examples/light_ws2812,pkg/light_ws812: added lightweight (assembly ba…

…sed) ws2812 package, and example app using it

examples/light_ws2812/Makefile

@@ -0,0 +1,28 @@
+# name of the application
+APPLICATION = light_ws2812
+
+# If no BOARD is found in the environment, use this default:
+BOARD ?= nucleo-g070rb
+
+# This has to be the absolute path to the RIOT base directory:
+RIOTBASE ?= $(CURDIR)/../..
+
+# required packages
+USEPKG += light_ws2812
+USEMODULE += xtimer
+USEMODULE += random
+
+# Comment this out to disable code in RIOT that does safety checking
+# which is not needed in a production environment but helps in the
+# development process:
+DEVELHELP ?= 1
+
+# Change this to 0 show compiler invocation lines by default:
+QUIET ?= 1
+
+CFLAGS += -DLIGHT_WS2812_UC_STM32G0XX
+
+CFLAGS += -DLIGHT_WS2812_GPIO_PIN=7
+CFLAGS += -DLIGHT_WS2812_GPIO_PORT=GPIOA
+
+include $(RIOTBASE)/Makefile.include

examples/light_ws2812/README.md

@@ -0,0 +1,9 @@
+light_ws2812
+============
+
+Demonstrates using the light_ws2812 package to drive some LEDs
+
+Usage
+=====
+
+Uses the random module to generate random numbers to write out to the LEDs

examples/light_ws2812/main.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2022 BISSELL Homecare, Inc.
+ *
+ * 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     examples
+ * @{
+ *
+ * @file
+ * @brief       light ws2812 example
+ *
+ * @author      Dave VanKampen <[email protected]>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include "light_ws2812_cortex.h"
+#include "xtimer.h"
+#include "random.h"
+#define SEED 234
+
+#define NUM_LEDS    5
+uint8_t leds[NUM_LEDS] = { 0x00};
+int main(void)
+{
+    puts("Generated RIOT application: 'light_ws2812'");
+    random_init(SEED);
+    while(1) {
+        for (uint8_t idx = 0; idx < NUM_LEDS; idx++) {
+            leds[idx] = (uint8_t)random_uint32();
+        }
+        ws2812_sendarray(leds, NUM_LEDS);
+        xtimer_usleep(50000);
+    }
+    return 0;
+}

pkg/light_ws2812/Makefile

@@ -0,0 +1,9 @@
+PKG_NAME=light_ws2812
+PKG_URL=https://github.com/cpldcpu/light_ws2812.git
+PKG_VERSION=cd149996012fe96bc3d7883cb18a0103fd8e8b3a
+PKG_LICENSE=GPL-3
+
+include $(RIOTBASE)/pkg/pkg.mk
+
+all:
+	$(QQ)"$(MAKE)" -C $(PKG_SOURCE_DIR)/light_ws2812_ARM/ -f $(CURDIR)/$(PKG_NAME).mk

pkg/light_ws2812/Makefile.dep

@@ -0,0 +1,4 @@
+# Put the package dependencies here
+
+# required features
+FEATURES_REQUIRED += periph_gpio

pkg/light_ws2812/Makefile.include

@@ -0,0 +1 @@
+INCLUDES += -I$(PKGDIRBASE)/light_ws2812/light_ws2812_ARM

pkg/light_ws2812/doc.txt

@@ -0,0 +1,15 @@
+/**
+ * @defgroup pkg_light_ws2812   light_ws2812
+ * @ingroup  pkg
+ * @brief    lightweight ws2811/2812 driver
+ *
+ * # Introduction
+ *
+ * Lightweight package for controlling ws281x LEDs
+ *
+ * # License
+ *
+ * Licensed under GPL-3.
+ *
+ * @see      https://github.com/cpldcpu/light_ws2812.git
+ */

pkg/light_ws2812/light_ws2812.mk

@@ -0,0 +1,3 @@
+MODULE = light_ws2812
+
+include $(RIOTBASE)/Makefile.base

pkg/light_ws2812/patches/0001-stm32g0-changes-for-RIOT-compatibility.patch

@@ -0,0 +1,75 @@
+From c5eaf14a5e26b0f325ab1edb9d0ac599f86519ba Mon Sep 17 00:00:00 2001
+From: Dave VanKampen <[email protected]>
+Date: Fri, 4 Feb 2022 10:18:39 -0500
+Subject: [PATCH] stm32g0 changes for RIOT compatibility
+
+---
+ light_ws2812_ARM/light_ws2812_cortex.c |  4 ++--
+ light_ws2812_ARM/light_ws2812_cortex.h | 14 ++++++++++++--
+ 2 files changed, 14 insertions(+), 4 deletions(-)
+
+diff --git a/light_ws2812_ARM/light_ws2812_cortex.c b/light_ws2812_ARM/light_ws2812_cortex.c
+index a183888..7a21340 100644
+--- a/light_ws2812_ARM/light_ws2812_cortex.c
++++ b/light_ws2812_ARM/light_ws2812_cortex.c
+@@ -34,13 +34,13 @@ void ws2812_sendarray(uint8_t *data,int datlen)
+ 	uint32_t masklo = ws2812_mask_clr;
+ 	volatile uint32_t *set = ws2812_port_set;
+ 	volatile uint32_t *clr = ws2812_port_clr;
+-	uint32_t i;
++	uint32_t i = 0;
+ 	uint32_t curbyte;
+
+ 	while (datlen--) {
+ 		curbyte=*data++;
+
+-	asm volatile(
++	__asm__ volatile(
+ 			"		lsl %[dat],#24				\n\t"
+ 			"		movs %[ctr],#8				\n\t"
+ 			"ilop%=:							\n\t"
+diff --git a/light_ws2812_ARM/light_ws2812_cortex.h b/light_ws2812_ARM/light_ws2812_cortex.h
+index 6c43cbe..c7389b3 100644
+--- a/light_ws2812_ARM/light_ws2812_cortex.h
++++ b/light_ws2812_ARM/light_ws2812_cortex.h
+@@ -22,6 +22,9 @@
+ #elif defined(LIGHT_WS2812_UC_STM32L0XX)
+   #include "stm32l0xx_hal.h"
+   #define LIGHT_WS2812_STM32
++#elif defined(LIGHT_WS2812_UC_STM32G0XX)
++  #include "stm32g0xx.h"
++  #define LIGHT_WS2812_STM32
+ #elif defined(LIGHT_WS2812_UC_FSL)
+   #include "fsl_port.h"
+   #include "fsl_gpio.h"
+@@ -57,11 +60,16 @@
+ #endif
+ #ifdef LIGHT_WS2812_STM32
+   // This example is for STM32 family
++#if defined(LIGHT_WS2812_UC_STM32L0XX)
+   #define ws2812_port_set ((uint32_t*)&LIGHT_WS2812_GPIO_PORT->BSRR)  // Address of the data port register to set the pin
+   #define ws2812_port_clr ((uint32_t*)&LIGHT_WS2812_GPIO_PORT->BRR) // Address of the data port register to clear the pin
++#elif defined(LIGHT_WS2812_UC_STM32G0XX)
++  #define ws2812_port_set ((uint32_t*)&LIGHT_WS2812_GPIO_PORT->BSRR)  // Address of the data port register to set the pin
++  #define ws2812_port_clr ((uint32_t*)&LIGHT_WS2812_GPIO_PORT->BSRR) // Address of the data port register to clear the pin
++#endif
+
+-  #define ws2812_mask_set  LIGHT_WS2812_GPIO_PIN   // Bitmask to set the data out pin
+-  #define ws2812_mask_clr  LIGHT_WS2812_GPIO_PIN   // Bitmask to clear the data out pin
++  #define ws2812_mask_set  1 << LIGHT_WS2812_GPIO_PIN   // Bitmask to set the data out pin
++  #define ws2812_mask_clr  1 << (LIGHT_WS2812_GPIO_PIN+16)   // Bitmask to clear the data out pin
+ #endif
+ #ifdef LIGHT_WS2812_FSL
+   // This example is for Freescale family
+@@ -102,6 +110,8 @@
+ // predictable code execution timing.
+ ///////////////////////////////////////////////////////////////////////
+
++#include "clk.h"
++#define F_CPU CLOCK_CORECLOCK
+ #ifndef F_CPU
+ 	#error "Error: F_CPU (CPU clock speed) is not defined"
+ #endif
+-- 
+2.25.1
+