drivers: mspi: prepare APP side driver for receiving data

Fixed hard fault that occurs when receiving data caused by
memory access violation and changed logging so that all
received data is printed, not only an opcode.

Signed-off-by: Magdalena Pastula <[email protected]>

Author: magp-nordic

drivers/mspi/mspi_nrfe.c

@@ -157,7 +157,7 @@ static void ep_recv(const void *data, size_t len, void *priv)
 	}
 	}
 
-	LOG_DBG("Received msg with opcode: %d", response->opcode);
+	LOG_HEXDUMP_DBG((uint8_t *)data, len, "Received msg:");
 }
 
 /**
@@ -473,8 +473,15 @@ static int xfer_packet(struct mspi_xfer_packet *packet, uint32_t timeout)
 
 	/* Wait for the transfer to complete and receive data. */
 	if ((packet->dir == MSPI_RX) && (ipc_receive_buffer != NULL) && (ipc_received > 0)) {
-		memcpy((void *)packet->data_buf, (void *)ipc_receive_buffer, ipc_received);
-		packet->num_bytes = ipc_received;
+		/*
+		 * It is not possible to check whether received data is valid, so packet->num_bytes
+		 * should always be equal to ipc_received. If it is not, then something went wrong.
+		 */
+		if (packet->num_bytes != ipc_received) {
+			rc = -EIO;
+		} else {
+			memcpy((void *)packet->data_buf, (void *)ipc_receive_buffer, ipc_received);
+		}
 
 		/* Clear the receive buffer pointer and size */
 		ipc_receive_buffer = NULL;