From 91264ba704f5141bdb6788cf249ed3ab30cd7e32 Mon Sep 17 00:00:00 2001
From: "Daniel P. Carvalho" <danieloak@gmail.com>
Date: Thu, 29 Jul 2021 17:55:46 -0300
Subject: [PATCH] nucleo-g431kb: modify COMP example COMP example was changed
 to use DAC3CH2 signal on COMP INM input.

---
 .../nucleo-g431kb/configs/comp/defconfig      |  7 ++++++
 .../arm/stm32/nucleo-g431kb/src/stm32_dac.c   | 23 +++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/boards/arm/stm32/nucleo-g431kb/configs/comp/defconfig b/boards/arm/stm32/nucleo-g431kb/configs/comp/defconfig
index 5ac495da0f..154423ef95 100644
--- a/boards/arm/stm32/nucleo-g431kb/configs/comp/defconfig
+++ b/boards/arm/stm32/nucleo-g431kb/configs/comp/defconfig
@@ -16,7 +16,10 @@ CONFIG_ARCH_STACKDUMP=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_BUILTIN=y
 CONFIG_COMP=y
+CONFIG_DAC=y
 CONFIG_DEFAULT_SMALL=y
+CONFIG_EXAMPLES_DAC=y
+CONFIG_EXAMPLES_DAC_DEVPATH="/dev/dac5"
 CONFIG_INTELHEX_BINARY=y
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_BUILTIN_APPS=y
@@ -32,7 +35,11 @@ CONFIG_START_MONTH=6
 CONFIG_START_YEAR=2021
 CONFIG_STM32_COMP2=y
 CONFIG_STM32_COMP2_HYST=3
+CONFIG_STM32_COMP2_INM=4
 CONFIG_STM32_COMP2_OUT=y
+CONFIG_STM32_DAC3=y
+CONFIG_STM32_DAC3CH2=y
+CONFIG_STM32_DAC3CH2_MODE=3
 CONFIG_STM32_DISABLE_IDLE_SLEEP_DURING_DEBUG=y
 CONFIG_STM32_FORCEPOWER=y
 CONFIG_STM32_JTAG_FULL_ENABLE=y
diff --git a/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c b/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c
index e5bed08fe2..1040a8b7d3 100644
--- a/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c
+++ b/boards/arm/stm32/nucleo-g431kb/src/stm32_dac.c
@@ -42,6 +42,10 @@
 static struct dac_dev_s *g_dac1;
 #endif
 
+#ifdef CONFIG_STM32_DAC3CH2
+static struct dac_dev_s *g_dac5;
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -80,6 +84,25 @@ int stm32_dac_setup(void)
       return ret;
     }
 
+#endif
+
+#ifdef CONFIG_STM32_DAC3CH2
+  g_dac5 = stm32_dacinitialize(5);
+  if (g_dac5 == NULL)
+    {
+      aerr("ERROR: Failed to get DAC interface\n");
+      return -ENODEV;
+    }
+
+  /* Register the DAC driver at "/dev/dac5" */
+
+  ret = dac_register("/dev/dac5", g_dac5);
+  if (ret < 0)
+    {
+      aerr("ERROR: dac_register() failed: %d\n", ret);
+      return ret;
+    }
+
 #endif
 
   UNUSED(ret);