Added simple ws2812 example
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curuvar
Xiang Xiao
parent
943df4cb60
commit
ca4ef69661
2
.gitignore
vendored
2
.gitignore
vendored
@ -31,3 +31,5 @@ Make.dep
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.context
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# nuttx/$(TOPDIR)/Makefile.[unix|win]::$(DIRLINKS_EXTERNAL_DIRS)
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.dirlinks
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.vscode
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.DS_Store
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33
examples/ws2812/Kconfig
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33
examples/ws2812/Kconfig
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@ -0,0 +1,33 @@
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config EXAMPLES_WS2812
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tristate "ws2812 Demo Program"
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default n
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---help---
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Enable the ws2812 demo
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if EXAMPLES_WS2812
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config EXAMPLES_WS2812_PROGNAME
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string "Program Name"
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default "ws2812"
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---help---
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This is the name of the program that will be used when the NSH ELF
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program is installed.
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config EXAMPLES_WS2812_PRIORITY
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int "Task Priority"
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default 100
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config EXAMPLES_WS2812_STACKSIZE
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int "Stack Size"
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default DEFAULT_TASK_STACKSIZE
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config EXAMPLES_WS2812_DEFAULT_DEV
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string "Default Device"
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default "/dev/leds0"
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endif
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23
examples/ws2812/Make.defs
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23
examples/ws2812/Make.defs
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@ -0,0 +1,23 @@
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############################################################################
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# apps/examples/ws2812/Make.defs
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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ifneq ($(CONFIG_EXAMPLES_WS2812),)
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CONFIGURED_APPS += $(APPDIR)/examples/ws2812
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endif
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32
examples/ws2812/Makefile
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32
examples/ws2812/Makefile
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@ -0,0 +1,32 @@
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############################################################################
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# apps/examples/ws2812/Makefile
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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include $(APPDIR)/Make.defs
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# MTD R/W buffer test Example
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PROGNAME = $(CONFIG_EXAMPLES_WS2812_PROGNAME)
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PRIORITY = $(CONFIG_EXAMPLES_WS2812_PRIORITY)
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STACKSIZE = $(CONFIG_EXAMPLES_WS2812_STACKSIZE)
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MODULE = $(CONFIG_EXAMPLES_WS2812)
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MAINSRC = ws2812_main.c
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include $(APPDIR)/Application.mk
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315
examples/ws2812/ws2812_main.c
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315
examples/ws2812/ws2812_main.c
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@ -0,0 +1,315 @@
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/****************************************************************************
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* apps/examples/ws2812/ws2812_main.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <debug.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <nuttx/leds/ws2812.h>
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct neo_config_s
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{
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FAR char *path;
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int loops;
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int leds;
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int delay;
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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struct neo_config_s config =
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{
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NULL, /* path - default set in main */
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4, /* loop - all colors 4 times */
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CONFIG_WS2812_LED_COUNT, /* leds - based on config */
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20000 /* delay - (in µs) ~50Hz */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: help
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****************************************************************************/
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static void help(FAR struct neo_config_s *conf)
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{
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printf("Usage: ws2812 [OPTIONS]\n");
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printf("\nArguments are \"sticky\". "
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"For example, once the device path is\n");
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printf("specified, that path will be re-used until it is changed.\n");
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printf(" [-p path] selects the ws2812 device. "
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"Default: %s Current: %s\n",
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CONFIG_EXAMPLES_WS2812_DEFAULT_DEV, conf->path ? conf->path
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: "NONE");
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printf(" [-l leds] selects number of ws2812s in the chain. "
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"Default: %d Current: %d\n",
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CONFIG_WS2812_LED_COUNT, conf->leds);
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printf(" [-r repeat] selects the number change cycles. "
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"Default: %d Current: %d\n",
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4, conf->loops);
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printf(" [-d delay] selects delay between updates. "
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"Default: %d us Current: %d us\n",
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20000, conf->delay);
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}
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/****************************************************************************
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* Name: set_devpath
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****************************************************************************/
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static void set_devpath(FAR struct neo_config_s *conf,
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FAR const char *devpath)
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{
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/* Get rid of any old device path */
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if (conf->path != NULL)
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{
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free(conf->path);
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}
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/* Then set-up the new device path by copying the string */
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conf->path = strdup(devpath);
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}
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/****************************************************************************
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* Name: arg_string
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****************************************************************************/
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static int arg_string(FAR char **arg, FAR char **value)
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{
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FAR char *ptr = *arg;
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if (ptr[2] == '\0')
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{
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*value = arg[1];
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return 2;
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}
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else
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{
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*value = &ptr[2];
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return 1;
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}
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}
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/****************************************************************************
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* Name: arg_decimal
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****************************************************************************/
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static int arg_decimal(FAR char **arg, FAR long *value)
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{
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FAR char *string;
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int ret;
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ret = arg_string(arg, &string);
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*value = strtol(string, NULL, 10);
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return ret;
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}
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/****************************************************************************
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* Name: parse_args
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****************************************************************************/
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static void parse_args(FAR struct neo_config_s *conf,
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int argc,
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FAR char **argv)
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{
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FAR char *ptr;
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FAR char *str;
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long value;
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int index;
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int nargs;
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for (index = 1; index < argc; )
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{
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ptr = argv[index];
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if (ptr[0] != '-')
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{
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fprintf(stderr, "Invalid options format: %s\n", ptr);
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exit(1);
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}
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switch (ptr[1])
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{
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case 'l':
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nargs = arg_decimal(&argv[index], &value);
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if (value < 1 || value > INT_MAX)
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{
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fprintf(stderr, "Led count out of range: %ld\n", value);
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exit(1);
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}
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conf->leds = (uint32_t)value;
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index += nargs;
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break;
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case 'r':
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nargs = arg_decimal(&argv[index], &value);
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if (value < 1 || value > INT_MAX)
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{
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fprintf(stderr, "Repeat out of range: %ld\n", value);
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exit(1);
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}
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conf->loops = (uint32_t)value;
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index += nargs;
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break;
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case 'p':
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nargs = arg_string(&argv[index], &str);
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set_devpath(conf, str);
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index += nargs;
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break;
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case 'd':
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nargs = arg_decimal(&argv[index], &value);
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if (value < 1 || value > INT_MAX)
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{
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fprintf(stderr, "Delay out of range: %ld\n", value);
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exit(1);
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}
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conf->delay = (int)value;
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index += nargs;
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break;
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case 'h':
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help(conf);
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exit(0);
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default:
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fprintf(stderr, "Unsupported option: %s\n", ptr);
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help(conf);
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exit(1);
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}
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* ws2812_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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FAR uint32_t *buffer;
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FAR uint32_t *bp;
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ssize_t result;
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if (config.path == NULL)
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{
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config.path = strdup(CONFIG_EXAMPLES_WS2812_DEFAULT_DEV);
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}
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/* Parse the command line */
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parse_args(&config, argc, argv);
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/* Run the display loop */
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int fd = open(config.path, O_WRONLY);
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if (fd < 0)
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{
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fprintf(stderr,
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"ws2812_main: open %s failed: %d\n",
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config.path,
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errno);
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goto errout;
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}
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buffer = calloc(4, config.leds);
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if (buffer == NULL)
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{
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fprintf(stderr, "ws2812_main: buffer allocation failed: %d\n", errno);
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goto errout;
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}
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for (int i = 0; i < config.loops; ++i)
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{
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for (int j = 0; j < 256; ++j)
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{
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bp = buffer;
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for (int k = 0; k < config.leds; ++k)
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{
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*bp++ = ws2812_gamma_correct(
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ws2812_hsv_to_rgb((j + k) & 0xff,
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0xff,
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0xff));
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}
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lseek(fd, 0, SEEK_SET);
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result = write(fd, buffer, 4 * config.leds);
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if (result != 4 * config.leds)
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{
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fprintf(stderr,
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"ws2812_main: write failed: %d %d\n",
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result,
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errno);
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goto errout_with_dev;
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}
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usleep(config.delay);
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}
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}
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free(buffer);
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close(fd);
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fflush(stdout);
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return OK;
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errout_with_dev:
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close(fd);
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errout:
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fflush(stdout);
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return ERROR;
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}
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