Fix relative paths to custom upload method file, fix incorrect CAN length on STMicro (#380)

* Fix relative paths to custom upload method file, fix incorrect CAN length on STMicro

* Wait we can do this better

Author: Jamie Smith

targets/TARGET_STM/can_api.c

@@ -1014,7 +1014,7 @@ int can_write(can_t *obj, CAN_Message msg, int cc)
 int can_read(can_t *obj, CAN_Message *msg, int handle)
 {
     //FIFO selection cannot be controlled by software for STM32, default FIFO is 0, hence handle is not used
-    int rxfifo_default = DEFAULT_RXFIFO; 
+    const int rxfifo_default = DEFAULT_RXFIFO;
     CAN_TypeDef *can = obj->CanHandle.Instance;
 
     // check FPM0 which holds the pending message count in FIFO 0
@@ -1033,7 +1033,7 @@ int can_read(can_t *obj, CAN_Message *msg, int handle)
 
     msg->type = (CANType)(((uint8_t)0x02 & can->sFIFOMailBox[rxfifo_default].RIR) >> 1);
     /* Get the DLC */
-    msg->len = ((uint8_t)0x0F & can->sFIFOMailBox[rxfifo_default].RDTR < 8) ? ((uint8_t)0x0F & can->sFIFOMailBox[rxfifo_default].RDTR) : ((uint8_t) 8);
+    msg->len = ((can->sFIFOMailBox[rxfifo_default].RDTR & CAN_RDT0R_DLC) < 8) ? (CAN_RDT0R_DLC & can->sFIFOMailBox[rxfifo_default].RDTR) : ((uint8_t) 8);
     /* Get the FMI */
     // msg->FMI = (uint8_t)0xFF & (can->sFIFOMailBox[rxfifo_default].RDTR >> 8);
     /* Get the data field */

tools/cmake/app.cmake

@@ -64,6 +64,8 @@ set(EXPECTED_MBED_UPLOAD_CFG_FILE_PATH ${MBED_SOURCE_DIR}/targets/upload_method_
 
 # check if a custom upload config path is defined in top lvl cmake
 if((DEFINED CUSTOM_UPLOAD_CFG_PATH))
+	# Make path absolute, as required by EXISTS
+	get_filename_component(CUSTOM_UPLOAD_CFG_PATH "${CUSTOM_UPLOAD_CFG_PATH}" ABSOLUTE BASE_DIR ${CMAKE_SOURCE_DIR})
     if(EXISTS ${CUSTOM_UPLOAD_CFG_PATH})
         include(${CUSTOM_UPLOAD_CFG_PATH})
         message(STATUS "Mbed: Custom upload config included from ${CUSTOM_UPLOAD_CFG_PATH}")