Open OBC
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e36obd
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DS2.h@0:32d3cc3791c4, 2011-05-20 (annotated)
- Committer:
- openobc
- Date:
- Fri May 20 16:54:39 2011 +0000
- Revision:
- 0:32d3cc3791c4
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| openobc | 0:32d3cc3791c4 | 1 | #ifndef DS2_H |
| openobc | 0:32d3cc3791c4 | 2 | #define DS2_H |
| openobc | 0:32d3cc3791c4 | 3 | |
| openobc | 0:32d3cc3791c4 | 4 | #include "mbed.h" |
| openobc | 0:32d3cc3791c4 | 5 | |
| openobc | 0:32d3cc3791c4 | 6 | #include "Bus.h" |
| openobc | 0:32d3cc3791c4 | 7 | |
| openobc | 0:32d3cc3791c4 | 8 | extern Serial dbg; |
| openobc | 0:32d3cc3791c4 | 9 | |
| openobc | 0:32d3cc3791c4 | 10 | #define DS2_MTU (127) |
| openobc | 0:32d3cc3791c4 | 11 | |
| openobc | 0:32d3cc3791c4 | 12 | static const char DS2_IDENTIFY[] = {0x00}; |
| openobc | 0:32d3cc3791c4 | 13 | |
| openobc | 0:32d3cc3791c4 | 14 | /* |
| openobc | 0:32d3cc3791c4 | 15 | a ds2 packet looks like this: |
| openobc | 0:32d3cc3791c4 | 16 | {0xAA, 0xAA, 0xLL, 0xDD, 0xCC} |
| openobc | 0:32d3cc3791c4 | 17 | or this: |
| openobc | 0:32d3cc3791c4 | 18 | {0xAA, 0xLL, 0xDD, 0xCC} |
| openobc | 0:32d3cc3791c4 | 19 | AA = module address |
| openobc | 0:32d3cc3791c4 | 20 | LL = packet length |
| openobc | 0:32d3cc3791c4 | 21 | DD = data |
| openobc | 0:32d3cc3791c4 | 22 | CC = checksum |
| openobc | 0:32d3cc3791c4 | 23 | there can be either one or two AA module address bytes |
| openobc | 0:32d3cc3791c4 | 24 | there can be 1 or more DD data bytes |
| openobc | 0:32d3cc3791c4 | 25 | |
| openobc | 0:32d3cc3791c4 | 26 | here is an example query packet: |
| openobc | 0:32d3cc3791c4 | 27 | {0x12, 0x04, 0x00, 0x16} (query DME for identification) |
| openobc | 0:32d3cc3791c4 | 28 | the address is a one-byte address of 0x12 (DME) |
| openobc | 0:32d3cc3791c4 | 29 | the packet length is 0x04 bytes |
| openobc | 0:32d3cc3791c4 | 30 | the one byte data payload is 0x00 (identify module) |
| openobc | 0:32d3cc3791c4 | 31 | the xor checksum of the entire packet is 0x16 |
| openobc | 0:32d3cc3791c4 | 32 | |
| openobc | 0:32d3cc3791c4 | 33 | the reply would look like this: |
| openobc | 0:32d3cc3791c4 | 34 | {0x12, 0x10, ... 0x??} (DME responding...) |
| openobc | 0:32d3cc3791c4 | 35 | the one byte address is 0x12 (DME) |
| openobc | 0:32d3cc3791c4 | 36 | the packet length will be 0x10 bytes |
| openobc | 0:32d3cc3791c4 | 37 | the xor checksum 0x?? would depend on the missing data "..." |
| openobc | 0:32d3cc3791c4 | 38 | |
| openobc | 0:32d3cc3791c4 | 39 | the same query packet would look like this with two address bytes: |
| openobc | 0:32d3cc3791c4 | 40 | {0x12, 0x00, 0x05, 0x00, 0x17} |
| openobc | 0:32d3cc3791c4 | 41 | |
| openobc | 0:32d3cc3791c4 | 42 | it seems that some modules want one address byte and some want two |
| openobc | 0:32d3cc3791c4 | 43 | either that or it's an extra length byte we're dealing with |
| openobc | 0:32d3cc3791c4 | 44 | probably it's a length byte, but I'll worry about it when I find out |
| openobc | 0:32d3cc3791c4 | 45 | */ |
| openobc | 0:32d3cc3791c4 | 46 | class DS2Packet |
| openobc | 0:32d3cc3791c4 | 47 | { |
| openobc | 0:32d3cc3791c4 | 48 | unsigned short* address; |
| openobc | 0:32d3cc3791c4 | 49 | char* length; |
| openobc | 0:32d3cc3791c4 | 50 | char* data; |
| openobc | 0:32d3cc3791c4 | 51 | char* checksum; |
| openobc | 0:32d3cc3791c4 | 52 | |
| openobc | 0:32d3cc3791c4 | 53 | char* rawdata; |
| openobc | 0:32d3cc3791c4 | 54 | bool has8BitAddr; |
| openobc | 0:32d3cc3791c4 | 55 | |
| openobc | 0:32d3cc3791c4 | 56 | void updateChecksum(); |
| openobc | 0:32d3cc3791c4 | 57 | |
| openobc | 0:32d3cc3791c4 | 58 | public: |
| openobc | 0:32d3cc3791c4 | 59 | DS2Packet(int maxlength); |
| openobc | 0:32d3cc3791c4 | 60 | DS2Packet(int address, const char* data, int length); |
| openobc | 0:32d3cc3791c4 | 61 | ~DS2Packet(); |
| openobc | 0:32d3cc3791c4 | 62 | |
| openobc | 0:32d3cc3791c4 | 63 | void has8BitAddress(bool b); |
| openobc | 0:32d3cc3791c4 | 64 | |
| openobc | 0:32d3cc3791c4 | 65 | bool has8BitAddress() |
| openobc | 0:32d3cc3791c4 | 66 | { |
| openobc | 0:32d3cc3791c4 | 67 | return has8BitAddr; |
| openobc | 0:32d3cc3791c4 | 68 | } |
| openobc | 0:32d3cc3791c4 | 69 | |
| openobc | 0:32d3cc3791c4 | 70 | int getAddress() |
| openobc | 0:32d3cc3791c4 | 71 | { |
| openobc | 0:32d3cc3791c4 | 72 | if(has8BitAddr) |
| openobc | 0:32d3cc3791c4 | 73 | return *address >> 8 & 0xff; |
| openobc | 0:32d3cc3791c4 | 74 | return *address; |
| openobc | 0:32d3cc3791c4 | 75 | } |
| openobc | 0:32d3cc3791c4 | 76 | |
| openobc | 0:32d3cc3791c4 | 77 | int getLength() |
| openobc | 0:32d3cc3791c4 | 78 | { |
| openobc | 0:32d3cc3791c4 | 79 | return *length; |
| openobc | 0:32d3cc3791c4 | 80 | } |
| openobc | 0:32d3cc3791c4 | 81 | |
| openobc | 0:32d3cc3791c4 | 82 | char* getData() |
| openobc | 0:32d3cc3791c4 | 83 | { |
| openobc | 0:32d3cc3791c4 | 84 | return data; |
| openobc | 0:32d3cc3791c4 | 85 | } |
| openobc | 0:32d3cc3791c4 | 86 | |
| openobc | 0:32d3cc3791c4 | 87 | int getChecksum() |
| openobc | 0:32d3cc3791c4 | 88 | { |
| openobc | 0:32d3cc3791c4 | 89 | char* check = rawdata + *length - 1; |
| openobc | 0:32d3cc3791c4 | 90 | return *check; |
| openobc | 0:32d3cc3791c4 | 91 | } |
| openobc | 0:32d3cc3791c4 | 92 | |
| openobc | 0:32d3cc3791c4 | 93 | char* getRawData() |
| openobc | 0:32d3cc3791c4 | 94 | { |
| openobc | 0:32d3cc3791c4 | 95 | return rawdata; |
| openobc | 0:32d3cc3791c4 | 96 | } |
| openobc | 0:32d3cc3791c4 | 97 | }; |
| openobc | 0:32d3cc3791c4 | 98 | |
| openobc | 0:32d3cc3791c4 | 99 | class DS2 |
| openobc | 0:32d3cc3791c4 | 100 | { |
| openobc | 0:32d3cc3791c4 | 101 | Bus *k; |
| openobc | 0:32d3cc3791c4 | 102 | Bus *l; |
| openobc | 0:32d3cc3791c4 | 103 | |
| openobc | 0:32d3cc3791c4 | 104 | public: |
| openobc | 0:32d3cc3791c4 | 105 | DS2(Bus* KLine, Bus* LLine); |
| openobc | 0:32d3cc3791c4 | 106 | ~DS2(); |
| openobc | 0:32d3cc3791c4 | 107 | int sendPacket(DS2Packet* packet, Bus* bus); |
| openobc | 0:32d3cc3791c4 | 108 | DS2Packet* getPacket(Bus* bus); |
| openobc | 0:32d3cc3791c4 | 109 | DS2Packet* getPacket8(Bus* bus); |
| openobc | 0:32d3cc3791c4 | 110 | bool test(); |
| openobc | 0:32d3cc3791c4 | 111 | void testModule(int address); |
| openobc | 0:32d3cc3791c4 | 112 | void snoop(); |
| openobc | 0:32d3cc3791c4 | 113 | |
| openobc | 0:32d3cc3791c4 | 114 | }; |
| openobc | 0:32d3cc3791c4 | 115 | |
| openobc | 0:32d3cc3791c4 | 116 | #endif //DS2_H |