miniCanIO

Small CAN device based on STM32F1xx. Switch anything based on any CAN-messages.

project is in an early development state. contribute, read, test, or come later.

features

• Configurable via CAN
• config write potection
• config message can id can be changed
• supports 125kb/s, 250kb/s and 500kb/s
• until now: 16kB flash memory is enough

config

default settings

• CAN Speed 500kb/s
• listening on config CAN-ID 0xBB
• sending return value at CAN-ID 0xB9
• acknowledge CAN-Messages
• config key is: 16x 0x00

read settings

sample msg: 0BB: CF <block number>
returns: 0B9: CF <block number> <6 bytes of data>
returns 6 bytes of config data starting at offset 6*<block number>

change settings

1. unlock
   sample msg: 0BB: C0 <key bytes 0..5> sample msg: 0BB: C0 <key bytes 6..11>
   sample msg: 0BB: C0 <key bytes 12..15>
2. edit config (position, length, up to 4 data bytes)
   change can-rx-id to 0x00CA
   sample msg: BB CE 1C 02 CA 00
3. write changes to flash BB C9
4. lock BB C0

config structs

typedef struct _Scanconfig{
    uint32_t valid;
    uint8_t key[16];    // default 0x00 0x00 0x00...
    uint16_t version;   // pos20 = 0x14
    uint16_t canSpeed;  // pos 22 = 0x16
    uint32_t configMsgIdRx;		// pos 24
    uint32_t configMsgIdTx;     // pos 28
    uint32_t pinResetState; // pos 32 = 0x20
    // pos 36 = 0x24
    uint32_t ack:1;
    uint32_t noRetransmission:1;
    uint32_t wakeup:1;  //for future use
    uint32_t extendedIds:1;
    uint32_t filtersAreList:1;
    uint32_t res:27;
    // pos40 = 0x26
    Scancfgmsg msgCfg[9];  
} Scanconfig, *Pcanconfig;

typedef struct _Scancfgmsg{
  uint32_t msg_id:29;
  uint32_t reserved:1;
  uint32_t msg_id_is_ext:1;
  uint8_t bytePos;
  uint8_t bitMask;
  uint8_t verifyType;
  uint8_t verifyValue;
  uint8_t switchType;
  uint8_t outputPin;
}Scancfgmsg, *Pcancfgmsg; //size: 3*4 +6 = 22

Details see: src/config.h

python script for reading and editing config data

configapp/canIoConfig.py

DBC file for CAN config messages

dbc/canIO.dbc