More warning fixes in the STM32 drvier, STM32 test project and the library core

libuavcan/include/uavcan/marshal/array.hpp

@@ -56,7 +56,7 @@ protected:
         throw std::out_of_range("uavcan::Array");
 #else
         UAVCAN_ASSERT(0);
-        return Size - 1;  // Ha ha
+        return SizeType(Size - 1U);  // Ha ha
 #endif
     }
 };
@@ -87,7 +87,7 @@ protected:
         throw std::out_of_range("uavcan::Array");
 #else
         UAVCAN_ASSERT(0);
-        return (size_ == 0) ? 0 : (size_ - 1);
+        return SizeType((size_ == 0U) ? 0U : (size_ - 1U));
 #endif
     }
 

libuavcan/include/uavcan/transport/crc.hpp

@@ -42,16 +42,16 @@ public:
 #if UAVCAN_TINY
     void add(uint8_t byte)
     {
-        value_ ^= static_cast<uint16_t>(byte) << 8;
+        value_ ^= uint16_t(uint16_t(byte) << 8);
         for (uint8_t bit = 8; bit > 0; --bit)
         {
             if (value_ & 0x8000U)
             {
-                value_ = (value_ << 1) ^ 0x1021U;
+                value_ = uint16_t(uint16_t(value_ << 1) ^ 0x1021U);
             }
             else
             {
-                value_ = (value_ << 1);
+                value_ = uint16_t(value_ << 1);
             }
         }
     }

libuavcan/src/transport/uc_frame.cpp

@@ -141,7 +141,7 @@ bool Frame::compile(CanFrame& out_can_frame) const
     {
     case TransferTypeMessageBroadcast:
     {
-        out_can_frame.dlc = payload_len_;
+        out_can_frame.dlc = uint8_t(payload_len_);
         (void)copy(payload_, payload_ + payload_len_, out_can_frame.data);
         break;
     }