2 files changed, 18 insertions, 7 deletions
diff --git a/os/hal/platforms/STM32/DMAv2/stm32_dma.c b/os/hal/platforms/STM32/DMAv2/stm32_dma.c
index 48c0d4e95..5d320dab3 100644
--- a/os/hal/platforms/STM32/DMAv2/stm32_dma.c
+++ b/os/hal/platforms/STM32/DMAv2/stm32_dma.c
@@ -415,7 +415,7 @@ void dmaInit(void) {
   int i;
 
   dma_streams_mask = 0;
-  for (i = 0; i < STM32_DMA_STREAMS; i--) {
+  for (i = 0; i < STM32_DMA_STREAMS; i++) {
     _stm32_dma_streams[i].stream->CR = 0;
     dma_isr_redir[i].dma_func = NULL;
   }
@@ -446,7 +446,7 @@ void dmaInit(void) {
  *
  * @special
  */
-bool_t dmaAllocate(stm32_dma_stream_t *dmastp,
+bool_t dmaAllocate(const stm32_dma_stream_t *dmastp,
                    stm32_dmaisr_t func, void *param) {
 
   chDbgCheck(dmastp != NULL, "dmaAllocate");
@@ -488,7 +488,7 @@ bool_t dmaAllocate(stm32_dma_stream_t *dmastp,
  *
  * @special
  */
-void dmaRelease(stm32_dma_stream_t *dmastp) {
+void dmaRelease(const stm32_dma_stream_t *dmastp) {
 
   chDbgCheck(dmastp != NULL, "dmaRelease");
 
diff --git a/os/hal/platforms/STM32/DMAv2/stm32_dma.h b/os/hal/platforms/STM32/DMAv2/stm32_dma.h
index 5d87e67a9..88f594eec 100644
--- a/os/hal/platforms/STM32/DMAv2/stm32_dma.h
+++ b/os/hal/platforms/STM32/DMAv2/stm32_dma.h
@@ -217,11 +217,11 @@ typedef void (*stm32_dmaisr_t)(void *p, uint32_t flags);
 }
 
 /**
- * @brief   Associates an alternate memory destination to a DMA stream.
+ * @brief   Sets the number of transfers to be performed.
  * @note    This function can be invoked in both ISR or thread context.
  *
  * @param[in] dmastp    pointer to a stm32_dma_stream_t structure
- * @param[in] size      value to be written in the NDTR register
+ * @param[in] size      value to be written in the CNDTR register
  *
  * @special
  */
@@ -230,6 +230,17 @@ typedef void (*stm32_dmaisr_t)(void *p, uint32_t flags);
 }
 
 /**
+ * @brief   Returns the number of transfers to be performed.
+ * @note    This function can be invoked in both ISR or thread context.
+ *
+ * @param[in] dmastp    pointer to a stm32_dma_stream_t structure
+ * @return              The number of transfers to be performed.
+ *
+ * @special
+ */
+#define dmaStreamGetTransactionSize(dmastp) ((size_t)((dmastp)->stream->NDTR))
+
+/**
  * @brief   Programs the stream mode settings.
  * @note    This function can be invoked in both ISR or thread context.
  *
@@ -303,9 +314,9 @@ extern const stm32_dma_stream_t _stm32_dma_streams[STM32_DMA_STREAMS];
 extern "C" {
 #endif
   void dmaInit(void);
-  bool_t dmaAllocate(stm32_dma_stream_t *dmastp,
+  bool_t dmaAllocate(const stm32_dma_stream_t *dmastp,
                      stm32_dmaisr_t func, void *param);
-  void dmaRelease(stm32_dma_stream_t *dmastp);
+  void dmaRelease(const stm32_dma_stream_t *dmastp);
 #ifdef __cplusplus
 }
 #endif