From 7c7112a157d863665fe1b8fae2a94fbbb17dc199 Mon Sep 17 00:00:00 2001
From: px4dev <px4@purgatory.org>
Date: Tue, 8 Jan 2013 01:11:35 -0800
Subject: [PATCH] Implement stm32_dmaresidual for the F1 DMA driver.

---
 nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c b/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c
index 89b279beaa..66a806d0c4 100644
--- a/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c
+++ b/nuttx/arch/arm/src/stm32/stm32f10xxx_dma.c
@@ -558,6 +558,24 @@ void stm32_dmastop(DMA_HANDLE handle)
   stm32_dmachandisable(dmach);
 }
 
+/****************************************************************************
+ * Name: stm32_dmaresidual
+ *
+ * Description:
+ *   Returns the number of bytes remaining to be transferred
+ *
+ * Assumptions:
+ *   - DMA handle allocated by stm32_dmachannel()
+ *
+ ****************************************************************************/
+
+size_t stm32_dmaresidual(DMA_HANDLE handle)
+{
+  struct stm32_dma_s *dmach = (struct stm32_dma_s *)handle;
+
+  return dmachan_getreg(dmach, STM32_DMACHAN_CNDTR_OFFSET);
+}
+
 /****************************************************************************
  * Name: stm32_dmasample
  *