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[/] [neorv32/] [trunk/] [sw/] [example/] [demo_neopixel/] [main.c] - Rev 59
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// ################################################################################################# // # << 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 A (24-bit data) */ #define NUM_LEDS_24BIT (12) /** Number of RGBW LEDs in stripe B (32-bit data) */ #define NUM_LEDS_32BIT (8) /**@}*/ /**********************************************************************//** * Main function * This demo uses two NeoPixel stripes: Stripe A is a 12-LED RGB ring (arranged as ring - NOT CONNECTED as ring), stripe B is a 8-LED RGBW stripe * * @note This program requires the NEOLED controller to be synthesized (UART0 is optional). * @note NeoPixel stripe connection: NEORV32.neoled_o -> Stripe A ("NUM_LEDS_24BIT" RGB-LEDs) -> Stripe B ("NUM_LEDS_32BIT" RGBW LEDs) * * @return Irrelevant. **************************************************************************/ int main() { // capture all exceptions and give debug info via UART0 // this is not required, but keeps us safe neorv32_rte_setup(); // init UART0 at default baud rate, no parity bits, no hw flow control neorv32_uart_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE); neorv32_uart0_printf("<<< NEORV32 NeoPixel (WS2812) hardware interface (NEOLED) demo >>>\n"); neorv32_uart0_printf("(c) 'NeoPixel' is a trademark of Adafruit Industries.\n"); // check if NEOLED unit is implemented at all, abort if not if (neorv32_neoled_available() == 0) { neorv32_uart_printf("Error! No NEOLED unit synthesized!\n"); return 0; } // clearify setup neorv32_uart0_printf("\nThis demo uses the following LED setup:\n"); neorv32_uart0_printf("NEORV32.neoled_o -> %u RGB-LEDs (24-bit) -> %u RGBW-LEDs (32-bit)\n\n", (uint32_t)NUM_LEDS_24BIT, (uint32_t)NUM_LEDS_32BIT); // use the "neorv32_neoled_setup_ws2812()" setup function here instead the raw "neorv32_neoled_setup_raw()" // neorv32_neoled_setup_ws2812() will configure all timing parameters according to the WS2812 specs. for the current processor clock speed neorv32_neoled_setup_ws2812(0); // use bscon = 0 (busy_flag clears / IRQ fires if at least one buffer entry is free) // check NEOLED configuration neorv32_uart0_printf("Checking NEOLED configuration:\n", neorv32_neoled_get_buffer_size()); neorv32_uart0_printf(" Hardware buffer size: %u entries\n", neorv32_neoled_get_buffer_size()); neorv32_uart0_printf(" Control register: 0x%x\n\n", NEOLED_CT); // clear all LEDs neorv32_uart0_printf("Clearing all LEDs...\n"); int i; for (i=0; i<(NUM_LEDS_24BIT+NUM_LEDS_32BIT); i++) { // just send a lot of zeros neorv32_neoled_send_polling(1, 0); // mode = 1 = 32-bit, -> send 32 zero bits in each iteration } neorv32_cpu_delay_ms(1000); // a simple (but fancy!) animation example neorv32_uart0_printf("Starting animation...\n"); int stripe_pos_rgb = 0, flash_position = 0, flash_direction = -1; int stripe_pos_rgbw = 0, circle_position = 0; uint32_t circle_color = 0x00000004; while (1) { // RGB LEDs: turning circle, changes color after each completed cycle for (stripe_pos_rgb=0; stripe_pos_rgb<NUM_LEDS_24BIT; stripe_pos_rgb++) { if (stripe_pos_rgb == circle_position) { neorv32_neoled_send_polling(0, circle_color); } else { neorv32_neoled_send_polling(0, 0); // LED off } } if (circle_position == (NUM_LEDS_24BIT-1)) { circle_position = 0; circle_color = (circle_color << 8) | ((circle_color >> 16) & 0xff); } else { circle_position++; } // RGBW LEDs: knight rider! if ((flash_position == (NUM_LEDS_32BIT-1)) || (flash_position == 0)) { flash_direction = -flash_direction; } for (stripe_pos_rgbw=0; stripe_pos_rgbw<NUM_LEDS_32BIT; stripe_pos_rgbw++) { if (stripe_pos_rgbw == flash_position) { neorv32_neoled_send_polling(1, 0x00000004); // white dot using the dedicated white LED chip } else { neorv32_neoled_send_polling(1, 0); // LED off } } flash_position += flash_direction; // delay between frames; also used to "send" ws2812.reset command neorv32_cpu_delay_ms(100); } return 0; }
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