Add missing DMA header file. (#245)

Author: lihuanhuan

core/embed/trezorhal/dma_channel.h

@@ -0,0 +1,32 @@
+#ifndef _DMA_CHANNEL_H_
+#define _DMA_CHANNEL_H_
+
+// ST BLE UART4 DMA
+#define UARTx_RX_DMA_STREAM DMA1_Stream0
+#define UARTx_TX_DMA_STREAM DMA1_Stream1
+
+#define UARTx_RX_DMA_REQUEST DMA_REQUEST_UART4_RX
+#define UARTx_TX_DMA_REQUEST DMA_REQUEST_UART4_TX
+
+#define UARTx_DMA_RX_IRQn DMA1_Stream0_IRQn
+#define UARTx_DMA_RX_IRQHandler DMA1_Stream0_IRQHandler
+
+#define UARTx_DMA_TX_IRQn DMA1_Stream1_IRQn
+#define UARTx_DMA_TX_IRQHandler DMA1_Stream1_IRQHandler
+
+// ST BLE SPI2 DMA
+/* Definition for SPIx's DMA */
+#define SPIx_TX_DMA_STREAM DMA1_Stream3
+#define SPIx_RX_DMA_STREAM DMA1_Stream2
+
+#define SPIx_TX_DMA_REQUEST DMA_REQUEST_SPI2_TX
+#define SPIx_RX_DMA_REQUEST DMA_REQUEST_SPI2_RX
+
+/* Definition for SPIx's NVIC */
+#define SPIx_DMA_TX_IRQn DMA1_Stream3_IRQn
+#define SPIx_DMA_RX_IRQn DMA1_Stream2_IRQn
+
+#define SPIx_DMA_TX_IRQHandler DMA1_Stream3_IRQHandler
+#define SPIx_DMA_RX_IRQHandler DMA1_Stream2_IRQHandler
+
+#endif