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// #################################################################################################

// # << NEORV32 - Smart LED (NeoPixel/WS2812) Hardware Interface (NEOLED) Demo Program >>          #

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// # BSD 3-Clause License                                                                          #

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// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #

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// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #

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/**********************************************************************//**

 * @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;

}