Fix crash related to ADC timeout

ports/stm32f4/common-hal/analogio/AnalogIn.c

@@ -118,7 +118,8 @@ uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
 
     HAL_ADC_Start(&AdcHandle);
-    HAL_ADC_PollForConversion(&AdcHandle,1); //timeout in ms
+    HAL_ADC_PollForConversion(&AdcHandle,1); //doesn't work as HAL_GetTick always returns 0
+    //uint32_t tickstart = ticks_ms;
     uint16_t uhADCxConvertedData = (uint16_t)HAL_ADC_GetValue(&AdcHandle);
     HAL_ADC_Stop(&AdcHandle);
 

ports/stm32f4/tick.c

@@ -54,6 +54,11 @@ void SysTick_Handler(void) {
 #endif
 }
 
+uint32_t HAL_GetTick(void) //override ST HAL
+{
+  return (uint32_t)ticks_ms;
+}
+
 void tick_init() {
     uint32_t ticks_per_ms = SystemCoreClock/ 1000;
     SysTick_Config(ticks_per_ms); // interrupt is enabled