diff --git a/os/hal/ports/SAMA/LLD/DMAv1/sama_xdmac.h b/os/hal/ports/SAMA/LLD/DMAv1/sama_xdmac.h
index 84f75f855..1f0921903 100644
--- a/os/hal/ports/SAMA/LLD/DMAv1/sama_xdmac.h
+++ b/os/hal/ports/SAMA/LLD/DMAv1/sama_xdmac.h
@@ -143,6 +143,20 @@ typedef struct {
 #define dmaGetChannelInt(dmachp)                                      \
   (dmachp)->xdmac->XDMAC_CHID[(dmachp)->chid].XDMAC_CIS
 
+/**
+ * @brief   Returns the number of transfers to be performed.
+ * @note    This function can be invoked in both ISR or thread context.
+ * @pre     The stream must have been allocated using @p dmaChannelAllocate().
+ * @post    After use the stream can be released using @p dmaChannelRelease().
+ *
+ * @param[in] dmachp       pointer to a @p sama_dma_channel_t structure
+ * @return              The number of transfers to be performed.
+ *
+ * @special
+ */
+#define dmaChannelGetTransactionSize(dmachp)                          \
+  ((size_t)((dmachp)->xdmac->XDMAC_CHID[(dmachp)->chid].XDMAC_CUBC))
+
 /**
  * @brief   Associates a source to a DMA channel.
  * @note    This function can be invoked in both ISR or thread context.