Diff: packet_parser.h

Revision:

0:8cfa73bb68e4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/packet_parser.h	Tue May 31 17:04:59 2016 +0000
@@ -0,0 +1,90 @@
+#ifndef PACKET_PARSER_H
+#define PACKET_PARSER_H
+
+#include "mbed.h"
+
+#include "MODDMA.h"
+#include "MODSERIAL.h"
+#include "rtos.h"
+#include "lib_crc.h"
+
+#include "protocol.h"
+
+/**
+ * Defines the number of packets in the incoming and outgoing buffers.
+ */
+#define PACKET_BUFFER_LENGTH 4
+
+/**
+ * Thread flag to start work.
+ */
+#define START_THREAD_FLAG (1<<0)
+#define DMA_COMPLETE_FLAG (1<<1)
+
+class PacketParser {
+  
+  public:
+
+    /**
+     * Constructor.
+     *
+     * Creates a packet parsing protocol on the USB serial connection.
+     *
+     */
+    PacketParser(uint32_t baudrate, PinName tx_pin, PinName rx_pin, PinName tx_led, PinName rx_led);
+
+    /**
+     * Get a pointer to the next received packet, or NULL if there is no packet.
+     */
+    packet_union_t* get_received_packet(void);
+
+    /**
+     * Return a received packet to the packet pool. Must be called after using
+     * a packet from get_received_packet.
+     *
+     * @param packet - pointer to packet to be freed.
+     */
+    void free_received_packet(packet_union_t* packet);
+
+    /**
+     * Get a pointer to a packet to be sent. Will return NULL if there are no
+     * available outgoing packets.
+     */
+    packet_union_t* get_send_packet(void);
+
+    /**
+     * Send the packet returned by get_send_packet.
+     *
+     * @param packet - pointer to packet to be sent.
+     */
+    void send_packet(packet_union_t* packet);
+
+  private:
+
+    MODSERIAL pc_;
+    MODDMA dma_;
+    
+    DigitalOut tx_led_;
+    uint32_t tx_sequence_;
+
+    Mail<packet_union_t, PACKET_BUFFER_LENGTH> out_box_;
+    packet_union_t* out_pkt_;
+    
+    static void thread_starter(void const *p);
+    Thread send_thread_;
+    
+    void send_worker(void);
+    void send_complete(MODSERIAL_IRQ_INFO *q);
+
+    DigitalOut rx_led_;
+    Mail<packet_union_t, PACKET_BUFFER_LENGTH> in_box_;
+    
+    packet_union_t* in_pkt_;
+    uint32_t in_pkt_idx_;
+    uint32_t in_pkt_len_;
+    uint8_t in_pkt_crc_;
+
+    void receive_callback(MODSERIAL_IRQ_INFO *q);
+};
+
+#endif
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