1 files changed, 46 insertions, 0 deletions
diff --git a/lib/stm32/common/dma_common_csel.c b/lib/stm32/common/dma_common_csel.c
new file mode 100644
index 00000000..4cf1fca9
--- /dev/null
+++ b/lib/stm32/common/dma_common_csel.c
@@ -0,0 +1,46 @@
+/** @addtogroup dma_file DMA peripheral API
+@ingroup peripheral_apis
+
+LGPL License Terms @ref lgpl_license
+ */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2019 Guillaume Revaillot <g.revaillot@gmail.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**@{*/
+
+#include <libopencm3/stm32/dma.h>
+
+/*---------------------------------------------------------------------------*/
+/** @brief DMA Channel Set Request Selection
+
+Set DMA request mapping selection for given channel. Refer to datasheet for channel
+request mapping tables.
+
+@param[in] dma DMA controller base address: DMA1 or DMA2
+@param[in] channel Channel number:  1-7 for DMA1 or 1-5 for DMA2
+@param[in] request DMA request mapping.
+*/
+
+void dma_set_channel_request(uint32_t dma, uint8_t channel, uint8_t request)
+{
+	uint32_t reg32 = DMA_CSELR(dma) & ~(DMA_CSELR_CxS_MASK << DMA_CSELR_CxS_SHIFT(channel));
+	DMA_CSELR(dma) = reg32 | ((DMA_CSELR_CxS_MASK & request) << DMA_CSELR_CxS_SHIFT(channel));
+}
+
+/**@}*/