Even though the current code seems to be working fine, call KeyMatrix_Init() before InitKeyScanner() just to be sure.

left/src/init_peripherals.c

@@ -10,7 +10,6 @@
 #include "slave_protocol_handler.h"
 #include "i2c_watchdog.h"
 #include "debug_over_spi.h"
-#include "key_scanner.h"
 
 i2c_slave_config_t slaveConfig;
 i2c_slave_handle_t slaveHandle;
@@ -83,7 +82,6 @@ void InitLedDriver(void)
 void InitPeripherals(void)
 {
     InitInterruptPriorities();
-    InitKeyScanner();
     InitLedDriver();
     InitTestLed();
     LedPwm_Init();