From: Thomas SCHÖPPING <tschoepp@techfak.uni-bielefeld.de>
Date: Wed, 3 Mar 2015 15:43:17 +0200
Subject: [PATCH] STM32F4xx: added support for the ADC analog watchdog

Signed-off-by: Thomas SCHÖPPING <tschoepp@techfak.uni-bielefeld.de>
---
diff --git a/os/hal/platforms/STM32F4xx/adc_lld.c b/os/hal/platforms/STM32F4xx/adc_lld.c
index e5de44a..5495649 100644
--- a/os/hal/platforms/STM32F4xx/adc_lld.c
+++ b/os/hal/platforms/STM32F4xx/adc_lld.c
@@ -124,7 +124,10 @@ CH_IRQ_HANDLER(ADC1_2_3_IRQHandler) {
     if (ADCD1.grpp != NULL)
       _adc_isr_error_code(&ADCD1, ADC_ERR_OVERFLOW);
   }
-  /* TODO: Add here analog watchdog handling.*/
+  if (sr & ADC_SR_AWD) {
+    if (ADCD1.grpp != NULL)
+      _adc_isr_error_code(&ADCD1, ADC_ERR_WATCHDOG);
+  }
 #endif /* STM32_ADC_USE_ADC1 */
 
 #if STM32_ADC_USE_ADC2
@@ -138,7 +141,10 @@ CH_IRQ_HANDLER(ADC1_2_3_IRQHandler) {
     if (ADCD2.grpp != NULL)
       _adc_isr_error_code(&ADCD2, ADC_ERR_OVERFLOW);
   }
-  /* TODO: Add here analog watchdog handling.*/
+  if (sr & ADC_SR_AWD) {
+    if (ADCD1.grpp != NULL)
+      _adc_isr_error_code(&ADCD2, ADC_ERR_WATCHDOG);
+  }
 #endif /* STM32_ADC_USE_ADC2 */
 
 #if STM32_ADC_USE_ADC3
@@ -152,7 +158,10 @@ CH_IRQ_HANDLER(ADC1_2_3_IRQHandler) {
     if (ADCD3.grpp != NULL)
       _adc_isr_error_code(&ADCD3, ADC_ERR_OVERFLOW);
   }
-  /* TODO: Add here analog watchdog handling.*/
+  if (sr & ADC_SR_AWD) {
+    if (ADCD1.grpp != NULL)
+      _adc_isr_error_code(&ADCD3, ADC_ERR_WATCHDOG);
+  }
 #endif /* STM32_ADC_USE_ADC3 */
 
   CH_IRQ_EPILOGUE();
@@ -340,6 +349,8 @@ void adc_lld_start_conversion(ADCDriver *adcp) {
   adcp->adc->SR    = 0;
   adcp->adc->SMPR1 = grpp->smpr1;
   adcp->adc->SMPR2 = grpp->smpr2;
+  adcp->adc->HTR   = grpp->htr;
+  adcp->adc->LTR   = grpp->ltr;
   adcp->adc->SQR1  = grpp->sqr1;
   adcp->adc->SQR2  = grpp->sqr2;
   adcp->adc->SQR3  = grpp->sqr3;
diff --git a/os/hal/platforms/STM32F4xx/adc_lld.h b/os/hal/platforms/STM32F4xx/adc_lld.h
index 7cda791..be81ed3 100644
--- a/os/hal/platforms/STM32F4xx/adc_lld.h
+++ b/os/hal/platforms/STM32F4xx/adc_lld.h
@@ -306,7 +306,8 @@ typedef uint16_t adc_channels_num_t;
  */
 typedef enum {
   ADC_ERR_DMAFAILURE = 0,                   /**< DMA operations failure.    */
-  ADC_ERR_OVERFLOW = 1                      /**< ADC overflow condition.    */
+  ADC_ERR_OVERFLOW = 1,                     /**< ADC overflow condition.    */
+  ADC_ERR_WATCHDOG = 2                      /**< ADC watchdog condition.    */
 } adcerror_t;
 
 /**
@@ -385,6 +386,16 @@ typedef struct {
    */
   uint32_t                  smpr2;
   /**
+   * @brief   ADC watchdog higher threshold register.
+   * @details This filed defines the higher threshold for the analog watchdog.
+   */
+  uint16_t                  htr;
+  /**
+   * @brief   ADC watchdog lower threshold register.
+   * @details This filed defines the lower threshold for the analog watchdog.
+   */
+  uint16_t                  ltr;
+  /**
    * @brief   ADC SQR1 register initialization data.
    * @details Conversion group sequence 13...16 + sequence length.
    */
@@ -528,6 +539,14 @@ struct ADCDriver {
 #define ADC_SMPR1_SMP_VBAT(n)   ((n) << 24) /**< @brief VBAT sampling time. */
 /** @} */
 
+/**
+ * @name    Threshold settings helper macros
+ * @{
+ */
+#define ADC_HTR(n)              ((n > ADC_HTR_HT) ? ADC_HTR_HT : n) /**< @brief higher threshold limitation */
+#define ADC_LTR(n)              ((n > ADC_LTR_LT) ? ADC_LTR_LT : n) /**< @brief lower threshold limitation  */
+/** @} */
+
 /*===========================================================================*/
 /* External declarations.                                                    */
 /*===========================================================================*/