Merge pull request #3348 from TomoYamanaka/master

Fix frequency function of CAN driver.

Author: sg-

targets/TARGET_RENESAS/TARGET_RZ_A1H/can_api.c

@@ -581,6 +581,7 @@ void can_free(can_t *obj) {
 }
 
 int can_frequency(can_t *obj, int f) {
+    __IO uint32_t *dmy_cfcc;
     int retval = 0;
 
     if (f <= 1000000) {
@@ -590,6 +591,12 @@ int can_frequency(can_t *obj, int f) {
         can_set_frequency(obj, f);
         /* set Channel Communication mode */
         can_set_channel_mode(obj->ch, CH_COMM);
+        /* restore  CFE bit since it is cleared */
+        /* Use send/receive FIFO buffer */
+        dmy_cfcc = CFCC_TBL[obj->ch][CAN_SEND];
+        *dmy_cfcc |= 0x01;
+        dmy_cfcc = CFCC_TBL[obj->ch][CAN_RECV];
+        *dmy_cfcc |= 0x01;
         retval = 1;
     }
 

targets/TARGET_RENESAS/TARGET_VK_RZ_A1H/can_api.c

@@ -598,6 +598,7 @@ void can_free(can_t *obj) {
 }
 
 int can_frequency(can_t *obj, int f) {
+    __IO uint32_t *dmy_cfcc;
     int retval = 0;
 
     if (f <= 1000000) {
@@ -607,6 +608,12 @@ int can_frequency(can_t *obj, int f) {
         can_set_frequency(obj, f);
         /* set Channel Communication mode */
         can_set_channel_mode(obj->ch, CH_COMM);
+        /* restore  CFE bit since it is cleared */
+        /* Use send/receive FIFO buffer */
+        dmy_cfcc = CFCC_TBL[obj->ch][CAN_SEND];
+        *dmy_cfcc |= 0x01;
+        dmy_cfcc = CFCC_TBL[obj->ch][CAN_RECV];
+        *dmy_cfcc |= 0x01;
         retval = 1;
     }