drivers/ir_nec: ir remote implementation

dist/tools/doccheck/exclude_patterns

@@ -10084,6 +10084,8 @@ drivers/io1_xplained/include/io1_xplained_internals\.h:[0-9]+: warning: Member I
 drivers/io1_xplained/include/io1_xplained_params\.h:[0-9]+: warning: Member IO1_XPLAINED_PARAMS \(macro definition\) of file io1_xplained_params\.h is not documented\.
 drivers/io1_xplained/include/io1_xplained_params\.h:[0-9]+: warning: Member IO1_XPLAINED_PARAM_ADDR \(macro definition\) of file io1_xplained_params\.h is not documented\.
 drivers/io1_xplained/include/io1_xplained_params\.h:[0-9]+: warning: Member IO1_XPLAINED_SAUL_INFO \(macro definition\) of file io1_xplained_params\.h is not documented\.
+drivers/ir_nec/include/ir_nec_params\.h:35: warning: Member IR_NEC_PARAM_PIN \(macro definition\) of file ir_nec_params\.h is not documented\.
+drivers/ir_nec/include/ir_nec_params\.h:39: warning: Member IR_NEC_PARAMS \(macro definition\) of file ir_nec_params\.h is not documented\.
 drivers/isl29020/include/isl29020\-internal\.h:[0-9]+: warning: Member ISL29020_CMD_EN \(macro definition\) of file isl29020\-internal\.h is not documented\.
 drivers/isl29020/include/isl29020\-internal\.h:[0-9]+: warning: Member ISL29020_CMD_LIGHT \(macro definition\) of file isl29020\-internal\.h is not documented\.
 drivers/isl29020/include/isl29020\-internal\.h:[0-9]+: warning: Member ISL29020_CMD_MODE \(macro definition\) of file isl29020\-internal\.h is not documented\.

drivers/include/ir_nec.h

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2022 Dario Petrillo
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup    drivers_ir_nec IR NEC Remote receiver
+ * @ingroup     drivers_misc
+ * @brief       Receives commands from NEC IR remotes
+ *
+ * @{
+ *
+ * @file
+ *
+ * @author      Dario Petrillo <dario.pk1@gmail.com>
+ */
+
+#ifndef IR_NEC_H
+#define IR_NEC_H
+
+#include <stdint.h>
+
+#include "isrpipe.h"
+#include "periph/gpio.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   NEC command structure
+ */
+typedef struct {
+    uint8_t addr;   /**< Address (usually 0, depends on the remote) */
+    uint8_t cmd;    /**< Command */
+} ir_nec_cmd_t;
+
+/**
+ * @brief   Device initialization parameters
+ */
+typedef struct {
+    gpio_t pin;     /**< Input pin */
+} ir_nec_params_t;
+
+/**
+ * @brief   Device descriptor for the driver
+ */
+typedef struct {
+    gpio_t pin;             /**< Input pin */
+    isrpipe_t isrpipe;      /**< Internal pipe for commands */
+
+    uint32_t last_rising;   /**< Timestamp of the last rising edge */
+    uint32_t data;          /**< Data packet being received */
+    uint8_t read_bits;      /**< Number of bits read so far. 0xff if not currently reading */
+
+    uint8_t isrpipe_buf[2 * sizeof(ir_nec_cmd_t)];  /**< Buffer for the isrpipe */
+} ir_nec_t;
+
+/**
+ * @brief   Initialize the given device
+ *
+ * @param[inout] dev        Device descriptor of the driver
+ * @param[in]    params     Initialization parameters
+ *
+ * @return                  0 on success
+ */
+int ir_nec_init(ir_nec_t *dev, const ir_nec_params_t *params);
+
+/**
+ * @brief   Read a command packet. Blocks until one is received
+ *
+ * @param[inout] dev        Device descriptor of the driver
+ * @param[out]   command    Structure to write the result into
+ *
+ * @retval       0          Success
+ * @retval       -1         Isrpipe returned too few bytes. Should never happen
+ */
+int ir_nec_read(ir_nec_t *dev, ir_nec_cmd_t *command);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IR_NEC_H */
+/** @} */

drivers/ir_nec/Kconfig

@@ -0,0 +1,13 @@
+# Copyright (c) 2022 Dario Petrillo
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+config MODULE_IR_NEC
+    bool "IR NEC Remote receiver"
+    depends on TEST_KCONFIG
+    select MODULE_ISRPIPE
+    select MODULE_PERIPH_GPIO_IRQ
+    select MODULE_ZTIMER
+    select MODULE_ZTIMER_USEC

drivers/ir_nec/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

drivers/ir_nec/Makefile.dep

@@ -0,0 +1,4 @@
+FEATURES_REQUIRED += periph_gpio
+FEATURES_REQUIRED += periph_gpio_irq
+USEMODULE += isrpipe
+USEMODULE += ztimer_usec

drivers/ir_nec/Makefile.include

@@ -0,0 +1,2 @@
+USEMODULE_INCLUDES_ir_nec := $(LAST_MAKEFILEDIR)/include
+USEMODULE_INCLUDES += $(USEMODULE_INCLUDES_ir_nec)

drivers/ir_nec/include/ir_nec_constants.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2022 Dario Petrillo
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_ir_nec
+ * @{
+ *
+ * @file
+ * @brief       Internal addresses, registers and constants
+ *
+ * @author      Dario Petrillo <dario.pk1@gmail.com>
+ */
+
+#ifndef IR_NEC_CONSTANTS_H
+#define IR_NEC_CONSTANTS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define IR_NEC_START_US 4500 /**< Width of the start pulse, in microseconds */
+#define IR_NEC_ZERO_US 562   /**< Width of the zero pulse, in microseconds */
+#define IR_NEC_ONE_US 1687   /**< Width of the one pulse, in microseconds */
+#define IR_NEC_EPS_US 350    /**< Maximum timing deviation for value detection, in microseconds */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IR_NEC_CONSTANTS_H */
+/** @} */

drivers/ir_nec/include/ir_nec_params.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2022 Dario Petrillo
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_ir_nec
+ *
+ * @{
+ * @file
+ * @brief       Default configuration
+ *
+ * @author      Dario Petrillo <dario.pk1@gmail.com>
+ */
+
+#ifndef IR_NEC_PARAMS_H
+#define IR_NEC_PARAMS_H
+
+#include "board.h"
+#include "ir_nec.h"
+#include "ir_nec_constants.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name    Set default configuration parameters
+ * @{
+ */
+#ifndef IR_NEC_PARAM_PIN
+#define IR_NEC_PARAM_PIN    GPIO_UNDEF
+#endif
+
+#ifndef IR_NEC_PARAMS
+#define IR_NEC_PARAMS   { .pin = IR_NEC_PARAM_PIN }
+#endif
+/**@}*/
+
+/**
+ * @brief   Configuration struct
+ */
+static const ir_nec_params_t ir_nec_params[] =
+{
+    IR_NEC_PARAMS
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* IR_NEC_PARAMS_H */
+/** @} */

drivers/ir_nec/ir_nec.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2022 Dario Petrillo
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_ir_nec
+ * @{
+ *
+ * @file
+ * @brief       Device driver implementation for the IR NEC Remote receiver
+ *
+ * @author      Dario Petrillo <dario.pk1@gmail.com>
+ *
+ * @}
+ */
+
+#include "ir_nec.h"
+#include "ir_nec_constants.h"
+#include "ir_nec_params.h"
+
+#include <stdlib.h>
+#include "ztimer.h"
+
+#include "ir_nec.h"
+
+static void ir_nec_isr(void *arg)
+{
+    ir_nec_t *ir = (ir_nec_t *)arg;
+
+    if (gpio_read(ir->pin) != 0) { // rising edge
+        ir->last_rising = ztimer_now(ZTIMER_USEC);
+    }
+    else { // falling edge
+        int length = ztimer_now(ZTIMER_USEC) - ir->last_rising;
+
+        if (abs(length - IR_NEC_START_US) <= IR_NEC_EPS_US) {
+            ir->data = 0;
+            ir->read_bits = 0;
+        }
+        else if ((length - IR_NEC_ZERO_US) <= IR_NEC_EPS_US && ir->read_bits < 32) {
+            ir->data = (ir->data << 1);
+            ir->read_bits++;
+        }
+        else if (abs(length - IR_NEC_ONE_US) <= IR_NEC_EPS_US && ir->read_bits < 32) {
+            ir->data = (ir->data << 1) | 1;
+            ir->read_bits++;
+        }
+        else { // Interpacket delay
+            ir->read_bits = 0xff;
+        }
+
+        if (ir->read_bits == 32) {
+            ir->read_bits = 0xff;
+
+            uint8_t addr = (ir->data >> 24) & 0xff;
+            uint8_t addr_inv = (ir->data >> 16) & 0xff;
+            uint8_t cmd = (ir->data >> 8) & 0xff;
+            uint8_t cmd_inv = ir->data & 0xff;
+
+            if ((addr ^ addr_inv) == 0xff && (cmd ^ cmd_inv) == 0xff) {
+                ir_nec_cmd_t command = { .addr = addr, .cmd = cmd };
+                isrpipe_write(&ir->isrpipe, (void*)&command, sizeof(command));
+            }
+        }
+    }
+}
+
+int ir_nec_read(ir_nec_t *ir, ir_nec_cmd_t *command)
+{
+    int to_read = sizeof(ir_nec_cmd_t);
+    if (isrpipe_read(&ir->isrpipe, (void*)command, to_read) != to_read) {
+        return -1;
+    }
+    return 0;
+}
+
+int ir_nec_init(ir_nec_t *ir, const ir_nec_params_t *params)
+{
+    ir->pin = params->pin;
+    ir->data = 0;
+    ir->last_rising = 0;
+    ir->read_bits = 0;
+
+    isrpipe_init(&ir->isrpipe, ir->isrpipe_buf, sizeof(ir->isrpipe_buf));
+    gpio_init_int(ir->pin, GPIO_IN, GPIO_BOTH, ir_nec_isr, ir);
+
+    return 0;
+}