boards/arm/stm32/nucleo-f446re: added support for DAC driver

Signed-off-by: Michal Lenc <michallenc@seznam.cz>

boards/arm/stm32/nucleo-f446re/README.txt

@@ -559,6 +559,14 @@ Configurations
     Functionality of CAN driver can be tested by calling application
     "can" in NuttShell. This application sends 100 messages over CAN 1.
 
+  dac:
+  ----
+    This is an nsh configuration (see above) with added support
+    for digital analog converter driver.
+
+    Functionality of DAC driver can be tested by calling application
+    "dac" in NuttShell. GPIO_DAC1_OUT1 pin is set on PA_4.
+
   gpio:
   -----
     This is an nsh configuration (see above) with added support for GPIO

boards/arm/stm32/nucleo-f446re/configs/dac/defconfig

@@ -0,0 +1,60 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_FPU is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_CMDPARMS is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_PS is not set
+# CONFIG_STM32_FLASH_PREFETCH is not set
+CONFIG_ANALOG=y
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="nucleo-f446re"
+CONFIG_ARCH_BOARD_NUCLEO_F446RE=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F446R=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LATE_INITIALIZE=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_DAC=y
+CONFIG_EXAMPLES_DAC=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_MAX_TASKS=16
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=131072
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SPI=y
+CONFIG_START_DAY=14
+CONFIG_START_MONTH=10
+CONFIG_START_YEAR=2014
+CONFIG_STM32_CRC=y
+CONFIG_STM32_DAC1=y
+CONFIG_STM32_DAC1CH1=y
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_OTGFS=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_USART2=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_TESTING_OSTEST=y
+CONFIG_USART2_SERIAL_CONSOLE=y
+CONFIG_USER_ENTRYPOINT="nsh_main"

boards/arm/stm32/nucleo-f446re/src/Make.defs

@@ -57,6 +57,10 @@ ifeq ($(CONFIG_DEV_GPIO),y)
 CSRCS += stm32_gpio.c
 endif
 
+ifeq ($(CONFIG_DAC),y)
+CSRCS += stm32_dac.c
+endif
+
 ifeq ($(CONFIG_LIB_BOARDCTL),y)
 CSRCS += stm32_appinit.c
 endif

boards/arm/stm32/nucleo-f446re/src/nucleo-f446re.h

@@ -373,4 +373,22 @@ int stm32_pwm_setup(void);
 int stm32_gpio_initialize(void);
 #endif
 
+/****************************************************************************
+ * Name: stm32_dac_setup
+ *
+ * Description:
+ *   Initialize and register the DAC0 of the microcontroller.
+ *
+ * Input parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/dac0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_DAC)
+int stm32_dac_setup(void);
+#endif
+
 #endif /* __BOARDS_ARM_STM32_NUCLEO_F401RE_SRC_NUCLEO_F446RE_H */

boards/arm/stm32/nucleo-f446re/src/stm32_bringup.c

@@ -202,5 +202,15 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_DAC
+  /* Initialize DAC and register the DAC driver. */
+
+  ret = stm32_dac_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to start ADC1: %d\n", ret);
+    }
+#endif
+
   return ret;
 }

boards/arm/stm32/nucleo-f446re/src/stm32_dac.c

@@ -0,0 +1,110 @@
+/****************************************************************************
+ * boards/arm/stm32/nucleo-f446re/src/stm32_dac.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/analog/dac.h>
+#include <arch/board/board.h>
+
+#include "stm32_dac.h"
+#include "nucleo-f446re.h"
+
+#ifdef CONFIG_DAC
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#ifdef CONFIG_STM32_DAC1CH1
+static struct dac_dev_s *g_dac1;
+#endif
+
+#ifdef CONFIG_STM32_DAC1CH2
+static struct dac_dev_s *g_dac2;
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_dac_setup
+ *
+ * Description:
+ *   Initialize and register the DAC driver.
+ *
+ * Input parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/dac0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int stm32_dac_setup(void)
+{
+  int ret;
+#ifdef CONFIG_STM32_DAC1CH1
+  g_dac1 = stm32_dacinitialize(1);
+  if (g_dac1 == NULL)
+    {
+      aerr("ERROR: Failed to get DAC interface\n");
+      return -ENODEV;
+    }
+
+  /* Register the DAC driver at "/dev/dac0" */
+
+  ret = dac_register("/dev/dac0", g_dac1);
+  if (ret < 0)
+    {
+      aerr("ERROR: dac_register() failed: %d\n", ret);
+      return ret;
+    }
+
+#endif
+#ifdef CONFIG_STM32_DAC1CH2
+  g_dac2 = stm32_dacinitialize(2);
+  if (g_dac2 == NULL)
+    {
+      aerr("ERROR: Failed to get DAC interface\n");
+      return -ENODEV;
+    }
+
+  /* Register the DAC driver at "/dev/dac1" */
+
+  ret = dac_register("/dev/dac1", g_dac2);
+  if (ret < 0)
+    {
+      aerr("ERROR: dac_register() failed: %d\n", ret);
+      return ret;
+    }
+#endif
+
+  UNUSED(ret);
+  return OK;
+}
+
+#endif  /* CONFIG_DAC */