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68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/*
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* Copyright (C) 2017 HAW Hamburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_grove_ledbar
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*
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* @{
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* @file
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* @brief Driver for the Grove ledbar
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*
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* @author Sebastian Meiling <s@mlng.net>
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*
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* @}
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#include "log.h"
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#include "grove_ledbar.h"
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#include "my9221.h"
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#define DEV_LEDS (dev->params.leds)
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#define DEV_STATE(x) (dev->state[x])
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int grove_ledbar_init(grove_ledbar_t *dev, const grove_ledbar_params_t *params)
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{
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assert(dev && params);
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return my9221_init((my9221_t *)dev, (my9221_params_t *)params);
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}
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void grove_ledbar_set(grove_ledbar_t *dev, uint8_t level)
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{
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assert(dev);
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uint8_t frac = GROVE_LEDBAR_MAX / DEV_LEDS;
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for (unsigned i = 0; i < DEV_LEDS; ++i) {
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if (level > frac) {
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DEV_STATE(i) = MY9221_LED_ON;
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level -= frac;
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}
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else if (level > 0) {
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DEV_STATE(i) = ~(MY9221_LED_ON << ((level << 3) / frac));
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level = 0;
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}
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else {
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DEV_STATE(i) = MY9221_LED_OFF;
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}
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}
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my9221_set_state((my9221_t *)dev, NULL, 0);
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}
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void grove_ledbar_clear(grove_ledbar_t *dev)
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{
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assert(dev);
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grove_ledbar_set(dev, 0);
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}
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