drivers: add grove ledbar driver

drivers/Makefile.dep

@@ -168,6 +168,10 @@ ifneq (,$(filter mtd_sdcard,$(USEMODULE)))
     USEMODULE += sdcard_spi
 endif
 
+ifneq (,$(filter grove_ledbar,$(USEMODULE)))
+    USEMODULE += my9221
+endif
+
 ifneq (,$(filter my9221,$(USEMODULE)))
     FEATURES_REQUIRED += periph_gpio
     USEMODULE += xtimer

drivers/Makefile.include

@@ -13,6 +13,9 @@ endif
 ifneq (,$(filter ds1307,$(USEMODULE)))
     USEMODULE_INCLUDES += $(RIOTBASE)/drivers/ds1307/include
 endif
+ifneq (,$(filter grove_ledbar,$(USEMODULE)))
+    USEMODULE_INCLUDES += $(RIOTBASE)/drivers/grove_ledbar/include
+endif
 ifneq (,$(filter kw2xrf,$(USEMODULE)))
     USEMODULE_INCLUDES += $(RIOTBASE)/drivers/kw2xrf/include
 endif

drivers/grove_ledbar/Makefile

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

drivers/grove_ledbar/grove_ledbar.c

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2017 HAW Hamburg
+ *
+ * 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_grove_ledbar
+ *
+ * @{
+ * @file
+ * @brief       Driver for the Grove ledbar
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ *
+ * @}
+ */
+
+#include <assert.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "log.h"
+#include "xtimer.h"
+
+#include "grove_ledbar.h"
+#include "my9221.h"
+
+#define DEV_LEDS            (dev->params.leds)
+#define DEV_STATE(x)        (dev->state[x])
+
+int grove_ledbar_init(grove_ledbar_t *dev, const grove_ledbar_params_t *params)
+{
+    assert(dev && params);
+
+    return my9221_init((my9221_t *)dev, (my9221_params_t *)params);
+}
+
+void grove_ledbar_set(grove_ledbar_t *dev, uint8_t level)
+{
+    assert(dev);
+
+    uint8_t frac = GROVE_LEDBAR_MAX / DEV_LEDS;
+
+    for (unsigned i = 0; i < DEV_LEDS; ++i) {
+        if (level > frac) {
+            DEV_STATE(i) = MY9221_LED_ON;
+            level -= frac;
+        }
+        else if (level > 0) {
+            DEV_STATE(i) = ~(MY9221_LED_ON << ((level << 3) / frac));
+            level = 0;
+        }
+        else {
+            DEV_STATE(i) = MY9221_LED_OFF;
+        }
+    }
+    my9221_set_state((my9221_t *)dev, NULL, 0);
+}
+
+void grove_ledbar_clear(grove_ledbar_t *dev)
+{
+    assert(dev);
+
+    grove_ledbar_set(dev, 0);
+}

drivers/grove_ledbar/include/grove_ledbar_params.h

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 HAW Hamburg
+ *
+ * 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_grove_ledbar
+ *
+ * @{
+ * @file
+ * @brief       Config for the Grove LED bar based on MY9221 LED controller
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ */
+#ifndef GROVE_LEDBAR_PARAMS_H
+#define GROVE_LEDBAR_PARAMS_H
+
+#include "board.h"
+#include "periph/gpio.h"
+
+#include "grove_ledbar.h"
+#include "my9221.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/**
+ * @brief   Clock GPIO pin
+ */
+#ifndef GROVE_LEDBAR_CLK
+#define GROVE_LEDBAR_CLK        (GPIO_PIN(0,1))
+#endif
+
+/**
+ * @brief   Data GPIO pin
+ */
+#ifndef GROVE_LEDBAR_DAT
+#define GROVE_LEDBAR_DAT        (GPIO_PIN(0,2))
+#endif
+
+/**
+ * @brief   Direction of LEDs
+ */
+#ifndef GROVE_LEDBAR_DIR
+#define GROVE_LEDBAR_DIR        GROVE_LEDBAR_G2R
+#endif
+
+/**
+ * @brief   Default parameter settings
+ */
+#define GROVE_LEDBAR_PARAMS {       \
+    .leds       = 10,               \
+    .dir        = GROVE_LEDBAR_DIR, \
+    .clk        = GROVE_LEDBAR_CLK, \
+    .dat        = GROVE_LEDBAR_DAT, \
+}
+
+/**
+ * @brief   Grove LED bar configuration
+ */
+static const grove_ledbar_params_t grove_ledbar_params[] =
+{
+#ifdef GROVE_LEDBAR_CUSTOM
+    GROVE_LEDBAR_CUSTOM,
+#else
+    GROVE_LEDBAR_PARAMS,
+#endif
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GROVE_LEDBAR_PARAMS_H */
+/** @} */

drivers/include/grove_ledbar.h

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2017 HAW Hamburg
+ *
+ * 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_grove_ledbar Grove ledbar
+ * @ingroup     drivers_actuators
+ * @brief       Driver for the Grove ledbar
+ *
+ * @{
+ * @file
+ * @brief       Interface for the Grove ledbar driver
+ *
+ * @author      Sebastian Meiling <s@mlng.net>
+ */
+
+#ifndef GROVE_LEDBAR_H
+#define GROVE_LEDBAR_H
+
+#include <stdint.h>
+
+#include "my9221.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name	Ledbar direction, either red to green, or vice versa.
+ * @{
+ */
+#define GROVE_LEDBAR_R2G        MY9221_DIR_FWD
+#define GROVE_LEDBAR_G2R        MY9221_DIR_REV
+/** @} */
+
+/**
+ * @brief 	Maximum value for ledbar level
+ */
+#define GROVE_LEDBAR_MAX        UINT8_MAX
+
+/**
+ * @brief   Parameters needed for device initialization
+ */
+typedef my9221_params_t grove_ledbar_params_t;
+
+/**
+ * @brief   Device descriptor for grove ledbar, alias for MY9221 LED controller
+ */
+typedef my9221_t grove_ledbar_t;
+
+/**
+ * @brief 	Initialize the given driver
+ *
+ * @pre `dev != NULL` and `params != NULL`
+ *
+ * @param[out]  dev         device descriptor grove ledbar
+ * @param[in]   params      configuration parameters
+ *
+ * @return                  0 on success, otherwise error
+ */
+int grove_ledbar_init(grove_ledbar_t *dev, const grove_ledbar_params_t *params);
+
+/**
+ * @brief 	Set overall (brightness) level distributed over all LEDs
+ *
+ * @pre `dev != NULL`
+ *
+ * @param[in]   dev         device descriptor grove ledbar
+ * @param[in]   level       overall brightness level
+ */
+void grove_ledbar_set(grove_ledbar_t *dev, uint8_t level);
+
+/**
+ * @brief 	Clear ledbar, i.e. set all LEDs off
+ *
+ * @pre `dev != NULL`
+ *
+ * @param[in]   dev         device descriptor grove ledbar
+ */
+void grove_ledbar_clear(grove_ledbar_t *dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GROVE_LEDBAR_H */
+/** @} */