crc for ploc update

README.md

@@ -926,7 +926,7 @@ candump can0
 
 ## Dump content of file in hex
 ````
-cat file.bin | hexdump
+cat file.bin | hexdump -C
 ````
 
 ## Preparation of a fresh rootfs and SD card

bsp_q7s/devices/PlocUpdater.cpp

@@ -292,7 +292,7 @@ void PlocUpdater::commandUpdateAvailable() {
     remainingPackets = numOfUpdatePackets;
     packetsSent = 0;
 
-    uint32_t imageCrc = makeCrc();
+    calcImageCrc();
 
     PLOC_SPV::UpdateInfo packet(PLOC_SPV::APID_UPDATE_AVAILABLE, static_cast<uint8_t>(updateMemory),
             static_cast<uint8_t>(updatePartition), imageSize, imageCrc, numOfUpdatePackets);
@@ -338,7 +338,7 @@ void PlocUpdater::commandUpdatePacket() {
     file.close();
     // sequence count of first packet is 1
     packet.setPacketSequenceCount((packetsSent + 1) & PLOC_SPV::SEQUENCE_COUNT_MASK);
-    if (numOfUpdatePackets > 0) {
+    if (numOfUpdatePackets > 1) {
         adjustSequenceFlags(packet);
     }
     packet.makeCrc();
@@ -383,9 +383,27 @@ void PlocUpdater::commandUpdateVerify() {
     return;
 }
 
-ReturnValue_t PlocUpdater::makeCrc() {
-    //TODO: Waiting on input from TAS about the CRC to use
-    return 0;
+void PlocUpdater::calcImageCrc() {
+    std::ifstream file(updateFile, std::ifstream::binary);
+    file.seekg(0, file.end);
+    uint32_t count;
+    uint32_t bit;
+    uint32_t remainder = INITIAL_REMAINDER_32;
+    char input;
+    for (count = 0; count < imageSize; count++) {
+        file.seekg(count, file.beg);
+        file.read(&input, 1);
+        remainder ^= (input << 16);
+        for (bit = 8; bit > 0; --bit) {
+            if (remainder & TOPBIT_32) {
+                remainder = (remainder << 1) ^ POLYNOMIAL_32;
+            } else {
+                remainder = (remainder << 1);
+            }
+        }
+    }
+    file.close();
+    imageCrc = (remainder ^ FINAL_XOR_VALUE_32);
 }
 
 void PlocUpdater::adjustSequenceFlags(PLOC_SPV::UpdatePacket& packet) {

bsp_q7s/devices/PlocUpdater.h

@@ -92,6 +92,11 @@ private:
     // Maximum size of update payload data per space packet (max size of space packet is 1024 bytes)
     static const size_t MAX_SP_DATA = 1016;
 
+    static const uint32_t TOPBIT_32 = (1 << 31);
+    static const uint32_t POLYNOMIAL_32 = 0x04C11DB7;
+    static const uint32_t INITIAL_REMAINDER_32 = 0xFFFFFFFF;
+    static const uint32_t FINAL_XOR_VALUE_32 = 0xFFFFFFFF;
+
     MessageQueueIF* commandQueue = nullptr;
 
 #if BOARD_TE0720 == 0
@@ -168,7 +173,7 @@ private:
     bool isSdCardMounted(sd::SdCard sdCard);
 #endif
 
-    ReturnValue_t makeCrc();
+    void calcImageCrc();
 
     void adjustSequenceFlags(PLOC_SPV::UpdatePacket& packet);
 };

bsp_q7s/devices/devicedefinitions/PlocSupervisorDefinitions.h

@@ -1453,7 +1453,7 @@ public:
     UpdateInfo(uint16_t apid, uint8_t memory, uint8_t partition, uint32_t imageSize,
             uint32_t imageCrc, uint32_t numPackets) :
             SupvTcSpacePacket(PAYLOAD_LENGTH, apid), memory(memory), partition(partition), imageSize(
-                    imageSize), numPackets(numPackets) {
+                    imageSize), imageCrc(imageCrc), numPackets(numPackets) {
         initPacket();
         makeCrc();
     }