replace systemInit with its contents, so we can remove unnecessary code here

firmware/main.c

@@ -14,7 +14,13 @@ void wrapper(void);
 
 int main(void) {
     // Configure cpu and mandatory peripherals
-    systemInit();
+    cpuInit();                                // Configure the CPU
+// we do it later
+//    systickInit(CFG_SYSTICK_DELAY_IN_MS);     // Start systick timer
+// cpuInit already calls this
+//    gpioInit();                               // Enable GPIO 
+    pmuInit();                                // Configure power management
+    adcInit();                                // Config adc pins to save power
 
     // initialise basic badge functions
     rbInit();