Add Comparator driver module.

zephyr/modules/owntech_comparator_driver/zephyr/CMakeLists.txt

+if(CONFIG_OWNTECH_COMPARATOR_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/comparator_driver.c
+    )
+endif()

zephyr/modules/owntech_comparator_driver/zephyr/Kconfig

+config OWNTECH_COMPARATOR_DRIVER
+	bool "Enable OwnTech comparator driver for STM32"
+	default y

zephyr/modules/owntech_comparator_driver/zephyr/module.yml

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

zephyr/modules/owntech_comparator_driver/zephyr/public_include/comparator.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 COMPARATOR_H_
+#define COMPARATOR_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void comparator_init();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // COMPARATOR_H_

zephyr/modules/owntech_comparator_driver/zephyr/src/comparator_driver.c

+/*
+ * 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>
+ */
+
+
+// Zephyr
+#include <zephyr.h>
+
+// STM32 LL
+#include <stm32_ll_comp.h>
+#include <stm32_ll_gpio.h>
+#include <stm32_ll_bus.h>
+
+// Current file header
+#include "comparator_driver.h"
+
+
+void comparator_init()
+{
+	_comparator_gpio_init();
+	_comparator_comp1_init();
+	_comparator_comp3_init();
+}
+
+
+static void _comparator_gpio_init()
+{
+	// TODO : use Zephyr gpio_pin_configure
+
+	/*
+	COMP1 GPIO Configuration
+		PA1       ------> COMP1_INP
+		PB8-BOOT0 ------> COMP1_OUT
+	COMP3 GPIO Configuration
+		PC1       ------> COMP3_INP
+		PB15      ------> COMP3_OUT
+	*/
+
+	LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
+	LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
+	LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
+
+	// Pin A.1 (cmp 1)
+	LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_1, LL_GPIO_PULL_NO);
+	LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_1, LL_GPIO_MODE_ANALOG);
+
+	// Pin C.1 (cmp 3)
+	LL_GPIO_SetPinPull(GPIOC, LL_GPIO_PIN_1, LL_GPIO_PULL_NO);
+	LL_GPIO_SetPinMode(GPIOC, LL_GPIO_PIN_1, LL_GPIO_MODE_ANALOG);
+}
+
+static void _comparator_comp1_init()
+{
+	LL_COMP_ConfigInputs(COMP1, LL_COMP_INPUT_MINUS_DAC1_CH1, LL_COMP_INPUT_PLUS_IO1);
+	LL_COMP_SetInputHysteresis(COMP1, LL_COMP_HYSTERESIS_NONE);
+	LL_COMP_SetOutputPolarity(COMP1, LL_COMP_OUTPUTPOL_NONINVERTED);
+	LL_COMP_SetOutputBlankingSource(COMP1, LL_COMP_BLANKINGSRC_NONE);
+
+	k_busy_wait(LL_COMP_DELAY_VOLTAGE_SCALER_STAB_US);
+
+	LL_EXTI_DisableEvent_0_31(LL_EXTI_LINE_21);
+	LL_EXTI_DisableIT_0_31(LL_EXTI_LINE_21);
+
+	LL_COMP_Enable(COMP1);
+}
+
+static void _comparator_comp3_init()
+{
+	LL_COMP_ConfigInputs(COMP3, LL_COMP_INPUT_MINUS_DAC3_CH1, LL_COMP_INPUT_PLUS_IO2);
+	LL_COMP_SetInputHysteresis(COMP3, LL_COMP_HYSTERESIS_NONE);
+	LL_COMP_SetOutputPolarity(COMP3, LL_COMP_OUTPUTPOL_NONINVERTED);
+	LL_COMP_SetOutputBlankingSource(COMP3, LL_COMP_BLANKINGSRC_NONE);
+
+	k_busy_wait(LL_COMP_DELAY_VOLTAGE_SCALER_STAB_US);
+
+	LL_EXTI_DisableEvent_0_31(LL_EXTI_LINE_29);
+	LL_EXTI_DisableIT_0_31(LL_EXTI_LINE_29);
+
+	LL_COMP_Enable(COMP3);
+}

zephyr/modules/owntech_comparator_driver/zephyr/src/comparator_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 COMPARATOR_DRIVER_H_
+#define COMPARATOR_DRIVER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static void _comparator_comp1_init();
+static void _comparator_comp3_init();
+static void _comparator_gpio_init();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // COMPARATOR_DRIVER_H_

zephyr/prj.conf

@@ -46,3 +46,4 @@ CONFIG_ASSERT=y
 #CONFIG_OWNTECH_DATA_ACQUISITION=n
 #CONFIG_OWNTECH_VREFBUF_DRIVER=n
 #CONFIG_OWNTECH_DAC_DRIVER=n
+#CONFIG_OWNTECH_COMPARATOR_DRIVER=n