signature: add unknown state for binary without signature

Author: Igor-Misic

Bootloader/Inc/signature.h

@@ -50,6 +50,7 @@ typedef enum detectedBinary_ENUM {
     detectedBinary_FIRMWARE_RAM,     //!< Firmware for RAM
     detectedBinary_BOOTLOADER_FLASH, //!< New bootloader for FLASH
     detectedBinary_BOOTLOADER_RAM,   //!< Bootloader for RAM
+    detectedBinary_UNKNOWN,          //!< Not existing or unknown signature
 } detectedBinary_E;
 
 detectedBinary_E Signature_verification(const signature_S* signature);

Bootloader/Src/binary_update.c

@@ -63,10 +63,14 @@ BinaryUpdate_handleDetectedBinary(detectedBinary_E detected_binary) {
             s_address = RAM_FIRMWARE_ADDRESS;
             break;
 
-        default:
+        case detectedBinary_UNKNOWN:
+            //we support unsigned binary but handle it as firmware for flash
             success = false;
             s_address = FLASH_FIRMWARE_ADDRESS;
             break;
+
+        default:
+            break;
     }
 
     return success;
@@ -130,9 +134,12 @@ BinaryUpdate_erase(uint32_t firmware_size) {
         case detectedBinary_BOOTLOADER_RAM:
             break;
 
-        default:
+        case detectedBinary_UNKNOWN:
             success = FlashAdapter_erase(firmware_size, s_address);
             break;
+
+        default:
+            break;
     }
 
     return success;
@@ -195,11 +202,14 @@ BinaryUpdate_finish(void) {
             boot_info.skip_bl_loop = true;
             break;
 
-        default:
+        case detectedBinary_UNKNOWN:
             boot_info.jump_address = FLASH_FIRMWARE_ADDRESS;
             boot_info.skip_bl_loop = false;
             success = FlashAdapter_finish();
             break;
+
+        default:
+            break;
     }
 
     boot_info.previus_binary = s_detected_binary;

Bootloader/Src/signature.c

@@ -59,7 +59,7 @@ Signature_verification(const signature_S* signature) {
     } else if (0 == memcmp(&(signature->magic_key), &bl_ram_signature_magic_key, sizeof(bl_ram_signature_magic_key))) {
         detected_binary = detectedBinary_BOOTLOADER_RAM;
     } else {
-        detected_binary = detectedBinary_FIRMWARE_FLASH;
+        detected_binary = detectedBinary_UNKNOWN;
     }
 
     return detected_binary;