stm32: add option to handle tty using DMA

multi/stm32l4-multi/config.h

@@ -58,6 +58,86 @@
 
 /* UART_CONSOLE has to be specified in board_config.h */
 
+#ifndef TTY1_DMA
+#define TTY1_DMA 0
+#endif
+
+#ifndef TTY2_DMA
+#define TTY2_DMA 0
+#endif
+
+#ifndef TTY3_DMA
+#define TTY3_DMA 0
+#endif
+
+#ifndef TTY4_DMA
+#define TTY4_DMA 0
+#endif
+
+#ifndef TTY5_DMA
+#define TTY5_DMA 0
+#endif
+
+#ifndef TTY1_DMA_RXSZ
+#define TTY1_DMA_RXSZ 64
+#endif
+
+#ifndef TTY2_DMA_RXSZ
+#define TTY2_DMA_RXSZ 64
+#endif
+
+#ifndef TTY3_DMA_RXSZ
+#define TTY3_DMA_RXSZ 64
+#endif
+
+#ifndef TTY4_DMA_RXSZ
+#define TTY4_DMA_RXSZ 64
+#endif
+
+#ifndef TTY5_DMA_RXSZ
+#define TTY5_DMA_RXSZ 64
+#endif
+
+#ifndef TTY1_DMA_TXSZ
+#define TTY1_DMA_TXSZ 64
+#endif
+
+#ifndef TTY2_DMA_TXSZ
+#define TTY2_DMA_TXSZ 64
+#endif
+
+#ifndef TTY3_DMA_TXSZ
+#define TTY3_DMA_TXSZ 64
+#endif
+
+#ifndef TTY4_DMA_TXSZ
+#define TTY4_DMA_TXSZ 64
+#endif
+
+#ifndef TTY5_DMA_TXSZ
+#define TTY5_DMA_TXSZ 64
+#endif
+
+#ifndef TTY1_LIBTTY_BUFSZ
+#define TTY1_LIBTTY_BUFSZ 512
+#endif
+
+#ifndef TTY2_LIBTTY_BUFSZ
+#define TTY2_LIBTTY_BUFSZ 512
+#endif
+
+#ifndef TTY3_LIBTTY_BUFSZ
+#define TTY3_LIBTTY_BUFSZ 512
+#endif
+
+#ifndef TTY4_LIBTTY_BUFSZ
+#define TTY4_LIBTTY_BUFSZ 512
+#endif
+
+#ifndef TTY5_LIBTTY_BUFSZ
+#define TTY5_LIBTTY_BUFSZ 512
+#endif
+
 
 /* SPI */
 #ifndef SPI1

multi/stm32l4-multi/libmulti/include/libmulti/libdma.h

@@ -13,15 +13,59 @@
 #define LIBDMA_H_
 
 #include <stddef.h>
+#include <stdint.h>
+#include <sys/threads.h>
 
 
+#define DMA_MAX_LEN ((1u << 16) - 1u)
+
+
+/* clang-format off */
 enum { dma_per2mem = 0, dma_mem2per };
 
 
-int libdma_configureSpi(int num, int dir, int priority, void *paddr, int msize, int psize, int minc, int pinc);
+enum { dma_spi = 0, dma_uart };
+
+
+enum { dma_ht = 0, dma_tc };
+/* clang-format on */
+
+
+struct libdma_per;
+
+
+/* If cond == NULL only sync function maybe used, otherwise only async functions. */
+int libdma_configurePeripheral(const struct libdma_per *per, int dir, int priority, void *paddr, int msize, int psize, int minc, int pinc, handle_t *cond);
+
+
+/* SYNC FUNCTIONS */
+
+
+int libdma_transfer(const struct libdma_per *per, void *rx_maddr, const void *tx_maddr, size_t len);
+
+
+/* ASYNC FUNCTIONS */
+
+
+/* Only one tx request per channel may be issued at a time. */
+int libdma_txAsync(const struct libdma_per *per, const void *tx_maddr, size_t len, volatile int *done_flag);
+
+
+/* Only one rx request per channel may be issued at a time. */
+int libdma_rxAsync(const struct libdma_per *per, void *rx_maddr, size_t len, volatile int *done_flag);
+
+
+/* Receive infinite rx into circular buffer. Fn is called at each Transfer Complete and Half Transfer interrupt. */
+int libdma_infiniteRxAsync(const struct libdma_per *per, void *rx_maddr, size_t len, void fn(void *arg, int type), void *arg);
+
+
+/* UTILITY FUNCTIONS */
+
+
+uint16_t libdma_leftToRx(const struct libdma_per *per);
 
 
-int libdma_transferSpi(int num, void *rx_maddr, const void *tx_maddr, size_t len);
+const struct libdma_per *libdma_getPeripheral(int per, unsigned int num);
 
 
 int libdma_init(void);

multi/stm32l4-multi/libmulti/include/libmulti/libspi.h

@@ -18,6 +18,7 @@
 
 #include <stddef.h>
 #include <sys/threads.h>
+#include "libmulti/libdma.h"
 
 
 typedef struct {
@@ -27,21 +28,23 @@ typedef struct {
 	const unsigned char *obuff;
 	size_t cnt;
 
-	int usedma;
+	const struct libdma_per *per;
 } libspi_ctx_t;
 
 
-enum { spi1 = 0, spi2, spi3 };
+#define SPI_ADDRSHIFT 3
+#define SPI_ADDRMASK  0x3
 
 
-#define SPI_ADDRSHIFT 3
-#define SPI_ADDRMASK 0x3
+/* clang-format off */
+enum { spi1 = 0, spi2, spi3 };
 
 
 enum { spi_cmd = 0x1, spi_dummy = 0x2, /* 3-bits for SPI_ADDR* ,*/ spi_addrlsb = 0x20 };
 
 
 enum { spi_dir_read = 0, spi_dir_write, spi_dir_readwrite };
+/* clang-format on */
 
 
 int libspi_transaction(libspi_ctx_t *ctx, int dir, unsigned char cmd, unsigned int addr, unsigned char flags,