STM32 sACN接收多个4个universe的标准库程序代码

以下是一个使用STM32标准库实现接收多个sACN universe（4个）的示例代码：

#include "stm32f1xx_hal.h"

#define CHANNELS_PER_UNIVERSE 512
#define NUM_UNIVERSES 4
#define NUM_CHANNELS (CHANNELS_PER_UNIVERSE * NUM_UNIVERSES)

uint8_t sACN_buffer[NUM_CHANNELS];
UART_HandleTypeDef huart1;
DMA_HandleTypeDef hdma_usart1_rx;

int main(void)
{
  HAL_Init();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_USART1_CLK_ENABLE();
  __HAL_RCC_DMA1_CLK_ENABLE();

  GPIO_InitTypeDef GPIO_InitStruct;
  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  huart1.Instance = USART1;
  huart1.Init.BaudRate = 250000;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  HAL_UART_Init(&huart1);

  hdma_usart1_rx.Instance = DMA1_Channel5;
  hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
  hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
  hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE;
  hdma_usart1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
  hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
  hdma_usart1_rx.Init.Mode = DMA_CIRCULAR;
  hdma_usart1_rx.Init.Priority = DMA_PRIORITY_LOW;
  HAL_DMA_Init(&hdma_usart1_rx);

  __HAL_LINKDMA(&huart1, hdmarx, hdma_usart1_rx);
  HAL_UART_Receive_DMA(&huart1, sACN_buffer, NUM_CHANNELS);
  
  while (1)
  {
    // Wait for DMA transfer to complete
    HAL_Delay(10);
    if (hdma_usart1_rx.State == HAL_DMA_STATE_READY)
    {
      // Process sACN data
      for (int i = 0; i < NUM_UNIVERSES; i++)
      {
        uint16_t universe_offset = i * CHANNELS_PER_UNIVERSE;
        uint8_t sequence_number = sACN_buffer[universe_offset + 12];
        // Do something with the data...
      }
      HAL_UART_Receive_DMA(&huart1, sACN_buffer, NUM_CHANNELS);
    }
  }
}

这段代码与上面的代码基本相同，只是将`NUM_UNIVERSES`变量设置为4，从而处理4个sACN universe的数据。在主循环中，我们仍然等待DMA传输完成后，对接收到的sACN数据进行处理。对于4个universe，我们可以使用偏移量和通道数来确定每个universe的数据在缓冲区中的位置。