Diff: src/mbed/admw_spi.cpp

Revision:

5:0728bde67bdb

Parent:

0:85855ecd3257

Child:

13:97cb32670539

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mbed/admw_spi.cpp	Wed Jun 05 05:39:15 2019 +0000
@@ -0,0 +1,155 @@
+/******************************************************************************
+Copyright 2017 (c) Analog Devices, Inc.
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+  - Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  - Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+  - Neither the name of Analog Devices, Inc. nor the names of its
+    contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+  - The use of this software may or may not infringe the patent rights
+    of one or more patent holders. This license does not release you
+    from the requirement that you obtain separate licenses from these
+    patent holders to use this software.
+  - Use of the software either in source or binary form, must be run
+    on or directly connected to an Analog Devices Inc. component.
+
+THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+/*!
+ ******************************************************************************
+ * @file:
+ * @brief:  ADMW OS-dependent wrapper layer for SPI interface
+ *-----------------------------------------------------------------------------
+ */
+
+#include <mbed.h>
+
+#include "inc/admw_spi.h"
+#include "inc/admw_log.h"
+
+#define ADMW_SPI_MODE       0 /* CPOL=0, CPHA=0 */
+#define ADMW_SPI_FRAME_SIZE 8 /* 8-bit frame size */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// Struct to contain anything needed to identify the SPI device
+// This is returned as a ADMW_SPI_HANDLE*, and is required to use
+// the other SPI functions
+typedef struct {
+    SPI *_spi;
+    DigitalOut *_cs;
+    DigitalOut *_wakeup;
+} SpiContext_t;
+
+
+/*
+ * Open the SPI interface and allocate resources
+ */
+ADMW_RESULT admw_SpiOpen(
+    ADMW_PLATFORM_SPI_CONFIG *pConfig,
+    ADMW_SPI_HANDLE *phDevice)
+{
+    SpiContext_t *pCtx = (SpiContext_t*)malloc(sizeof(*pCtx));
+    if(!pCtx) {
+        ADMW_LOG_ERROR("Failed to allocate memory for SPI device");
+        return ADMW_NO_MEM;
+    }
+    
+    pCtx->_spi = new SPI((PinName)pConfig->mosiPin,
+                (PinName)pConfig->misoPin,
+                (PinName)pConfig->sckPin);
+    pCtx->_cs = new DigitalOut((PinName)pConfig->csPin, 1);
+    
+    pCtx->_spi->format(ADMW_SPI_FRAME_SIZE, ADMW_SPI_MODE);
+    pCtx->_spi->frequency(pConfig->maxSpeedHz);
+    
+    pCtx->_wakeup = new DigitalOut((PinName)pConfig->wakeupPin, 1);
+    
+    *phDevice = (ADMW_SPI_HANDLE)pCtx;
+    
+    return ADMW_SUCCESS;
+}
+
+/*
+ * Execute a bi-directional data transfer on the SPI interface
+ */
+ADMW_RESULT
+admw_SpiTransfer(
+    ADMW_SPI_HANDLE hDevice,
+    void *pTxData,
+    void *pRxData,
+    unsigned nLength,
+    bool bCsHold)
+{
+    int rc = 0;
+    
+    SpiContext_t *pCtx = (SpiContext_t*)hDevice;
+    
+    *(pCtx->_wakeup) = 0;
+
+    wait_us(60);
+
+    *(pCtx->_cs) = 0;
+
+    rc  = pCtx->_spi->write((char*)(pTxData), pTxData ? nLength : 0,
+                     (char*)(pRxData), pRxData ? nLength : 0);
+    
+    if ((rc < 0) || !bCsHold)
+        *(pCtx->_cs) = 1;
+
+    *(pCtx->_wakeup) = 1;
+
+    if (rc < 0)
+    {
+        ADMW_LOG_ERROR("Failed to complete SPI transfer");
+        return ADMW_FAILURE;
+    }
+
+    return ADMW_SUCCESS;
+}
+
+/*
+ * Close the SPI interface and free resources
+ */
+void admw_SpiClose(
+    ADMW_SPI_HANDLE hDevice)
+{
+    SpiContext_t *pCtx = (SpiContext_t *)hDevice;
+
+    delete pCtx->_spi;
+    delete pCtx->_cs;
+    delete pCtx->_wakeup;
+    
+    free(pCtx);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+/*!
+ * @}
+ */