diff --git a/include/fw_spi.h b/include/fw_spi.h
index f860a5b..4767f3e 100644
--- a/include/fw_spi.h
+++ b/include/fw_spi.h
@@ -92,5 +92,6 @@ typedef enum
 #define SPI_SetPort(__ALTER_PORT__)    (P_SW1 = P_SW1 & ~(0x03 << 2) | ((__ALTER_PORT__) << 2))
 
 uint8_t SPI_TxRx(uint8_t dat);
+void SPI_TxRxBytes(uint8_t *pBuf, uint8_t len);
 
 #endif
diff --git a/src/fw_spi.c b/src/fw_spi.c
index 71b9584..ec4a6e4 100644
--- a/src/fw_spi.c
+++ b/src/fw_spi.c
@@ -24,3 +24,11 @@ uint8_t SPI_TxRx(uint8_t dat)
     SPI_ClearInterrupts();
 	return SPDAT;
 }
+
+void SPI_TxRxBytes(uint8_t *pBuf, uint8_t len)
+{
+    while(len--)
+    {
+        *pBuf++ = SPI_TxRx(*pBuf);
+    }
+}
\ No newline at end of file