Nathan Ewin
A project similar to http://mbed.org/users/lhiggs/code/UM6_IMU_AHRS_2012/, where I'm trying to log data from a UM6 (CH Robotics orientation sensor) and a GPS transceiver to an sd card. I've adapted LHiggs code to include ModGPS. For sum reason a soon as I pick up a gps signal the UM6 data freezes i.e. the time and gps signals continue to print out but the UM6 signals fixes on a single value.
Dependencies: MODGPS MODSERIAL SDFileSystem mbed
Diff: UM6_usart/UM6_usart.h
- Revision:
- 4:8dcf0bdc25c8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/UM6_usart/UM6_usart.h Fri May 24 12:47:22 2013 +0000
@@ -0,0 +1,60 @@
+/* ______________________________________________________________________________________
+ File: UM6_usart.h
+ Author: CH Robotics, adapted for mbed by lhiggs
+ Version: 1.0
+
+ Description: Function declarations for USART communucation
+ -------------------------------------------------------------------------------------- */
+
+ #ifndef _CHR_USART_H
+ #define _CHR_USART_H
+
+ #define MAX_PACKET_DATA 40
+
+ // Definitions of states for USART receiver state machine (for receiving packets)
+ #define USART_STATE_WAIT 1
+ #define USART_STATE_TYPE 2
+ #define USART_STATE_ADDRESS 3
+ #define USART_STATE_DATA 4
+ #define USART_STATE_CHECKSUM 5
+
+ // Flags for interpreting the packet type byte in communication packets
+ #define PACKET_HAS_DATA (1 << 7)
+ #define PACKET_IS_BATCH (1 << 6)
+ #define PACKET_BATCH_LENGTH_MASK ( 0x0F )
+
+ #define PACKET_BATCH_LENGTH_OFFSET 2
+
+ #define BATCH_SIZE_2 2
+ #define BATCH_SIZE_3 3
+
+ #define PACKET_NO_DATA 0
+ #define PACKET_COMMAND_FAILED (1 << 0)
+
+
+ // Define flags for identifying the type of packet address received
+ #define ADDRESS_TYPE_CONFIG 0
+ #define ADDRESS_TYPE_DATA 1
+ #define ADDRESS_TYPE_COMMAND 2
+
+
+extern uint8_t gUSART_State;
+
+ // Structure for storing TX and RX packet data
+ typedef struct _USARTPacket
+ {
+ uint8_t PT; // Packet type
+ uint8_t address; // Packet address
+ uint16_t checksum; // Checksum
+
+ // Data included for convenience, but that isn't stored in the packet itself
+ uint8_t data_length; // Number of bytes in data section
+ uint8_t address_type; // Specified the address type (DATA, CONFIG, OR COMMAND)
+
+ uint8_t packet_data[MAX_PACKET_DATA];
+
+ } USARTPacket;
+
+uint16_t ComputeChecksum( USARTPacket* new_packet );
+
+#endif
\ No newline at end of file