text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include <stdint.h>
  #include <stm32f1xx_hal_dma.h>
  
  struct stm32_dma_cfg {
      uint8_t dma_ch;
      uint8_t irqn;
      void (*irq_handler)(void);
      DMA_Channel_TypeDef *regs;
      DMA_InitTypeDef init;
  };
  
  #define SPI_DMA_CHANNEL(dma, ch, name) \
      extern const struct stm32_dma_cfg DMA ## dma ## _channel ## ch
  
  SPI_DMA_CHANNEL(1, 2, spi1_rx);
  SPI_DMA_CHANNEL(1, 3, spi1_tx);
  
  SPI_DMA_CHANNEL(1, 4, spi2_rx);
  SPI_DMA_CHANNEL(1, 5, spi2_tx);
  
  SPI_DMA_CHANNEL(2, 1, spi3_rx);
  SPI_DMA_CHANNEL(2, 2, spi3_tx);
  