STM32F746-Disco: Add ADC3 support.

configs/stm32f746g-disco/src/Makefile

@@ -52,6 +52,10 @@ ifeq ($(CONFIG_LIB_BOARDCTL),y)
 CSRCS += stm32_appinitialize.c
 endif
 
+ifeq ($(CONFIG_ADC),y)
+CSRCS += stm32_adc.c
+endif
+
 ifeq ($(CONFIG_ARCH_FPU),y)
 CSRCS += stm32_ostest.c
 endif

configs/stm32f746g-disco/src/stm32_adc.c

@@ -0,0 +1,165 @@
+/****************************************************************************
+ * configs/stm32f334-disco/src/stm32_adc.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Ivan Ucherdzhiev <ivanucherdjiev@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/board.h>
+#include <nuttx/analog/adc.h>
+
+#include "stm32_gpio.h"
+#include "stm32_adc.h"
+
+#ifndef CONFIG_STM32F7_ADC3
+#  error "Only ADC3 channels are availiable on the arduino header of the board"
+#endif
+
+#if defined(CONFIG_ADC) && defined(CONFIG_STM32F7_ADC3)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+/* If DMA support is not enabled, then only a single channel
+ * can be sampled.  Otherwise, data overruns would occur.
+ */
+
+#ifdef ADC_HAVE_DMA
+# define ADC3_NCHANNELS 6
+#else
+# define ADC3_NCHANNELS 1
+#endif
+
+/* The number of ADC channels in the conversion list */
+/* TODO DMA */
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* Identifying number of each ADC channel (even if NCHANNELS is less ) */
+
+static const uint8_t g_chanlist[6] =
+{
+  0,
+  4,
+  5,
+  6,
+  7,
+  8
+};
+
+/* Configurations of pins used by each ADC channel */
+
+static const uint32_t g_pinlist[6]  =
+{
+  GPIO_ADC3_IN0,                /* PA0/A0 */
+  GPIO_ADC3_IN4,                /* PF/A1 */
+  GPIO_ADC3_IN5,                /* PF7/A3 */
+  GPIO_ADC3_IN6,                /* PF8/A0 */
+  GPIO_ADC3_IN7,                /* PF9/A1 */
+  GPIO_ADC3_IN8                 /* PF10/A3 */
+};
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_adc_setup
+ *
+ * Description:
+ *   Initialize ADC and register the ADC driver.
+ *
+ ****************************************************************************/
+
+ int stm32_adc_setup(void)
+ {
+ #ifdef CONFIG_STM32F7_ADC3
+   static bool initialized = false;
+   struct adc_dev_s *adc;
+   int ret;
+   int i;
+
+   /* Check if we have already initialized */
+
+   if (!initialized)
+     {
+       /* Configure the pins as analog inputs for the selected channels */
+
+       for (i = 0; i < ADC3_NCHANNELS; i++)
+         {
+           stm32_configgpio(g_pinlist[i]);
+         }
+
+       /* Call stm32_adcinitialize() to get an instance of the ADC interface */
+
+       adc = stm32_adc_initialize(3, g_chanlist, ADC3_NCHANNELS);
+       if (adc == NULL)
+         {
+           aerr("ERROR: Failed to get ADC interface\n");
+           return -ENODEV;
+         }
+
+       /* Register the ADC driver at "/dev/adc0" */
+
+       ret = adc_register("/dev/adc3", adc);
+       if (ret < 0)
+         {
+           aerr("ERROR: adc_register failed: %d\n", ret);
+           return ret;
+         }
+
+       /* Now we are initialized */
+
+       initialized = true;
+     }
+
+   return OK;
+ #else
+   return -ENOSYS;
+ #endif
+ }
+
+#endif /* (CONFIG_ADC) && (CONFIG_STM32F7_ADC3) */

configs/stm32f746g-disco/src/stm32f746g-disco.h

@@ -1,7 +1,7 @@
 /****************************************************************************************************
  * configs/stm32f746g-disco/src/stm32f746g-disco.h
  *
- *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
  *   Authors: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -120,6 +120,18 @@
 
 int stm32_bringup(void);
 
+/****************************************************************************************************
+ * Name: stm32_adc_setup
+ *
+ * Description:
+ *   Initialize ADC and register the ADC driver.
+ *
+ ****************************************************************************************************/
+
+#ifdef CONFIG_ADC
+int stm32_adc_setup(void);
+#endif
+
 /****************************************************************************************************
  * Name: stm32_spidev_initialize
  *
@@ -143,5 +155,5 @@ void arch_sporadic_initialize(void);
 #endif
 
 #endif /* __ASSEMBLY__ */
-#endif /* __CONFIGS_STM32F746G_DISCO_SRC_STM32F746G_DISCO_H */
 
+#endif /* __CONFIGS_STM32F746G_DISCO_SRC_STM32F746G_DISCO_H */