1 files changed, 98 insertions, 0 deletions
diff --git a/os/hal/platforms/STM32/stm32_dma.c b/os/hal/platforms/STM32/stm32_dma.c
new file mode 100644
index 000000000..da036d159
--- /dev/null
+++ b/os/hal/platforms/STM32/stm32_dma.c
@@ -0,0 +1,98 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file stm32_dma.c
+ * @brief STM32 DMA helper driver code
+ * @addtogroup STM32_DMA
+ * @{
+ */
+
+#include "ch.h"
+#include "stm32_dma.h"
+
+#undef FALSE
+#undef TRUE
+#include <stm32f10x.h>
+#define FALSE 0
+#define TRUE (!FALSE)
+
+static cnt_t dmacnt1;
+#if defined(STM32F10X_HD) || defined (STM32F10X_CL)
+static cnt_t dmacnt2;
+#endif
+
+/**
+ * @brief STM32 DMA helper initialization.
+ */
+void dmaInit(void) {
+
+  dmacnt1 = 0;
+#if defined(STM32F10X_HD) || defined (STM32F10X_CL)
+  dmacnt2 = 0;
+#endif
+}
+
+/**
+ * @brief Enables the specified DMA controller clock.
+ *
+ * @param[in] dma the DMA controller id
+ */
+void dmaEnable(uint32_t dma) {
+
+  switch (dma) {
+  case DMA1_ID:
+    if (dmacnt1++ == 0) {
+      RCC->AHBENR |= RCC_AHBENR_DMA1EN;
+      DMA1->IFCR = 0x0FFFFFFF;
+    }
+    break;
+#if defined(STM32F10X_HD) || defined (STM32F10X_CL)
+  case DMA2_ID:
+    if (dmacnt2++ == 0) {
+      RCC->AHBENR |= RCC_AHBENR_DMA2EN;
+      DMA2->IFCR = 0x0FFFFFFF;
+    }
+    break;
+#endif
+  }
+}
+
+/**
+ * @brief Disables the specified DMA controller clock.
+ *
+ * @param[in] dma the DMA controller id
+ */
+void dmaDisable(uint32_t dma) {
+
+  switch (dma) {
+  case DMA1_ID:
+    if (--dmacnt1 == 0)
+      RCC->AHBENR &= ~RCC_AHBENR_DMA1EN;
+    break;
+#if defined(STM32F10X_HD) || defined (STM32F10X_CL)
+  case DMA2_ID:
+    if (--dmacnt2 == 0)
+      RCC->AHBENR &= ~RCC_AHBENR_DMA2EN;
+    break;
+#endif
+  }
+}
+
+/** @} */