Redoing because I misinterpreted function call

platforms/stm32f405/include/can.h

@@ -8,13 +8,16 @@
 #include "stm32f4xx_hal.h"
 #include "stm32f4xx_hal_can.h"
 
+/* function pointer type for the callback */
+typedef void (*can_callback_t)(CAN_HandleTypeDef *hcan);
+
 typedef struct{
 	CAN_HandleTypeDef *hcan;
 	uint16_t *id_list;
 	uint8_t id_list_len;
 
 	/* desired behavior varies by app - so implement this at app level */
-	void (*can_callback)(CAN_HandleTypeDef *hcan);
+	can_callback_t callback;
 } can_t;
 
 typedef struct{
@@ -23,9 +26,6 @@ typedef struct{
 	uint8_t len;
 } can_msg_t;
 
-/* function pointer type for the callback */
-typedef void (*can_callback)(CAN_HandleTypeDef *hcan);
-
 HAL_StatusTypeDef can_init(can_t *can, can_callback callback);
 HAL_StatusTypeDef can_send_msg(can_t *can, can_msg_t *msg);
 

platforms/stm32f405/src/can.c

@@ -1,4 +1,49 @@
 #include "can.h"
+#include <string.h>
+
+/* NOTE: STM32F405 will have MAX of 3 CAN buses */
+#define MAX_CAN_BUS	3
+
+can_t *can_struct_list[MAX_CAN_BUS] = {NULL, NULL, NULL};
+
+static can_callback_t find_callback(CAN_HandleTypeDef *hcan)
+{
+	for (uint8_t i = 0; i < MAX_CAN_BUS; i++) {
+		if (hcan == can_struct_list[i]->hcan)
+			return can_struct_list[i]->callback;
+	}
+	return NULL;
+}
+
+/* Add a CAN interfae to be searched for during the event of a callback */
+static uint8_t add_interface(can_t *interface)
+{
+	for (uint8_t i = 0; i < MAX_CAN_BUS; i++) {
+		/* Interface already added */
+		if (interface->hcan == can_struct_list[i]->hcan)
+			return -1;
+
+		/* If empty, add interface */
+		if (can_struct_list[i]->hcan == NULL) {
+			can_struct_list[i] = interface;
+			return 0;
+		}
+	}
+
+	/* No open slots, something is wrong */
+	return -2;
+}
+
+void HAL_CAN_RxFifo0MsgPendingCallback(CAN_HandleTypeDef *hcan)
+{
+	/* Handle CAN reception event */
+	can_callback_t callback= find_callback(hcan);
+
+	if (callback != NULL)
+	{
+		callback(hcan);
+	}
+}
 
 HAL_StatusTypeDef can_init(can_t *can, can_callback callback)
 {
@@ -41,8 +86,8 @@ HAL_StatusTypeDef can_init(can_t *can, can_callback callback)
 		return err;
 
 	/* Override the default callback for CAN_IT_RX_FIFO0_MSG_PENDING */
-	err = HAL_CAN_ActivateNotification(can->hcan, callback);
-	can->can_callback = callback;
+	err = HAL_CAN_ActivateNotification(can->hcan, CAN_IT_RX_FIFO0_MSG_PENDING);
+	err = add_interface(can);
 
 	return err;
 }