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92 lines
2.9 KiB
92 lines
2.9 KiB
// Copyright (c) 2015, Jacques Supcik, HEIA-FR
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the <organization> nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/*
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Interface to ws2811 chip (neopixel driver). Make sure that you have
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ws2811.h, rpihw.h, and pwm.h in a GCC include path (e.g. /usr/local/include) and
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libws2811.a in a GCC library path (e.g. /usr/local/lib).
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See https://github.com/jgarff/rpi_ws281x for instructions
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*/
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package ws2811
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/*
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#cgo CFLAGS: -std=c99
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#cgo LDFLAGS: -lws2811
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#include "ws2811.go.h"
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*/
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import "C"
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import (
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"errors"
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"fmt"
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"unsafe"
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)
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func Init(gpioPin int, ledCount int, brightness int) error {
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C.ledstring.channel[0].gpionum = C.int(gpioPin)
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C.ledstring.channel[0].count = C.int(ledCount)
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C.ledstring.channel[0].brightness = C.uint8_t(brightness)
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res := int(C.ws2811_init(&C.ledstring))
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if res == 0 {
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return nil
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} else {
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return errors.New(fmt.Sprintf("Error ws2811.init.%d", res))
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}
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}
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func Fini() {
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C.ws2811_fini(&C.ledstring)
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}
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func Render() error {
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res := int(C.ws2811_render(&C.ledstring))
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if res == 0 {
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return nil
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} else {
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return errors.New(fmt.Sprintf("Error ws2811.render.%d", res))
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}
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}
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func Wait() error {
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res := int(C.ws2811_wait(&C.ledstring))
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if res == 0 {
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return nil
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} else {
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return errors.New(fmt.Sprintf("Error ws2811.wait.%d", res))
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}
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}
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func SetLed(index int, value uint32) {
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C.ws2811_set_led(&C.ledstring, C.int(index), C.uint32_t(value))
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}
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func Clear() {
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C.ws2811_clear(&C.ledstring)
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}
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func SetBitmap(a []uint32) {
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C.ws2811_set_bitmap(&C.ledstring, unsafe.Pointer(&a[0]), C.int(len(a)*4))
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}
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