Magic Hercules - driver for digital LEDs

#include <avr/io.h>
#include <util/delay.h>
#include <string.h>

#include "MK_HERCULES_SPI/mk_hercules_spi.h"

typedef struct {
	uint8_t g;
	uint8_t r;
	uint8_t b;
} TRGB;

TRGB mbuf[24];

int ir=0, ig=8, ib=16;

void draw_stargate( void ) {

	mbuf[ir].r = 5;
	mbuf[ig].g = 5;
	mbuf[ib].r = 5; mbuf[ib].g = 3;

	if( ++ir == 24 ) ir = 0;
	if( --ig < 0 ) ig = 23;
	if( ++ib == 24 ) ib = 0;

	mbuf[3].b = 10;
	mbuf[9].b = 10;
	mbuf[15].b = 10;
	mbuf[21].b = 10;

	hspi_send_buf( mbuf, 24*3 );
	memset( mbuf, 0, 24*3 );
}


int main( void ) {

	hspi_init();

	while(1) {

		draw_stargate();
		_delay_ms(50);

	}
}

#include <SPI.h>

typedef struct {
  uint8_t g;
  uint8_t r;
  uint8_t b;
} TRGB ;

TRGB mbuf[24];

int ir=0, ig=8, ib=16;

void setup() {
  SPI.begin();
  SPI.setClockDivider( SPI_CLOCK_DIV32 );
}

void draw_stargate() {

  memset( mbuf, 0, sizeof(mbuf) );
  
  mbuf[ir].r = 5;
  mbuf[ig].g = 5;
  mbuf[ib].r = 5; mbuf[ib].g = 3;

  if( ++ir == 24 ) ir = 0;
  if( --ig < 0 ) ig = 23;
  if( ++ib == 24 ) ib = 0;

  mbuf[3].b = 10;
  mbuf[9].b = 10;
  mbuf[15].b = 10;
  mbuf[21].b = 10;

  cli();
  SPI.transfer( mbuf, sizeof(mbuf) );
  sei();
}

void loop() {
  draw_stargate();
  delay(50);
}

/* USER CODE BEGIN Header */
/**
  **************************
  * @file           : main.c
  * @brief          : Main program body
  **************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  **************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <string.h>

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi1;
DMA_HandleTypeDef hdma_spi1_tx;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */


// new TRGB type
typedef struct {
	uint8_t g;
	uint8_t r;
	uint8_t b;
} TRGB;

// Magic LED RING - 24 LEDs
TRGB mbuf[24];	// FX buffer


// LED start indexes
int ir=0, ig=8, ib=16;


void draw_stargate( void ) {

	// clear FX buffer
	memset( mbuf, 0, 24*3 );

	// moving lights
	mbuf[ir].r = 5;
	mbuf[ig].g = 5;
	mbuf[ib].r = 5; mbuf[ib].g = 3;

	// change moving lights position
	if( ++ir == 24 ) ir = 0;
	if( --ig < 0 ) ig = 23;
	if( ++ib == 24 ) ib = 0;

	// 4 blue light
	mbuf[3].b = 10;
	mbuf[9].b = 10;
	mbuf[15].b = 10;
	mbuf[21].b = 10;

	// send FX buffer via SPI to Magic HERCULES
	HAL_SPI_Transmit_DMA(&hspi1, (uint8_t*)mbuf, 72 );
}



/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART2_UART_Init();
  MX_SPI1_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
	  draw_stargate();
	  HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
	  HAL_Delay(50);

  }
  /* USER CODE END 3 */
}