URL
https://opencores.org/ocsvn/neorv32/neorv32/trunk
Subversion Repositories neorv32
[/] [neorv32/] [trunk/] [sw/] [example/] [demo_neopixel/] [main.c] - Rev 68
Go to most recent revision | Compare with Previous | Blame | View Log
// ################################################################################################# // # << NEORV32 - Smart LED (NeoPixel/WS2812) Hardware Interface (NEOLED) Demo Program >> # // # ********************************************************************************************* # // # BSD 3-Clause License # // # # // # Copyright (c) 2021, Stephan Nolting. All rights reserved. # // # # // # Redistribution and use in source and binary forms, with or without modification, are # // # permitted provided that the following conditions are met: # // # # // # 1. Redistributions of source code must retain the above copyright notice, this list of # // # conditions and the following disclaimer. # // # # // # 2. Redistributions in binary form must reproduce the above copyright notice, this list of # // # conditions and the following disclaimer in the documentation and/or other materials # // # provided with the distribution. # // # # // # 3. Neither the name of the copyright holder nor the names of its contributors may be used to # // # endorse or promote products derived from this software without specific prior written # // # permission. # // # # // # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS # // # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF # // # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE # // # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, # // # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE # // # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED # // # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING # // # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED # // # OF THE POSSIBILITY OF SUCH DAMAGE. # // # ********************************************************************************************* # // # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting # // ################################################################################################# /**********************************************************************//** * @file demo_neopixel/main.c * @author Stephan Nolting * @brief NeoPixel (WS2812) interface demo using the processor's smart LED interface (NEOLED). **************************************************************************/ #include <neorv32.h> /**********************************************************************//** * @name User configuration **************************************************************************/ /**@{*/ /** UART BAUD rate */ #define BAUD_RATE 19200 /** Number of RGB LEDs in stripe (24-bit data) */ #define NUM_LEDS_24BIT (12) /** Max intensity (0..255) */ #define MAX_INTENSITY (16) /**@}*/ // prototypes uint32_t hsv2rgb(int h, int v); /**********************************************************************//** * Main function * This demo uses a 12-LED RGB ring * * @note This program requires the NEOLED controller to be synthesized (UART0 is optional). * * @return 0 if execution was successful **************************************************************************/ int main() { // capture all exceptions and give debug info via UART0 // this is not required, but keeps us safe neorv32_rte_setup(); // setup UART0 at default baud rate, no parity bits, no hw flow control neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE); // check if NEOLED unit is implemented at all, abort if not if (neorv32_neoled_available() == 0) { neorv32_uart0_printf("Error! No NEOLED unit synthesized!\n"); return 1; } // illustrate setup neorv32_uart0_printf("<<< NEORV32 NeoPixel (WS2812) hardware interface (NEOLED) demo >>>\n" "(TM) 'NeoPixel' is a trademark of Adafruit Industries.\n\n" "This demo uses the following LED setup:\n" "NEORV32.neoled_o -> %u RGB-LEDs (24-bit)\n\n", (uint32_t)NUM_LEDS_24BIT); // use the "neorv32_neoled_setup_ws2812()" setup function here instead the raw "neorv32_neoled_setup()" // neorv32_neoled_setup_ws2812() will configure all timing parameters according to the WS2812 specs. for the current processor clock speed neorv32_neoled_setup_ws2812(); neorv32_neoled_enable(); // enable module neorv32_neoled_set_mode(0); // mode = 0 = 24-bit // check NEOLED configuration neorv32_uart0_printf("Checking NEOLED configuration:\n" " Hardware FIFO size: %u entries\n" " Control register: 0x%x\n\n", neorv32_neoled_get_buffer_size(), NEORV32_NEOLED.CTRL); // clear all LEDs neorv32_uart0_printf("Clearing all LEDs...\n"); int i; for (i=0; i<NUM_LEDS_24BIT; i++) { neorv32_neoled_write_blocking(0); } neorv32_cpu_delay_ms(500); // a simple animation example: rotating rainbow // this example uses BLOCKING NEOLED functions that check the FIFO flags before writing new data // non-blocking functions should only be used when checking the FIFO flags (half-full) in advance (for example using the NEOLED interrupt) neorv32_uart0_printf("Starting animation...\n"); int angle = 0, led_id = 0; while (1) { for (led_id=0; led_id<NUM_LEDS_24BIT; led_id++) { // give every LED a different color neorv32_neoled_write_blocking(hsv2rgb(angle + (360/NUM_LEDS_24BIT) * led_id, MAX_INTENSITY)); } angle += 1; // rotation increment per frame neorv32_neoled_strobe_blocking(); // send strobe ("RESET") command neorv32_cpu_delay_ms(10); // delay between frames } return 0; } /**********************************************************************//** * Convert HSV color to RGB. * * @note Very simple version: using integer arithmetic and ignoring saturation (saturation is always MAX). * * @param[in] h Hue (color angle), 0..359 * @param[in] v Value (intensity), 0..255 * @return LSB-aligned 24-bit RGB data [G,R,B] **************************************************************************/ uint32_t hsv2rgb(int h, int v) { h = h % 360; int r, g, b; int i = h / 60; int difs = h % 60; int rgb_adj = (v * difs) / 60; switch (i) { case 0: r = v; g = 0 + rgb_adj; b = 0; break; case 1: r = v - rgb_adj; g = v; b = 0; break; case 2: r = 0; g = v; b = 0 + rgb_adj; break; case 3: r = 0; g = v - rgb_adj; b = v; break; case 4: r = 0 + rgb_adj; g = 0; b = v; break; default: r = v; g = 0; b = v - rgb_adj; break; } uint32_t res = 0; res |= (((uint32_t)g) & 0xff) << 16; res |= (((uint32_t)r) & 0xff) << 8; res |= (((uint32_t)b) & 0xff) << 0; return res; }
Go to most recent revision | Compare with Previous | Blame | View Log