Added ICSP functionality to a separate module

Author: yashatmicrochip

secure_boot_and_secure_firmware_upgrade_over_canfd/icsp_inhibit.X/icsp_inhibit.c

@@ -20,16 +20,28 @@
 */
 
 #include <stdbool.h>
+#include "mcc_generated_files/flash/flash.h"
+#include "mcc_generated_files/flash/flash_types.h"
 
-static bool icspEnabled = false;
+static flash_data_t inhibitKeys[4] = 
+{
+    0x00006D63UL, 0x00000000UL, 0x00006870UL, 0x00000000UL
+};
 
-//temp stubs - replace with real implementation
 bool ICSP_INHIBIT_IsEnabled(void)
 {
-    return icspEnabled;
+    static flash_data_t dataInFlash[4];
+    FLASH_Read(0x801034, 4, dataInFlash);
+    
+    if(memcmp(inhibitKeys, dataInFlash, sizeof(inhibitKeys)) == 0)
+    {
+        return true;
+    }
+    return false;
 }
 
-bool ICSP_INHIBIT_Enable()
+void ICSP_INHIBIT_Enable()
 {
-    icspEnabled = true;
+    FLASH_WordWrite(0x801034, &inhibitKeys[0], FLASH_UNLOCK_KEY);
+    FLASH_WordWrite(0x801038, &inhibitKeys[2], FLASH_UNLOCK_KEY); 
 }

secure_boot_and_secure_firmware_upgrade_over_canfd/icsp_inhibit.X/icsp_inhibit.h

@@ -25,6 +25,6 @@
 #include <stdbool.h>
 
 bool ICSP_INHIBIT_IsEnabled(void);
-bool ICSP_INHIBIT_Enable(void);
+void ICSP_INHIBIT_Enable(void);
 
 #endif

secure_boot_and_secure_firmware_upgrade_over_canfd/icsp_inhibit.X/main.c

@@ -62,7 +62,6 @@ static bool errorPresent = false;
 int main(void)
 {
     const char* keyword = "LOCKDEVICE";
-
     SYSTEM_Initialize();
 
     if(WasLoadedByBootloader() == false)
@@ -234,4 +233,4 @@ static uint32_t GetResetAddress()
 static bool WasLoadedByBootloader()
 {
     return (GetResetAddress() < BOOT_CONFIG_PROGRAMMABLE_ADDRESS_LOW);
-}
+}

secure_boot_and_secure_firmware_upgrade_over_canfd/icsp_inhibit.X/nbproject/configurations.xml

@@ -358,6 +358,8 @@
                   value="${memories.instruction.ram.ranges}"/>
         <property key="memories.programmemory" value="true"/>
         <property key="memories.programmemory.ranges" value="0-afeff"/>
+        <property key="programmerToGoFilePath"
+                  value="C:/work/repos/dspic33-dsc-bootloader-code-examples/secure_boot_and_secure_firmware_upgrade_over_canfd/icsp_inhibit.X/debug/default/icsp_inhibit_ptg"/>
         <property key="programoptions.donoteraseauxmem" value="false"/>
         <property key="programoptions.eraseb4program" value="true"/>
         <property key="programoptions.pgmentry.voltage" value="low"/>