DP256 CAN Transmission | 68HC12 | EmbeddedRelated.com

Hi, Am a newbie to CAN. Am trying to implement a CAN driver on MC9S12DP256 micro eval board using metrowerks codewarrior. I have 2 problems 1. There are 5 CAN channels in DP256. How to select the required channel ?.(We are using CANE bit and MODRR registers, still not transmitting) 2. We observed that the "sync" bit in CAN1CTL0 is always zero. The target board is connected to the PC card for CAN communication. We are observing the signals at CAN transceiver input(from micro) pins using a oscilloscope. Am struck with this problem. Please help me out. Thanks Venki -------------------------------------------------- Venkat Dearborn Electronics India Bangalore - 560 041 Ph: 91-80-26345466 / 26632617 / 26340404 - Ext 207 Fax: 91-80-26534949 www.deindia.com <http://www.deindia.com> -------------------------------------------------- ---------------------------------------------------------------------- Email From ""venki" <venki@venk...>" was security checked by 3.93 version of CxProtect(tm) On: deiserver at: 19:51:42, 03-May-2005 Tuesday Engine: 4.110.21, sign.def:23-Mar-2005, sign2.def:23-Mar-2005, macro.def:18-Mar-2005 ---------------------------------------------------------------------- [Non-text portions of this message have been removed]

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Venki, the 5 CAN channels on the DP256 are all mapped to different memory and all the Tx,Rx pins are brought out to different pins so there should be no need to change anything. You can just write to each section of memory depending on which CAN channel you are talking to. I have posted a sample CAN program on this list in the past. If you can't find it send me an email and I'll send it to you directly. Steve Steven D. Letkeman BSc. President - Zanthic Technologies Inc. 403-526-8318 www.zanthic.com Embedded micro-controllers and CAN interfaces www.brightan.com Automated lighting systems ----- Original Message ----- From: venki To: 68HC12@68HC... Sent: Tuesday, May 03, 2005 8:11 AM Subject: [68HC12] DP256 CAN Transmission Hi, Am a newbie to CAN. Am trying to implement a CAN driver on MC9S12DP256 micro eval board using metrowerks codewarrior. I have 2 problems 1. There are 5 CAN channels in DP256. How to select the required channel ?.(We are using CANE bit and MODRR registers, still not transmitting) 2. We observed that the "sync" bit in CAN1CTL0 is always zero. The target board is connected to the PC card for CAN communication. We are observing the signals at CAN transceiver input(from micro) pins using a oscilloscope. Am struck with this problem. Please help me out. Thanks Venki -------------------------------------------------- Venkat Dearborn Electronics India Bangalore - 560 041 Ph: 91-80-26345466 / 26632617 / 26340404 - Ext 207 Fax: 91-80-26534949 www.deindia.com <http://www.deindia.com> -------------------------------------------------- ---------------------------------------------------------------------- Email From ""venki" <venki@venk...>" was security checked by 3.93 version of CxProtect(tm) On: deiserver at: 19:51:42, 03-May-2005 Tuesday Engine: 4.110.21, sign.def:23-Mar-2005, sign2.def:23-Mar-2005, macro.def:18-Mar-2005 ---------------------------------------------------------------------- [Non-text portions of this message have been removed] ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

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DP256 CAN Transmission - venki - May 3 10:11:00 2005

Re: DP256 CAN Transmission - Steve Letkeman - May 3 10:35:00 2005