[HAL][FDCAN] Better performance by removing multiple volatile reads or writes in interrupt handler

Inc/stm32l5xx_hal_fdcan.h

diff --git a/Inc/stm32l5xx_hal_fdcan.h b/Inc/stm32l5xx_hal_fdcan.h
index 835723e..710c6f4 100644
--- a/Inc/stm32l5xx_hal_fdcan.h
+++ b/Inc/stm32l5xx_hal_fdcan.h
@@ -1414,6 +1414,10 @@
                                      ((OPERATION) == FDCAN_TIMEOUT_TX_EVENT_FIFO) || \
                                      ((OPERATION) == FDCAN_TIMEOUT_RX_FIFO0     ) || \
                                      ((OPERATION) == FDCAN_TIMEOUT_RX_FIFO1     ))
+
+#define FDCAN_CHECK_IT_SOURCE(__IE__, __IT__)  ((((__IE__) & (__IT__)) == (__IT__)) ? SET : RESET)
+
+#define FDCAN_CHECK_FLAG(__IR__, __FLAG__) ((((__IR__) & (__FLAG__)) == (__FLAG__)) ? SET : RESET)
 /**
   * @}
   */

Src/stm32l5xx_hal_fdcan.c

diff --git a/Src/stm32l5xx_hal_fdcan.c b/Src/stm32l5xx_hal_fdcan.c
index a70147f..ff550c8 100644
--- a/Src/stm32l5xx_hal_fdcan.c
+++ b/Src/stm32l5xx_hal_fdcan.c
@@ -2879,6 +2879,8 @@
   uint32_t ErrorStatusITs;
   uint32_t TransmittedBuffers;
   uint32_t AbortedBuffers;
+  uint32_t itsource;
+  uint32_t itflag;
 
   TxEventFifoITs = hfdcan->Instance->IR & FDCAN_TX_EVENT_FIFO_MASK;
   TxEventFifoITs &= hfdcan->Instance->IE;
@@ -2890,11 +2892,13 @@
   Errors &= hfdcan->Instance->IE;
   ErrorStatusITs = hfdcan->Instance->IR & FDCAN_ERROR_STATUS_MASK;
   ErrorStatusITs &= hfdcan->Instance->IE;
+  itsource = hfdcan->Instance->IE;
+  itflag = hfdcan->Instance->IR;
 
   /* High Priority Message interrupt management *******************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_RX_HIGH_PRIORITY_MSG) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_RX_HIGH_PRIORITY_MSG) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_RX_HIGH_PRIORITY_MSG) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_RX_HIGH_PRIORITY_MSG) != RESET)
     {
       /* Clear the High Priority Message flag */
       __HAL_FDCAN_CLEAR_FLAG(hfdcan, FDCAN_FLAG_RX_HIGH_PRIORITY_MSG);
@@ -2910,9 +2914,9 @@
   }
 
   /* Transmission Abort interrupt management **********************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_TX_ABORT_COMPLETE) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_TX_ABORT_COMPLETE) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_TX_ABORT_COMPLETE) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_TX_ABORT_COMPLETE) != RESET)
     {
       /* List of aborted monitored buffers */
       AbortedBuffers = hfdcan->Instance->TXBCF;
@@ -2977,9 +2981,9 @@
   }
 
   /* Tx FIFO empty interrupt management ***************************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_TX_FIFO_EMPTY) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_TX_FIFO_EMPTY) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_TX_FIFO_EMPTY) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_TX_FIFO_EMPTY) != RESET)
     {
       /* Clear the Tx FIFO empty flag */
       __HAL_FDCAN_CLEAR_FLAG(hfdcan, FDCAN_FLAG_TX_FIFO_EMPTY);
@@ -2995,9 +2999,9 @@
   }
 
   /* Transmission Complete interrupt management *******************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_TX_COMPLETE) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_TX_COMPLETE) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_TX_COMPLETE) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_TX_COMPLETE) != RESET)
     {
       /* List of transmitted monitored buffers */
       TransmittedBuffers = hfdcan->Instance->TXBTO;
@@ -3017,9 +3021,9 @@
   }
 
   /* Timestamp Wraparound interrupt management ********************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_TIMESTAMP_WRAPAROUND) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_TIMESTAMP_WRAPAROUND) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_TIMESTAMP_WRAPAROUND) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_TIMESTAMP_WRAPAROUND) != RESET)
     {
       /* Clear the Timestamp Wraparound flag */
       __HAL_FDCAN_CLEAR_FLAG(hfdcan, FDCAN_FLAG_TIMESTAMP_WRAPAROUND);
@@ -3035,9 +3039,9 @@
   }
 
   /* Timeout Occurred interrupt management ************************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_TIMEOUT_OCCURRED) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_TIMEOUT_OCCURRED) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_TIMEOUT_OCCURRED) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_TIMEOUT_OCCURRED) != RESET)
     {
       /* Clear the Timeout Occurred flag */
       __HAL_FDCAN_CLEAR_FLAG(hfdcan, FDCAN_FLAG_TIMEOUT_OCCURRED);
@@ -3053,9 +3057,9 @@
   }
 
   /* Message RAM access failure interrupt management **************************/
-  if (__HAL_FDCAN_GET_FLAG(hfdcan, FDCAN_FLAG_RAM_ACCESS_FAILURE) != 0U)
+  if (FDCAN_CHECK_FLAG(itflag, FDCAN_FLAG_RAM_ACCESS_FAILURE) != RESET)
   {
-    if (__HAL_FDCAN_GET_IT_SOURCE(hfdcan, FDCAN_IT_RAM_ACCESS_FAILURE) != 0U)
+    if (FDCAN_CHECK_IT_SOURCE(itsource, FDCAN_IT_RAM_ACCESS_FAILURE) != RESET)
     {
       /* Clear the Message RAM access failure flag */
       __HAL_FDCAN_CLEAR_FLAG(hfdcan, FDCAN_FLAG_RAM_ACCESS_FAILURE);