diff --git a/left/src/debug_over_spi.c b/left/src/debug_over_spi.c
index b009a22..b161f6a 100644
--- a/left/src/debug_over_spi.c
+++ b/left/src/debug_over_spi.c
@@ -20,7 +20,9 @@ static volatile bool masterFinished = false;
 
 static void masterCallback(SPI_Type *base, spi_master_handle_t *masterHandle, status_t status, void *userData)
 {
+#ifdef DEBUG_OVER_SPI
     masterFinished = true;
+#endif
 }
 
 void DebugOverSpi_Init(void)
@@ -42,7 +44,6 @@ void DebugOverSpi_Init(void)
     SPI_MasterGetDefaultConfig(&userConfig);
     uint32_t srcFreq = CLOCK_GetFreq(EXAMPLE_SPI_MASTER_SOURCE_CLOCK);
     SPI_MasterInit(EXAMPLE_SPI_MASTER, &userConfig, srcFreq);
-
     SPI_MasterTransferCreateHandle(EXAMPLE_SPI_MASTER, &handle, masterCallback, NULL);
 #endif
 }
diff --git a/left/src/init_peripherals.c b/left/src/init_peripherals.c
index 302bb55..f03562f 100644
--- a/left/src/init_peripherals.c
+++ b/left/src/init_peripherals.c
@@ -18,12 +18,14 @@ uint8_t byteIn;
 uint8_t rxMessagePos;
 i2c_slave_transfer_event_t prevEvent;
 
-uint8_t dosBuffer[60];
+uint8_t dosBuffer[2];
 
 static void i2cSlaveCallback(I2C_Type *base, i2c_slave_transfer_t *xfer, void *userData)
 {
     dosBuffer[0] = xfer->event;
-    DebugOverSpi_Send(dosBuffer, 1);
+    dosBuffer[1] = byteIn;
+    DebugOverSpi_Send(dosBuffer, 2);
+
     switch (xfer->event) {
         case kI2C_SlaveTransmitEvent:
             SlaveTxHandler();