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dipic 與 18f CAN BUS 接收錯誤
#1
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連續傳送2個以上的0xFF,接收就會收不到或錯誤。
如果傳送不是連續的0xFF,例如0x00,0xAA,0x55,0xEE就不會有錯誤。
使用30F6010 Oscillator用7.5MHz 16倍頻,對
18F4480 Oscillator用 10MHz 4 倍頻。
不管是30F6010對18F4480傳送,或18F4480對30F6010傳送,都有上訴的問題。
使用示波器看BaudRate為125K
30F6010的設定如下:
CAN1SetOperationMode( CAN_IDLE_STOP &
CAN_MASTERCLOCK_0 &
CAN_REQ_OPERMODE_CONFIG &
CAN_CAPTURE_DIS );
CAN1Initialize( CAN_SYNC_JUMP_WIDTH4 &
CAN_BAUD_PRE_SCALE(20),
CAN_WAKEUP_BY_FILTER_DIS &
CAN_PHASE_SEG2_TQ(8) &
CAN_PHASE_SEG1_TQ(8) &
CAN_PROPAGATIONTIME_SEG_TQ(7) &
CAN_SEG2_FREE_PROG &
CAN_SAMPLE3TIMES ) ;
18F4480的設定如下:
CANInitialize( 4,8,8,6,5, CAN_CONFIG_LINE_FILTER_OFF & CAN_CONFIG_SAMPLE_THRICE &
CAN_CONFIG_VALID_XTD_MSG & CAN_CONFIG_PHSEG2_PRG_ON &
CAN_CONFIG_DBL_BUFFER_ON ) ;
我覺得是設定錯誤,用我的算法BaudRate 125K 時,
30F6010的SJW=4,BRP=19,PHSEG1=8,PHSEG2=8,PROPSEG=7,24Tq
18F4480的SJW=4,BRP=7 ,PHSEG1=8,PHSEG2=6,PROPSEG=5,20Tq
將這2個值帶入30F6010與18F4480後,完全無法接收資料,使用示波器觀察BaudRate 也不是125K。請問BaudRate要125時,
30F6010 Oscillator用7.5MHz 16倍頻,
CAN1SetOperationMode()及CAN1Initialize()
18F4480 Oscillator用 10MHz 4 倍頻,CANInitialize()要如何做最佳設定,是否還有其它原因造成上訴情況?

發表於: 2006/6/5 13:53
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