USBHostGPS.h

00001 // Simple USBHost GPS Dongle for FRDM-KL46Z
00002 #include "USBHost.h"
00003 
00004 #define PL2303_SET_LINE_CODING 0x20
00005 
00006 class USBHostGPS : public IUSBEnumerator {
00007 public:
00008 
00009     /**
00010     * Constructor
00011     */
00012     USBHostGPS(int baud = 38400);
00013 
00014     /**
00015      * Try to connect a USB GPS device
00016      *
00017      * @return true if connection was successful
00018      */
00019     bool connect();
00020 
00021     /**
00022     * Check if a USB GPS is connected
00023     *
00024     * @returns true if a mouse is connected
00025     */
00026     bool connected();
00027 
00028     int readNMEA(char* data, int size, int timeout_ms) {
00029         int result = host->BulkRead(bulk_in, (uint8_t*)data, size, timeout_ms);
00030         return (result >= 0) ? bulk_in->getLengthTransferred() : 0;
00031     }
00032     void attachEvent(void (*ptr)(uint8_t* data, int size)) {
00033         if (ptr != NULL) {
00034             onUpdate = ptr;
00035         }
00036     }
00037     void poll() {
00038         int result = host->BulkRead(bulk_in, buf, sizeof(buf), 0);
00039         if (result >= 0) {
00040             if (onUpdate) {
00041                 (*onUpdate)(buf, bulk_in->getLengthTransferred());
00042             }
00043         }
00044     }
00045 
00046 protected:
00047     //From IUSBEnumerator
00048     virtual void setVidPid(uint16_t vid, uint16_t pid);
00049     virtual bool parseInterface(uint8_t intf_nb, uint8_t intf_class, uint8_t intf_subclass, uint8_t intf_protocol); //Must return true if the interface should be parsed
00050     virtual bool useEndpoint(uint8_t intf_nb, ENDPOINT_TYPE type, ENDPOINT_DIRECTION dir); //Must return true if the endpoint will be used
00051 
00052 private:
00053     USBHost * host;
00054     USBDeviceConnected* dev;
00055     USBEndpoint* bulk_in;
00056     bool dev_connected;
00057     bool gps_device_found;
00058     int gps_intf;
00059     void (*onUpdate)(uint8_t* data, int size);
00060     uint8_t buf[64];
00061     int baud;
00062     void init();
00063 };