From 002945cc6ce84eb691a5329db1cbd0f51a5e1f16 Mon Sep 17 00:00:00 2001
From: "Daniel P. Carvalho" <danieloak@gmail.com>
Date: Thu, 15 Jul 2021 11:55:11 -0300
Subject: [PATCH] Add DAC example to nucleo-g431kb

---
 boards/arm/stm32/nucleo-g431kb/src/Make.defs  |  4 +
 .../stm32/nucleo-g431kb/src/nucleo-g431kb.h   | 12 +++
 .../stm32/nucleo-g431kb/src/stm32_bringup.c   | 10 +++
 .../arm/stm32/nucleo-g431kb/src/stm32_dac.c   | 89 +++++++++++++++++++
 4 files changed, 115 insertions(+)
 create mode 100644 boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c

diff --git a/boards/arm/stm32/nucleo-g431kb/src/Make.defs b/boards/arm/stm32/nucleo-g431kb/src/Make.defs
index fce06a2232..f462d8923c 100755
--- a/boards/arm/stm32/nucleo-g431kb/src/Make.defs
+++ b/boards/arm/stm32/nucleo-g431kb/src/Make.defs
@@ -41,6 +41,10 @@ ifeq ($(CONFIG_STM32_COMP),y)
 CSRCS += stm32_comp.c
 endif
 
+ifeq ($(CONFIG_STM32_DAC),y)
+CSRCS += stm32_dac.c
+endif
+
 DEPPATH += --dep-path board
 VPATH += :board
 CFLAGS += $(shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board)
diff --git a/boards/arm/stm32/nucleo-g431kb/src/nucleo-g431kb.h b/boards/arm/stm32/nucleo-g431kb/src/nucleo-g431kb.h
index 609d10c5a6..c1da1a7e71 100755
--- a/boards/arm/stm32/nucleo-g431kb/src/nucleo-g431kb.h
+++ b/boards/arm/stm32/nucleo-g431kb/src/nucleo-g431kb.h
@@ -114,4 +114,16 @@ int stm32_pwm_setup(void);
 int stm32_comp_setup(void);
 #endif
 
+/****************************************************************************
+ * Name: stm32_comp_setup
+ *
+ * Description:
+ *  Initialize COMP peripheral for the board.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DAC
+int stm32_dac_setup(void);
+#endif
+
 #endif /* __BOARDS_ARM_STM32_NUCLEO_G431KB_SRC_NUCLEO_G431KB_H */
diff --git a/boards/arm/stm32/nucleo-g431kb/src/stm32_bringup.c b/boards/arm/stm32/nucleo-g431kb/src/stm32_bringup.c
index fa504d7c27..80257f475a 100755
--- a/boards/arm/stm32/nucleo-g431kb/src/stm32_bringup.c
+++ b/boards/arm/stm32/nucleo-g431kb/src/stm32_bringup.c
@@ -98,6 +98,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_DAC
+  /* Initialize and register the DAC driver. */
+
+  ret = stm32_dac_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_dac_setup failed: %d\n", ret);
+    }
+#endif
+
   UNUSED(ret);
   return OK;
 }
diff --git a/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c b/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c
new file mode 100644
index 0000000000..e5bed08fe2
--- /dev/null
+++ b/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c
@@ -0,0 +1,89 @@
+/****************************************************************************
+ * boards/arm/stm32/nucleo-g431kb/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-g431kb.h"
+
+#ifdef CONFIG_DAC
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#ifdef CONFIG_STM32_DAC1CH1
+static struct dac_dev_s *g_dac1;
+#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
+
+  UNUSED(ret);
+  return OK;
+}
+
+#endif  /* CONFIG_DAC */