1 files changed, 75 insertions, 0 deletions
diff --git a/hardware/fw/serial.h b/hardware/fw/serial.h
new file mode 100644
index 0000000..8cec089
--- /dev/null
+++ b/hardware/fw/serial.h
@@ -0,0 +1,75 @@
+/*
+ * 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 <stdarg.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include "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;
+    bool ack;
+
+
+    /* 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 packet_end[8];
+
+    /* The following may be accessed by anything */
+    uint8_t data[512];
+};
+
+struct __attribute__((__packed__)) ll_pkt {
+    uint32_t crc32;
+    /* CRC computed over entire packet starting here */
+    uint8_t pid;
+    uint8_t _pad;
+    uint8_t data[];
+};
+
+enum ctrl_pkt_type {
+    CTRL_PKT_RESET = 1,
+    CTRL_PKT_ACK = 2,
+};
+
+struct __attribute__((__packed__)) ctrl_pkt {
+    uint8_t type;
+    uint8_t orig_id;
+};
+
+extern volatile struct dma_tx_buf usart_tx_buf;
+
+void usart_dma_init(void);
+int usart_send_packet_nonblocking(struct ll_pkt *pkt, size_t pkt_len);
+int usart_ack_packet(uint8_t idx);
+
+#endif // __SERIAL_H__