1 files changed, 82 insertions, 0 deletions
diff --git a/controller/fw/src/serial.h b/controller/fw/src/serial.h
new file mode 100644
index 0000000..02f6f5d
--- /dev/null
+++ b/controller/fw/src/serial.h
@@ -0,0 +1,82 @@
+/*
+ * This file is part of the libusbhost library
+ * hosted at http://github.com/libusbhost/libusbhost
+ *
+ * Copyright (C) 2015 Amir Hammad <amir.hammad@hotmail.com>
+ *
+ *
+ * libusbhost is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef __SERIAL_H__
+#define __SERIAL_H__
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include "sr_global.h"
+
+struct dma_tx_buf {
+    /* The following fields are accessed only from DMA ISR */
+    ssize_t xfr_start; /* Start index of running DMA transfer */
+    ssize_t xfr_end; /* End index of running DMA transfer plus one */
+    bool wraparound;
+    ssize_t xfr_next;
+
+    /* The following fields are written only from non-interrupt code */
+    ssize_t wr_pos; /* Next index to be written */
+    ssize_t wr_idx;
+    ssize_t chunk_end[8];
+
+/* Make GCC shut up about the zero-size array member. */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+    /* Written outside ISR by usart_send_chunk_nonblocking, read via DMA */
+    uint8_t data[0];
+#pragma GCC diagnostic pop
+};
+
+struct usart_desc {
+    struct dma_tx_buf tx_buf;
+    uint8_t data[512];
+
+    uint32_t tx_chunk_overruns, tx_byte_overruns;
+    uint32_t tx_errors;
+
+    volatile uint8_t rx_buf[32];
+
+    int comm_led;
+
+    USART_TypeDef *le_usart;
+    int le_usart_irqn;
+    DMA_Stream_TypeDef *tx_dmas;
+    int tx_dma_sn;
+    int tx_dma_ch;
+    DMA_TypeDef *tx_dma;
+    int tx_dma_irqn;
+};
+
+void usart_dma_init(volatile struct usart_desc *us, unsigned int baudrate);
+int usart_send_chunk_nonblocking(volatile struct usart_desc *us, const char *chunk, size_t chunk_len);
+int usart_putc_nonblocking(volatile struct usart_desc *us, char c);
+
+void usart_dma_stream_irq(volatile struct usart_desc *us);
+int usart_flush(volatile struct usart_desc *us);
+int usart_printf(volatile struct usart_desc *us, char *fmt, ...);
+
+#endif // __SERIAL_H__