DACC_RESOLUTION         12