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Re: 關於 CAN Baudrate 設定
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高級會員
 
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煩請有相關經驗的大大幫幫忙好嗎!? 我現在都可以傳送了!原來是線路上面 CAN-H 跟 CAN-L 這邊要跨接電組.但是我想請問SJW 是否設定越大"線"就可以越長呢!?
發表於: 2008/9/8 11:44
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關於 CAN Baudrate 設定
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高級會員
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不好意思~我看了AN754 來設定BaudRate,已經知道BaudRate是由幾個參數來設定的,
SJW , BRP , PHSEG1, PHSEG2, PROSEG, 這5個參數. 而設定的時候,條件是 1. PropSeg + PS1 ≥ PS2 2. PropSeg + PS1 ≥ tPROP 3. PS2 > SJW 我使用的Pic 是 18F2480 osc 是用內部的32M 以下是我的設定,但是到250k後之後的(包含250K),就無法傳送了,之前的都可以,想請問 我這樣設定有什麼問題呢? SJW 是否是越大越好呢? switch (BaudRate) { case 0: //10k {SJW=4;BRP=64;PHSEG1=8;PHSEG2=8;PROSEG=8;break;} case 1: //20k {SJW=4;BRP=32;PHSEG1=8;PHSEG2=8;PROSEG=8;break;} case 2: //50k {SJW=4;BRP=16;PHSEG1=7;PHSEG2=7;PROSEG=5;break;} case 3: //100k {SJW=4;BRP=8;PHSEG1=7;PHSEG2=7;PROSEG=5;break;} case 4: //125k {SJW=4;BRP=8;PHSEG1=5;PHSEG2=6;PROSEG=4;break;} case 5: //250k {SJW=4;BRP=4;PHSEG1=5;PHSEG2=6;PROSEG=4;break;} case 6: //500k {SJW=4;BRP=2;PHSEG1=5;PHSEG2=6;PROSEG=4;break;} case 7: //800k {SJW=4;BRP=1;PHSEG1=7;PHSEG2=7;PROSEG=5;break;} case 8: //1000k {SJW=4;BRP=1;PHSEG1=5;PHSEG2=6;PROSEG=4;break;} }
發表於: 2008/8/28 18:16
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