diff --git a/ili9341.c b/ili9341.c
index f423b19..61cb305 100644
--- a/ili9341.c
+++ b/ili9341.c
@@ -452,6 +452,7 @@ void ili9341_read_memory(int x, int y, int w, int h, int len, uint16_t *out)
   // Skip SPI rx buffer
   while (SPI_RX_IS_NOT_EMPTY) (void)SPI_READ_DATA;
   // Init Rx DMA buffer, size, mode (spi and mem data size is 8 bit)
+  chSysLock();
   dmaStreamSetMemory0(dmarx, rgbbuf);
   dmaStreamSetTransactionSize(dmarx, data_size);
   dmaStreamSetMode(dmarx, rxdmamode | STM32_DMA_CR_PSIZE_BYTE | STM32_DMA_CR_MSIZE_BYTE |
@@ -467,6 +468,7 @@ void ili9341_read_memory(int x, int y, int w, int h, int len, uint16_t *out)
   // Wait DMA completion
   dmaWaitCompletion(dmatx);
   dmaWaitCompletion(dmarx);
+  chSysUnlock();
   CS_HIGH;
 
   // Parce recived data