1 files changed, 173 insertions, 0 deletions

diff --git a/lib/chibios-contrib/os/hal/ports/MSP430X/hal_dma_lld.h b/lib/chibios-contrib/os/hal/ports/MSP430X/hal_dma_lld.h
new file mode 100644
index 000000000..dd707b324
--- /dev/null
+++ b/lib/chibios-contrib/os/hal/ports/MSP430X/hal_dma_lld.h
@@ -0,0 +1,173 @@
+/*
+    ChibiOS - Copyright (C) 2016 Andrew Wygle aka awygle
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    MSP430X/hal_dma_lld.c
+ * @brief   MSP430X DMA subsystem low level driver header.
+ * @note    This driver is used as a DMA engine for the other
+ *          low level drivers.
+ *
+ * @addtogroup MSP430X_DMA
+ * @{
+ */
+
+#ifndef HAL_MSP430X_DMA_H
+#define HAL_MSP430X_DMA_H
+
+#if (HAL_USE_DMA == TRUE) || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+#define MSP430X_DMA_SINGLE DMADT_0
+#define MSP430X_DMA_BLOCK DMADT_1
+#define MSP430X_DMA_BURST DMADT_2
+
+#define MSP430X_DMA_SRCINCR DMASRCINCR_3
+#define MSP430X_DMA_SRCDECR DMASRCINCR_2
+#define MSP430X_DMA_DSTINCR DMADSTINCR_3
+#define MSP430X_DMA_DSTDECR DMADSTINCR_2
+
+#define MSP430X_DMA_SRCBYTE DMASRCBYTE
+#define MSP430X_DMA_DSTBYTE DMADSTBYTE
+#define MSP430X_DMA_SRCWORD 0
+#define MSP430X_DMA_DSTWORD 0
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+#if !defined(DMA_BASE) && !defined(MSP430X_DMA_SOFTWARE)
+#error "The MSP430 device in use does not support DMA. Explicitly enable"
+#error "software emulation by defining MSP430X_DMA_SOFTWARE."
+#endif
+
+#if defined(__MSP430_HAS_DMAX_1__) || defined(__MSP430X_HAS_DMA_1__)
+#define MSP430X_DMA_CHANNELS 1
+#elif defined(__MSP430_HAS_DMAX_3__) || defined(__MSP430X_HAS_DMA_3__)
+#define MSP430X_DMA_CHANNELS 3
+#elif defined(__MSP430_HAS_DMAX_6__) || defined(__MSP430X_HAS_DMA_6__)
+#define MSP430X_DMA_CHANNELS 6
+#else
+#error "Unexpected error - how many DMA channels does your MSP have?"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief     Type of DMA callback function pointer.
+ */
+typedef void (*msp430x_dma_cbp_t)(void * args);
+
+/**
+ * @brief     DMA callback, function and argument.
+ */
+typedef struct {
+  msp430x_dma_cbp_t callback; /**< @brief Callback function pointer   */
+  void * args;                /**< @brief Callback function arguments */
+} msp430x_dma_cb_t;
+
+/**
+ * @brief     MSP430X DMA request structure.
+ */
+typedef struct {
+  const void * source_addr;  /**< @brief Source address                       */
+  void * dest_addr;          /**< @brief Destination address                  */
+  uint16_t size;             /**< @brief Number of values to transfer         */
+  uint16_t addr_mode;        /**< @brief Address manipulation mode            */
+  uint16_t data_mode;        /**< @brief Data sizes (b2b, w2w, b2w, w2b)      */
+  uint16_t transfer_mode;    /**< @brief Transfer mode (single, block, burst) */
+  uint16_t trigger;          /**< @brief Triggering event (see datasheet)     */
+  msp430x_dma_cb_t callback; /**< @brief Callback function and arguments      */
+} msp430x_dma_req_t;
+
+/**
+ * @brief     MSP430X DMA channel register structure.
+ */
+typedef struct {
+  volatile uint16_t ctl; /**< @brief Control register             */
+  volatile uint32_t sa;  /**< @brief Source address register      */
+  volatile uint32_t da;  /**< @brief Destination address register */
+  volatile uint16_t sz;  /**< @brief Size register                */
+  volatile uint16_t pad1;
+  volatile uint16_t pad2;
+} msp430x_dma_ch_reg_t;
+
+/**
+ * @brief     MSP430X DMA controller register structure.
+ */
+typedef struct {
+  volatile uint8_t tsel0; /**< @brief Trigger select for channel 0 */
+  volatile uint8_t tsel1; /**< @brief Trigger select for channel 1 */
+  volatile uint8_t tsel2; /**< @brief Trigger select for channel 2 */
+  volatile uint8_t tsel3; /**< @brief Trigger select for channel 3 */
+  volatile uint8_t tsel4; /**< @brief Trigger select for channel 4 */
+  volatile uint8_t tsel5; /**< @brief Trigger select for channel 5 */
+  volatile uint8_t tsel6; /**< @brief Trigger select for channel 6 */
+  volatile uint8_t tsel7; /**< @brief Trigger select for channel 7 */
+  volatile uint16_t ctl4; /**< @brief Controller register 4        */
+} msp430x_dma_ctl_reg_t;
+
+/**
+ * @brief     MSP430X DMA channel structure.
+ */
+typedef struct {
+  msp430x_dma_ch_reg_t * registers; /**< @brief Pointer to channel registers */
+  uint8_t index; /**< @brief Index of channel trigger control register    */
+  msp430x_dma_cb_t * cb; /**< @brief Pointer to callback function  and args  */
+} msp430x_dma_ch_t;
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/**
+ * @brief     Identifies a DMA trigger using a mnemonic.
+ *
+ * @param[in] mnem    The mnemonic for the trigger, e.g. UCA0RXIFG to trigger
+ *                    on UART receive.
+ */
+#define DMA_TRIGGER_MNEM(mnem) DMA0TSEL__##mnem
+
+/** @} */
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void dmaInit(void);
+int dmaRequestS(msp430x_dma_req_t * request, systime_t timeout);
+bool dmaAcquireI(msp430x_dma_ch_t * channel, uint8_t index);
+void dmaTransfer(msp430x_dma_ch_t * channel, msp430x_dma_req_t * request);
+void dmaRelease(msp430x_dma_ch_t * channel);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_DMA == true */
+
+#endif /* HAL_MSP430X_DMA_H */