Added a module for the opamp3

zephyr/dts/bindings/opamp3-gpio.yaml

+description: GPIO parent node
+
+compatible: "opamp3-gpio"
+
+child-binding:
+    description: OPAMP3 GPIO child node
+    properties:
+       gpios:
+          type: phandle-array
+          required: true
+       label:
+          required: true
+          type: string
+          description: Human readable string describing the device (used as device_get_binding() argument)

zephyr/dts/opamp3.dtsi

+/ {
+	opamp3-gpio {
+		compatible = "opamp3-gpio";
+		opamp3: op_amp3 {
+			gpios = <&gpiob 1 GPIO_ACTIVE_LOW >;
+			label = "OPAMP3";
+		};
+	};
+	
+	aliases {
+		opamp3 = &opamp3;
+	};
+};
\ No newline at end of file

zephyr/modules/owntech_opamp3_driver/zephyr/CMakeLists.txt

+if(CONFIG_OWNTECH_OPAMP3_DRIVER)
+  # Select directory to add to the include path
+  zephyr_include_directories(./public_include)
+  # Define the current folder as a Zephyr library
+  zephyr_library()
+  # Select source files to be compiled
+  zephyr_library_sources(
+    src/owntech_opamp3_driver.c
+    )
+endif()

zephyr/modules/owntech_opamp3_driver/zephyr/Kconfig

+config OWNTECH_OPAMP3_DRIVER
+	bool "Enable OwnTech opamp3 driver"
+	default y

zephyr/modules/owntech_opamp3_driver/zephyr/module.yml

+name: owntech_opamp3_driver
+build:
+  cmake: zephyr
+  kconfig: zephyr/Kconfig

zephyr/modules/owntech_opamp3_driver/zephyr/public_include/opamp3.h

+/*
+ * Copyright (c) 2020-2021 LAAS-CNRS
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as published by
+ *   the Free Software Foundation, either version 2.1 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGLPV2.1
+ */
+
+/**
+ * @brief   Zephyr's defines for an opamp (PB1)
+ * @date    2021
+ * @author  Luiz Villa <luiz.villa@laas.fr>
+ */
+
+
+#ifndef OPAMP3_H_
+#define OPAMP3_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define OPAMP3_LABEL "OPAMP3"
+
+
+void opamp3_set(const struct device* dev, int value);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NGND_H_

zephyr/modules/owntech_opamp3_driver/zephyr/src/owntech_opamp3_driver.c

+/*
+ * Copyright (c) 2020-2021 LAAS-CNRS
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as published by
+ *   the Free Software Foundation, either version 2.1 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGLPV2.1
+ */
+
+/**
+ * @brief   Owntech board neutral to ground gpio pin implementation
+ *
+ * @author  Clément Foucher <clement.foucher@laas.fr>
+ */
+
+
+// Zephyr
+#include <drivers/gpio.h>
+
+// Current file header
+#include "owntech_opamp3_driver.h"
+
+/////
+// Private functions
+
+static struct owntech_opamp3_driver_dev_data
+{
+	const struct device* gpio_dev;
+} data;
+
+static int opamp3_init(const struct device* dev)
+{
+    struct owntech_opamp3_driver_dev_data* data = dev->data;
+
+	data->gpio_dev = device_get_binding(OPAMP3_GPIO_LABEL);
+
+    gpio_pin_configure(data->gpio_dev, OPAMP3_GPIO_PIN, GPIO_PUSH_PULL | OPAMP3_GPIO_FLAGS);
+
+    OPAMP_InitStruct.PowerMode = LL_OPAMP_POWERMODE_NORMAL;
+    OPAMP_InitStruct.FunctionalMode = LL_OPAMP_MODE_FOLLOWER;
+    OPAMP_InitStruct.InputNonInverting = LL_OPAMP_INPUT_NONINVERT_DAC;
+ 
+    //LL_OPAMP_StructInit(&OPAMP_InitStruct);
+    LL_OPAMP_SetInputsMuxMode(OPAMP3, LL_OPAMP_INPUT_MUX_DISABLE);
+    LL_OPAMP_SetInternalOutput(OPAMP3, LL_OPAMP_INTERNAL_OUPUT_DISABLED);
+    LL_OPAMP_SetTrimmingMode(OPAMP3, LL_OPAMP_TRIMMING_FACTORY);
+    //LL_OPAMP_Init(OPAMP3, &OPAMP_InitStruct);// need to set the LL correctly
+ 	return 0;
+}
+
+
+
+//////
+// Device definition
+
+DEVICE_DEFINE(owntech_opamp3_driver,
+              OPAMP3_LABEL,
+              opamp3_init,
+              device_pm_control_nop,
+              &data,
+              NULL,
+              PRE_KERNEL_2,
+              CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
+              NULL
+             );

zephyr/modules/owntech_opamp3_driver/zephyr/src/owntech_opamp3_driver.h

+/*
+ * Copyright (c) 2021 LAAS-CNRS
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as published by
+ *   the Free Software Foundation, either version 2.1 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGLPV2.1
+ */
+
+/**
+ * @author  Clément Foucher <clement.foucher@laas.fr>
+ */
+#ifndef OWNTECH_OPAMP3_DRIVER_H_
+#define OWNTECH_OPAMP3_DRIVER_H_
+
+
+// Public header
+#include "opamp3.h"
+#include "stm32_ll_opamp.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define OPAMP3_GPIO_NODE  DT_ALIAS(opamp3)
+#define OPAMP3_GPIO_LABEL DT_GPIO_LABEL(OPAMP3_GPIO_NODE, gpios)
+#define OPAMP3_GPIO_PIN   DT_GPIO_PIN(OPAMP3_GPIO_NODE, gpios)
+#define OPAMP3_GPIO_FLAGS DT_GPIO_FLAGS(OPAMP3_GPIO_NODE, gpios)
+
+static int opamp3_init(const struct device* dev);
+
+static LL_OPAMP_InitTypeDef OPAMP_InitStruct = {0};
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // OWNTECH_NGND_DRIVER_H_

zephyr/nucleo_g474re.overlay

 #include "dts/hrtim.dtsi"
 #include "dts/adc-channels.dtsi"
 #include "dts/ngnd.dtsi"
+#include "dts/opamp3.dtsi"	
 
 /*******/
 /* ADC */

zephyr/prj.conf

@@ -47,3 +47,4 @@ CONFIG_ASSERT=y
 #CONFIG_OWNTECH_VREFBUF_DRIVER=n
 #CONFIG_OWNTECH_DAC_DRIVER=n
 #CONFIG_OWNTECH_COMPARATOR_DRIVER=n
+#CONFIG_OWNTECH_OPAMP3_DRIVER=n