Set bit without reseting the whole register

Author: Nodraak

targets/TARGET_STM/TARGET_STM32F0/can_api.c

@@ -267,10 +267,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if (handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
       /* Release FIFO1 */
-      can->RF1R = CAN_RF1R_RFOM1;
+      can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;

targets/TARGET_STM/TARGET_STM32F1/can_api.c

@@ -270,10 +270,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if(handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
       /* Release FIFO1 */
-      can->RF1R = CAN_RF1R_RFOM1;
+      can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;

targets/TARGET_STM/TARGET_STM32F2/can_api.c

@@ -280,10 +280,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if (handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
         /* Release FIFO1 */
-        can->RF1R = CAN_RF1R_RFOM1;
+        can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;

targets/TARGET_STM/TARGET_STM32F3/can_api.c

@@ -270,10 +270,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if(handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
       /* Release FIFO1 */
-      can->RF1R = CAN_RF1R_RFOM1;
+      can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;

targets/TARGET_STM/TARGET_STM32F4/can_api.c

@@ -283,10 +283,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if(handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
       /* Release FIFO1 */
-      can->RF1R = CAN_RF1R_RFOM1;
+      can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;

targets/TARGET_STM/TARGET_STM32F7/can_api.c

@@ -283,10 +283,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if(handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
       /* Release FIFO1 */
-      can->RF1R = CAN_RF1R_RFOM1;
+      can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;

targets/TARGET_STM/TARGET_STM32L4/can_api.c

@@ -270,10 +270,10 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
     /* Release the FIFO */
     if(handle == CAN_FIFO0) {
         /* Release FIFO0 */
-        can->RF0R = CAN_RF0R_RFOM0;
+        can->RF0R |= CAN_RF0R_RFOM0;
     } else { /* FIFONumber == CAN_FIFO1 */
       /* Release FIFO1 */
-      can->RF1R = CAN_RF1R_RFOM1;
+      can->RF1R |= CAN_RF1R_RFOM1;
     }
 
     return 1;